init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Cms/SignerInfoGeneratorBuilder.cs

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+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Cms;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.X509;
+
+namespace Org.BouncyCastle.Cms;
+
+public class SignerInfoGeneratorBuilder
+{
+	private bool directSignature;
+
+	private CmsAttributeTableGenerator signedGen;
+
+	private CmsAttributeTableGenerator unsignedGen;
+
+	public SignerInfoGeneratorBuilder SetDirectSignature(bool hasNoSignedAttributes)
+	{
+		directSignature = hasNoSignedAttributes;
+		return this;
+	}
+
+	public SignerInfoGeneratorBuilder WithSignedAttributeGenerator(CmsAttributeTableGenerator signedGen)
+	{
+		this.signedGen = signedGen;
+		return this;
+	}
+
+	public SignerInfoGeneratorBuilder WithUnsignedAttributeGenerator(CmsAttributeTableGenerator unsignedGen)
+	{
+		this.unsignedGen = unsignedGen;
+		return this;
+	}
+
+	public SignerInfoGenerator Build(ISignatureFactory contentSigner, X509Certificate certificate)
+	{
+		SignerIdentifier sigId = new SignerIdentifier(new IssuerAndSerialNumber(certificate.IssuerDN, new DerInteger(certificate.SerialNumber)));
+		SignerInfoGenerator signerInfoGenerator = CreateGenerator(contentSigner, sigId);
+		signerInfoGenerator.setAssociatedCertificate(certificate);
+		return signerInfoGenerator;
+	}
+
+	public SignerInfoGenerator Build(ISignatureFactory signerFactory, byte[] subjectKeyIdentifier)
+	{
+		SignerIdentifier sigId = new SignerIdentifier(new DerOctetString(subjectKeyIdentifier));
+		return CreateGenerator(signerFactory, sigId);
+	}
+
+	private SignerInfoGenerator CreateGenerator(ISignatureFactory contentSigner, SignerIdentifier sigId)
+	{
+		if (directSignature)
+		{
+			return new SignerInfoGenerator(sigId, contentSigner, isDirectSignature: true);
+		}
+		if (signedGen != null || unsignedGen != null)
+		{
+			if (signedGen == null)
+			{
+				signedGen = new DefaultSignedAttributeTableGenerator();
+			}
+			return new SignerInfoGenerator(sigId, contentSigner, signedGen, unsignedGen);
+		}
+		return new SignerInfoGenerator(sigId, contentSigner);
+	}
+}