stubbed out cipher funcs

TODO

@@ -4,3 +4,8 @@
 --- ssh-rsa (sha1), rsa-sha2-256, rsa-sha2-512 (new default)
 - ciphers:
 -- 3des-cbc, aes128-cbc, aes192-cbc, aes256-cbc, aes128-ctr, aes192-ctr, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com, chacha20-poly1305@openssh.com
+
+provide marshal, unmarshal for keytypes/* keys.
+https://golangexample.com/encode-and-decode-binary-message-and-file-formats-in-go/ (?)
+
+create separate package, go_sshdh

_ref/KEY_GUIDE.html

@@ -734,7 +734,7 @@ pre.rouge {
 <h1>OpenSSH Key Structure Guide</h1>
 <div class="details">
 <span id="author" class="author">brent saner &lt;bts@square-r00t.net&gt;, https://r00t2.io</span><br>
-<span id="revdate">Last updated 2022-04-25 04:27:24 -0400</span>
+<span id="revdate">Last updated 2022-04-28 05:18:26 -0400</span>
 </div>
 <div id="toc" class="toc2">
 <div id="toctitle">Table of Contents</div>

cipher/aes/aes128/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes128/cbc/types.go

@@ -0,0 +1,18 @@
+package cbc
+
+import (
+	`crypto/cipher`
+)
+
+// Cipher is an AES128-CBC cipher.Cipher.
+type Cipher struct {
+	// key contains the encryption key.
+	key []byte
+	// iv contains the IV, or initialization vector.
+	iv []byte
+	/*
+		cryptBlock contains the block encryptor.
+		CBC is a block (all at once) encryption mode.
+	*/
+	cryptBlock cipher.Block
+}

cipher/aes/aes128/consts.go

@@ -1,10 +1,10 @@
 package aes128
 
 import (
-	`r00t2.io/sshkeys/cipher/aes`
+	sshAES `r00t2.io/sshkeys/cipher/aes`
 )
 
 const (
 	KeySize    int = 16 // in bytes; AES128 is so named for its 128-bit key, thus: 128 / 8 = 16
-	KdfKeySize int = KeySize + aes.IvSize
+	KdfKeySize int = KeySize + sshAES.IvSize
 )

cipher/aes/aes128/ctr/funcs.go

@@ -0,0 +1,205 @@
+package ctr
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes128/gcm/funcs.go

@@ -0,0 +1,205 @@
+package gcm
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes192/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes192/ctr/funcs.go

@@ -0,0 +1,205 @@
+package ctr
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes192/gcm/funcs.go

@@ -0,0 +1,205 @@
+package gcm
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes256/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes256/ctr/funcs.go

@@ -0,0 +1,205 @@
+package ctr
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes256/gcm/funcs.go

@@ -0,0 +1,205 @@
+package gcm
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/chacha20/poly1305/funcs.go

@@ -0,0 +1,205 @@
+package poly1305
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/null/funcs.go

@@ -0,0 +1,205 @@
+package null
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/tripledes/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/types.go

@@ -5,6 +5,8 @@ import (
 )
 
