求大神写一个UnEncode
问题描述：
这里是一个加密的方法，求大神写一个解密方法。
public static string Encode(string pSource, string pKey)
{
bool flag;
string s2;
StringBuilder stringBuilder = new StringBuilder();
pKey = pKey.PadRight(8, '8');
DESCryptoServiceProvider descryptoServiceProvider = new DESCryptoServiceProvider();
try
{
byte[] bArr1 = Encoding.ASCII.GetBytes(pKey);
byte[] bArr2 = Encoding.ASCII.GetBytes(pKey);
byte[] bArr3 = Encoding.UTF8.GetBytes(pSource);
descryptoServiceProvider.Mode = CipherMode.CBC;
descryptoServiceProvider.Key = bArr1;
descryptoServiceProvider.IV = bArr2;
string s1 = "";
MemoryStream memoryStream = new MemoryStream();
try
{
CryptoStream cryptoStream = new CryptoStream(memoryStream, descryptoServiceProvider.CreateEncryptor(), CryptoStreamMode.Write);
try
{
cryptoStream.Write(bArr3, 0, bArr3.Length);
cryptoStream.FlushFinalBlock();
s1 = Convert.ToBase64String(memoryStream.ToArray());
}
finally
{
flag = cryptoStream == null;
if (!flag)
cryptoStream.Dispose();
}
}
finally
{
flag = memoryStream == null;
if (!flag)
memoryStream.Dispose();
}
s2 = s1;
}
finally
{
flag = descryptoServiceProvider == null;
if (!flag)
descryptoServiceProvider.Dispose();
}
return s2;
}
答
des加密的吧，用下面的试试了
/// <summary>
/// DEC 解密过程
/// </summary>
/// <param name="pToDecrypt">被解密的字符串</param>
/// <returns>返回被解密的字符串</returns>
public static string Decrypt(string pToDecrypt)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.Mode = CipherMode.CBC;
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
string deskey = pKey.PadRight(8, '8');
des.Key = ASCIIEncoding.ASCII.GetBytes(deskey); //建立加密对象的密钥和偏移量，此值重要，不能修改
des.IV = ASCIIEncoding.ASCII.GetBytes(deskey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.UTF8.GetString(ms.ToArray());
}
之前这个对应的加密是这样的，和你的有点出入，不懂能否解密
/// <summary>
/// DEC 加密过程
/// </summary>
/// <param name="pToDecrypt">被解密的字符串</param>
/// <returns>返回被解密的字符串</returns>
public static string Encrypt(string pToEncrypt)
{
string deskey = pKey.PadRight(8, '8');
//访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.Key = ASCIIEncoding.ASCII.GetBytes(deskey); //建立加密对象的密钥和偏移量
des.IV = ASCIIEncoding.ASCII.GetBytes(deskey); //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);//把字符串放到byte数组中
MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流
//定义将数据流链接到加密转换的流
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//上面已经完成了把加密后的结果放到内存中去
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
答
这个你可以根据算法自己写下。
答
///
/// DEC 解密过程
///
/// 被解密的字符串
/// 返回被解密的字符串
public static string Decrypt(string pToDecrypt, string pKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.Mode = CipherMode.CBC;
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
string deskey = pKey.PadRight(8, '8');
des.Key = ASCIIEncoding.ASCII.GetBytes(deskey); //建立加密对象的密钥和偏移量，此值重要，不能修改
des.IV = ASCIIEncoding.ASCII.GetBytes(deskey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.UTF8.GetString(ms.ToArray());
}