C#中的几种加密算法整理
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Security.Cryptography;
using System.IO;
/// <summary>
///DEncrypt 的摘要说明
/// </summary>
public static class DEncrypt
{
/// <summary>
/// MD5函数
/// </summary>
/// <param name="input">原始字符串</param>
/// <returns>MD5结果</returns>
public static string MD5(string input)
{
byte[] bytes = Encoding.UTF8.GetBytes(input);
bytes = new MD5CryptoServiceProvider().ComputeHash(bytes);
string result = string.Empty;
for (int i = 0; i < bytes.Length; i++)
result += bytes[i].ToString("x").PadLeft(2, '0');
return result;
}
/// <summary>
/// SHA256函数
/// </summary>
/// /// <param name="input">原始字符串</param>
/// <returns>SHA256结果</returns>
public static string SHA256(string input)
{
byte[] data = Encoding.UTF8.GetBytes(input);
SHA256Managed sha256 = new SHA256Managed();
byte[] result = sha256.ComputeHash(data);
return Convert.ToBase64String(result); //返回长度为44字节的字符串
}
//默认密钥向量
private static byte[] AESKeys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };
public static string AESEncode(string input, string key)
{
key = GetSubString(key, 32, string.Empty);
key = key.PadRight(32, ' ');
RijndaelManaged rijndaelProvider = new RijndaelManaged();
rijndaelProvider.Key = Encoding.UTF8.GetBytes(key.Substring(0, 32));
rijndaelProvider.IV = AESKeys;
ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
byte[] inputData = Encoding.UTF8.GetBytes(input);
byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);
return Convert.ToBase64String(encryptedData);
}
public static string AESDecode(string input, string key)
{
try
{
key = GetSubString(key, 32, string.Empty);
key = key.PadRight(32, ' ');
RijndaelManaged rijndaelProvider = new RijndaelManaged();
rijndaelProvider.Key = Encoding.UTF8.GetBytes(key);
rijndaelProvider.IV = AESKeys;
ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
byte[] inputData = Convert.FromBase64String(input);
byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);
return Encoding.UTF8.GetString(decryptedData);
}
catch
{
return string.Empty;
}
}
//默认密钥向量
private static byte[] DESKeys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="input">待加密的字符串</param>
/// <param name="key">加密密钥,要求为8位</param>
/// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
public static string DESEncode(string input, string key)
{
key = GetSubString(key, 8, string.Empty);
key = key.PadRight(8, ' ');
byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));
byte[] rgbIV = DESKeys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(input);
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
MemoryStream memory = new MemoryStream();
CryptoStream stream = new CryptoStream(memory, provider.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
stream.Write(inputByteArray, 0, inputByteArray.Length);
stream.FlushFinalBlock();
return Convert.ToBase64String(memory.ToArray());
}
/// <summary>
/// DES解密字符串
/// </summary>
/// <param name="input">待解密的字符串</param>
/// <param name="key">解密密钥,要求为8位,和加密密钥相同</param>
/// <returns>解密成功返回解密后的字符串,失败返源串</returns>
public static string DESDecode(string input, string key)
{
try
{
key = GetSubString(key, 8, string.Empty);
key = key.PadRight(8, ' ');
byte[] rgbKey = Encoding.UTF8.GetBytes(key);
byte[] rgbIV = DESKeys;
byte[] inputByteArray = Convert.FromBase64String(input);
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
MemoryStream memory = new MemoryStream();
CryptoStream stream = new CryptoStream(memory, provider.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
stream.Write(inputByteArray, 0, inputByteArray.Length);
stream.FlushFinalBlock();
return Encoding.UTF8.GetString(memory.ToArray());
}
catch
{
return string.Empty;
}
}
public static string GetSubString(string input, int length, string pad)
{
return GetSubString(input, 0, length, pad);
}
/// <summary>
/// 取指定长度的字符串
/// </summary>
/// <param name="input">要检查的字符串</param>
/// <param name="start">起始位置</param>
/// <param name="length">指定长度</param>
/// <param name="pad">用于替换的字符串</param>
/// <returns>截取后的字符串</returns>
public static string GetSubString(string input, int start, int length, string pad)
{
string result = input;
Byte[] comments = Encoding.UTF8.GetBytes(input);
foreach (char c in Encoding.UTF8.GetChars(comments))
{ //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3)
if ((c > '\u0800' && c < '\u4e00') || (c > '\xAC00' && c < '\xD7A3'))
{
//if (System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\xAC00-\xD7A3]+"))
//当截取的起始位置超出字段串长度时
if (start >= input.Length)
return string.Empty;
else
return input.Substring(start, ((length + start) > input.Length) ? (input.Length - start) : length);
}
}
if (length >= 0)
{
byte[] bytes = Encoding.Default.GetBytes(input);
//当字符串长度大于起始位置
if (bytes.Length > start)
{
int stopIndex = bytes.Length;
//当要截取的长度在字符串的有效长度范围内
if (bytes.Length > (start + length))
{
stopIndex = length + start;
}
else
{ //当不在有效范围内时,只取到字符串的结尾
length = bytes.Length - start;
pad = string.Empty;
}
int realLength = length;
int[] resultFlag = new int[length];
byte[] byteResult = null;
int flag = 0;
for (int i = start; i < stopIndex; i++)
{
if (bytes[i] > 127)
{
flag++;
if (flag == 3)
flag = 1;
}
else
flag = 0;
resultFlag[i] = flag;
}
if ((bytes[stopIndex - 1] > 127) && (resultFlag[length - 1] == 1))
realLength = length + 1;
byteResult = new byte[realLength];
Array.Copy(bytes, start, byteResult, 0, realLength);
result = Encoding.Default.GetString(byteResult);
result = result + pad;
}
}
return result;
}
}
