// Copyright (c) 2020 Sergey Ivonchik
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.

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

namespace Httx.Utils {
  public static class Crypto {
    public static string Sha256(string s) {
      using (var sha1 = SHA256.Create()) {
        var hashBytes = sha1.ComputeHash(Encoding.UTF8.GetBytes(s));

        return ToHex(hashBytes);
      }
    }

    public static string ToHex(IEnumerable<byte> bytes) {
      var sb = new StringBuilder();

      foreach (var b in bytes) {
        var hex = b.ToString("x2");
        sb.Append(hex);
      }

      return sb.ToString();
    }
  }
}