【转】asp.net(c#)加密解密算法之sha1、md5、des、aes实现源码详解
原文地址:http://docode.top/Article/Detail/10003
目录:
5、总结
一、.Net(C#)平台下Des加密解密源代码:
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public class DesEncryptHelper { /// <summary> /// Des默认密钥向量 /// </summary> public static string DesIv { get { return "20160602" ; // 此处可自定义,8个字符长度 } } /// <summary> /// Des加解密钥必须8位 /// </summary> public static string DesKey { get { return "20160602" ; // 此处可自定义,8个字符长度 } } /// <summary> /// 获取Des8位密钥 /// </summary> /// <param name="key">Des密钥字符串</param> /// <param name="encoding">编码类型</param> /// <returns>Des8位密钥</returns> static byte [] GetDesKey( string key, Encoding encoding) { if ( string .IsNullOrEmpty(key)) { throw new ArgumentNullException( "key" , "Des密钥不能为空" ); } if (key.Length > 8) { key = key.Substring(0, 8); } if (key.Length < 8) { // 不足8补全 key = key.PadRight(8, '0' ); } return encoding.GetBytes(key); } /// <summary> /// Des加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的字符串</returns> public string EncryptDes( string source, Encoding encoding = null ) { return EncryptDes(source, DesKey, DesIv, encoding); } /// <summary> /// Des加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="key">des密钥,长度必须8位</param> /// <param name="iv">密钥向量</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的字符串</returns> public static string EncryptDes( string source, string key, string iv, Encoding encoding = null ) { if (encoding == null ) encoding = Encoding.UTF8; byte [] rgbKeys = GetDesKey(key, encoding), rgbIvs = GetDesKey(iv, encoding), inputByteArray = encoding.GetBytes(source); using (DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider()) { using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, desProvider.CreateEncryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write)) { cryptoStream.Write(inputByteArray, 0, inputByteArray.Length); // 1.第一种 cryptoStream.FlushFinalBlock(); cryptoStream.Close(); memoryStream.Flush(); memoryStream.Close(); desProvider.Clear(); string result = Convert.ToBase64String(memoryStream.ToArray()); return result; // 2.第二种 //StringBuilder result = new StringBuilder(); //foreach (byte b in memoryStream.ToArray()) //{ // result.AppendFormat("{0:X2}", b); //} //cryptoStream.FlushFinalBlock(); //cryptoStream.Close(); //memoryStream.Flush(); //memoryStream.Close(); //desProvider.Clear(); //return result.ToString(); } } } } /// <summary> /// Des解密 /// </summary> /// <param name="source">源字符串</param> /// <param name="encoding">编码类型</param> /// <returns>解密后的字符串</returns> public static string DecryptDes( string source, Encoding encoding = null ) { return DecryptDes(source, DesKey, DesIv, encoding); } /// <summary> /// Des解密 /// </summary> /// <param name="source">源字符串</param> /// <param name="key">des密钥,长度必须8位</param> /// <param name="iv">密钥向量</param> /// <param name="encoding">编码类型</param> /// <returns>解密后的字符串</returns> public static string DecryptDes( string source, string key, string iv, Encoding encoding = null ) { if (encoding == null ) encoding = Encoding.UTF8; byte [] rgbKeys = GetDesKey(key, encoding), rgbIvs = GetDesKey(iv, encoding), inputByteArray = Convert.FromBase64String(source); using (DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider()) { using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, desProvider.CreateDecryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write)) { cryptoStream.Write(inputByteArray, 0, inputByteArray.Length); cryptoStream.FlushFinalBlock(); cryptoStream.Close(); memoryStream.Flush(); memoryStream.Close(); desProvider.Clear(); byte [] result = memoryStream.ToArray(); return encoding.GetString(result); } } } } } |
二、.Net(C#)平台下Aes加密解密源代码:
