C# 输出MD5和SHA1编码
using System; namespace myMethod { class computeMD5andSHA1 { /// <summary> /// 计算文件的 MD5 值 /// </summary> /// <param name="fileName">要计算 MD5 值的文件名和路径</param> /// <returns>MD5 值16进制字符串</returns> public string MD5File(string fileName) { return HashFile(fileName , "md5"); } /// <summary> /// 计算文件的 sha1 值 /// </summary> /// <param name="fileName">要计算 sha1 值的文件名和路径</param> /// <returns>sha1 值16进制字符串</returns> public string SHA1File(string fileName) { return HashFile(fileName , "sha1"); } /// <summary> /// 计算文件的哈希值 /// </summary> /// <param name="fileName">要计算哈希值的文件名和路径</param> /// <param name="algName">算法:sha1,md5</param> /// <returns>哈希值16进制字符串</returns> private string HashFile(string fileName , string algName) { if ( !System.IO.File.Exists(fileName) ) return string.Empty; System.IO.FileStream fs = new System.IO.FileStream(fileName , System.IO.FileMode.Open , System.IO.FileAccess.Read); byte[] hashBytes = HashData(fs , algName); fs.Close(); return ByteArrayToHexString(hashBytes); } /// <summary> /// 计算哈希值 /// </summary> /// <param name="stream">要计算哈希值的 Stream</param> /// <param name="algName">算法:sha1,md5</param> /// <returns>哈希值字节数组</returns> private byte[] HashData(System.IO.Stream stream , string algName) { System.Security.Cryptography.HashAlgorithm algorithm; if ( algName == null ) { throw new ArgumentNullException("algName 不能为 null"); } if ( string.Compare(algName , "sha1" , true) == 0 ) { algorithm = System.Security.Cryptography.SHA1.Create(); } else { if ( string.Compare(algName , "md5" , true) != 0 ) { throw new Exception("algName 只能使用 sha1 或 md5"); } algorithm = System.Security.Cryptography.MD5.Create(); } return algorithm.ComputeHash(stream); } /// <summary> /// 字节数组转换为16进制表示的字符串 /// </summary> private string ByteArrayToHexString(byte[] buf) { return BitConverter.ToString(buf).Replace("-" , ""); } } }