go_sshkeys/cipher/types.go

package cipher

import (
	`bytes`
)

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.
	NameBytes() (name []byte)
	// BlockSize returns the blocksize of the cipher.Cipher. This is used for externally padding data for Cipher.Encrypt and Cipher.AllocateEncrypt.
	BlockSize() (size int)
	// KdfKeySize returns the desired/needed key size for use with kdf.KDF.
	KdfKeySize() (size int)
	/*
		Encrypt takes plain data, either a:
			- string
			- raw byte slice ([]byte or []uint8)
			- single byte (byte or uint8)
			- *bytes.Buffer
		and returns an encrypted *bytes.Buffer of data.
	*/
	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)
			- *bytes.Buffer
		and returns a plain/decrypted *bytes.Buffer of data.
	*/
	Decrypt(data interface{}) (decrypted *bytes.Reader, err error)
	// AllocatedDecrypt is exactly like cipher.Cipher.Decrypt except that it assumes that data includes a (NON-encrypted) uint32 prefix of byte allocation.
	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)
}