using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Security.Cryptography;
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using System.IO;
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namespace CommonUtil
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{
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/// <summary>
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/// 安全工具类
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/// </summary>
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public abstract class SecurityUtil
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{
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private static readonly char[] CA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".ToCharArray();
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private static readonly int[] IA = InitIA();
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private static readonly int KeySize = 128;
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private static readonly int BlockSize = 128;
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private static readonly byte[] IvBytes = Encoding.UTF8.GetBytes("0102030405060708");//初始向量
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/// <summary>
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/// 初始化
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/// </summary>
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/// <returns></returns>
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private static int[] InitIA()
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{
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int len = 256;
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int[] a = new int[len];
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for (int i = 0; i < len; i++)
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{
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a[i] = -1;
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}
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for (int i = 0, iS = CA.Length; i < iS; i++)
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{
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a[CA[i]] = i;
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}
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a['='] = 0;
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return a;
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}
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/// <summary>
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/// 判断是否base64值
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static bool IsBase64Value(string str)
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{
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// Check special case
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int sLen = str != null ? str.Length : 0;
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if (sLen == 0)
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return false;
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// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
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// so we don't have to reallocate & copy it later.
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int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
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for (int i = 0; i < sLen; i++) // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
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{
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char currentChar = str[i];
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if (currentChar >= IA.Length)
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{
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return false;
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}
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if (IA[currentChar] < 0)
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{
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sepCnt++;
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}
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}
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// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
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if ((sLen - sepCnt) % 4 != 0)
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{
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return false;
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}
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return true;
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}
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/// <summary>
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/// 生成滑动窗口
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/// </summary>
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/// <param name="input">数据</param>
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/// <param name="slideSize">分词大小</param>
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/// <returns>分词元素</returns>
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public static List<string> GetSlideWindows(string input, int slideSize)
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{
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List<string> windows = new List<string>();
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int startIndex = 0;
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int endIndex = 0;
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int currentWindowSize = 0;
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string currentWindow = null;
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while (endIndex < input.Length || currentWindowSize > slideSize)
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{
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bool startsWithLetterOrDigit;
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if (currentWindow == null)
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{
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startsWithLetterOrDigit = false;
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}
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else
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{
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startsWithLetterOrDigit = IsLetterOrDigit(currentWindow[0]);
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}
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if (endIndex == input.Length && !startsWithLetterOrDigit)
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{
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break;
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}
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if (currentWindowSize == slideSize && !startsWithLetterOrDigit && IsLetterOrDigit(input[endIndex]))
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{
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endIndex++;
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currentWindow = input.Substring(startIndex, endIndex - startIndex);
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currentWindowSize = 5;
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}
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else
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{
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if (endIndex != 0)
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{
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if (startsWithLetterOrDigit)
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{
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currentWindowSize -= 1;
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}
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else
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{
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currentWindowSize -= 2;
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}
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startIndex++;
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}
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while (currentWindowSize < slideSize && endIndex < input.Length)
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{
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char currentChar = input[endIndex];
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if (IsLetterOrDigit(currentChar))
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{
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currentWindowSize += 1;
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}
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else
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{
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currentWindowSize += 2;
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}
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endIndex++;
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}
