Hasher.cs

    public class HashProvider
    {
        readonly SHA1Managed Hasher;
        public HashProvider()
        {
            this.Hasher = new SHA1Managed();
        }

        public string GenerateHash(string data)
        {
            var originalBytes = Encoding.ASCII.GetBytes(data);
            var hashedBytes = Hasher.ComputeHash(originalBytes);

            var builder = new StringBuilder();
            foreach (Byte hashed in hashedBytes)
                builder.AppendFormat("{0:x2}", hashed);

            return builder.ToString();
        }
    }