 type Cipher interface {
+	// Setup initializes the Cipher with a given key.
+	Setup(key []byte) (err error)
 	// Name returns the string form of the cipher name.
 	Name() (name string)
 	// NameBytes returns the Name result but in bytes, with a leading uint32 bytecount packed in.
@@ -13,8 +15,6 @@ type Cipher interface {
 	BlockSize() (size int)
 	// KdfKeySize returns the desired/needed key size for use with kdf.KDF.
 	KdfKeySize() (size int)
-	// Setup initializes the Cipher with a given key.
-	Setup(key []byte) (err error)
 	/*
 		Encrypt takes plain data, either a:
 			- string
@@ -26,6 +26,16 @@ type Cipher interface {
 	Encrypt(data interface{}) (encrypted *bytes.Reader, err error)
 	// AllocateEncrypt is exactly like cipher.Cipher.Encrypt except that it includes a (NON-encrypted) uint32 prefix of byte allocation.
 	AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error)
+	/*
+		Pad returns padded bytes in a *bytes.Buffer according to the cipher's padding specification.
+		data can be one of either:
+			- string
+			- raw byte slice ([]byte or []uint8)
+			- single byte (byte or uint8)
+			- *bytes.Buffer
+		This is a prerequisite in some ciphers, and must be performed BEFORE encrypting.
+	*/
+	Pad(data interface{}) (paddedBuf *bytes.Reader, err error)
 	/*
 		Decrypt takes encrypted data, either a:
 			- raw byte slice ([]byte or []uint8)
@@ -37,14 +47,4 @@ type Cipher interface {
 	AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error)
 	// IsPlain returns true if this is a "null" cipher; i.e. no encryption is actually performed.
 	IsPlain() (plain bool)
-	/*
-		Pad returns padded bytes in a *bytes.Buffer according to the cipher's padding specification.
-		data can be one of either:
-			- string
-			- raw byte slice ([]byte or []uint8)
-			- single byte (byte or uint8)
-			- *bytes.Buffer
-		This is a prerequisite in some ciphers, and must be performed BEFORE encrypting.
-	*/
-	Pad(data interface{}) (paddedBuf *bytes.Reader, err error)
 }

errs/errs.go

@@ -0,0 +1,9 @@
+package errs
+
+import (
+	"errors"
+)
+
+var (
+	ErrBadData = errors.New("unable to serialize/cast data into buffer; unknown or invalid data object")
+)

internal/utils.go

@@ -3,18 +3,15 @@ package internal
 import (
 	"bytes"
 	"encoding/binary"
+	`io`
+
+	`r00t2.io/sshkeys/errs`
 )
 
 /*
 	ReadSizeBytes returns a uint32 allocator for a given set of data for preparation of packing into bytes.
 
-	data can be one of:
-
-		- string
-		- byte/uint8
-		- []byte/[]uint8
-		- *bytes.Buffer
-		- *bytes.Reader
+	See SerializeData for valid types for data.
 
 	If pack is true, the original data will be appended to the returned allocated *bytes.Reader.
 
@@ -26,41 +23,150 @@ func ReadSizeBytes(data interface{}, pack bool) (allocated *bytes.Reader, err er
 	var b []byte
 	var sizer = make([]byte, 4)
 
-	switch t := data.(type) {
-	case string:
-		b = []byte(t)
-	case byte:
-		// b = []byte{0x0, 0x0, 0x0, 0x1}
-		b = []byte{t}
-	case []byte:
-		b = t
-	case bytes.Buffer:
-		t2 := &t
-		b = t2.Bytes()
-	case *bytes.Buffer:
-		b = t.Bytes()
-	case bytes.Reader:
-		t2 := &t
-		b = make([]byte, t2.Len())
-		if _, err = t2.Read(b); err != nil {
-			return
-		}
-	case *bytes.Reader:
-		b = make([]byte, t.Len())
-		if _, err = t.Read(b); err != nil {
-			return
-		}
+	if b, err = SerializeData(data); err != nil {
+		return
 	}
 
 	u = uint32(len(b))
 
-	binary.BigEndian.PutUint32(sizer, u)
 	if !pack {
+		binary.BigEndian.PutUint32(sizer, u)
 		allocated = bytes.NewReader(sizer)
 	} else {
-		b = append(sizer, b...)
+		if b, err = PackBytes(b); err != nil {
+			return
+		}
 		allocated = bytes.NewReader(b)
 	}
 
