Question

此代码块用于同时拥有密钥和iv集，取自C# Encryption to PHP Decryption

我试图将其更改为使用生成的iv，该iv会添加到结果输出中。加密工作正常（测试解密是通过php完成的，效果很好）但是我无法使用C＃加密文本与C＃decrypt函数获得相同的结果。任何人都可以指出我忽略的东西吗？

我看到的错误是Bad PKCS7填充。长度x无效，其中x变化。

private static readonly byte[] Key = Convert.FromBase64String("REMOVED");
private const int IvBytes = 32;

public static string Encrypt(string prm_text_to_encrypt)
{
    var sToEncrypt = prm_text_to_encrypt;

    var rj = new RijndaelManaged()
    {
        Padding = PaddingMode.PKCS7,
        Mode = CipherMode.CBC,
        KeySize = 256,
        BlockSize = 256,
        Key = Key,
    };
    rj.GenerateIV ();

    var encryptor = rj.CreateEncryptor();

    var msEncrypt = new MemoryStream();
    var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);

    var toEncrypt = Encoding.ASCII.GetBytes(sToEncrypt);

    csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
    csEncrypt.FlushFinalBlock();

    var encrypted = msEncrypt.ToArray();

    return (Convert.ToBase64String(rj.IV.Concat(encrypted).ToArray()));
}

public static string Decrypt(string prm_text_to_decrypt)
{

    var sEncryptedString = prm_text_to_decrypt;

    var rj = new RijndaelManaged()
    {
        Padding = PaddingMode.PKCS7,
        Mode = CipherMode.CBC,
        KeySize = 256,
        BlockSize = 256,
        Key = Key
    };

    var decryptor = rj.CreateDecryptor();

    var tmp = Convert.FromBase64String(sEncryptedString);

    var fromEncrypt = new byte[tmp.Length];

    byte[] IV = tmp.Take(IvBytes).ToArray();
    byte[] sEncrypted = tmp.Skip(IvBytes).ToArray();
    rj.IV = IV;

    var msDecrypt = new MemoryStream(sEncrypted);
    var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);

    csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);

    return (Encoding.ASCII.GetString(fromEncrypt));
}

更改代码生成随机iv后，C＃Rijndael解密不再有效

0 个答案: