using GostCryptography.Asn1.Gost.Gost_R3410_2001;
using GostCryptography.Base;
using GostCryptography.Config;
using GostCryptography.Gost_R3411;
using GostCryptography.Native;
using GostCryptography.Properties;
using System.Security;
using System.Security.Cryptography;

namespace GostCryptography.Gost_R3410
{
    /// <summary>
    /// Реализация алгоритма ГОСТ Р 34.10-2001
    /// </summary>
    public sealed class Gost_R3410_2001_AsymmetricAlgorithm : Gost_R3410_AsymmetricAlgorithm<Gost_R3410_2001_KeyExchangeParams, Gost_R3410_2001_KeyExchangeAlgorithm>
    {
        /// <summary>
        /// Размер ключа ГОСТ Р 34.10-2001
        /// </summary>
        public const int DefaultKeySizeValue = 512;

        /// <summary>
        /// Наименование алгоритма цифровой подписи ГОСТ Р 34.10-2001
        /// </summary>
        public const string SignatureAlgorithmValue = "urn:ietf:params:xml:ns:cpxmlsec:algorithms:gostr34102001-gostr3411";

        /// <summary>
        /// Устаревшее наименование алгоритма цифровой подписи ГОСТ Р 34.10-2001
        /// </summary>
        public const string ObsoleteSignatureAlgorithmValue = "http://www.w3.org/2001/04/xmldsig-more#gostr34102001-gostr3411";

        /// <summary>
        /// Наименование алгоритма обмена ключами ГОСТ Р 34.10-2001
        /// </summary>
        public const string KeyExchangeAlgorithmValue = "urn:ietf:params:xml:ns:cpxmlsec:algorithms:transport-gost2001";

        /// <summary>
        /// Известные наименования алгоритма цифровой подписи ГОСТ Р 34.10-2001
        /// </summary>
        public static readonly string[] KnownSignatureAlgorithmNames = { SignatureAlgorithmValue, ObsoleteSignatureAlgorithmValue };

        /// <inheritdoc />
        [SecuritySafeCritical]
        public Gost_R3410_2001_AsymmetricAlgorithm() : this(GostCryptoConfig.ProviderType)
        {
        }

        /// <inheritdoc />
        [SecuritySafeCritical]
        public Gost_R3410_2001_AsymmetricAlgorithm(ProviderType providerType) : base(providerType, DefaultKeySizeValue)
        {
        }

        /// <inheritdoc />
        [SecuritySafeCritical]
        public Gost_R3410_2001_AsymmetricAlgorithm(CspParameters providerParameters) : base(providerParameters, DefaultKeySizeValue)
        {
        }

        /// <inheritdoc />
        public override string AlgorithmName => SignatureAlgorithmValue;

        /// <inheritdoc />
        public override string SignatureAlgorithm => SignatureAlgorithmValue;

        /// <inheritdoc />
        public override string KeyExchangeAlgorithm => KeyExchangeAlgorithmValue;

        /// <inheritdoc />
        protected override int ExchangeAlgId => Constants.CALG_DH_EL_SF;

        /// <inheritdoc />
        protected override int SignatureAlgId => Constants.CALG_GR3410EL;

        /// <inheritdoc />
        protected override Gost_R3410_2001_KeyExchangeParams CreateKeyExchangeParams()
        {
            return new Gost_R3410_2001_KeyExchangeParams();
        }

        /// <inheritdoc />
        [SecuritySafeCritical]
        protected override Gost_R3410_2001_KeyExchangeAlgorithm CreateKeyExchangeAlgorithm(ProviderType providerType, SafeProvHandleImpl provHandle, SafeKeyHandleImpl keyHandle, Gost_R3410_2001_KeyExchangeParams keyExchangeParameters)
        {
            return new Gost_R3410_2001_KeyExchangeAlgorithm(providerType, provHandle, keyHandle, keyExchangeParameters, KeySizeValue, SignatureAlgId);
        }

        /// <inheritdoc />
        [SecuritySafeCritical]
        public override GostHashAlgorithm CreateHashAlgorithm()
        {
            return new Gost_R3411_94_HashAlgorithm(ProviderType, this.GetSafeHandle<SafeProvHandleImpl>());
        }

        /// <inheritdoc />
        protected override void ValidateHashParameter(byte[] hash)
        {
            if (hash == null)
            {
                throw ExceptionUtility.ArgumentNull(nameof(hash));
            }

            if (hash.Length != Gost_R3411_94_HashAlgorithm.DefaultHashSizeValue / 8)
            {
                throw ExceptionUtility.ArgumentOutOfRange(nameof(hash), Resources.InvalidHashSize, Gost_R3411_94_HashAlgorithm.DefaultHashSizeValue / 8);
            }
        }

        /// <inheritdoc />
        public override GostKeyExchangeFormatter CreateKeyExchangeFormatter()
        {
            return new Gost_R3410_2001_KeyExchangeFormatter(this);
        }

        /// <inheritdoc />
        public override GostKeyExchangeDeformatter CreateKeyExchangeDeformatter()
        {
            return new Gost_R3410_2001_KeyExchangeDeformatter(this);
        }

        /// <inheritdoc />
        protected override Gost_R3410_KeyExchangeXmlSerializer<Gost_R3410_2001_KeyExchangeParams> CreateKeyExchangeXmlSerializer()
        {
            return new Gost_R3410_2001_KeyExchangeXmlSerializer();
        }
    }
}
