204 lines
6.9 KiB
Go
204 lines
6.9 KiB
Go
package main
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import (
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"crypto"
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"crypto/aes"
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"crypto/cipher"
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"crypto/ed25519"
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"encoding/hex"
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"fmt"
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"github.com/dchest/bcrypt_pbkdf"
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)
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// ssh-keygen -f /tmp/tmp2xzvpjhn -q -o -t ed25519 -N test -a 100
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// private
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/* on-disk format
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-----BEGIN OPENSSH PRIVATE KEY-----
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b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jdHIAAAAGYmNyeXB0AAAAGAAAABAZQzNZ6B
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eWtpsLgQvGbcuMAAAAZAAAAAEAAAAzAAAAC3NzaC1lZDI1NTE5AAAAIFjgZ791hHftK4GY
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uhnIN/1JdZqA17hIlNdKr+ljJ9bfAAAAoN0XZgxeA2SLXGZXqZi9TqeQHU7PERiJA9F0+p
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2NtNP4Y1Rey8C1EnF5mhzy8AZs6YJsE+xnQUSI/+Kbmi6MACQALaPO7CgtKwnfbFHuxzrD
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1EG83K08w2NE2txlQPqflQcFoVBIzcXNVFv+3A5DM7BBz0jLFi5CCwl2PEhMhcpElvV+LW
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PGXBV9IVdOeHm/hesRfuWTHcUalrqar1CmLWo=
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-----END OPENSSH PRIVATE KEY-----
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*/
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/* actual bytes (hex repr)
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00000000: 6f 70 65 6e 73 73 68 2d 6b 65 79 2d 76 31 00 00 openssh-key-v1..
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00000010: 00 00 0a 61 65 73 32 35 36 2d 63 74 72 00 00 00 ...aes256-ctr...
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00000020: 06 62 63 72 79 70 74 00 00 00 18 00 00 00 10 19 .bcrypt.........
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00000030: 43 33 59 e8 17 96 b6 9b 0b 81 0b c6 6d cb 8c 00 C3Y.........m...
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00000040: 00 00 64 00 00 00 01 00 00 00 33 00 00 00 0b 73 ..d.......3....s
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00000050: 73 68 2d 65 64 32 35 35 31 39 00 00 00 20 58 e0 sh-ed25519... X.
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00000060: 67 bf 75 84 77 ed 2b 81 98 ba 19 c8 37 fd 49 75 g.u.w.+.....7.Iu
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00000070: 9a 80 d7 b8 48 94 d7 4a af e9 63 27 d6 df 00 00 ....H..J..c'....
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00000080: 00 a0 dd 17 66 0c 5e 03 64 8b 5c 66 57 a9 98 bd ....f.^.d.\fW...
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00000090: 4e a7 90 1d 4e cf 11 18 89 03 d1 74 fa 9d 8d b4 N...N......t....
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000000a0: d3 f8 63 54 5e cb c0 b5 12 71 79 9a 1c f2 f0 06 ..cT^....qy.....
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000000b0: 6c e9 82 6c 13 ec 67 41 44 88 ff e2 9b 9a 2e 8c l..l..gAD.......
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000000c0: 00 24 00 2d a3 ce ec 28 2d 2b 09 df 6c 51 ee c7 .$.-...(-+..lQ..
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000000d0: 3a c3 d4 41 bc dc ad 3c c3 63 44 da dc 65 40 fa :..A...<.cD..e@.
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000000e0: 9f 95 07 05 a1 50 48 cd c5 cd 54 5b fe dc 0e 43 .....PH...T[...C
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000000f0: 33 b0 41 cf 48 cb 16 2e 42 0b 09 76 3c 48 4c 85 3.A.H...B..v<HL.
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00000100: ca 44 96 f5 7e 2d 63 c6 5c 15 7d 21 57 4e 78 79 .D..~-c.\.}!WNxy
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00000110: bf 85 eb 11 7e e5 93 1d c5 1a 96 ba 9a af 50 a6 ....~.........P.
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00000120: 2d 6a -j
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//
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6f70656e7373682d6b65792d763100 authmagic
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0000000a 10
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6165733235362d637472 "aes256-ctr"
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00000006 6
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626372797074 "bcrypt"
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00000018 24
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00000010 16
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19433359e81796b69b0b810bc66dcb8c salt
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00000064 100
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00000001 1
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00000033 51
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0000000b 11
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7373682d65643235353139 "ssh-ed25519"
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00000020 32
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58e067bf758477ed2b8198ba19c837fd49759a80d7b84894d74aafe96327d6df pubkey
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000000a0 160 length of encrypted private info
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dd17660c5e03648b5c6657a998bd4ea7 16*10 bytes (160 bytes)
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901d4ecf11188903d174fa9d8db4d3f8
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63545ecbc0b51271799a1cf2f0066ce9
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826c13ec67414488ffe29b9a2e8c0024
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002da3ceec282d2b09df6c51eec73ac3
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d441bcdcad3cc36344dadc6540fa9f95
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0705a15048cdc5cd545bfedc0e4333b0
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41cf48cb162e420b09763c484c85ca44
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96f57e2d63c65c157d21574e7879bf85
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eb117ee5931dc51a96ba9aaf50a62d6a
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*/
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// public
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/* on-disk format
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ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFjgZ791hHftK4GYuhnIN/1JdZqA17hIlNdKr+ljJ9bf bts@dawid.r00t.space
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*/
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/* actual bytes (hex repr)
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00000000: 00 00 00 0b 73 73 68 2d 65 64 32 35 35 31 39 00 ....ssh-ed25519.
