在.NET框架下计算SHA1/SHA512

CryptoServiceProvider - .NET下计算SHAx

1 example

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Web;
using System.Web.Hosting;

namespace Core.Common
{
    /// <summary>
    /// SHAUtility provides SHA hash functions for caculating signature/digest.
    /// </summary>
    public static class SHAUtility
    {
        /// <summary>
        /// Compute SHA1 of a Stream instance, return the hex content string
        /// </summary>
        /// <param name="stream"></param>
        /// <returns></returns>
        public static string SHA1Hash(Stream stream)
        {
            SHA1 sha1 = new SHA1CryptoServiceProvider();

            stream.Seek(0, SeekOrigin.Begin);
            string sha1Str = BitConverter.ToString(sha1.ComputeHash(stream)).Replace("-", "");   // get SHA1 file hash as a hex string
            stream.Seek(0, SeekOrigin.Begin);

            return sha1Str;
        }

        /// <summary>
        /// Compute SHA1 of a file, return the hex content string
        /// </summary>
        /// <param name="virtualFilePath"></param>
        /// <returns></returns>
        public static string SHA1Hash(string virtualFilePath)
        {
            if (FilePathUtility.IsExisted(virtualFilePath))
            {
                FileStream fs = File.OpenRead(HostingEnvironment.MapPath(virtualFilePath));
                string sha1Hash = SHA1Hash(fs);
                fs.Close();
                return sha1Hash;
            }
            return "";
        }

        /// <summary>
        /// Compute SHA1 of a HttpPostedFileBase instance, return the hex content string
        /// </summary>
        /// <param name="fileBase"></param>
        /// <returns></returns>
        public static string SHA1Hash(HttpPostedFileBase fileBase)
        {
            return SHA1Hash(fileBase.InputStream);
        }

        /// <summary>
        /// Compute SHA512 of a string (mainly for hashing a password)
        /// </summary>
        /// <param name="plainText"></param>
        /// <returns></returns>
        public static string SHA512Hash(string plainText)
        {
            byte[] data = ASCIIEncoding.ASCII.GetBytes(plainText);
            SHA512 sha512 = new SHA512CryptoServiceProvider();
            byte[] result = sha512.ComputeHash(data);

            return BitConverter.ToString(result).Replace("-", "");
        }
    }
}