NetSkycn.Security/SHA256Provider.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;

namespace NetSkycn.Security
{
    /// <summary>
    /// 采用SHA256进行Hash计算的类，采用此算法的Hash值大小为256位
    /// </summary>
    public sealed class SHA256Provider
    {
        private SHA256Provider()
        {
        }
        /// <summary>
        /// 采用UTF8编码对字符串进行SHA1加密
        /// </summary>
        /// <param name="sourceString">要加密的字符串</param>
        /// <returns></returns>
        public static string SHA256Hash(string sourceString)
        {
            return SHA256Hash(sourceString, Encoding.UTF8);
        }
        /// <summary>
        /// 采用自定义编码对字符串进行SHA1加密
        /// </summary>
        /// <param name="sourceString">要加密的字符串</param>
        /// <param name="encoding">指定的编码实例</param>
        /// <returns></returns>
        public static string SHA256Hash(string sourceString, Encoding encoding)
        {
            if (string.IsNullOrEmpty(sourceString))
            {
                throw new ArgumentNullException("sourceString", "不能为空");
            }
            SHA256 sha256 = new SHA256Managed();
            byte[] byteSource = encoding.GetBytes(sourceString);
            sha256.ComputeHash(byteSource);
            StringBuilder sBuilder = new StringBuilder();
            for (int i = 0; i < byteSource.Length; i++)
            {
                sBuilder.Append(byteSource[i].ToString("x"));
            }
            return sBuilder.ToString();
        }
    }
}