• C# Signature Generator
  • SignatureGenerator.cs

#C# Signature Generator

#SignatureGenerator.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace SignatureGenerator
{
    public interface ISignature
    {
        string Hash { get; set; }
        string Salt { get; set; }
    }

    public class SignatureGenerator
    {
        public ISignature Generate(string url, object parameters, string secret, string salt = "")
        {
            var uri = new Uri(url);
            var path = uri.AbsolutePath;

            var values = GetValues(parameters);
            var toSign = path + string.Join("", values) + salt;

            var hash = HmacSha256(toSign, Encoding.UTF8.GetBytes(secret));

            return new ISignature
            {
                Hash = hash,
                Salt = salt
            };
        }

        private IEnumerable<string> GetValues(object obj)
        {
            var values = new List<string>();

            obj = (obj.GetType()
                .GetProperties()
                .OrderBy(x => x.Name)
                .ToDictionary(x => x.Name, x => x.GetValue(obj, null)));

            foreach (var kvp in obj as Dictionary<string, object>)
            {
                var value = kvp.Value;
                if (value is IEnumerable<object> || value is object)
                {
                    values.AddRange(GetValues(value));
                    continue;
                }

                if (value is bool)
                {
                    values.Add((bool)value ? "1" : "0");
                    continue;
                }

                values.Add(value != null ? value.ToString() : "");
            }

            return values;
        }

        private string HmacSha256(string message, byte[] key)
        {
            using (var hmac = new HMACSHA256(key))
            {
                var msgBuffer = Encoding.UTF8.GetBytes(message);
                var hashBuffer = hmac.ComputeHash(msgBuffer);
                var hashArray = hashBuffer.Select(b => b.ToString("X2")).ToArray();

                return string.Join("", hashArray);
            }
        }
    }
}