DES解密，ECB模式，PKCS7填充标准

最近⼯作中⽤到了des解密，之前没接触过，花了点时间去研究了⼀下，des算是⽐较基础的加密⽅式了，这边主要讲的是ECB模式，ECB模式作为⼀种基本⼯作模式，具有操作简单，易于实现的特点。同时由于其分组的独⽴性，利于实现并⾏处理，并且能很好地防⽌误差传播。个⼈觉得ECB⽐较适⽤于密钥保护。代码如下：

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public class DesHelper {

private static String _ConstValue = \"12345678\";

public static String Decipher(String Str, bool IncludeLocalInfo) {

if (null == Str || 0 == Str.Length) return \"\"; try {

SymmetricAlgorithm sa = new DESCryptoServiceProvider(); String _Key = _ConstValue;

sa.Key = Encoding.UTF8.GetBytes(_Key);

sa.IV = Encoding.UTF8.GetBytes(_ConstValue);

sa.Mode = System.Security.Cryptography.CipherMode.ECB; sa.Padding = PaddingMode.PKCS7;

ICryptoTransform ct = sa.CreateDecryptor(); byte[] byt = Convert.FromBase64String(Str); MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close();

return Encoding.UTF8.GetString(ms.ToArray()); }

catch(Exception e) { }

return \"\"; } }

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没错，代码就是如此简单