在.NET上實作SHA加密

SHA加密有很多種版本，像是SHA1、SHA256….等

下面用一個Function來實作.NET中所有的SHA加密

using System;
using System.Security.Cryptography;
using System.Text;

namespace SystemAPI.Function.EncryptLibrary
{
    public class EncryptSHA
    {
        /// <summary>
        /// 使用SHA加密訊息
        /// </summary>
        /// <param name="sourceMessage">原始資訊</param>
        /// <param name="SHAType">SHA加密方式</param>
        /// <returns>string</returns>
        public string Encrypt(string sourceMessage, EnumSHAType SHAType)
        {
            if (string.IsNullOrEmpty(sourceMessage))
            {
                return string.Empty;
            }

            //字串先轉成byte[]
            byte[] Message = Encoding.Unicode.GetBytes(sourceMessage);
            HashAlgorithm HashImplement = null;

            //選擇要使用的SHA加密方式
            switch (SHAType)
            {
                case  EnumSHAType.SHA1:
                    HashImplement = new SHA1Managed();
                    break;
                case EnumSHAType.SHA256:
                    HashImplement = new SHA256Managed();
                    break;
                case EnumSHAType.SHA384:
                    HashImplement = new SHA384Managed();
                    break;
                case EnumSHAType.SHA512:
                    HashImplement = new SHA512Managed();
                    break;
            }

            //取Hash值
            byte[] HashValue = HashImplement.ComputeHash(Message);

            //把byte[]轉成string後，再回傳
            return BitConverter.ToString(HashValue).Replace("-","").ToLower();

        }

        public enum EnumSHAType
        {
            SHA1,
            SHA256,
            SHA384,
            SHA512
        }

    }
}

.
使用方式如下：

EncryptSHA SHA = new EncryptSHA();
string EncryptString = SHA.Encrypt("12345", EncryptSHA.EnumSHAType.SHA512);