Exemplo n.º 1
0
        public ArgonAesEncryptionProvider(string passphrase, string salt, EncryptionMethod method, EncryptionOptions options = null)
        {
            Guard.AgainstNull(passphrase, nameof(passphrase));
            Guard.AgainstNull(salt, nameof(salt));

            _method       = method;
            _options      = options;
            _argonHashKey = ArgonHash.GetHashKeyAsync(passphrase, salt, Encryption.Constants.Aes256.KeySize, _options?.HashOptions).GetAwaiter().GetResult();
        }
Exemplo n.º 2
0
        public static byte[] Aes256Decrypt(ReadOnlyMemory <byte> encryptedData, ReadOnlyMemory <byte> key, EncryptionOptions options = null)
        {
            if (key.Length != Constants.Aes256.KeySize || encryptedData.Length == 0)
            {
                return(null);
            }

            using var cipherStream = new MemoryStream(encryptedData.ToArray());
            using var cipherReader = new BinaryReader(cipherStream);

            var nonce = cipherReader.ReadBytes(options?.NonceSize ?? Constants.Aes256.NonceSize);

            var cipher     = new GcmBlockCipher(new AesEngine());
            var parameters = new AeadParameters(new KeyParameter(key.ToArray()), options?.MacBitSize ?? Constants.Aes256.MacBitSize, nonce);

            cipher.Init(false, parameters);

            var cipherText = cipherReader.ReadBytes(encryptedData.Length - nonce.Length);
            var plainText  = new byte[cipher.GetOutputSize(cipherText.Length)];

            try
            { cipher.DoFinal(plainText, cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0)); }
            catch (InvalidCipherTextException)
            { return(null); }

            return(plainText);
        }
Exemplo n.º 3
0
        public static byte[] Aes256Encrypt(ReadOnlyMemory <byte> data, ReadOnlyMemory <byte> key, EncryptionOptions options = null)
        {
            if (key.Length != Constants.Aes256.KeySize || data.Length == 0)
            {
                return(null);
            }

            var nonce = new byte[options?.NonceSize ?? Constants.Aes256.NonceSize];

            Random.NextBytes(nonce);

            var cipher = new GcmBlockCipher(new AesEngine());

            cipher.Init(true, new AeadParameters(new KeyParameter(key.ToArray()), options?.MacBitSize ?? Constants.Aes256.MacBitSize, nonce));

            var cipherText = new byte[cipher.GetOutputSize(data.Length)];

            cipher.DoFinal(cipherText, cipher.ProcessBytes(data.ToArray(), 0, data.Length, cipherText, 0));

            using var cs = new MemoryStream();
            using (var bw = new BinaryWriter(cs))
            {
                bw.Write(nonce);
                bw.Write(cipherText);
            }

            return(cs.ToArray());
        }
Exemplo n.º 4
0
 public static byte[] Decrypt(ReadOnlyMemory <byte> data, EncryptionMethod method, ReadOnlyMemory <byte> hashKey, EncryptionOptions options = null)
 {
     GuardAgainstBadHashKey(method, hashKey);
     return(method switch
     {
         EncryptionMethod.AES256_ARGON2ID => AesEncrypt.Aes256Decrypt(data, hashKey, options),
         _ => AesEncrypt.Aes256Decrypt(data, hashKey)
     });