1、加密解密工具类(MD5,DES,AES,Base64,SHA256)
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace cjavapy.helper
{
/// <summary>
/// 加、解密帮助类
/// </summary>
public static class Cryptography
{
/// <summary>
/// 计算32位MD5
/// </summary>
/// <param name="str">需要计算的字符串</param>
/// <returns>32位的MD5值</returns>
public static string ToMd5(this string str)
{
var bytes = Encoding.UTF8.GetBytes(str);
return bytes.ToMd5();
}
public static string ToMd5(this byte[] bytes)
{
#if !NETSTANDARD
var md5 = new MD5CryptoServiceProvider();
#else
var md5 = MD5.Create();
#endif
var targetData = md5.ComputeHash(bytes);
return BitConverter.ToString(targetData).Replace("-", "").ToLower();
}
/// <summary>
/// 计算8位MD5
/// </summary>
/// <param name="str">需要计算的字符串</param>
/// <returns>8位的MD5值</returns>
public static string ToShortMd5(this string str)
{
return ToMd5(str).Substring(8, 16).ToLower();
}
/// <summary>
/// DES加密
/// </summary>
/// <param name="key">秘钥</param>
/// <param name="str">需要加密的字符串</param>
/// <returns>加密后的字符串</returns>
public static string ToDes(string key, string str)
{
var cryptoProvider = new DESCryptoServiceProvider();
var bytes = Encoding.ASCII.GetBytes(key);
var crypto = cryptoProvider.CreateEncryptor(bytes, bytes);
var ms = new MemoryStream();
var cst = new CryptoStream(ms, crypto, CryptoStreamMode.Write);
var sw = new StreamWriter(cst);
sw.Write(str);
sw.Flush();
cst.FlushFinalBlock();
sw.Flush();
return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
}
#region Base64加密解密
/// <summary>
/// Base64是一種使用64基的位置計數法。它使用2的最大次方來代表僅可列印的ASCII 字元。
/// 這使它可用來作為電子郵件的傳輸編碼。在Base64中的變數使用字元A-Z、a-z和0-9 ，
/// 這樣共有62個字元，用來作為開始的64個數字，最後兩個用來作為數字的符號在不同的
/// 系統中而不同。
/// Base64加密
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string Base64Encrypt(this string str)
{
byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str);
return Convert.ToBase64String(encbuff);
}
/// <summary>
/// Base64解密
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string Base64Decrypt(this string str)
{
byte[] decbuff = Convert.FromBase64String(str);
return System.Text.Encoding.UTF8.GetString(decbuff);
}
#endregion
#region SHA256加密算法
/// <summary>
/// SHA256函数
/// </summary>
/// <param name="str">原始字符串</param>
/// <returns>SHA256结果(返回长度为44字节的字符串)</returns>
public static string SHA256(this string str)
{
byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
SHA256Managed Sha256 = new SHA256Managed();
byte[] Result = Sha256.ComputeHash(SHA256Data);
return Convert.ToBase64String(Result); //返回长度为44字节的字符串
}
#endregion
/// <summary>
/// AES加密算法
/// </summary>
/// <param name="input">明文字符串</param>
/// <returns>字符串</returns>
public static string EncryptByAES(string input, string key, string iv)
{
if (string.IsNullOrWhiteSpace(input))
{
return input;
}
using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
{
rijndaelManaged.Mode = CipherMode.CBC;
rijndaelManaged.Padding = PaddingMode.PKCS7;
rijndaelManaged.FeedbackSize = 128;
rijndaelManaged.Key = Encoding.UTF8.GetBytes(key);
rijndaelManaged.IV = Encoding.UTF8.GetBytes(iv);
ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(rijndaelManaged.Key, rijndaelManaged.IV);
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(input);
}
byte[] bytes = msEncrypt.ToArray();
return Convert.ToBase64String(bytes);
}
}
}
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="input">密文字节数组</param>
/// <returns>返回解密后的字符串</returns>
public static string DecryptByAES(string input, string key, string iv)
{
if (string.IsNullOrWhiteSpace(input))
{
return input;
}
var buffer = Convert.FromBase64String(input);
using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
{
rijndaelManaged.Mode = CipherMode.CBC;
rijndaelManaged.Padding = PaddingMode.PKCS7;
rijndaelManaged.FeedbackSize = 128;
rijndaelManaged.Key = Encoding.UTF8.GetBytes(key);
rijndaelManaged.IV = Encoding.UTF8.GetBytes(iv);
ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor(rijndaelManaged.Key, rijndaelManaged.IV);
using (MemoryStream msEncrypt = new MemoryStream(buffer))
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srEncrypt = new StreamReader(csEncrypt))
{
return srEncrypt.ReadToEnd();
}
}
}
}
}
}
}
2、使用示例代码
"www.cjavapy.com".ToMd5();
"www.cjavapy.com".ToShortMd5();
Cryptography.ToDes("cjavapy","hello world!!!");
"www.cjavapy.com".Base64Encrypt();
"www.cjavapy.com".SHA256();
Cryptography.EncryptByAES("137", "CJAVAPmXcuAksWmF", "V33CQ1428SI8ZNMT");
Cryptography.DecryptByAES( "v9BxRJX+ojPDhyJFrglcbA==","CJAVAPmXcuAksWmF","V33CQ1428SI8ZNMT");