RSAPKCS1SignatureDeformatter.cs

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using System.Runtime.Versioning;
using Internal.Cryptography;
 
namespace System.Security.Cryptography;
 
[UnsupportedOSPlatform("browser")]
public class RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter
{
    private RSA _rsaKey;
 
    private string _algName;
 
    public RSAPKCS1SignatureDeformatter()
    {
    }
 
    public RSAPKCS1SignatureDeformatter(AsymmetricAlgorithm key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        _rsaKey = (RSA)key;
    }
 
    public override void SetKey(AsymmetricAlgorithm key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        _rsaKey = (RSA)key;
    }
 
    public override void SetHashAlgorithm(string strName)
    {
        if (CryptoConfig.MapNameToOID(strName) != null)
        {
            _algName = HashAlgorithmNames.ToUpper(strName);
        }
        else
        {
            _algName = null;
        }
    }
 
    public override bool VerifySignature(byte[] rgbHash, byte[] rgbSignature)
    {
        if (rgbHash == null)
        {
            throw new ArgumentNullException("rgbHash");
        }
        if (rgbSignature == null)
        {
            throw new ArgumentNullException("rgbSignature");
        }
        if (_algName == null)
        {
            throw new CryptographicUnexpectedOperationException(System.SR.Cryptography_MissingOID);
        }
        if (_rsaKey == null)
        {
            throw new CryptographicUnexpectedOperationException(System.SR.Cryptography_MissingKey);
        }
        return _rsaKey.VerifyHash(rgbHash, rgbSignature, new HashAlgorithmName(_algName), RSASignaturePadding.Pkcs1);
    }
}