//Decrypt a message.
func decryptMessage(key []byte, ciphertext *bytes.Buffer) (buf *bytes.Buffer) {
iv := doDigest(key)
aescrypt, aes_err := aes.NewCipher(key)
if aes_err != nil {
printerr(aes_err)
}
cipher := cipher.NewCBCDecrypter(aescrypt, iv)
out := bytes.NewBuffer(make([]byte, 512))
cipher.CryptBlocks(out.Bytes(), ciphertext.Bytes())
return out
}
func (self *AnyPortInterface) decrypt(req []byte) ([]byte, error) {
src := make([]byte, self.key_cipher.BlockSize()*4)
if _, err := base64.StdEncoding.Decode(src, req); err != nil {
return nil, err
}
dst := make([]byte, self.key_cipher.BlockSize()*2)
cipher := cipher.NewCBCDecrypter(self.key_cipher, AnyPortIV)
cipher.CryptBlocks(dst, src[:self.key_cipher.BlockSize()*2])
return bytes.TrimRight(dst, "\x00"), nil
}