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currentWindow = input.Substring(startIndex, endIndex - startIndex);
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}
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windows.Add(currentWindow);
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}
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return windows;
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}
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/// <summary>
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/// 判断是否小写字母
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/// </summary>
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/// <param name="x"></param>
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/// <returns></returns>
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private static bool IsLetterOrDigit(char x)
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{
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if (0 <= x && x <= 127)
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{
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return true;
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}
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return false;
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}
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/// <summary>
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/// 压缩
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/// </summary>
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/// <param name="input"></param>
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/// <param name="toLength"></param>
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/// <returns></returns>
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private static byte[] Compress(byte[] input, int toLength)
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{
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if (toLength < 0)
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{
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return null;
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}
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byte[] output = new byte[toLength];
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for (int i = 0; i < output.Length; i++)
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{
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output[i] = 0;
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}
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for (int i = 0; i < input.Length; i++)
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{
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int index_output = i % toLength;
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output[index_output] ^= input[i];
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}
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return output;
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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="source">待加密的明文</param>
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/// <param name="encode">编码方式</param>
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/// <returns></returns>
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public static string EncodeBase64(string source, Encoding encode)
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{
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byte[] bytes = encode.GetBytes(source);
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return Convert.ToBase64String(bytes);
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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="source">待加密的明文</param>
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/// <returns></returns>
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///
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/// <seealso cref="SecurityUtil.EncodeBase64(string,Encoding)">
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/// 参看SecurityUtil.EncodeBase64(string,Encoding)方法的说明 </seealso>
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public static string EncodeBase64(string source)
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{
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return EncodeBase64(source, Encoding.UTF8);
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}
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/// <summary>
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/// DES加密
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/// </summary>
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/// <param name="str">需要加密的字符串</param>
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/// <param name="key">密钥</param>
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/// <param name="iv">偏移量</param>
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/// <returns>加密后的密文</returns>
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public static string DesEncrypt(string str, string key, string iv)
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{
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if (str.IsNullOrEmpty() || key.IsNullOrEmpty() || iv.IsNullOrEmpty())
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{
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return null;
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}
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var bKey = new Byte[8];
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Array.Copy(Encoding.UTF8.GetBytes(key.PadRight(8)), bKey, 8);
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var bIv = new Byte[8];
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Array.Copy(Encoding.UTF8.GetBytes(iv.PadRight(8)), bIv, 8);
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var oldbytes = Encoding.UTF8.GetBytes(str);
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using (var dcsp = new DESCryptoServiceProvider())//using(){}:{}语句执行完后会将()中的释放,相当于dcsp.Dispose();
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{
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using (var ms = new MemoryStream())
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{
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var cs = new CryptoStream(ms, dcsp.CreateEncryptor(bKey, bIv), CryptoStreamMode.Write);
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cs.Write(oldbytes, 0, oldbytes.Length);
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cs.FlushFinalBlock();
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var newbytes = ms.ToArray();
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cs.Dispose();//释放cs
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return Convert.ToBase64String(newbytes);
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}
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}
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}
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/// <summary>
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/// DES解密
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/// </summary>
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/// <param name="str">需要解密的密文</param>
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/// <param name="key">密钥</param>
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/// <param name="iv">偏移量</param>
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/// <returns>解密后的字符串</returns>
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public static string DesDecrypt(string str, string key, string iv)
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{
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if (str.IsNullOrEmpty() || key.IsNullOrEmpty() || key.IsNullOrEmpty())
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{
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return null;
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}
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var bKey = new Byte[8];
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Array.Copy(Encoding.UTF8.GetBytes(key.PadRight(8)), bKey, 8);
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var bIv = new Byte[8];
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Array.Copy(Encoding.UTF8.GetBytes(iv.PadRight(8)), bIv, 8);
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var oldbytes = Convert.FromBase64String(str);
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using (var dcsp = new DESCryptoServiceProvider())
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{
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using (var ms = new MemoryStream())
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{
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var cs = new CryptoStream(ms, dcsp.CreateDecryptor(bKey, bIv), CryptoStreamMode.Write);
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cs.Write(oldbytes, 0, oldbytes.Length);
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cs.FlushFinalBlock();
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var newBytes = ms.ToArray();
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cs.Dispose();
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return Encoding.UTF8.GetString(newBytes);
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}
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}
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}
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/// <summary>
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/// AES加密
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/// </summary>
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/// <param name="context">待加密的内容</param>
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/// <param name="keyBytes">加密密钥</param>
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/// <returns></returns>
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public static string AesEncrypt(string context, byte[] keyBytes)
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{
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RijndaelManaged rijndaelCipher = new RijndaelManaged();
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rijndaelCipher.Mode = CipherMode.CBC;
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rijndaelCipher.Padding = PaddingMode.PKCS7;
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rijndaelCipher.KeySize = KeySize;
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rijndaelCipher.BlockSize = KeySize;
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// 加密密钥
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rijndaelCipher.Key = keyBytes;
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rijndaelCipher.IV = IvBytes;
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ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
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byte[] plainText = Encoding.UTF8.GetBytes(context);
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byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);
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return Convert.ToBase64String(cipherBytes);
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}
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/// <summary>
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/// AES解密
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/// </summary>
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/// <param name="context"></param>
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/// <param name="keyBytes"></param>
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/// <returns></returns>
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public static string AesDecrypt(string context, byte[] keyBytes)
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{
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RijndaelManaged rijndaelCipher = new RijndaelManaged();
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rijndaelCipher.Mode = CipherMode.CBC;
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rijndaelCipher.Padding = PaddingMode.PKCS7;
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rijndaelCipher.KeySize = KeySize;
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rijndaelCipher.BlockSize = BlockSize;
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byte[] encryptedData = Convert.FromBase64String(context);
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rijndaelCipher.Key = keyBytes;
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rijndaelCipher.IV = IvBytes;
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ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
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byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
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return Encoding.UTF8.GetString(plainText);
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}
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/// <summary>
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/// Aes加密
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/// </summary>
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/// <param name="str">需要加密的字符串</param>
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/// <param name="key">密钥,长度不够时空格补齐,超过时从左截取</param>
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/// <param name="iv">偏移量,长度不够时空格补齐,超过时从左截取</param>
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/// <param name="keyLenth">秘钥长度,16 24 32</param>
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/// <param name="aesMode">加密模式</param>
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/// <param name="aesPadding">填充方式</param>
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/// <returns></returns>
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public static string AesEncrypt(string str, string key, string iv, int keyLenth = 16, CipherMode aesMode = CipherMode.CBC, PaddingMode aesPadding = PaddingMode.PKCS7)
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{
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//对称加密和分组加密中的四种模式(ECB、CBC、CFB、OFB) 。
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if (str.IsNullOrEmpty() || key.IsNullOrEmpty() || iv.IsNullOrEmpty())
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{
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return null;
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}
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if (!new List<int> { 16, 24, 32 }.Contains(keyLenth))
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{
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return null;//密钥的长度，16位密钥 = 128位，24位密钥 = 192位，32位密钥 = 256位。
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}
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var oldBytes = Encoding.UTF8.GetBytes(str);
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key = key.Length > keyLenth ? key.Substring(0, keyLenth) : key.Length < keyLenth ? key.PadRight(keyLenth) : key;
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iv = iv.Length > 16 ? iv.Substring(0, 16) : iv.Length < 16 ? iv.PadRight(16) : iv;
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var bKey = Encoding.UTF8.GetBytes(key);
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var bIv = Encoding.UTF8.GetBytes(iv);
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var rijalg = new RijndaelManaged
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{
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Mode = aesMode,
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Padding = aesPadding,
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Key = bKey,
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IV = bIv,
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};
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var decryptor = rijalg.CreateEncryptor(rijalg.Key, rijalg.IV);
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var rtByte = decryptor.TransformFinalBlock(oldBytes, 0, oldBytes.Length);
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return Convert.ToBase64String(rtByte);
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}
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/// <summary>
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/// Aes解密
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/// </summary>
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/// <param name="str">需要解密的字符串</param>
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/// <param name="key">密钥,长度不够时空格补齐,超过时从左截取</param>
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/// <param name="iv">偏移量,长度不够时空格补齐,超过时从左截取</param>
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/// <param name="keyLenth">秘钥长度,16 24 32</param>
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/// <param name="aesMode">解密模式</param>
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/// <param name="aesPadding">填充方式</param>
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/// <returns></returns>
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public static string AesDecrypt(string str, string key, string iv, int keyLenth = 16, CipherMode aesMode = CipherMode.CBC, PaddingMode aesPadding = PaddingMode.PKCS7)
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{
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if (str.IsNullOrEmpty() || key.IsNullOrEmpty() || iv.IsNullOrEmpty())
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{
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return null;
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}
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if (!new List<int> { 16, 24, 32 }.Contains(keyLenth))
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{
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return null;//密钥的长度，16位密钥 = 128位，24位密钥 = 192位，32位密钥 = 256位。
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}
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var oldBytes = Convert.FromBase64String(str);
