134 lines
4.1 KiB
C#
134 lines
4.1 KiB
C#
using System;
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using System.Text;
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using System.Linq;
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namespace AllBase
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{
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/// <summary>
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/// 实现Base64加密解密
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/// 作者：周公
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/// 时间：2007
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/// </summary>
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public static class Base64Encode
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{
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/// <summary>
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/// Base64加密
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/// </summary>
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/// <param name="codeName">加密采用的编码方式</param>
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/// <param name="source">待加密的明文</param>
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/// <returns></returns>
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public static string EncodeBase64(Encoding encode, string source)
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{
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byte[] bytes = encode.GetBytes(source);
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try
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{
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string code = Convert.ToBase64String(bytes);
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return code;
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}
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catch
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{
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return source;
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}
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}
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/// <summary>
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/// Base64加密，采用utf8编码方式加密
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/// </summary>
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/// <param name="source">待加密的明文</param>
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/// <returns>加密后的字符串</returns>
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public static string EncodeBase64(string source)
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{
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return EncodeBase64(Encoding.UTF8, source);
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}
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/// <summary>
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/// Base64解密
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/// </summary>
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/// <param name="codeName">解密采用的编码方式，注意和加密时采用的方式一致</param>
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/// <param name="result">待解密的密文</param>
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/// <returns>解密后的字符串</returns>
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public static string DecodeBase64(Encoding encode, string result)
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{
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string decode = "";
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try
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{
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byte[] bytes = Convert.FromBase64String(result);
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decode = encode.GetString(bytes);
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}
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catch
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{
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decode = result;
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}
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return decode;
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}
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/// <summary>
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/// Base64解密，采用utf8编码方式解密
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/// </summary>
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/// <param name="result">待解密的密文</param>
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/// <returns>解密后的字符串</returns>
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public static string DecodeBase64(string result)
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{
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return DecodeBase64(Encoding.UTF8, result);
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}
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#region 判断是否是base64
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/// <summary>
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/// 是否base64字符串
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/// </summary>
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/// <param name="base64Str">要判断的字符串</param>
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/// <returns></returns>
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public static bool IsBase64(string base64Str)
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{
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byte[] bytes = null;
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return IsBase64(base64Str, out bytes);
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}
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private static char[] base64CodeArray = new char[]
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{
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '='
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};
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/// <summary>
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/// 是否base64字符串
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/// </summary>
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/// <param name="base64Str">要判断的字符串</param>
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/// <param name="bytes">字符串转换成的字节数组</param>
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/// <returns></returns>
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public static bool IsBase64(string base64Str, out byte[] bytes)
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{
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//string strRegex = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";
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bytes = null;
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if (string.IsNullOrEmpty(base64Str))
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return false;
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else
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{
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if (base64Str.Contains(","))
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base64Str = base64Str.Split(',')[1];
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if (base64Str.Length % 4 != 0)
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return false;
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if (base64Str.Any(c => !base64CodeArray.Contains(c)))
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return false;
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}
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try
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{
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bytes = Convert.FromBase64String(base64Str);
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return true;
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}
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catch (FormatException)
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{
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return false;
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}
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}
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#endregion
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}
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}
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