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package cred
import (
"crypto/cipher"
"golang.org/x/crypto/blowfish"
)
func blowfishChecksizeAndPad(padded []byte) []byte {
modulus := len(padded) % blowfish.BlockSize
if modulus != 0 {
padlen := blowfish.BlockSize - modulus
for i := 0; i < padlen; i++ {
padded = append(padded, 0)
}
}
return padded
}
type blowfishCipher struct {
cipher *blowfish.Cipher
}
func (b *blowfishCipher) Encrypt(source []byte) []byte {
paddedSource := blowfishChecksizeAndPad(source)
ciphertext := make([]byte, blowfish.BlockSize+len(paddedSource))
eiv := ciphertext[:blowfish.BlockSize]
encodedBlackEncryptor := cipher.NewCBCEncrypter(b.cipher, eiv)
encodedBlackEncryptor.CryptBlocks(ciphertext[blowfish.BlockSize:], paddedSource)
return ciphertext
}
func (b *blowfishCipher) Decrypt(encrypted []byte) []byte {
div := encrypted[:blowfish.BlockSize]
decrypted := encrypted[blowfish.BlockSize:]
if len(decrypted)%blowfish.BlockSize != 0 {
panic("decrypted is not a multiple of blowfish.BlockSize")
}
dcbc := cipher.NewCBCDecrypter(b.cipher, div)
dcbc.CryptBlocks(decrypted, decrypted)
var result = make([]byte, 0)
for _, b := range decrypted {
if b == 0x0 {
break
}
result = append(result, b)
}
return result
}
func NewBlowfishCipher(key []byte) (Cipher, error) {
var passwordCipher, err = blowfish.NewCipher(key)
if err != nil {
return nil, err
}
return &blowfishCipher{
cipher: passwordCipher,
}, nil
}
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