.Net框架由于拥有CLR提供的丰富库支持，只需很少的代码即可实现先前使用C等旧式语言很难实现的加密算法。本类实现一些常用机密算法，供参考。其中MD5算法返回Int的ToString字串。返回数字字母型结果的算法参见之前Blog文章。
using System;
using System.IO;
using System.Data;
using System.Text;
using System.Diagnostics;
using System.Security;
using System.Security.Cryptography;
namespace com.Quickline.Encrypt
...{
/**//// <summary>
/// 类名：HashEncrypt
/// 作用：对传入的字符串进行Hash运算，返回通过Hash算法加密过的字串。
/// 属性：［无］
/// 构造函数额参数：
/// IsReturnNum:是否返回为加密后字符的Byte代码
/// IsCaseSensitive：是否区分大小写。
/// 方法：此类提供MD5，SHA1，SHA256，SHA512等四种算法，加密字串的长
度依次增大。
/**//// </summary>
public class HashEncrypt
...{
//private string strIN;
private bool isReturnNum;
private bool isCaseSensitive;
public HashEncrypt(bool IsCaseSensitive,bool IsReturnNum)
...{
this.isReturnNum = IsReturnNum;
this.isCaseSensitive = IsCaseSensitive;
}
private string getstrIN(string strIN)
...{
//string strIN = strIN;
if (strIN.Length == 0)
...{
strIN = "~NULL~";
}
if (isCaseSensitive == false)
...{
strIN = strIN.ToUpper();
}
return strIN;
}
public string MD5Encrypt(string strIN)
...{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
MD5 md5 = new MD5CryptoServiceProvider();
tmpByte =
md5.ComputeHash(GetKeyByteArray(getstrIN(strIN)));
md5.Clear();
return GetStringValue(tmpByte);
}
public string SHA1Encrypt(string strIN)
...{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
SHA1 sha1 = new SHA1CryptoServiceProvider();
tmpByte = sha1.ComputeHash(GetKeyByteArray(strIN));
sha1.Clear();
return GetStringValue(tmpByte);
}
public string SHA256Encrypt(string strIN)
...{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
SHA256 sha256 = new SHA256Managed();
tmpByte =
sha256.ComputeHash(GetKeyByteArray(strIN));
sha256.Clear();
return GetStringValue(tmpByte);
}
public string SHA512Encrypt(string strIN)
...{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
SHA512 sha512 = new SHA512Managed();
tmpByte =
sha512.ComputeHash(GetKeyByteArray(strIN));
sha512.Clear();
return GetStringValue(tmpByte);
}
/**//// <summary>
/// 使用DES加密（Added by niehl 2005-4-6）
/// </summary>
/// <param name="originalValue">待加密的字符串</param>
/// <param name="key">密钥(最大长度8)</param>
/// <param name="IV">初始化向量(最大长度8)</param>
/// <returns>加密后的字符串</returns>
public string DESEncrypt(string originalValue,string key,string IV)
...{
//将key和IV处理成8个字符
key += "12345678";
IV += "12345678";
key = key.Substring(0,8);
IV = IV.Substring(0,8);
SymmetricAlgorithm sa;
ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
byte[] byt;
sa = new DESCryptoServiceProvider();
sa.Key = Encoding.UTF8.GetBytes(key);
sa.IV = Encoding.UTF8.GetBytes(IV);
ct = sa.CreateEncryptor();
byt = Encoding.UTF8.GetBytes(originalValue);
ms = new MemoryStream();
cs = new CryptoStream(ms, ct,
CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Convert.ToBase64String(ms.ToArray());
}
public string DESEncrypt(string originalValue,string key)
...{
return DESEncrypt(originalValue,key,key);
}
/**//// <summary>
/// 使用DES解密（Added by niehl 2005-4-6）
/// </summary>
/// <param name="encryptedValue">待解密的字符串</param>
/// <param name="key">密钥(最大长度8)</param>
/// <param name="IV">m初始化向量(最大长度8)</param>
/// <returns>解密后的字符串</returns>
public string DESDecrypt(string encryptedValue,string key,string IV)
...{
//将key和IV处理成8个字符
key += "12345678";
IV += "12345678";
key = key.Substring(0,8);
IV = IV.Substring(0,8);
SymmetricAlgorithm sa;
ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
byte[] byt;
sa = new DESCryptoServiceProvider();
sa.Key = Encoding.UTF8.GetBytes(key);
sa.IV = Encoding.UTF8.GetBytes(IV);
ct = sa.CreateDecryptor();
byt = Convert.FromBase64String(encryptedValue);
ms = new MemoryStream();
cs = new CryptoStream(ms, ct,
CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Encoding.UTF8.GetString(ms.ToArray());
}
public string DESDecrypt(string encryptedValue,string key)
...{
return DESDecrypt(encryptedValue,key,key);
}
private string GetStringValue(byte[] Byte)
...{
string tmpString = "";
if (this.isReturnNum == false)
...{
ASCIIEncoding Asc = new ASCIIEncoding();
