以前に暗号化されたデータの復号化に問題があります。トリプルデス効果を得るために、3つの異なるキーで順次暗号化-復号化-暗号化を使用しています。暗号化関数は正常に動作しますが (8 バイトの配列を返します)、復号化関数は空の配列を返します。
public static byte[] EncryptDES(byte[] clearData, byte[] key)
{
DES desEncrypt = new DESCryptoServiceProvider();
desEncrypt.Mode = CipherMode.ECB;
desEncrypt.Key = key;
ICryptoTransform transForm = desEncrypt.CreateEncryptor();
MemoryStream encryptedStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(encryptedStream, transForm, CryptoStreamMode.Write);
cryptoStream.Write(clearData, 0, clearData.Length);
byte [] encryptedData = encryptedStream.ToArray();
return encryptedData;
}
public static byte[] DecryptDES(byte[] clearData, byte[] key)
{
DES desDecrypt = new DESCryptoServiceProvider();
desDecrypt.Mode = CipherMode.ECB;
desDecrypt.Key = key;
ICryptoTransform transForm = desDecrypt.CreateDecryptor();
MemoryStream decryptedStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(decryptedStream, transForm, CryptoStreamMode.Write);
cryptoStream.Write(clearData, 0, clearData.Length);
byte[] encryptedData = decryptedStream.ToArray();
return encryptedData;
}
public static byte[] Encrypt3DES(byte[] clearData, byte[] key0, byte[] key1, byte[] key2)
{
byte[] encryptedData1 = new byte[clearData.Length];
byte[] encryptedData2 = new byte[clearData.Length];
byte[] encryptedData3 = new byte[clearData.Length];
encryptedData1 = DESCrypto.EncryptDES(clearData , key0);
encryptedData2 = DESCrypto.DecryptDES(encryptedData1, key1);
encryptedData3 = DESCrypto.EncryptDES(encryptedData2, key2);
return encryptedData3;
}
私は何を間違っていますか?