Dekrypcja tekstu zakodowanym kluczem

	public static String decrypt(String cipherText, PrivateKey privateKey,
			String encryptedKey) throws Exception {

		Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
		cipher.init(Cipher.PRIVATE_KEY, privateKey);
		byte[] decryptedKey = cipher.doFinal(Base64.getDecoder().decode(
				encryptedKey));

		// Convert bytes to AES SecretKey
		SecretKey originalKey = new SecretKeySpec(decryptedKey, 0,
				decryptedKey.length, "AES");

		Cipher aesCipher = Cipher.getInstance("AES");

		aesCipher.init(Cipher.DECRYPT_MODE, originalKey);

		byte[] bytes = Base64.getDecoder().decode(cipherText);

		return new String(aesCipher.doFinal(bytes), UTF_8);

	}

        public static string Decrypt(string encryptedMessage, RSACryptoServiceProvider privateKey, string encryptedKey)
        {
            var bytesEncryptedKey = Convert.FromBase64String(encryptedKey);
            var decryptedKeyData = privateKey.Decrypt(bytesEncryptedKey, false);
            //var str = System.Text.Encoding.Default.GetString(decryptedKeyData);
            //var result = Convert.ToBase64String(decryptedKeyData);
            using (MemoryStream mStream = new MemoryStream(decryptedKeyData))
            using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
            {
                using (CryptoStream cryptoStream = new CryptoStream(mStream,
                    aesProvider.CreateDecryptor(Key, IV), CryptoStreamMode.Read)) // nie mam skad wziac Key ani IV. Juz wiem ze robie cos zle :D
                {
                    cryptoStream.Read(decryptedKeyData , 0, decryptedKeyData .Length);
                }
                var plain = mStream.ToArray();
            }
            
            return result;
        }

int keySize = 16; // 16, 24 or 32 
string keyString = // > keySize 
int IvLength = 16;
UTF8Encoding encoder;
AesManaged aes;

encoder = new UTF8Encoding();
aes = new AesManaged { Key = encoder.GetBytes(keyString).Take(keySize).ToArray() };
aes.BlockSize = IvLength * 8; // 128-bit block size AES

// buffer, key = aes.Key, IV = vector
byte[] bytesDecrypted
using (ICryptoTransform decryptor = aes.CreateDecryptor(key, IV))
{
bytesDecrypted = decryptor.TransformFinalBlock(buffer, 0, buffer.Length);
}
result = encoder.GetString(bytesDecrypted, 0, bytesDecrypted.Length);

        public static string Decrypt(string encryptedMessage, RSACryptoServiceProvider privateKey, string encryptedKey)
        {
            var encoder = new UTF8Encoding();
            var bytesEncryptedKey = Convert.FromBase64String(encryptedKey);
            var decryptedKeyData = privateKey.Decrypt(bytesEncryptedKey, false);

            var aes = new AesManaged { Key = decryptedKeyData.Take(16).ToArray() };
            aes.BlockSize = 16 * 8; // 128-bit block size AES

            byte[] bytesDecrypted;
            var ecryptedMessageData = Convert.FromBase64String(encryptedMessage);
            using (ICryptoTransform decryptor = aes.CreateDecryptor())
            {
                bytesDecrypted = decryptor.TransformFinalBlock(ecryptedMessageData, 0, ecryptedMessageData.Length);
            }
            var result = encoder.GetString(bytesDecrypted, 0, bytesDecrypted.Length);

            return result;
        }

 rsaCryptoServiceProvider = (RSACryptoServiceProvider)certificate.PrivateKey;

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