78 lines
2.4 KiB
C#
78 lines
2.4 KiB
C#
using GostCryptography.Properties;
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using System;
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using System.Security.Cryptography;
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namespace GostCryptography.Base
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{
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/// <summary>
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/// Класс проверки цифровой подписи ГОСТ
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/// </summary>
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public class GostSignatureDeformatter : AsymmetricSignatureDeformatter
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{
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/// <summary>
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/// Конструктор
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/// </summary>
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public GostSignatureDeformatter()
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{
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}
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/// <summary>
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/// Конструктор
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/// </summary>
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/// <param name="publicKey">Открытый ключ для проверки цифровой подписи</param>
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/// <exception cref="ArgumentOutOfRangeException"></exception>
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/// <exception cref="ArgumentNullException"></exception>
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public GostSignatureDeformatter(AsymmetricAlgorithm publicKey) : this()
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{
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SetKey(publicKey);
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}
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private GostAsymmetricAlgorithm _publicKey;
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/// <inheritdoc />
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public override void SetKey(AsymmetricAlgorithm publicKey)
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{
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if (publicKey == null)
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{
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throw ExceptionUtility.ArgumentNull(nameof(publicKey));
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}
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if (!(publicKey is GostAsymmetricAlgorithm gostPublicKey))
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{
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if (publicKey.SignatureAlgorithm.IndexOf("gost", StringComparison.OrdinalIgnoreCase) < 0)
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{
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throw ExceptionUtility.ArgumentOutOfRange(nameof(publicKey), Resources.ShouldSupportGost3410);
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}
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gostPublicKey = new GostExternalAsymmetricAlgorithm(publicKey);
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}
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_publicKey = gostPublicKey;
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}
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/// <inheritdoc />
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public override void SetHashAlgorithm(string hashAlgorithmName)
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{
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}
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/// <inheritdoc />
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public override bool VerifySignature(byte[] hash, byte[] signature)
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{
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if (hash == null)
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{
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throw ExceptionUtility.ArgumentNull(nameof(hash));
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}
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if (signature == null)
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{
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throw ExceptionUtility.ArgumentNull(nameof(signature));
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}
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var reverseSignature = (byte[])signature.Clone();
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Array.Reverse(reverseSignature);
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return _publicKey.VerifySignature(hash, reverseSignature);
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}
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}
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}
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