C# 常用的加密代码参考

1、MD5加密

 public static string EncryptString(string source)
         {
             string result;
             if (source == string.Empty || source == null)
             {
                 result = string.Empty;
             }
             else
             {
                 Encoding utf = new UTF8Encoding();
                 byte[] bytes = utf.GetBytes(source);
                 MD5 md5 = new MD5CryptoServiceProvider();
                 result = Convert.ToBase64String(md5.ComputeHash(bytes));
             }
             return result;
         }

2、 SHA_1加密

 public static string EncryptString(string source)
         {
             string result;
             if (source == "" || source == string.Empty || source == null)
             {
                 result = source;
             }
             else
             {
                 Encoding utf = new UTF8Encoding();
                 byte[] bytes = utf.GetBytes(source);
                 SHA1 sha = new SHA1CryptoServiceProvider();
                 result = Convert.ToBase64String(sha.ComputeHash(bytes));
             }
             return result;
         }

3、对称加密示例

 private static readonly string key = "sajdkfj";

         private static readonly byte[] iv = new byte[]
         {
             ,
             ,
             ,
             ,
             ,
             ,
             ,

         };

         public static string EncryptString(string source)
         {
             string result;
             if (source == string.Empty || source == null)
             {
                 result = source;
             }
             else
             {
                 Encoding utf = new UTF8Encoding();
                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                 ICryptoTransform encrpt = des.CreateEncryptor(utf.GetBytes(SymmetricEncryption.key), SymmetricEncryption.iv);
                 byte[] byteMessage = utf.GetBytes(source);
                 byte[] byteEncrpt = encrpt.TransformFinalBlock(byteMessage, , byteMessage.Length);
                 result = Convert.ToBase64String(byteEncrpt);
             }
             return result;
         }

         public static string DecryptString(string source)
         {
             Encoding utf = new UTF8Encoding();
             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
             ICryptoTransform decrpt = des.CreateDecryptor(utf.GetBytes(SymmetricEncryption.key), SymmetricEncryption.iv);
             byte[] byteEncrypt = Convert.FromBase64String(source);
             byte[] byteDecrypt = decrpt.TransformFinalBlock(byteEncrypt, , byteEncrypt.Length);
             return utf.GetString(byteDecrypt);
         }

4、非对称加密

 public const string PUBLIC_KEY = "sdfasdfjsldkjfljLKjlkjaslkdj";

         public void RSAKey(out string privateKeys, out string publicKey)
         {
             RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
             privateKeys = rsa.ToXmlString(true);
             publicKey = rsa.ToXmlString(false);
         }

         public string RSAEncrypt(string publicKey, string strEncryptString)
         {
             byte[] plainTextBArray = new UnicodeEncoding().GetBytes(strEncryptString);
             return this.RSAEncrypt(publicKey, plainTextBArray);
         }

         public string RSAEncrypt(string publicKey, byte[] encryptString)
         {
             RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
             rsa.FromXmlString(publicKey);
             int keySize = rsa.KeySize / ;
             int bufferSize = keySize - ;
             byte[] buffer = new byte[bufferSize];
             MemoryStream msInput = new MemoryStream(encryptString);
             MemoryStream msOutput = new MemoryStream();
             for (int readLen = msInput.Read(buffer, , bufferSize); readLen > ; readLen = msInput.Read(buffer, , bufferSize))
             {
                 byte[] dataToEnc = new byte[readLen];
                 Array.Copy(buffer, , dataToEnc, , readLen);
                 byte[] encData = rsa.Encrypt(dataToEnc, false);
                 msOutput.Write(encData, , encData.Length);
             }
             msInput.Close();
             byte[] cypherTextBArray = msOutput.ToArray();
             msOutput.Close();
             rsa.Clear();
             return Convert.ToBase64String(cypherTextBArray);
         }

         public string RSADecrypt(string privateKey, string strDecryptString)
         {
             byte[] plainTextBArray = Convert.FromBase64String(strDecryptString);
             return this.RSADecrypt(privateKey, plainTextBArray);
         }

         public string RSADecrypt(string privateKey, byte[] decryptString)
         {
             RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
             rsa.FromXmlString(privateKey);
             int keySize = rsa.KeySize / ;
             byte[] buffer = new byte[keySize];
             MemoryStream msInput = new MemoryStream(decryptString);
             MemoryStream msOutput = new MemoryStream();
             for (int readLen = msInput.Read(buffer, , keySize); readLen > ; readLen = msInput.Read(buffer, , keySize))
             {
                 byte[] dataToDec = new byte[readLen];
                 Array.Copy(buffer, , dataToDec, , readLen);
                 byte[] decData = rsa.Decrypt(dataToDec, false);
                 msOutput.Write(decData, , decData.Length);
             }
             msInput.Close();
             byte[] dypherTextBArray = msOutput.ToArray();
             msOutput.Close();
             rsa.Clear();
             return new UnicodeEncoding().GetString(dypherTextBArray);
         }

         public bool GetHash(string strSource, ref byte[] HashData)
         {
             HashAlgorithm MD5 = HashAlgorithm.Create("MD5");
             byte[] Buffer = Encoding.GetEncoding("GB2312").GetBytes(strSource);
             HashData = MD5.ComputeHash(Buffer);
             return true;
         }

         public string GetHash(string strSource)
         {
             HashAlgorithm MD5 = HashAlgorithm.Create("MD5");
             byte[] Buffer = Encoding.GetEncoding("GB2312").GetBytes(strSource);
             byte[] HashData = MD5.ComputeHash(Buffer);
             return Convert.ToBase64String(HashData);
         }

         public void SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, out byte[] EncryptedSignatureData)
         {
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPrivate);
             RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);
             RSAFormatter.SetHashAlgorithm("MD5");
             EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
         }

         public void SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, out string m_strEncryptedSignatureData)
         {
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPrivate);
             RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);
             RSAFormatter.SetHashAlgorithm("MD5");
             byte[] EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
             m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
         }

         public void SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, out byte[] EncryptedSignatureData)
         {
             byte[] HashbyteSignature = Convert.FromBase64String(this.GetHash(m_strHashbyteSignature));
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPrivate);
             RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);
             RSAFormatter.SetHashAlgorithm("MD5");
             EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
         }

         public void SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, out string m_strEncryptedSignatureData)
         {
             byte[] HashbyteSignature = Convert.FromBase64String(this.GetHash(m_strHashbyteSignature));
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPrivate);
             RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);
             RSAFormatter.SetHashAlgorithm("MD5");
             byte[] EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
             m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
         }

         public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
         {
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPublic);
             RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);
             RSADeformatter.SetHashAlgorithm("MD5");
             return RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData);
         }

         public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, byte[] DeformatterData)
         {
             byte[] HashbyteDeformatter = Convert.FromBase64String(this.GetHash(p_strHashbyteDeformatter));
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPublic);
             RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);
             RSADeformatter.SetHashAlgorithm("MD5");
             return RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData);
         }

         public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, string p_strDeformatterData)
         {
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPublic);
             RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);
             RSADeformatter.SetHashAlgorithm("MD5");
             byte[] DeformatterData = Convert.FromBase64String(p_strDeformatterData);
             return RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData);
         }

         public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, string p_strDeformatterData)
         {
             byte[] HashbyteDeformatter = Convert.FromBase64String(this.GetHash(p_strHashbyteDeformatter));
             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
             RSA.FromXmlString(p_strKeyPublic);
             RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);
             RSADeformatter.SetHashAlgorithm("MD5");
             byte[] DeformatterData = Convert.FromBase64String(p_strDeformatterData);
             return RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData);
         }