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后臺一直用md5加密,一天群里人問,除了MD5還有其它的加密方法嗎?當時只知道還有個SHA,但怎么實現什么的都不清楚,于是當網上找了下,把幾種常見的加密方法都整理了下,用winform寫了個程序,如圖:

關鍵代碼

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

//ＭＤ5　　　　　　　不區分大小寫的
//type 類型，16位還是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();

}

///

/// 對字符串進行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，不可逆轉
///

/// 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，不可逆轉
///

/// 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，不可逆轉
///

/// 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);
}

//默認密鑰向量
private byte[] Keys = { 0xEF, 0xAB, 0x56, 0x78, 0x90, 0x34, 0xCD, 0x12 };
///

/// DES加密字符串
///

/// 待加密的字符串
/// 加密密鑰,要求為8位
/// 加密成功返回加密后的字符串，失敗返回源串
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
/// 解密密鑰,要求為8位,和加密密鑰相同
/// 解密成功返回解密后的字符串，失敗返源串
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;
}
}

該文章在 2012/1/4 22:55:20 編輯過