Question

我在解密和加密字符串时遇到错误：

5duOH + Tlg5deIrWZiHoNaQ == wVxXSl9pFu6A8h14 / nLdyBkDzO4xmec7PQ0cB7MHjCDqhSRum3C7I1OfqL1rEWbNonU / ayCaJS18zV7ivQQU7A == MBJzKMrrrbmc2 / vBZSPDkQ == I09Kj25UO + LcmRzgoqTT2g == + Fkm9VCGplEK6eEyHyEtuEodKSbckC07M2FShu2ukCg =

错误如下：

输入不是有效的Base-64字符串，因为它包含非基本64个字符，两个以上的填充字符或填充字符中的非法字符。

我的加密代码是： public string EncryptQueryString（string inputText，string key，string salt） { byte [] plainText = Encoding.UTF8.GetBytes（inputText）;

    using (RijndaelManaged rijndaelCipher = new RijndaelManaged())
    {
        PasswordDeriveBytes secretKey = new PasswordDeriveBytes(Encoding.ASCII.GetBytes(key), Encoding.ASCII.GetBytes(salt));
        using (ICryptoTransform encryptor = rijndaelCipher.CreateEncryptor(secretKey.GetBytes(32), secretKey.GetBytes(16)))
        using (MemoryStream memoryStream = new MemoryStream())
        using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
        {
            cryptoStream.Write(plainText, 0, plainText.Length);
            cryptoStream.FlushFinalBlock();
            string base64 = Convert.ToBase64String(memoryStream.ToArray());

            // Generate a string that won't get screwed up when passed as a query string.
            string urlEncoded = HttpUtility.UrlEncode(base64);
            return urlEncoded;
        }
    }
}

解密：

public string DecryptQueryString(string inputText, string key, string salt)
{
    byte[] encryptedData = Convert.FromBase64String(inputText);
    PasswordDeriveBytes secretKey = new PasswordDeriveBytes(Encoding.ASCII.GetBytes(key), Encoding.ASCII.GetBytes(salt));

    using (RijndaelManaged rijndaelCipher = new RijndaelManaged())
    using (ICryptoTransform decryptor = rijndaelCipher.CreateDecryptor(secretKey.GetBytes(32), secretKey.GetBytes(16)))
    using (MemoryStream memoryStream = new MemoryStream(encryptedData))
    using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
    {
        byte[] plainText = new byte[encryptedData.Length];
        cryptoStream.Read(plainText, 0, plainText.Length);
        string utf8 = Encoding.UTF8.GetString(plainText);
        return utf8;
    }
}

Answer 1

Base64填充由=或==组成，因此它看起来像多个Base64字符串，以某种方式附加在一起。你必须找到它们最初结束的地方，将它们分开，然后再试一次。

请注意，Base64字符串总是只有在需要时才会有填充，所以甚至可能需要在这里看不到的地方中断。

解密字符串时出错

1 个答案: