c# System.Security.Cryptography.CryptographicException:“要解密的数据的长度无效。”(ECB)

[weixin_44352963]

大神帮我看看这程序为什么出现 System.Security.Cryptography.CryptographicException:“要解密的数据的长度无效。”？？？

声明：
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace MD5_Encryption_Decryption
{
public class MD5_Encryption_Decryption
{
/// <summary>
/// 使用给定明文加密
/// </summary>
/// <param name="original">明文</param>
/// <param name="key">密钥</param>
/// <returns>密文</returns>
public static string Encryption(string original,string key)
{
byte[] buff = Encoding.Default.GetBytes(original);
byte[] kb = Encoding.Default.GetBytes(key);
return Convert.ToString(Encryption(buff, kb));
}
/// <summary>
/// 给指定密文解密
/// </summary>
/// <param name="encrypted">密文</param>
/// <param name="key">密钥</param>
/// <returns></returns>
public static string Decryption(string encrypted,string key)
{
byte[] buff = Encoding.Default.GetBytes(encrypted);
byte[] kb = Encoding.Default.GetBytes(key);
return Encoding.Default.GetString(Decryption(buff, kb));
}
public static byte[] MakeMD5(byte[] original)
{
MD5CryptoServiceProvider Hashmd5 = new MD5CryptoServiceProvider();
byte[] keyhash = Hashmd5.ComputeHash(original);
return keyhash;
}
public static byte[] Encryption(byte[] original,byte[] key)
{
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
des.Key = MakeMD5(key);
des.Mode = CipherMode.ECB;
return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length);
}
public static byte[] Decryption(byte[] encrypted,byte[] key)
{
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
des.Key = MakeMD5(key);
des.Mode = CipherMode.ECB;
return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length);
}
private static byte[] Keys = { 0x17, 0x34, 0x59, 0x78, 0x90, 0xab, 0xcd, 0xef };

public static string SymmetryEncrypt(string encryptString,string encryptKey)
{
try
{
byte[] rgbKey = Encoding.Default.GetBytes(encryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.Default.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream,dCSP.CreateEncryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}catch(Exception)
{
return encryptString;
}
}
public static string SymmetryDecrypt(string decryptString,string decryptKey)
{
try {
byte[] rgbKey = Encoding.Default.GetBytes(decryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.Default.GetBytes(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}catch(Exception)
{
return decryptString;
}
}
}
}





引用：

data = File.ReadAllText(textBox1.Text);
#region 加密
keydata = MD5_Encryption_Decryption.MD5_Encryption_Decryption.Decryption(data, key);
#endregion

[小眼聚光~]

看不懂= =
把 textBox1.Text 的值贴出来看具体错误呢~

[jxdnzxb6369]

MD5，不可逆，用3des

[jxdnzxb6369]

要先加密，SymmetryDecrypt，SymmetryEncrypt加解蜜

[娃都会打酱油了]

3DES秘钥长度要求16或者24位，MD5结果是36位，你觉得MD5的结果符合3DES秘钥要求吗？你可以将MD5的结果截取24位 https://blog.csdn.net/starfd/article/details/78783709