后台一直用md5加密,一天群里人问,除了MD5还有其它的加密方法吗?当时只知道还有个SHA,但怎么实现什么的都不清楚,于是当网上找了下,把几种常见的加密方法都整理了下,用winform写了个程序,如图:

关键代码

using System.Security;
using System.Security.Cryptography;
using System.Web;
using System.IO;

//ＭＤ5　　　　　　　不区分大小写的
//type 类型，16位还是32位，16位就是取32位的第8到16位
public string DoMd5Encode(string pwd,string type)
{
byte[] result = Encoding.Default.GetBytes(pwd);
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] output = md5.ComputeHash(result);
if (type == "16")
return BitConverter.ToString(output).Replace("-", "").ToLower().Substring(8,16);
else
return BitConverter.ToString(output).Replace("-", "").ToLower();

}

///

/// 对字符串进行SHA1加密
///

/// 需要加密的字符串
/// 密文
public string SHA1_Encrypt(string Source_String)
{
byte[] StrRes = Encoding.Default.GetBytes(Source_String);
HashAlgorithm iSHA = new SHA1CryptoServiceProvider();
StrRes = iSHA.ComputeHash(StrRes);
StringBuilder EnText = new StringBuilder();
foreach (byte iByte in StrRes)
{
EnText.AppendFormat("{0:x2}", iByte);
}
return EnText.ToString();
}

///

/// SHA256加密，不可逆转
///

/// string str:被加密的字符串
/// 返回加密后的字符串
private string SHA256Encrypt(string str)
{
System.Security.Cryptography.SHA256 s256 = new System.Security.Cryptography.SHA256Managed();
byte[] byte1;
byte1 = s256.ComputeHash(Encoding.Default.GetBytes(str));
s256.Clear();
return Convert.ToBase64String(byte1);
}

///

/// SHA384加密，不可逆转
///

/// string str:被加密的字符串
/// 返回加密后的字符串
private string SHA384Encrypt(string str)
{
System.Security.Cryptography.SHA384 s384 = new System.Security.Cryptography.SHA384Managed();
byte[] byte1;
byte1 = s384.ComputeHash(Encoding.Default.GetBytes(str));
s384.Clear();
return Convert.ToBase64String(byte1);
}

///

/// SHA512加密，不可逆转
///

/// string str:被加密的字符串
/// 返回加密后的字符串
private string SHA512Encrypt(string str)
{
System.Security.Cryptography.SHA512 s512 = new System.Security.Cryptography.SHA512Managed();
byte[] byte1;
byte1 = s512.ComputeHash(Encoding.Default.GetBytes(str));
s512.Clear();
return Convert.ToBase64String(byte1);
}

//默认密钥向量
private byte[] Keys = { 0xEF, 0xAB, 0x56, 0x78, 0x90, 0x34, 0xCD, 0x12 };
///

/// DES加密字符串
///

/// 待加密的字符串
/// 加密密钥,要求为8位
/// 加密成功返回加密后的字符串，失败返回源串
public string EncryptDES(string encryptString, string encryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.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
{
return encryptString;
}
}

///

/// DES解密字符串
///

/// 待解密的字符串
/// 解密密钥,要求为8位,和加密密钥相同
/// 解密成功返回解密后的字符串，失败返源串
public string DecryptDES(string decryptString, string decryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(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 Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}

该文章在 2012/1/4 22:55:20 编辑过