加密解密算法收藏

1、MD5加密解密

不可逆加密：

需要引用命名空间：

     using System.Security.Cryptography;
    using System.Text;
    using System.Web.Security;

/// <summary>
/// MD5 64位加密
/// </summary>
/// <param name="Sourcein">需要加密的字符串</param>
/// <returns></returns>
public static String MD5(String Sourcein)
{
    MD5CryptoServiceProvider provider = new MD5CryptoServiceProvider();
    byte[] bytes = Encoding.UTF8.GetBytes(Sourcein);
    return Convert.ToBase64String(provider.ComputeHash(bytes));
}
 
 
/// <summary>
/// MD5 32位加密
/// </summary>
/// <param name="Sourcein">需要加密的字符串</param>
/// <returns></returns>
public static String MD5_32(String Sourcein)
{
    return FormsAuthentication.HashPasswordForStoringInConfigFile(Sourcein, "MD5");
}

加密解密对：

#region ========加密========
 
  /// <summary>
  /// 加密
  /// </summary>
  /// <param name="Text"></param>
  /// <returns></returns>
  public static string Encrypt(string Text)
  {
      return Encrypt(Text, "key");//key:加解密密钥
  }
  /// <summary> 
  /// 加密数据 
  /// </summary> 
  /// <param name="Text"></param> 
  /// <param name="sKey"></param> 
  /// <returns></returns> 
  public static string Encrypt(string Text, string sKey)
  {
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
      byte[] inputByteArray;
      inputByteArray = Encoding.Default.GetBytes(Text);
      des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      System.IO.MemoryStream ms = new System.IO.MemoryStream();
      CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
      cs.Write(inputByteArray, 0, inputByteArray.Length);
      cs.FlushFinalBlock();
      StringBuilder ret = new StringBuilder();
      foreach (byte b in ms.ToArray())
      {
          ret.AppendFormat("{0:X2}", b);
      }
      return ret.ToString();
  }
 
  #endregion
 
  #region ========解密========
 
 
  /// <summary>
  /// 解密
  /// </summary>
  /// <param name="Text"></param>
  /// <returns></returns>
  public static string Decrypt(string Text)
  {
      return Decrypt(Text, "key");//key:加解密密钥
  }
  /// <summary> 
  /// 解密数据 
  /// </summary> 
  /// <param name="Text"></param> 
  /// <param name="sKey"></param> 
  /// <returns></returns> 
  public static string Decrypt(string Text, string sKey)
  {
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
      int len;
      len = Text.Length / 2;
      byte[] inputByteArray = new byte[len];
      int x, i;
      for (x = 0; x < len; x++)
      {
          i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
          inputByteArray[x] = (byte)i;
      }
      des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      System.IO.MemoryStream ms = new System.IO.MemoryStream();
      CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
      cs.Write(inputByteArray, 0, inputByteArray.Length);
      cs.FlushFinalBlock();
      return Encoding.Default.GetString(ms.ToArray());
  }
 
  #endregion 

2.RSA 加密解密

需要引用的命名空间

   using System;
   using System.Text;
   using System.Security.Cryptography;

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#region RSA 加密解密
 
#region RSA 的密钥产生
 
/// <summary>
/// RSA 的密钥产生 产生私钥 和公钥 
/// </summary>
/// <param name="xmlKeys"></param>
/// <param name="xmlPublicKey"></param>
public void RSAKey(out string xmlKeys, out string xmlPublicKey)
{
    System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
    xmlKeys = rsa.ToXmlString(true);
    xmlPublicKey = rsa.ToXmlString(false);
}
#endregion
 
#region RSA的加密函数
//############################################################################## 
//RSA 方式加密 
//说明KEY必须是XML的行式,返回的是字符串 
//在有一点需要说明！！该加密方式有 长度 限制的！！ 
//############################################################################## 
 
//RSA的加密函数  string
public string RSAEncrypt(string xmlPublicKey, string m_strEncryptString)
{
 
    byte[] PlainTextBArray;
    byte[] CypherTextBArray;
    string Result;
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
    rsa.FromXmlString(xmlPublicKey);
    PlainTextBArray = (new UnicodeEncoding()).GetBytes(m_strEncryptString);
    CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
    Result = Convert.ToBase64String(CypherTextBArray);
    return Result;
 
}
//RSA的加密函数 byte[]
public string RSAEncrypt(string xmlPublicKey, byte[] EncryptString)
{
 
    byte[] CypherTextBArray;
    string Result;
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
    rsa.FromXmlString(xmlPublicKey);
    CypherTextBArray = rsa.Encrypt(EncryptString, false);
    Result = Convert.ToBase64String(CypherTextBArray);
    return Result;
 
