急求C#里面如何加密解密!
如题,ASP里面有MD5的，但是不能解密，
看了看，加密解密还挺麻烦，什么向量之类的，那个高手能讲解一些阿！
100分 在线等！
[解决办法]
向量就相当于密钥吧
public class Sec
{
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
private static string KeyCode = "xxxxxx ";
public static string EnCode(string encryptString)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(KeyCode);
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;
}
}
public static string DeCode(string decryptString)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(KeyCode);
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;
}
}
}
[解决办法]
DES加密解密代码：
C#
-----------------------------------------------
//名称空间
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
//方法
//加密方法
public string Encrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//把字符串放到byte数组中
//原来使用的UTF8编码，我改成Unicode编码了，不行
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
//建立加密对象的密钥和偏移量
//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
//使得输入密码必须输入英文文本
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);
//Write the byte array into the crypto stream
//(It will end up in the memory stream)
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the data back from the memory stream, and into a string
StringBuilder ret = new StringBuilder();
foreach(byte b in ms.ToArray())
{
//Format as hex
ret.AppendFormat( "{0:X2} ", b);
}
ret.ToString();
return ret.ToString();
}
//解密方法
public string Decrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//Put the input string into the byte array
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;
}
//建立加密对象的密钥和偏移量，此值重要，不能修改
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);
//Flush the data through the crypto stream into the memory stream
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the decrypted data back from the memory stream
//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.Default.GetString(ms.ToArray());
}
[解决办法]
一个加解密的类。
/// <summary>
/// RC2加解密类
/// </summary>
public class RC2_
{
private RC2 rc;
public string Key;
public string IV;
/// <summary>
/// 对称加密类的构造函数
/// </summary>
public RC2_(string key)
{
rc = new RC2CryptoServiceProvider();
Key = key;
IV = "#$^%&&*Yisifhsfjsljfslhgosdshf26382837sdfjskhf97(*&(* ";
}
/// <summary>
/// 对称加密类的构造函数
/// </summary>
public RC2_(string key, string iv)
{
rc = new RC2CryptoServiceProvider();
Key = key;
IV = iv;
}
/// <summary>
/// 获得密钥
/// </summary>
/// <returns> 密钥 </returns>
private byte[] GetLegalKey()
{
string sTemp = Key;
rc.GenerateKey();
byte[] bytTemp = rc.Key;
int KeyLength = bytTemp.Length;
if (sTemp.Length > KeyLength)
sTemp = sTemp.Substring(0, KeyLength);
else if (sTemp.Length < KeyLength)
sTemp = sTemp.PadRight(KeyLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/// <summary>
/// 获得初始向量IV
/// </summary>
/// <returns> 初试向量IV </returns>
private byte[] GetLegalIV()
{
string sTemp = IV;
rc.GenerateIV();
byte[] bytTemp = rc.IV;
int IVLength = bytTemp.Length;
if (sTemp.Length > IVLength)
sTemp = sTemp.Substring(0, IVLength);
else if (sTemp.Length < IVLength)
sTemp = sTemp.PadRight(IVLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/// <summary>
/// 加密方法
/// </summary>
/// <param name= "Source "> 待加密的串 </param>
/// <returns> 经过加密的串 </returns>
public string Encrypt(string Source)
{
try
{
byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
MemoryStream ms = new MemoryStream();
rc.Key = GetLegalKey();
rc.IV = GetLegalIV();
ICryptoTransform encrypto = rc.CreateEncryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
cs.Write(bytIn, 0, bytIn.Length);
cs.FlushFinalBlock();
ms.Close();
byte[] bytOut = ms.ToArray();
return Convert.ToBase64String(bytOut);
}
catch (Exception ex)
{
throw new Exception( "在文件加密的时候出现错误！错误提示： \n " + ex.Message);
}
}
/// <summary>
/// 解密方法
/// </summary>
/// <param name= "Source "> 待解密的串 </param>
/// <returns> 经过解密的串 </returns>
public string Decrypt(string Source)
{
try
{
byte[] bytIn = Convert.FromBase64String(Source);
MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
rc.Key = GetLegalKey();
rc.IV = GetLegalIV();
ICryptoTransform encrypto = rc.CreateDecryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
return sr.ReadToEnd();
}
catch (Exception ex)
{
throw new Exception( "在文件解密的时候出现错误！错误提示： \n " + ex.Message);
}
}
}
[解决办法]
using System;
using System.Text;
using System.Security.Cryptography;
/// <summary>
/// 根据输入的算法名进行运算,返回带字母的结果
/// </summary>
/// <param name= "value "> 进行加密的字符串 </param>
/// <param name= "EncryptName "> 算法名
/// 举例：MD5,SHA1,SHA256,SHA384,SHA512,RIPEMD160
/// </param>
/// <returns> 加密结果 </returns>
public static string EncryptValue(string value,string EncryptName)
{
byte[] hashvalue = (CryptoConfig.CreateFromName(EncryptName) as HashAlgorithm).ComputeHash(bytes(value));
StringBuilder text = new StringBuilder();
for (int i = 0, j = hashvalue.Length; i < j; i++)
text.Append(hashvalue[i].ToString( "x ").PadLeft(2, '0 '));
return text.ToString();
}
/// <summary>
/// 根据指定的值获取bytes
/// </summary>
/// <param name= "value "> 指定的值 </param>
/// <returns> bytes </returns>
public static byte[] bytes(string value)
{
return Encoding.ASCII.GetBytes(value);
}
DES,DSA,RSA速度太慢了
