java - 如何在.NET 中使用 DES 算法？

Question

如何在 .NET 中使用 DES？

这是我在 Java 中的做法:

        public static String decrypt(byte[] pin, byte [] desKeyData ) throws Exception {
    //if (ISOConstantsLibrary.DEBUG) System.out.println("original: " + pin + " key: " + ISOUtil.bcd2str(desKeyData, 0, 2 * desKeyData.length, false) );
    String out = "";

    try {           
        SecretKeySpec desKey = new SecretKeySpec(desKeyData, "DES");
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");//DES/CBC/PKCS5Padding
        byte[] encrypted_password = pin;
        cipher.init(Cipher.DECRYPT_MODE, desKey);
        byte[] decrypted_password = cipher.doFinal(encrypted_password);
        out = new String(decrypted_password);
        //if (ISOConstantsLibrary.DEBUG) System.out.println("Decrypted Password " + out);
    }
    catch (Exception e) {
        e.printStackTrace();
    }

    return out;
}

是否有用于解密 .NET 中 DES 加密的库？如果可以，我该如何使用它？

Answer 1

假设您的输入是一个流

using System.Security.Cryptography

string key;
Stream input;
string output;
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
//Set key and initialization vector for DES algorithm
DES.Key = ASCIIEncoding.ASCII.GetBytes(key);
DES.IV = ASCIIEncoding.ASCII.GetBytes(key);

//Create CryptoStream layer to decrypt input on reading
CryptoStream decryptStream = new CryptoStream(input, DES.CreateDecryptor(), CryptoStreamMode.Read);
//return decrypted
return new StreamReader(decryptStream ).ReadToEnd();

否则你当然可以轻松地将输入写入流中。对于 ECB 模式，您还需要将 DES 对象的模式设置为 ECB:

DES.Mode = CipherMode.ECB