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key = key.Length > keyLenth ? key.Substring(0, keyLenth) : key.Length < keyLenth ? key.PadRight(keyLenth) : key;
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iv = iv.Length > 16 ? iv.Substring(0, 16) : iv.Length < 16 ? iv.PadRight(16) : iv;
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var bKey = Encoding.UTF8.GetBytes(key);
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var bIv = Encoding.UTF8.GetBytes(iv);
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var rijalg = new RijndaelManaged
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{
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Mode = aesMode,
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Padding = aesPadding,
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Key = bKey,
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IV = bIv,
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};
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var decryptor = rijalg.CreateDecryptor(rijalg.Key, rijalg.IV);
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var rtByte = decryptor.TransformFinalBlock(oldBytes, 0, oldBytes.Length);
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return Encoding.UTF8.GetString(rtByte);
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}
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/// <summary>
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/// MD5加密
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/// </summary>
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/// <param name="str">明文</param>
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/// <param name="isBase64">密文采用Base64还是等效16进制字符串</param>
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/// <returns>密文</returns>
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public static string MD5Encrypt(string str, bool isBase64 = false)
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{
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if (str.IsNullOrEmpty())
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{
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return null;
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}
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var oldBytes = Encoding.UTF8.GetBytes(str);
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MD5 md5 = new MD5CryptoServiceProvider();
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var newBytes = md5.ComputeHash(oldBytes);
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var result = isBase64 ? Convert.ToBase64String(newBytes) : BitConverter.ToString(newBytes).Replace("-", "");
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return result;
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}
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/// <summary>
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/// MD5加密
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/// </summary>
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/// <param name="str">明文</param>
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/// <returns>密文</returns>
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public static byte[] MD5Encrypt(string str)
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{
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MD5 md5 = MD5.Create();
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byte[] bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(str));
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return bytes;
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}
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/// <summary>
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/// HmacMD5加密
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/// </summary>
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/// <param name="encryptText"></param>
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/// <param name="encryptKey"></param>
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/// <returns></returns>
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public static byte[] HmacMD5Encrypt(String encryptText, byte[] encryptKey)
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{
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HMACMD5 hmac = new HMACMD5(encryptKey);
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byte[] bytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(encryptText));
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return bytes;
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}
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/// <summary>
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/// 生成BASE64(H_MAC)
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/// </summary>
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/// <param name="encryptText">被签名的字符串</param>
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/// <param name="encryptKey">秘钥</param>
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/// <returns></returns>
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public static string HmacMD5EncryptToBase64(string encryptText, byte[] encryptKey)
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{
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return Convert.ToBase64String(HmacMD5Encrypt(encryptText, encryptKey));
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}
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/// <summary>
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/// 生成BASE64(H_MAC),压缩H_MAC值
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/// </summary>
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/// <param name="encryptText"></param>
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/// <param name="encryptKey"></param>
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/// <param name="compressLen"></param>
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/// <returns></returns>
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public static string HmacMD5EncryptToBase64(string encryptText, byte[] encryptKey, int compressLen)
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{
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return Convert.ToBase64String(Compress(HmacMD5Encrypt(encryptText, encryptKey), compressLen));
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}
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/// <summary>
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/// 签名.MD5加密，32位大写
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/// </summary>
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/// <param name="parameters"></param>
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/// <param name="secret"></param>
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/// <returns></returns>
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public static string SignRequest(IDictionary<string, string> parameters, string secret)
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{
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// 第一步：把字典按Key的字母顺序排序
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IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(parameters, StringComparer.Ordinal);
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// 第二步：把所有参数名和参数值串在一起
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StringBuilder query = new StringBuilder();
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query.Append(secret);
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foreach (KeyValuePair<string, string> kv in sortedParams)
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{
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if (!string.IsNullOrEmpty(kv.Key) && !string.IsNullOrEmpty(kv.Value))
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{
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query.Append(kv.Key).Append(kv.Value);
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}
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}
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query.Append(secret);
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// 第三步：MD5加密
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byte[] bytes = MD5Encrypt(query.ToString());
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// 第四步：把二进制转化为大写的十六进制
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StringBuilder result = new StringBuilder();
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for (int i = 0; i < bytes.Length; i++)
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{
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result.Append(bytes[i].ToString("X2"));
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}
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return result.ToString();
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}
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}
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}
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