1、MD5加密
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; namespace MyEncrypt { /// <summary> /// 不可逆加密 /// 1 防止被篡改 /// 2 防止明文存储 /// 3 防止抵赖，数字签名 /// </summary> public class MD5Encrypt { #region MD5 /// <summary> /// MD5加密,和动网上的16/32位MD5加密结果相同, /// 使用的UTF8编码 /// </summary> /// <param name="source">待加密字串</param> /// <param name="length">16或32值之一,其它则采用.net默认MD5加密算法</param> /// <returns>加密后的字串</returns> public static string Encrypt(string source, int length = 32)//默认参数 { if (string.IsNullOrEmpty(source)) return string.Empty; HashAlgorithm provider = CryptoConfig.CreateFromName("MD5") as HashAlgorithm; byte[] bytes = Encoding.UTF8.GetBytes(source);//这里需要区别编码的 byte[] hashValue = provider.ComputeHash(bytes); StringBuilder sb = new StringBuilder(); switch (length) { case 16://16位密文是32位密文的9到24位字符 for (int i = 4; i < 12; i++) { sb.Append(hashValue[i].ToString("x2")); } break; case 32: for (int i = 0; i < 16; i++) { sb.Append(hashValue[i].ToString("x2")); } break; default: for (int i = 0; i < hashValue.Length; i++) { sb.Append(hashValue[i].ToString("x2")); } break; } return sb.ToString(); } #endregion MD5 #region MD5摘要 /// <summary> /// 获取文件的MD5摘要 /// </summary> /// <param name="fileName"></param> /// <returns></returns> public static string AbstractFile(string fileName) { using (FileStream file = new FileStream(fileName, FileMode.Open)) { return AbstractFile(file); } } /// <summary> /// 根据stream获取文件摘要 /// </summary> /// <param name="stream"></param> /// <returns></returns> public static string AbstractFile(Stream stream) { MD5 md5 = new MD5CryptoServiceProvider(); byte[] retVal = md5.ComputeHash(stream); StringBuilder sb = new StringBuilder(); for (int i = 0; i < retVal.Length; i++) { sb.Append(retVal[i].ToString("x2")); } return sb.ToString(); } #endregion } }
2、DES对称加密解密
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; namespace MyEncrypt { /// <summary> /// DES AES Blowfish /// 对称加密算法的优点是速度快， /// 缺点是密钥管理不方便，要求共享密钥。 /// 可逆对称加密 密钥长度8 /// </summary> public class DesEncrypt { private static byte[] _rgbKey = ASCIIEncoding.ASCII.GetBytes(Constant.DesKey.Substring(0, 8)); private static byte[] _rgbIV = ASCIIEncoding.ASCII.GetBytes(Constant.DesKey.Insert(0, "w").Substring(0, 8)); /// <summary> /// DES 加密 /// </summary> /// <param name="text">需要加密的值</param> /// <returns>加密后的结果</returns> public static string Encrypt(string text) { DESCryptoServiceProvider dsp = new DESCryptoServiceProvider(); using (MemoryStream memStream = new MemoryStream()) { CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateEncryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write); StreamWriter sWriter = new StreamWriter(crypStream); sWriter.Write(text); sWriter.Flush(); crypStream.FlushFinalBlock(); memStream.Flush(); return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length); } } /// <summary> /// DES解密 /// </summary> /// <param name="encryptText"></param> /// <returns>解密后的结果</returns> public static string Decrypt(string encryptText) { DESCryptoServiceProvider dsp = new DESCryptoServiceProvider(); byte[] buffer = Convert.FromBase64String(encryptText); using (MemoryStream memStream = new MemoryStream()) { CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateDecryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write); crypStream.Write(buffer, 0, buffer.Length); crypStream.FlushFinalBlock(); return ASCIIEncoding.UTF8.GetString(memStream.ToArray()); } } } }
3、RSA非对称加密解密
using Org.BouncyCastle.Crypto; using Org.BouncyCastle.Security; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; namespace MyEncrypt { /// <summary> /// RSA ECC /// 可逆非对称加密 /// 非对称加密算法的优点是密钥管理很方便，缺点是速度慢。 /// </summary> public class RsaEncrypt { /// <summary> /// 获取加密/解密对 /// 给你一个，是无法推算出另外一个的 /// /// Encrypt Decrypt /// </summary> /// <returns>Encrypt Decrypt</returns> public static KeyValuePair<string, string> GetKeyPair() { RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); string publicKey = RSA.ToXmlString(false); string privateKey = RSA.ToXmlString(true); return new KeyValuePair<string, string>(publicKey, privateKey); } /// <summary> /// 加密：内容+加密key /// /// </summary> /// <param name="content"></param> /// <param name="encryptKey">加密key</param> /// <returns></returns> public static string Encrypt(string content, string encryptKey) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.FromXmlString(encryptKey); UnicodeEncoding ByteConverter = new UnicodeEncoding(); byte[] DataToEncrypt = ByteConverter.GetBytes(content); byte[] resultBytes = rsa.Encrypt(DataToEncrypt, false); return Convert.ToBase64String(resultBytes); } /// <summary> /// 解密 内容+解密key /// </summary> /// <param name="content"></param> /// <param name="decryptKey">解密key</param> /// <returns></returns> public static string Decrypt(string content, string decryptKey) { byte[] dataToDecrypt = Convert.FromBase64String(content); RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); RSA.FromXmlString(decryptKey); byte[] resultBytes = RSA.Decrypt(dataToDecrypt, false); UnicodeEncoding ByteConverter = new UnicodeEncoding(); return ByteConverter.GetString(resultBytes); } /// <summary> /// 可以合并在一起的，每次产生一组新的密钥 /// </summary> /// <param name="content"></param> /// <param name="encryptKey">加密key</param> /// <param name="decryptKey">解密key</param> /// <returns>加密后结果</returns> private static string Encrypt(string content, out string publicKey, out string privateKey) { RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(); publicKey = rsaProvider.ToXmlString(false); privateKey = rsaProvider.ToXmlString(true); UnicodeEncoding ByteConverter = new UnicodeEncoding(); byte[] DataToEncrypt = ByteConverter.GetBytes(content); byte[] resultBytes = rsaProvider.Encrypt(DataToEncrypt, false); return Convert.ToBase64String(resultBytes); } } }