c#.net4.0 实现HMAC-SHA1加密算法

using System.Security.Cryptography;

/// <summary>
        /// HMAC-SHA1加密算法
        /// </summary>
        /// <param name="key">密钥</param>
        /// <param name="input">要加密的串</param>
        /// <returns></returns>
        public static string HmacSha1(string key,string input)
        {
            byte[] keyBytes = ASCIIEncoding.ASCII.GetBytes(key);
            byte[] inputBytes = ASCIIEncoding.ASCII.GetBytes(input);
            HMACSHA1 hmac = new HMACSHA1(keyBytes);
            byte[] hashBytes = hmac.ComputeHash(inputBytes);
            return Convert.ToBase64String(hashBytes);
        }