★ 封装了MD5，SHA1等加密算法的类

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using  System; using  System.Collections.Generic; using  System.Text; using  System.Security.Cryptography; namespace  trips ... {     static class CryptClass     ...{         public enum HashType : int         ...{             SHA1,             SHA256,             SHA384,             SHA512,             MD5,             RIPEMD160         }         public static string FromString(string input, HashType hashtype)         ...{             Byte[] clearBytes;             Byte[] hashedBytes;             string output = String.Empty;             switch (hashtype)             ...{                 case HashType.RIPEMD160:                     clearBytes = new UTF8Encoding().GetBytes(input);                     RIPEMD160 myRIPEMD160 = RIPEMD160Managed.Create();                     hashedBytes = myRIPEMD160.ComputeHash(clearBytes);                     output = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower();                     break;                 case HashType.MD5:                     clearBytes = new UTF8Encoding().GetBytes(input);                     hashedBytes = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes);                     output = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower();                     break;                 case HashType.SHA1:                     clearBytes = Encoding.UTF8.GetBytes(input);                     SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();                     sha1.ComputeHash(clearBytes);                     hashedBytes = sha1.Hash;                     sha1.Clear();                     output = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower();                     break;                 case HashType.SHA256:                     clearBytes = Encoding.UTF8.GetBytes(input);                     SHA256 sha256 = new SHA256Managed();                     sha256.ComputeHash(clearBytes);                     hashedBytes = sha256.Hash;                     sha256.Clear();                     output = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower();                     break;                 case HashType.SHA384:                     clearBytes = Encoding.UTF8.GetBytes(input);                     SHA384 sha384 = new SHA384Managed();                     sha384.ComputeHash(clearBytes);                     hashedBytes = sha384.Hash;                     sha384.Clear();                     output = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower();                     break;                 case HashType.SHA512:                     clearBytes = Encoding.UTF8.GetBytes(input);                     SHA512 sha512 = new SHA512Managed();                     sha512.ComputeHash(clearBytes);                     hashedBytes = sha512.Hash;                     sha512.Clear();                     output = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower();                     break;             }             return output;         }     } }

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