SHA1l加密

public static string SHA1Encrypt(string sourceText)
       {
           SHA1 sha = new SHA1CryptoServiceProvider();
           ASCIIEncoding enc = new ASCIIEncoding();
           byte[] dataToHash = enc.GetBytes(sourceText);
           byte[] dataHashed = sha.ComputeHash(dataToHash);
           string hash = BitConverter.ToString(dataHashed).Replace("-", "");
           return hash;
       }