密码加密类(PermissionBase)

最新推荐文章于 2022-08-09 10:46:51 发布

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最新推荐文章于 2022-08-09 10:46:51 发布

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分类专栏： [15]字符串加密类文章标签：加密 null string 解密 byte system

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本文介绍了一种使用SHA1进行字符串加密的方法，该方法返回一个40字符的加密字符串。此外，还提供了一种利用DES算法进行加密和解密的技术，其中包括具体的实现代码。

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using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;
/// <summary>
/// 字符串加密解密类。
/// </summary>
public sealed class StringSecurity
{
    private StringSecurity() { }

    #region SHA1 加密

    /// <summary>
    /// 使用SHA1加密字符串。
    /// </summary>
    /// <param name="inputString">输入字符串。</param>
    /// <returns>加密后的字符串。（40个字符）</returns>
    public static string StringToSHA1Hash(string inputString)
    {
        SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
        byte[] encryptedBytes = sha1.ComputeHash(Encoding.ASCII.GetBytes(inputString));
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < encryptedBytes.Length; i++)
        {
            sb.AppendFormat("{0:x2}", encryptedBytes[i]);
        }
        return sb.ToString();
    }

    #endregion

    #region DES 加密/解密

    private static byte[] key = ASCIIEncoding.ASCII.GetBytes("caikelun");
    private static byte[] iv = ASCIIEncoding.ASCII.GetBytes("12345678");

    /// <summary>
    /// DES加密。
    /// </summary>
    /// <param name="inputString">输入字符串。</param>
    /// <returns>加密后的字符串。</returns>
    public static string DESEncrypt(string inputString)
    {
        MemoryStream ms = null;
        CryptoStream cs = null;
        StreamWriter sw = null;

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        try
        {
            ms = new MemoryStream();
            cs = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);
            sw = new StreamWriter(cs);
            sw.Write(inputString);
            sw.Flush();
            cs.FlushFinalBlock();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
        }
        finally
        {
            if (sw != null) sw.Close();
            if (cs != null) cs.Close();
            if (ms != null) ms.Close();
        }
    }

    /// <summary>
    /// DES解密。
    /// </summary>
    /// <param name="inputString">输入字符串。</param>
    /// <returns>解密后的字符串。</returns>
    public static string DESDecrypt(string inputString)
    {
        MemoryStream ms = null;
        CryptoStream cs = null;
        StreamReader sr = null;

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        try
        {
            ms = new MemoryStream(Convert.FromBase64String(inputString));
            cs = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read);
            sr = new StreamReader(cs);
            return sr.ReadToEnd();
        }
        finally
        {
            if (sr != null) sr.Close();
            if (cs != null) cs.Close();
            if (ms != null) ms.Close();
        }
    }

    #endregion

}