Ejemplo n.º 1
0
        /// <summary>	Decrypts./ </summary>
        ///
        ///		auto secret = priv.get_shared_secret(pub);
        ///      auto nonce_plus_secret = fc::sha512::hash(fc::to_string(nonce) + secret.str());
        ///      auto plain_text = fc::aes_decrypt( nonce_plus_secret, message );
        ///      auto result = memo_message::deserialize(string(plain_text.begin(), plain_text.end()));
        ///      FC_ASSERT( result.checksum == uint32_t(digest_type::hash(result.text)._hash[0]) );
        ///      return result.text;
        ///
        /// <remarks>	Paul, 26/10/2015. </remarks>
        ///
        /// <param name="memo">				    The memo. </param>
        /// <param name="receiverPrivateKey">	The receiver private key. </param>
        /// <param name="senderPublicKey">      The sender public key. </param>
        ///
        /// <returns>	A string. </returns>
        static public string Decrypt(GrapheneMemo memo, KeyPair receiverKeyPair)
        {
            PublicKey pub = new BitsharesPubKey(memo.from).GetBitcoinPubKey();

            byte[] sharedSecret = GetSharedSecret(receiverKeyPair, pub);

            string ss = StringExtensions.ByteArrayToHexString(sharedSecret, true);

            string ps = memo.nonce.ToString() + StringExtensions.ByteArrayToHexString(Crypto.ComputeSha512(sharedSecret), true);

            byte[] seed = ASCIIEncoding.ASCII.GetBytes(ps);

            string hex = StringExtensions.ByteArrayToHexString(Crypto.ComputeSha512(seed), true);

            string key = hex.Substring(0, 64);
            string iv  = hex.Substring(64, 32);

            byte[] data = Util.HexStringToBytes(memo.message);

            int len = AES.AesDecrypt(data, Util.HexStringToBytes(key), Util.HexStringToBytes(iv));

            byte[] result = new byte[len - 4];
            Buffer.BlockCopy(data, 4, result, 0, result.Length);

            string message = UTF8Encoding.UTF8.GetString(result);

            return(message);
        }
Ejemplo n.º 2
0
        /// <summary>	Decrypts./ </summary>
        ///
        ///		auto secret = priv.get_shared_secret(pub);
        ///      auto nonce_plus_secret = fc::sha512::hash(fc::to_string(nonce) + secret.str());
        ///      auto plain_text = fc::aes_decrypt( nonce_plus_secret, message );
        ///      auto result = memo_message::deserialize(string(plain_text.begin(), plain_text.end()));
        ///      FC_ASSERT( result.checksum == uint32_t(digest_type::hash(result.text)._hash[0]) );
        ///      return result.text;
        /// 
        /// <remarks>	Paul, 26/10/2015. </remarks>
        ///
        /// <param name="memo">				 	The memo. </param>
        /// <param name="receiverPrivateKey">	The receiver private key. </param>
        /// <param name="senderPublicKey">   	The sender public key. </param>
        ///
        /// <returns>	A string. </returns>
        public static string Decrypt(GrapheneMemo memo, KeyPair receiverKeyPair)
        {
            PublicKey pub = new BitsharesPubKey(memo.from).GetBitcoinPubKey();
            byte[] sharedSecret = GetSharedSecret(receiverKeyPair, pub);

            string ss = StringExtensions.ByteArrayToHexString(sharedSecret, true);

            string ps = memo.nonce.ToString() + StringExtensions.ByteArrayToHexString(Crypto.ComputeSha512( sharedSecret), true);

            byte[] seed = ASCIIEncoding.ASCII.GetBytes(ps);

            string hex = StringExtensions.ByteArrayToHexString(Crypto.ComputeSha512(seed), true);

            string key = hex.Substring(0, 64);
            string iv = hex.Substring(64, 32);

            byte[] data = Util.HexStringToBytes(memo.message);

            int len = AES.AesDecrypt(data, Util.HexStringToBytes(key), Util.HexStringToBytes(iv));

            byte[] result = new byte[len - 4];
            Buffer.BlockCopy(data, 4, result, 0, result.Length);

            string message = UTF8Encoding.UTF8.GetString(result);

            return message;
        }