tmpString = Asc.GetString(Byte);
}
else
...{
int iCounter;
for
(iCounter=0;iCounter<Byte.Length;iCounter
using System;using System.IO;using System.Data;using System.Text;using System.Diagnostics;using System.Security;using System.Security.Cryptography;namespace com.Quickline.Encrypt...{ /**//// <summary> /// 类名：HashEncrypt /// 作用：对传入的字符串进行Hash运算，返回通过Hash算法加密过的字串。 /// 属性：［无］ /// 构造函数额参数： /// IsReturnNum:是否返回为加密后字符的Byte代码 /// IsCaseSensitive：是否区分大小写。 /// 方法：此类提供MD5，SHA1，SHA256，SHA512等四种算法，加密字串的长度依次增大。 /**//// </summary> public class HashEncrypt ...{ //private string strIN; private bool isReturnNum; private bool isCaseSensitive; public HashEncrypt(bool IsCaseSensitive,bool IsReturnNum) ...{ this.isReturnNum = IsReturnNum; this.isCaseSensitive = IsCaseSensitive; } private string getstrIN(string strIN) ...{ //string strIN = strIN; if (strIN.Length == 0) ...{ strIN = "~NULL~"; } if (isCaseSensitive == false) ...{ strIN = strIN.ToUpper(); } return strIN; } public string MD5Encrypt(string strIN) ...{ //string strIN = getstrIN(strIN); byte[] tmpByte; MD5 md5 = new MD5CryptoServiceProvider(); tmpByte =md5.ComputeHash(GetKeyByteArray(getstrIN(strIN))); md5.Clear(); return GetStringValue(tmpByte); } public string SHA1Encrypt(string strIN) ...{ //string strIN = getstrIN(strIN); byte[] tmpByte; SHA1 sha1 = new SHA1CryptoServiceProvider(); tmpByte = sha1.ComputeHash(GetKeyByteArray(strIN)); sha1.Clear(); return GetStringValue(tmpByte); } public string SHA256Encrypt(string strIN) ...{ //string strIN = getstrIN(strIN); byte[] tmpByte; SHA256 sha256 = new SHA256Managed(); tmpByte =sha256.ComputeHash(GetKeyByteArray(strIN)); sha256.Clear(); return GetStringValue(tmpByte); } public string SHA512Encrypt(string strIN) ...{ //string strIN = getstrIN(strIN); byte[] tmpByte; SHA512 sha512 = new SHA512Managed(); tmpByte =sha512.ComputeHash(GetKeyByteArray(strIN)); sha512.Clear(); return GetStringValue(tmpByte); } /**//// <summary> /// 使用DES加密（Added by niehl 2005-4-6） /// </summary> /// <param name="originalValue">待加密的字符串</param> /// <param name="key">密钥(最大长度8)</param> /// <param name="IV">初始化向量(最大长度8)</param> /// <returns>加密后的字符串</returns> public string DESEncrypt(string originalValue,string key,string IV) ...{ //将key和IV处理成8个字符 key += "12345678"; IV += "12345678"; key = key.Substring(0,8); IV = IV.Substring(0,8); SymmetricAlgorithm sa; ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; sa = new DESCryptoServiceProvider(); sa.Key = Encoding.UTF8.GetBytes(key); sa.IV = Encoding.UTF8.GetBytes(IV); ct = sa.CreateEncryptor(); byt = Encoding.UTF8.GetBytes(originalValue); ms = new MemoryStream(); cs = new CryptoStream(ms, ct,CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } public string DESEncrypt(string originalValue,string key) ...{ return DESEncrypt(originalValue,key,key); } /**//// <summary> /// 使用DES解密（Added by niehl 2005-4-6） /// </summary> /// <param name="encryptedValue">待解密的字符串</param> /// <param name="key">密钥(最大长度8)</param> /// <param name="IV">m初始化向量(最大长度8)</param> /// <returns>解密后的字符串</returns> public string DESDecrypt(string encryptedValue,string key,string IV) ...{ //将key和IV处理成8个字符 key += "12345678"; IV += "12345678"; key = key.Substring(0,8); IV = IV.Substring(0,8); SymmetricAlgorithm sa; ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; sa = new DESCryptoServiceProvider(); sa.Key = Encoding.UTF8.GetBytes(key); sa.IV = Encoding.UTF8.GetBytes(IV); ct = sa.CreateDecryptor(); byt = Convert.FromBase64String(encryptedValue); ms = new MemoryStream(); cs = new CryptoStream(ms, ct,CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } public string DESDecrypt(string encryptedValue,string key) ...{ return DESDecrypt(encryptedValue,key,key); } private string GetStringValue(byte[] Byte) ...{ string tmpString = ""; if (this.isReturnNum == false) ...{ ASCIIEncoding Asc = new ASCIIEncoding(); tmpString = Asc.GetString(Byte); } else ...{ int iCounter; for(iCounter=0;iCounter<Byte.Length;iCounter