X509SignatureGenerator.cs

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namespace System.Security.Cryptography.X509Certificates;
 
public abstract class X509SignatureGenerator
{
    private PublicKey _publicKey;
 
    public PublicKey PublicKey
    {
        get
        {
            if (_publicKey == null)
            {
                _publicKey = BuildPublicKey();
            }
            return _publicKey;
        }
    }
 
    public abstract byte[] GetSignatureAlgorithmIdentifier(HashAlgorithmName hashAlgorithm);
 
    public abstract byte[] SignData(byte[] data, HashAlgorithmName hashAlgorithm);
 
    protected abstract PublicKey BuildPublicKey();
 
    public static X509SignatureGenerator CreateForECDsa(ECDsa key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        return new ECDsaX509SignatureGenerator(key);
    }
 
    public static X509SignatureGenerator CreateForRSA(RSA key, RSASignaturePadding signaturePadding)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        if (signaturePadding == null)
        {
            throw new ArgumentNullException("signaturePadding");
        }
        if (signaturePadding == RSASignaturePadding.Pkcs1)
        {
            return new RSAPkcs1X509SignatureGenerator(key);
        }
        if (signaturePadding.Mode == RSASignaturePaddingMode.Pss)
        {
            return new RSAPssX509SignatureGenerator(key, signaturePadding);
        }
        throw new ArgumentException(System.SR.Cryptography_InvalidPaddingMode);
    }
}