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

namespace Pithos.Network
{
    public class SHA1OpenSSL : SHA1
    {

        private MessageDigestContext _context;

        public SHA1OpenSSL()
        {
            _context = new MessageDigestContext(MessageDigest.CreateByName("SHA1"));
            _context.Init();
        }

        public override void Initialize()
        {
            _context.Init();
        }

        protected override void HashCore(byte[] array, int ibStart, int cbSize)
        {
            if (array.Length == cbSize)
                _context.Update(array);
            else
            {
                var block = new byte[cbSize];
                Buffer.BlockCopy(array, ibStart, block, 0, cbSize);
                _context.Update(block);
            }
        }

        protected override byte[] HashFinal()
        {
            return _context.DigestFinal();
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            if (disposing)
            {
                if (_context != null)
                    _context.Dispose();
                _context = null;
            }
        }
    }
    
    public class SHA256OpenSSL : SHA256
    {

        private MessageDigestContext _context;

        public SHA256OpenSSL()
        {
            _context = new MessageDigestContext(MessageDigest.CreateByName("SHA256"));
            _context.Init();
        }

        public override void Initialize()
        {
            _context.Init();
        }

        protected override void HashCore(byte[] array, int ibStart, int cbSize)
        {
            if (array.Length == cbSize)
                _context.Update(array);
            else
            {
                var block = new byte[cbSize];
                Buffer.BlockCopy(array, ibStart, block, 0, cbSize);
                _context.Update(block);
            }
        }

        protected override byte[] HashFinal()
        {
            return _context.DigestFinal();
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            if (disposing)
            {
                if (_context != null)
                    _context.Dispose();
                _context = null;
            }
        }
    }
}