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00000010: 00 00 20 58 e0 67 bf 75 84 77 ed 2b 81 98 ba 19 .. X.g.u.w.+....
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00000020: c8 37 fd 49 75 9a 80 d7 b8 48 94 d7 4a af e9 63 .7.Iu....H..J..c
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00000030: 27 d6 df '..
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//
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0000000b 11
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7373682d65643235353139 "ssh-ed25519"
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00000020 32
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58e067bf758477ed2b8198ba19c837fd49759a80d7b84894d74aafe96327d6df
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*/
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func main() {
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const (
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passphrase string = "test"
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rounds int = 100
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keySize int = 32
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lenPlain int = 160
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)
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var salt []byte
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var bcryptKey []byte
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var sk []byte
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var pk []byte
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var pubkey crypto.PublicKey
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var key ed25519.PrivateKey
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var decrypted []byte
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var aesCtx cipher.Block
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var encData []byte
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decrypted = make([]byte, lenPlain)
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encData = make([]byte, lenPlain)
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// Import salt
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if s, err := hex.DecodeString("19433359e81796b69b0b810bc66dcb8c"); err != nil {
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fmt.Println(err)
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return
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} else {
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salt = s
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}
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// Import encrypted data
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if b, err := hex.DecodeString("dd17660c5e03648b5c6657a998bd4ea7901d4ecf11188903d174fa9d8db4d3f863545ecbc0b51271799a1cf2f0066ce9826c13ec67414488ffe29b9a2e8c0024002da3ceec282d2b09df6c51eec73ac3d441bcdcad3cc36344dadc6540fa9f950705a15048cdc5cd545bfedc0e4333b041cf48cb162e420b09763c484c85ca4496f57e2d63c65c157d21574e7879bf85eb117ee5931dc51a96ba9aaf50a62d6a"); err != nil {
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fmt.Println(err)
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return
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} else {
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encData = b
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}
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// ED25519 keys
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// This is used to validate decrypted keys.
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if edk, err := hex.DecodeString("cceabbe370f139c3d3915018d8511e0663b62840d6b328426ac3df4e75ce6adf58e067bf758477ed2b8198ba19c837fd49759a80d7b84894d74aafe96327d6df"); err != nil {
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fmt.Println(err)
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return
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} else {
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key = edk
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// .Public() returns a crypto.PublicKey, which... is an interface that seemingly cannot be type asserted to anything.
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pubkey = key.Public()
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}
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sep := len(key) - ed25519.PublicKeySize
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pk = key[sep:]
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sk = key[0:sep]
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// Bcrypt_pbkdf2 derivation (used for deriving decryption key for AES encrypted private key)
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// if k, err := bcrypt_pbkdf.Key([]byte(passphrase), salt, rounds, keySize); err != nil {
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if k, err := bcrypt_pbkdf.Key([]byte(passphrase), salt, rounds, keySize+len(salt)); err != nil {
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fmt.Println(err)
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return
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} else {
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bcryptKey = k
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}
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realBcryptKey := bcryptKey[0:sep]
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realIV := bcryptKey[sep:]
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// Decrypter
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if a, err := aes.NewCipher(realBcryptKey); err != nil {
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fmt.Println(err)
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return
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} else {
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aesCtx = a
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}
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// Actual cipher setup. AES256-CBC
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// d := cipher.NewCBCDecrypter(aesCtx, realIV)
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// d.CryptBlocks(decrypted, encData)
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// Actual cipher setup. AES256-CTR
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d := cipher.NewCTR(aesCtx, realIV)
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d.XORKeyStream(decrypted, encData)
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/*
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if p, s, err := ed25519.GenerateKey(nil); err != nil {
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fmt.Println(err)
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return
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} else {
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pubkey = p
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key = s
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pk = key[(len(key) - ed25519.PublicKeySize):]
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sk = key[0:(len(key) - ed25519.PublicKeySize)]
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}
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*/
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fmt.Printf("ED25519 key: %v\n", hex.EncodeToString(key))
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fmt.Printf("Pubkey: %v\n", pubkey)
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fmt.Printf("SK: %v\n", hex.EncodeToString(sk))
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fmt.Printf("PK: %v\n", hex.EncodeToString(pk))
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fmt.Printf("Salt: %v\n", hex.EncodeToString(salt))
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fmt.Printf("Bcrypt Key: %v\n", hex.EncodeToString(bcryptKey))
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fmt.Printf("realBcryptKey: %v\n", hex.EncodeToString(realBcryptKey))
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fmt.Printf("realIV: %v\n", hex.EncodeToString(realIV))
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// fmt.Printf("Encrypted data: %v\n", hex.EncodeToString(encData))
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fmt.Printf("Decrypted data?: %v\n", hex.EncodeToString(decrypted))
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/* decrypted now correctly returns:
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54efc132 checksum
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54efc132 checksum matches!
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0000000b 11
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7373682d65643235353139 "ssh-ed25519"
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00000020 32
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58e067bf758477ed2b8198ba19c837fd49759a80d7b84894d74aafe96327d6df pubkey
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00000040 64
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cceabbe370f139c3d3915018d8511e0663b62840d6b328426ac3df4e75ce6adf58e067bf758477ed2b8198ba19c837fd49759a80d7b84894d74aafe96327d6df private key
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00000014 20
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6274734064617769642e723030742e7370616365 "bts@dawid.r00t.space"
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010203040506070809 (padding)
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*/
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}
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