Blake3HashAlgorithm.cs

// Copyright (c) Alexandre Mutel. All rights reserved.
// Licensed under the BSD-Clause 2 license.
// See license.txt file in the project root for full license information.

using System;
using System.Security.Cryptography;

namespace Cryptography.Blake3
{
    /// <summary>
    /// Implementation of <see cref="HashAlgorithm"/> for BLAKE3.
    /// </summary>
    public class Blake3HashAlgorithm : HashAlgorithm
    {
        private Hasher _hasher;

        public Blake3HashAlgorithm()
        {
            _hasher = Hasher.New();
        }
        
        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            _hasher.Dispose();
        }
        
        protected override void HashCore(byte[] array, int ibStart, int cbSize)
        {
            var span = new byte[cbSize];
            Array.Copy(array, ibStart, span, 0, cbSize);
            _hasher.Update(span);
        }

        protected override byte[] HashFinal()
        {
            var hash = new byte[Blake3.Hash.Size];
            _hasher.Finalize(hash);
            return hash;
        }

        public override void Initialize()
        {
            _hasher.Reset();
        }
    }
}