加解密代码,CSharp代码库,德仔网

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代码分类
【CSharp】加解密
作者:lwh / 发布于2013/11/28/ 417
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;
using System.Text;

/// <summary>
/// 加解密
/// </summary>
public static class CryptHelper
{
  #region RSA加密

  /// <summary>
  /// 用指定公钥加密文本
  /// </summary>
  /// <param name="publicKey">公钥</param>
  /// <param name="input">文本</param>
  /// <returns></returns>
  public static string RsaEncrypt(string publicKey, string input)
  {
    const string sFormat =
      "<RSAKeyValue><Modulus>{0}</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
    var provider = new RSACryptoServiceProvider();
    var arrPubKey = Hex2Bytes(publicKey);
    var pkB64 = Convert.ToBase64String(arrPubKey);
    var xmlStr = string.Format(sFormat, pkB64);
    var bytesInput = Encoding.UTF8.GetBytes(input);
    provider.FromXmlString(xmlStr);
    var encryptArray = provider.Encrypt(bytesInput, false);
    var hexStr = BitConverter.ToString(encryptArray).Replace("-", "");
    return hexStr.ToLower();
  }

  #endregion

  #region 公用函数

  /// <summary>
  /// 将字节转换成16进制数字
  /// </summary>
  /// <param name="bytes">字节数组</param>
  /// <returns></returns>
  public static string Bytes2Hex(byte[] bytes)
  {
    var buffer = new StringBuilder();
    foreach (var t in bytes)
    {
      buffer.AppendFormat("{0:x2}", t);
    }
    return buffer.ToString();
  }

  /// <summary>
  /// 将16进制数组转换成字节
  /// </summary>
  /// <param name="input">16进制数组</param>
  /// <returns></returns>
  /// <exception cref="ArgumentOutOfRangeException"></exception>
  public static byte[] Hex2Bytes(string input)
  {
    if (string.IsNullOrEmpty(input)) return null;
    var offset = input.Length%2;
    if (offset == 1) input = "0" + input;
    int i;
    var list = new List<byte>();
    for (i = 0; i < input.Length; i += 2)
    {
      var temp = input.Substring(i, 2);
      byte bv;
      var success = byte.TryParse(temp, NumberStyles.HexNumber, null, out bv);
      if (!success) throw new ArgumentOutOfRangeException();
      list.Add(bv);
    }
    return list.ToArray();
  }

  #endregion

  #region SHA1加密

  /// <summary>
  /// SHA1加密 使用缺省密钥给字符串加密
  /// </summary>
  /// <param name="sourceString"></param>
  /// <returns></returns>
  public static string Sha1Encrypt(string sourceString)
  {
    var data = Encoding.Default.GetBytes(sourceString);
    HashAlgorithm sha = new SHA1CryptoServiceProvider();
    var bytes = sha.ComputeHash(data);
    return BitConverter.ToString(bytes).Replace("-", "");
  }

  #endregion

  #region DES加解密

  /// <summary>
  /// DES加密
  /// </summary>
  /// <param name="pubKey"></param>
  /// <param name="input"></param>
  /// <returns></returns>
  public static string DesEncrypt(string pubKey, string input)
  {
    var des = new DESCryptoServiceProvider();
    var bytes = Encoding.UTF8.GetBytes(input);
    des.Key = Encoding.ASCII.GetBytes(pubKey);
    des.IV = Encoding.ASCII.GetBytes(pubKey);
    using (var ms = new MemoryStream())
    {
      using (var cryptoStream = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
      {
        cryptoStream.Write(bytes, 0, bytes.Length);
        cryptoStream.FlushFinalBlock();
      }
      var data = ms.ToArray();
      return BitConverter.ToString(data).Replace("-", "");
    }
  }

  /// <summary>
  /// DES解密
  /// </summary>
  /// <param name="pubKey"></param>
  /// <param name="input"></param>
  /// <returns></returns>
  public static string DesDecrypt(string pubKey, string input)
  {
    var des = new DESCryptoServiceProvider();
    var bytes = Hex2Bytes(input);
    des.Key = Encoding.ASCII.GetBytes(pubKey);
    des.IV = Encoding.ASCII.GetBytes(pubKey);
    using (var ms = new MemoryStream())
    {
      using (var cryptoStream = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
      {
        cryptoStream.Write(bytes, 0, bytes.Length);
        cryptoStream.FlushFinalBlock();
      }
      var data = ms.ToArray();
      return Encoding.UTF8.GetString(data);
    }
  }

  #endregion

  #region MD5加密

  /// <summary>
  /// MD5加密
  /// </summary>
  /// <param name="input">输入</param>
  /// <returns></returns>
  public static string Md5Encrypt(string input)
  {
    MD5 md5 = new MD5CryptoServiceProvider();
    var data = Encoding.UTF8.GetBytes(input);
    var encs = md5.ComputeHash(data);
    return BitConverter.ToString(encs).Replace("-", "");
  }

  #endregion
}
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