ecc.py 文件源码

def decrypt(self, data, ciphername='aes-256-cbc'):
        """
        Decrypt data with ECIES method using the local private key
        """
        blocksize = OpenSSL.get_cipher(ciphername).get_blocksize()
        iv = data[:blocksize]
        i = blocksize
        curve, pubkey_x, pubkey_y, i2 = ECC._decode_pubkey(data[i:])
        i += i2
        ciphertext = data[i:len(data)-32]
        i += len(ciphertext)
        mac = data[i:]
        key = sha512(self.raw_get_ecdh_key(pubkey_x, pubkey_y)).digest()
        key_e, key_m = key[:32], key[32:]
        if not equals(hmac_sha256(key_m, data[:len(data) - 32]), mac):
            raise RuntimeError("Fail to verify data")
        ctx = Cipher(key_e, iv, 0, ciphername)
        return ctx.ciphering(ciphertext)