加解密工具类 - C#小函数类推荐

       此文记录的是一个8比特的加解密算法的函数。

/***

    加解密工具类

    Austin Liu 刘恒辉
    Project Manager and Software Designer

    E-Mail: [email protected]
    Blog:   http://lzhdim.cnblogs.com
    Date:   2024-01-15 15:18:00

    使用说明：
        1、加密；
            string DesString = CryptogramUtil.DESEncrypt8Bit("测试字符串","1234567890"):
        2、解密；
            string DesString = CryptogramUtil.DESDecrypt8Bit("测试字符串","1234567890"):

***/

namespace Lzhdim.LPF.Utility
{
    using System;
    using System.IO;
    using System.Security.Cryptography;
    using System.Text;

    /// <summary>
    /// Cryptogram Object
    /// </summary>
    public static class CryptogramUtil
    {
        /// <summary>
        /// DES Decrypt with 8 bit key
        /// </summary>
        /// <param name="srcString">the string which need to decrypt</param>
        /// <param name="sKey">the key of decrypt,length in 8 bit</param>
        /// <returns>the string which had decrypted</returns>
        public static string DESDecrypt8Bit(string srcString, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[srcString.Length / 2];
            for (int x = 0; x < srcString.Length / 2; x++)
            {
                int i = (Convert.ToInt32(srcString.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            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);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            byte[] b = ms.ToArray();
            ms.Dispose();
            return System.Text.Encoding.Default.GetString(b);
        }

        /// <summary>
        /// DES Encrypt with 8 bit key
        /// </summary>
        /// <param name="srcString">the string which need to encrypt</param>
        /// <param name="sKey">the key of encrypt,length in 8 bit</param>
        /// <returns>the string which had encrypted</returns>
        public static string DESEncrypt8Bit(string srcString, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.Default.GetBytes(srcString);
            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);
            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();
        }
    }
}