网站首页 博客 C#计算SHA1加密和base64编码
调用方法:
Md5SHA1Helper md5helper = new Md5SHA1Helper(); string filepath = @"E:\Release\test.txt"; string sha1value = md5helper.SHA1File(filepath); string base64value = md5helper.EncodeBase64("utf-8", sha1value); textBox1.Text = "文件:" + filepath + "\r\nSHA1值:" + sha1value + "\r\nbase64值:" + base64value;
辅助类定义:
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace FileMd5SHA1 { public class Md5SHA1Helper { /// <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("-", ""); } ///base64编码 public string EncodeBase64(string code_type, string code) { string encode = ""; byte[] bytes = Encoding.GetEncoding(code_type).GetBytes(code); try { encode = Convert.ToBase64String(bytes); } catch { encode = code; } return encode; } ///base64解码 public string DecodeBase64(string code_type, string code) { string decode = ""; byte[] bytes = Convert.FromBase64String(code); try { decode = Encoding.GetEncoding(code_type).GetString(bytes); } catch { decode = code; } return decode; } } }