在Oracle和.Net之间使用AES进行加密/解密

Question

经过反复试验，我终于找到了在两端都可以使用的互补加密代码（在Oracle中加密，在.Net中解密）。代码如下。但是，它适用于最多15个字符的字符串。加密较大的字符串时，我得到的结果完全不同。有谁知道我如何修改以下内容才能不管字符串大小如何？

这是Oracle / PLSQL函数：

CREATE OR REPLACE FUNCTION Encrypt_Val(p_txt IN VARCHAR2, p_key IN VARCHAR2, p_iv IN VARCHAR2 := NULL)
      RETURN RAW
   IS
      raw_txt RAW(4000);
      raw_key RAW(4000);
      raw_iv RAW(4000);

   BEGIN

      raw_txt := UTL_I18N.STRING_TO_RAW(data => p_txt, dst_charset => 'AL32UTF8');
      raw_key := UTL_I18N.STRING_TO_RAW(data => p_key, dst_charset => 'AL32UTF8');
      raw_iv := UTL_I18N.STRING_TO_RAW(p_iv, 'AL32UTF8');

      RETURN DBMS_CRYPTO.encrypt(src => raw_txt, 
                                        key => raw_key, 
                                        typ => (DBMS_CRYPTO.ENCRYPT_AES256 
                                                + DBMS_CRYPTO.chain_cbc 
                                                + DBMS_CRYPTO.pad_pkcs5));

   END ;

这是.Net代码：

public static class Encryption
{
    public static string EncryptAES(string text, string key, string iv)
    {
        byte[] inputBytes = Encoding.UTF8.GetBytes(text);
        byte[] keyBytes = Encoding.UTF8.GetBytes(key);
        byte[] ivBytes = Encoding.UTF8.GetBytes(iv);

        using (var aesEncryption = AESCryptoProvider(keyBytes, ivBytes))
        {
            // Convert string to byte array                
            byte[] dest = new byte[inputBytes.Length];

            // encryption
            using (ICryptoTransform encrypt = aesEncryption.CreateEncryptor(aesEncryption.Key, aesEncryption.IV))
            {
                dest = encrypt.TransformFinalBlock(inputBytes, 0, inputBytes.Length);

                encrypt.Dispose();
            }

            return BitConverter.ToString(dest).Replace("-", "");
        }
    }

    public static string DecryptAES(string encryptedText, string key, string iv)
    {
        byte[] cypherText = StringToByteArray(encryptedText);
        byte[] keyBytes = Encoding.UTF8.GetBytes(key);
        byte[] ivBytes = Encoding.UTF8.GetBytes(iv);

        using (var aesDecryption = AESCryptoProvider(keyBytes, ivBytes))
        {
            // Convert string to byte array                
            byte[] dest = new byte[cypherText.Length];

            // encryption
            using (ICryptoTransform decrypt = aesDecryption.CreateDecryptor(aesDecryption.Key, aesDecryption.IV))
            {
                dest = decrypt.TransformFinalBlock(cypherText, 0, cypherText.Length);

                decrypt.Dispose();
            }

            // Convert byte array to UTF8 string
            return Encoding.UTF8.GetString(dest); ;
        }
    }

    private static AesCryptoServiceProvider AESCryptoProvider(byte[] privateKeyByte, byte[] sharedIVKeyByte)
    {
        var aesProvider = new AesCryptoServiceProvider()
        {
            BlockSize = 128,
            KeySize = 128,
            IV = sharedIVKeyByte,
            Key = privateKeyByte,
            Mode = CipherMode.ECB,
            Padding = PaddingMode.PKCS7
        };

        return aesProvider;
    }

    private static byte[] StringToByteArray(string hex)
    {
        return Enumerable.Range(0, hex.Length).Where(x => x % 2 == 0).Select(x => Convert.ToByte(hex.Substring(x, 2), 16)).ToArray();
    }
}

从控制台调用.Net函数的代码：

private static void Main(string[] args)
    {
        string text = "Testing123";
        string key = "12345678901234567890123456789012";
        string iv = "26744a68b53dd87a";

        string encryptedText = Encryption.EncryptAES(text, key, iv);
        System.Console.WriteLine(".Net AES Encryption Result: '{0}'", encryptedText);

        string decryptedText = Encryption.DecryptAES(encryptedText, key, iv);
        System.Console.WriteLine(".Net AES Decryption Result: '{0}'", decryptedText);
    }

在两端加密字符串 Testing123 （10个字符）时，我得到的结果是相同的：

• Oracle：CDCD0BC870ACCE1F396BD334EA203EBA
• .Net：CDCD0BC870ACCE1F396BD334EA203EBA

但是，如果我尝试加密 Testing123456789 （16个字符）：

• Oracle：3FB6A3DEEEE95CC43315DA2A6BAC12A5D7F3645C9E32CD7475C09F9B2AA51FB4
• .Net：3FB6A3DEEEE95CC43315DA2A6BAC12A54198AB4081487C213A1C82BC404AD7C8

有人知道如何解决此问题吗？