 	return
 }
+
+/*
+	PackBytes prefixes data with an allocator.
+
+	See SerializeData for valid types for data.
+
+	NOTE: If data is a *bytes.Reader, the bytes WILL be consumed within that reader.
+*/
+func PackBytes(data interface{}) (b []byte, err error) {
+
+	var dataBytes []byte
+	var size uint32
+
+	if dataBytes, err = SerializeData(data); err != nil {
+		return
+	}
+
+	size = uint32(len(dataBytes))
+
+	b = make([]byte, size)
+	binary.BigEndian.PutUint32(b, size)
+	b = append(b, dataBytes...)
+
+	return
+}
+
+/*
+	UnpackBytes performs the opposite of PackBytes, reading an allocator and then reading ONLY the remaining bytes.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func UnpackBytes(data interface{}) (unpacked []byte, err error) {
+
+	var sizeBytes []byte = make([]byte, 4)
+	var u uint32
+
+	// We can't use SerializeData because it'll consume the entire data set. We don't want that.
+	switch t := data.(type) {
+	case []byte:
+		sizeBytes = t[:4]
+		u = binary.BigEndian.Uint32(sizeBytes)
+		unpacked = t[4:u]
+	case *bytes.Buffer:
+		sizeBytes = t.Next(4)
+		u = binary.BigEndian.Uint32(sizeBytes)
+		unpacked = t.Next(int(u))
+	case bytes.Buffer:
+		t2 := &t
+		sizeBytes = t2.Next(4)
+		u = binary.BigEndian.Uint32(sizeBytes)
+		unpacked = t2.Next(int(u))
+	case *bytes.Reader:
+		if _, err = t.Read(sizeBytes); err != nil {
+			return
+		}
+		u = binary.BigEndian.Uint32(sizeBytes)
+		unpacked = make([]byte, u)
+		if _, err = io.ReadFull(t, unpacked); err != nil {
+			return
+		}
+	case bytes.Reader:
+		t2 := &t
+		if _, err = t2.Read(sizeBytes); err != nil {
+			return
+		}
+		u = binary.BigEndian.Uint32(sizeBytes)
+		unpacked = make([]byte, u)
+		if _, err = io.ReadFull(t2, unpacked); err != nil {
+			return
+		}
+	default:
+		err = errs.ErrBadData
+		return
+	}
+
+	return
+}
+
+/*
+	SerializeData transforms one of the following types:
+
+		- string
+		- []byte
+		- byte
+		- bytes.Buffer
+		- *bytes.Buffer
+		- bytes.Reader
+		- *bytes.Reader
+
+	into a []byte.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func SerializeData(data interface{}) (b []byte, err error) {
+
+	switch t := data.(type) {
+	case string:
+		b = []byte(t)
+	case byte:
+		b = []byte{t}
+	case []byte:
+		b = t
+	case *bytes.Buffer:
+		b = t.Bytes()
+	case bytes.Buffer:
+		t2 := &t
+		b = t2.Bytes()
+	case *bytes.Reader:
+		b = make([]byte, t.Len())
+		if b, err = io.ReadAll(t); err != nil {
+			return
+		}
+	case bytes.Reader:
+		t2 := &t
+		b = make([]byte, t2.Len())
+		if b, err = io.ReadAll(t2); err != nil {
+			return
+		}
+	default:
+		err = errs.ErrBadData
+		return
+	}
+
+	return
+}

keytypes/ed25519/types.go

@@ -3,13 +3,14 @@ package ed25519
 import (
 	`crypto/ed25519`
 
+	`r00t2.io/sshkeys/cipher`
 	`r00t2.io/sshkeys/kdf`
 )
 
 // Key is an ed25519 OpenSSH key.
 type Key struct {
 	KeyPairs []*Keypair `xml:"keypairs" json:"keypairs" yaml:"Keypairs"`
-	Cipher   string     // TODO: (sshkeys/cipher).Cipher
+	Cipher   cipher.Cipher
 	KDF      kdf.KDF
 }
 

keytypes/types.go

@@ -0,0 +1,9 @@
+package keytypes
+
+// Key contains at least one keytypes.KeyPair, a cipher.Cipher, and a kdf.KDF.
+type Key interface {
+}
+
+// KeyPair contains a private key component, public key component, and comment.
+type KeyPair interface {
+}