}
#endregion
 
#region RSA的解密函数
//RSA的解密函数  string
public string RSADecrypt(string xmlPrivateKey, string m_strDecryptString)
{
    byte[] PlainTextBArray;
    byte[] DypherTextBArray;
    string Result;
    System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
    rsa.FromXmlString(xmlPrivateKey);
    PlainTextBArray = Convert.FromBase64String(m_strDecryptString);
    DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
    Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
    return Result;
 
}
 
//RSA的解密函数  byte
public string RSADecrypt(string xmlPrivateKey, byte[] DecryptString)
{
    byte[] DypherTextBArray;
    string Result;
    System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
    rsa.FromXmlString(xmlPrivateKey);
    DypherTextBArray = rsa.Decrypt(DecryptString, false);
    Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
    return Result;
 
}
#endregion
 
#endregion
 
#region RSA数字签名
 
#region 获取Hash描述表
//获取Hash描述表 
public bool GetHash(string m_strSource, ref byte[] HashData)
{
    //从字符串中取得Hash描述 
    byte[] Buffer;
    System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
    Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
    HashData = MD5.ComputeHash(Buffer);
 
    return true;
}
 
//获取Hash描述表 
public bool GetHash(string m_strSource, ref string strHashData)
{
 
    //从字符串中取得Hash描述 
    byte[] Buffer;
    byte[] HashData;
    System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
    Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
    HashData = MD5.ComputeHash(Buffer);
 
    strHashData = Convert.ToBase64String(HashData);
    return true;
 
}
 
//获取Hash描述表 
public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData)
{
 
    //从文件中取得Hash描述 
    System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
    HashData = MD5.ComputeHash(objFile);
    objFile.Close();
 
    return true;
 
}
 
//获取Hash描述表 
public bool GetHash(System.IO.FileStream objFile, ref string strHashData)
{
 
    //从文件中取得Hash描述 
    byte[] HashData;
    System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
    HashData = MD5.ComputeHash(objFile);
    objFile.Close();
 
    strHashData = Convert.ToBase64String(HashData);
 
    return true;
 
}
#endregion
 
#region RSA签名
//RSA签名 
public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref byte[] EncryptedSignatureData)
{
 
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //设置签名的算法为MD5 
    RSAFormatter.SetHashAlgorithm("MD5");
    //执行签名 
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
 
    return true;
 
}
 
//RSA签名 
public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref string m_strEncryptedSignatureData)
{
 
    byte[] EncryptedSignatureData;
 
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //设置签名的算法为MD5 
    RSAFormatter.SetHashAlgorithm("MD5");
    //执行签名 
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
 
    m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
 
    return true;
 
}
 
//RSA签名 
public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref byte[] EncryptedSignatureData)
{
 
    byte[] HashbyteSignature;
 
    HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //设置签名的算法为MD5 
    RSAFormatter.SetHashAlgorithm("MD5");
    //执行签名 
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
 
    return true;
 
}
 
//RSA签名 
public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref string m_strEncryptedSignatureData)
{
 
    byte[] HashbyteSignature;
    byte[] EncryptedSignatureData;
 
    HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //设置签名的算法为MD5 
    RSAFormatter.SetHashAlgorithm("MD5");
    //执行签名 
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
 
    m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
 
    return true;
 
}
#endregion
 
#region RSA 签名验证
 
public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
{
 
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的时候HASH算法为MD5 
    RSADeformatter.SetHashAlgorithm("MD5");
 
    if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
    {
        return true;
    }
    else
    {
        return false;
    }
 
}
 
public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, byte[] DeformatterData)
{
 
    byte[] HashbyteDeformatter;
 
    HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);
 
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的时候HASH算法为MD5 
    RSADeformatter.SetHashAlgorithm("MD5");
 
    if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
    {
        return true;
    }
    else
    {
        return false;
    }
 
}
 
public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, string p_strDeformatterData)
{
 
    byte[] DeformatterData;
 
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的时候HASH算法为MD5 
    RSADeformatter.SetHashAlgorithm("MD5");
 
    DeformatterData = Convert.FromBase64String(p_strDeformatterData);
 
    if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
    {
        return true;
    }
    else
    {
        return false;
    }
 
}
 
public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, string p_strDeformatterData)
{
 
    byte[] DeformatterData;
    byte[] HashbyteDeformatter;
 
    HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
 
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的时候HASH算法为MD5 
    RSADeformatter.SetHashAlgorithm("MD5");
 
    DeformatterData = Convert.FromBase64String(p_strDeformatterData);
 
    if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
    {
        return true;
    }
    else
    {
        return false;
    }
 
}
 
 
#endregion
 
 
#endregion