Hash by SHA1

gistfile1.txt

byte[] HashSHA1(string phrase)
{
    if (phrase == null)
        return null;
    var encoder = new UTF8Encoding();
    var sha1Hasher = new SHA1CryptoServiceProvider();
    var hashedDataBytes = sha1Hasher.ComputeHash(encoder.GetBytes(phrase));
    return hashedDataBytes;
}