128 lines
4.0 KiB
Go
128 lines
4.0 KiB
Go
package main
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import (
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`bytes`
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`crypto/cipher`
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`fmt`
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`log`
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`github.com/dchest/bcrypt_pbkdf`
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`golang.org/x/crypto/chacha20poly1305`
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)
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var (
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EncryptedBlob []byte = []byte{
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0x21, 0xca, 0x93, 0x7d, 0x6b, 0x81, 0x5c, 0x67,
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0x66, 0xc3, 0xd6, 0xa, 0xcc, 0x3a, 0xc7, 0x2d,
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0x7f, 0xf7, 0xae, 0x6a, 0x41, 0x85, 0x18, 0xad,
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0x37, 0x65, 0xfa, 0x8e, 0xb, 0x3b, 0x61, 0x72,
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0x70, 0xaa, 0xc5, 0x0, 0xf4, 0x43, 0xb8, 0x21,
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0xe6, 0x14, 0xe5, 0x7e, 0x81, 0x1f, 0x81, 0xe9,
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0x66, 0xa1, 0xd0, 0x44, 0x72, 0xca, 0xaf, 0xe7,
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0xbf, 0x6e, 0x95, 0x6f, 0xb3, 0x28, 0x3f, 0x92,
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0x8f, 0xc, 0x61, 0xc9, 0x39, 0x69, 0x1, 0xd5,
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0xe1, 0x43, 0x9b, 0xfe, 0x37, 0x7b, 0x4f, 0x9d,
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0xe0, 0x73, 0x33, 0x5c, 0xc9, 0x24, 0x7, 0x9c,
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0x5a, 0x96, 0x72, 0xb0, 0xe7, 0x36, 0x98, 0xc6,
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0xa, 0x63, 0x9b, 0xda, 0xf0, 0x4f, 0xa, 0x74,
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0xda, 0x77, 0xec, 0x8f, 0xc7, 0xdc, 0xe8, 0xa2,
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0x62, 0x5c, 0x19, 0x6b, 0x83, 0x41, 0xa4, 0x71,
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0x9f, 0x46, 0x78, 0x92, 0x64, 0x14, 0xc6, 0x63,
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0x41, 0x91, 0x4c, 0xe9, 0xc0, 0x9f, 0x4d, 0x33,
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0xb, 0x63, 0x1d, 0x96, 0x52, 0xa4, 0x68, 0x4a,
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0x4e, 0x13, 0xbd, 0xff, 0x64, 0x8a, 0xa7, 0xb6,
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}
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UnknownData []byte = []byte{
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0x9a, 0xa8, 0xaa, 0xa3,
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0x73, 0x64, 0xb3, 0xaa,
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0x78, 0x25, 0x23, 0x48,
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0x7e, 0x79, 0x57, 0xab,
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}
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CombinedEncrypted = append(EncryptedBlob, UnknownData...)
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// PLAIN
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PrivKey []byte = []byte{
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0xb9, 0x9a, 0xf2, 0xcb, 0x1e, 0xb3, 0x8c, 0xff,
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0xdf, 0x76, 0x31, 0x22, 0x72, 0x56, 0xda, 0xf,
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0xe3, 0xd1, 0xdb, 0x5a, 0xff, 0xea, 0x2e, 0x44,
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0xc8, 0x5, 0x8d, 0xcc, 0xe0, 0x21, 0xae, 0x7e,
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}
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PubKey []byte = []byte{
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0x9c, 0xf1, 0x14, 0x2f, 0xbb, 0x71, 0xac, 0xeb,
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0xf3, 0xae, 0xa8, 0xd8, 0x9c, 0x51, 0x8c, 0x3,
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0xa6, 0xd3, 0x66, 0x59, 0x4c, 0xee, 0xc5, 0x77,
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0x4c, 0x4f, 0xf4, 0x7d, 0x57, 0xba, 0x26, 0x75,
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}
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EdKey []byte = append(PrivKey, PubKey...)
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)
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func main() {
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var err error
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var c cipher.AEAD
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var kdfSalt []byte = []byte{
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0xfa, 0x99, 0x09, 0xfd,
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0xa2, 0xf5, 0xad, 0x42,
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0xd2, 0x8e, 0x21, 0xe3,
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0xb1, 0xcc, 0x6c, 0x94,
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}
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// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.chacha20poly1305
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// https://rus-cert.github.io/ssh-chacha20-poly1305-drafts/ssh-chacha20-poly1305@openssh.html
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// https://datatracker.ietf.org/doc/html/draft-josefsson-ssh-chacha20-poly1305-openssh-00
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// https://pkg.go.dev/golang.org/x/crypto/chacha20poly1305
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// var kdfKeyLen int = 512 / 8 // uses fixed 256 bits for chacha key, but it generates two keys...?
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// var kdfKeyLen int = 256 // uses fixed 256 bits for chacha key
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// var kdfKeyLen int = 32 // per golang pkg docs, 32 bytes (128 bits)...
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var kdfKeyLen int = 64 // but per OpenSSH, 64
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// var ivLen int = 0 // ??? per golang pkg docs, 12 bytes. per ssh package, though, 8(? or 0? seems to actually be 0). but needs 16 from...somewhere.
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var ivLen int = 16
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var kdfKey []byte
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var subkey1, subkey2 []byte
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var key []byte
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var iv []byte
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var nonce []byte
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var plain []byte
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if kdfKey, err = bcrypt_pbkdf.Key([]byte("testpassword"), kdfSalt, 16, kdfKeyLen+ivLen); err != nil {
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log.Panicln(err)
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}
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key = kdfKey[0:kdfKeyLen]
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iv = kdfKey[kdfKeyLen:(kdfKeyLen + ivLen)]
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subkey1 = kdfKey[0:32]
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subkey2 = kdfKey[32:]
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// iv = subkey2[0:12]
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nonce = []byte{
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0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0,
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}
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fmt.Printf("kdf key (%d bytes): %#v\n", len(key), key)
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fmt.Printf("kdf iv (%d bytes): %#v\n\n", len(iv), iv)
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// if c, err = chacha20poly1305.New(key); err != nil {
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if c, err = chacha20poly1305.New(subkey1); err != nil {
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// if c, err = chacha20poly1305.New(subkey2); err != nil {
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log.Panicln(err)
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}
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fmt.Printf("nonce size: %d\n", c.NonceSize())
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plain = make([]byte, len(EncryptedBlob))
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// if plain, err = c.Open(plain, iv, EncryptedBlob, UnknownData); err != nil {
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// if plain, err = c.Open(plain, iv, CombinedEncrypted, nil); err != nil {
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if plain, err = c.Open(plain, nonce, EncryptedBlob, nil); err != nil {
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log.Panicln(err)
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}
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// fmt.Printf("%#v\n", c)
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fmt.Printf("Decrypted:\n%#v\n", plain)
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if bytes.Compare(plain, EdKey) != 0 {
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fmt.Printf("\nOriginal:\n%#v\n", EdKey)
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}
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_ = subkey1
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_ = subkey2
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}
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