ComiServMirror/Entities/User.cs

using Microsoft.EntityFrameworkCore;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Security.Cryptography;

namespace ComiServ.Entities
{
    [PrimaryKey(nameof(Id))]
    [Index(nameof(Username), IsUnique = true)]
    public class User
    {
        public const int HashLengthBytes = 512 / 8;
        public const int SaltLengthBytes = HashLengthBytes;
        public int Id { get; set; }
        [MaxLength(20)]
        public string Username { get; set; }
        [MaxLength(SaltLengthBytes)]
        public byte[] Salt { get; set; }
        [MaxLength(HashLengthBytes)]
        public byte[] HashedPassword { get; set; }
        public UserType UserType { get; set; }
        public UserTypeEnum UserTypeId { get; set; }
        [InverseProperty("User")]
        public ICollection<ComicRead> ComicsRead { get; set; } = [];
        //cryptography should probably be in a different class
        public static byte[] MakeSalt()
        {
            byte[] arr = new byte[SaltLengthBytes];
            RandomNumberGenerator.Fill(new Span<byte>(arr));
            return arr;
        }
        public static byte[] Hash(byte[] password, byte[] salt)
        {
            var salted = salt.Append((byte)':').Concat(password).ToArray();
            return SHA512.HashData(salted);
        }
    }
}