Org.BouncyCastle.Crypto.Digests.Sha1Digest.DoFinal C# (CSharp) Method

        public override int DoFinal(
            byte[]  output,
            int     outOff)
        {
            Finish();

            Pack.UInt32_To_BE(H1, output, outOff);
            Pack.UInt32_To_BE(H2, output, outOff + 4);
            Pack.UInt32_To_BE(H3, output, outOff + 8);
            Pack.UInt32_To_BE(H4, output, outOff + 12);
            Pack.UInt32_To_BE(H5, output, outOff + 16);

            Reset();

            return DigestLength;
        }

        internal SecureMimeDigitalCertificate(X509Certificate certificate)
        {
            Certificate = certificate;

            var pubkey = certificate.GetPublicKey ();
            if (pubkey is DsaKeyParameters)
                PublicKeyAlgorithm = PublicKeyAlgorithm.Dsa;
            else if (pubkey is RsaKeyParameters)
                PublicKeyAlgorithm = PublicKeyAlgorithm.RsaGeneral;
            else if (pubkey is ElGamalKeyParameters)
                PublicKeyAlgorithm = PublicKeyAlgorithm.ElGamalGeneral;
            else if (pubkey is ECKeyParameters)
                PublicKeyAlgorithm = PublicKeyAlgorithm.EllipticCurve;
            else if (pubkey is DHKeyParameters)
                PublicKeyAlgorithm = PublicKeyAlgorithm.DiffieHellman;

            var encoded = certificate.GetEncoded ();
            var fingerprint = new StringBuilder ();
            var sha1 = new Sha1Digest ();
            var data = new byte[20];

            sha1.BlockUpdate (encoded, 0, encoded.Length);
            sha1.DoFinal (data, 0);

            for (int i = 0; i < data.Length; i++)
                fingerprint.Append (data[i].ToString ("X2"));

            Fingerprint = fingerprint.ToString ();
        }