Ejemplo n.º 1
0
        private static string SecureInput(Dictionary <string, object> header, Dictionary <string, object> payload)
        {
            string encodeHeader  = UrlBase64.Encode(Encoding.UTF8.GetBytes(JSON.Serialize(header)));
            string encodePayload = UrlBase64.Encode(Encoding.UTF8.GetBytes(JSON.Serialize(payload)));

            return(String.Format("{0}.{1}", encodeHeader, encodePayload));
        }
Ejemplo n.º 2
0
        /// <summary>
        /// Generates a Jws Signature.
        /// </summary>
        /// <param name="header"></param>
        /// <param name="payload"></param>
        /// <returns></returns>
        public string GenerateSignature(Dictionary <string, object> header, Dictionary <string, object> payload)
        {
            string securedInput = SecureInput(header, payload);

            byte[] message = Encoding.UTF8.GetBytes(securedInput);

            using (var sha256Hasher = SHA256.Create())
            {
                byte[] hashedMessage = sha256Hasher.ComputeHash(message);

                ECDsaSigner signer = new ECDsaSigner();
                signer.Init(true, _privateKey);
                BigInteger[] results = signer.GenerateSignature(hashedMessage);

                // Concated to create signature
                var a = results[0].ToByteArrayUnsigned();
                var b = results[1].ToByteArrayUnsigned();

                // a,b are required to be exactly the same length of bytes
                if (a.Length != b.Length)
                {
                    int largestLength = Math.Max(a.Length, b.Length);
                    a = ByteArrayPadLeft(a, largestLength);
                    b = ByteArrayPadLeft(b, largestLength);
                }

                string signature = UrlBase64.Encode(a.Concat(b).ToArray());
                return(String.Format("{0}.{1}", securedInput, signature));
            }
        }