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public class AesEncryptHelper { /// <summary> /// Aes加解密钥必须32位 /// </summary> public static string AesKey { get { return "asekey32w" ; // 此处可自定义,32个字符长度 } } /// <summary> /// 获取Aes32位密钥 /// </summary> /// <param name="key">Aes密钥字符串</param> /// <param name="encoding">编码类型</param> /// <returns>Aes32位密钥</returns> static byte [] GetAesKey( string key, Encoding encoding) { if ( string .IsNullOrEmpty(key)) { throw new ArgumentNullException( "key" , "Aes密钥不能为空" ); } if (key.Length < 32) { // 不足32补全 key = key.PadRight(32, '0' ); } if (key.Length > 32) { key = key.Substring(0, 32); } return encoding.GetBytes(key); } /// <summary> /// Aes加密 /// </summary> /// <param name="source">源字符串</param> /// <returns>加密后的字符串</returns> public static string EncryptAes( string source) { return EncryptAes(source, AesKey); } /// <summary> /// Aes加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="key">aes密钥,长度必须32位</param> /// <param name="model">运算模式</param> /// <param name="padding">填充模式</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的字符串</returns> public static string EncryptAes( string source, string key, CipherMode model = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding encoding = null ) { if (encoding == null ) encoding = Encoding.UTF8; using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider()) { aesProvider.Key = GetAesKey(key, encoding); aesProvider.Mode = model; aesProvider.Padding = padding; using (ICryptoTransform cryptoTransform = aesProvider.CreateEncryptor()) { byte [] inputBuffers = encoding.GetBytes(source), results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length); aesProvider.Clear(); return Convert.ToBase64String(results, 0, results.Length); } } } /// <summary> /// Aes解密 /// </summary> /// <param name="source">源字符串</param> /// <returns>解密后的字符串</returns> public static string DecryptAes( string source) { return DecryptAes(source, AesKey); } /// <summary> /// Aes解密 /// </summary> /// <param name="source">源字符串</param> /// <param name="key">aes密钥,长度必须32位</param> /// <param name="model">运算模式</param> /// <param name="padding">填充模式</param> /// <param name="encoding">编码类型</param> /// <returns>解密后的字符串</returns> public static string DecryptAes( string source, string key, CipherMode model = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding encoding = null ) { if (encoding == null ) encoding = Encoding.UTF8; using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider()) { aesProvider.Key = GetAesKey(key, encoding); aesProvider.Mode = model; aesProvider.Padding = padding; using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor()) { byte [] inputBuffers = Convert.FromBase64String(source); byte [] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length); aesProvider.Clear(); return encoding.GetString(results); } } } } |
三、.Net(C#)平台下Sha1加密解密源代码:
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/// <summary> /// 对字符串SHA1加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的十六进制字符串</returns> public static string Sha1Encrypt( string source, Encoding encoding = null ) { if (encoding == null ) encoding = Encoding.UTF8; // 第一种方式 byte [] byteArray = encoding.GetBytes(source); using (HashAlgorithm hashAlgorithm = new SHA1CryptoServiceProvider()) { byteArray = hashAlgorithm.ComputeHash(byteArray); StringBuilder stringBuilder = new StringBuilder(256); foreach ( byte item in byteArray) { stringBuilder.AppendFormat( "{0:x2}" , item); } hashAlgorithm.Clear(); return stringBuilder.ToString(); } //// 第二种方式 //using (SHA1 sha1 = SHA1.Create()) //{ // byte[] hash = sha1.ComputeHash(encoding.GetBytes(source)); // StringBuilder stringBuilder = new StringBuilder(); // for (int index = 0; index < hash.Length; ++index) // stringBuilder.Append(hash[index].ToString("x2")); // sha1.Clear(); // return stringBuilder.ToString(); //} } |
四、.Net(C#)平台下MD5加密解密源代码:
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/// <summary> /// 对字符串md5加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的十六进制字符串</returns> public static string Md5Encrypt( string source, Encoding encoding = null ) { if (encoding == null ) encoding = Encoding.UTF8; byte [] byteArray = encoding.GetBytes(source); using (HashAlgorithm hashAlgorithm = new MD5CryptoServiceProvider()) { byteArray = hashAlgorithm.ComputeHash(byteArray); StringBuilder stringBuilder = new StringBuilder(); foreach ( byte item in byteArray) { stringBuilder.AppendFormat( "{0:x2}" , item); } hashAlgorithm.Clear(); return stringBuilder.ToString(); } } |
五、总结:
1、.Net(C#)加密解密使用的类均存在System.Security.Cryptography命名空间下,使用时需先引用。
2、.Net(C#)加密解密类或者其父类都实现IDispose接口,因此需要通过using包裹起来(或者采用.net异常处理机制try catch finally),在使用完后销毁对象。