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using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Cms
{
internal interface ISignerInfoGenerator
{
SignerInfo Generate(DerObjectIdentifier contentType, AlgorithmIdentifier digestAlgorithm,
byte[] calculatedDigest);
}
public class SignerInfoGenerator
{
internal X509Certificate certificate;
internal ISignatureFactory contentSigner;
internal SignerIdentifier sigId;
internal CmsAttributeTableGenerator signedGen;
internal CmsAttributeTableGenerator unsignedGen;
private bool isDirectSignature;
internal SignerInfoGenerator(SignerIdentifier sigId, ISignatureFactory signerFactory)
: this(sigId, signerFactory, false)
{
}
internal SignerInfoGenerator(SignerIdentifier sigId, ISignatureFactory signerFactory, bool isDirectSignature)
{
this.sigId = sigId;
this.contentSigner = signerFactory;
this.isDirectSignature = isDirectSignature;
if (this.isDirectSignature)
{
this.signedGen = null;
this.unsignedGen = null;
}
else
{
this.signedGen = new DefaultSignedAttributeTableGenerator();
this.unsignedGen = null;
}
}
internal SignerInfoGenerator(SignerIdentifier sigId, ISignatureFactory contentSigner,
CmsAttributeTableGenerator signedGen, CmsAttributeTableGenerator unsignedGen)
{
this.sigId = sigId;
this.contentSigner = contentSigner;
this.signedGen = signedGen;
this.unsignedGen = unsignedGen;
this.isDirectSignature = false;
}
internal void SetAssociatedCertificate(X509Certificate certificate)
{
this.certificate = certificate;
}
public SignerInfoGeneratorBuilder NewBuilder()
{
SignerInfoGeneratorBuilder builder = new SignerInfoGeneratorBuilder();
builder.WithSignedAttributeGenerator(signedGen);
builder.WithUnsignedAttributeGenerator(unsignedGen);
builder.SetDirectSignature(isDirectSignature);
return builder;
}
}
public class SignerInfoGeneratorBuilder
{
private bool directSignature;
private CmsAttributeTableGenerator signedGen;
private CmsAttributeTableGenerator unsignedGen;
public SignerInfoGeneratorBuilder()
{
}
/**
* If the passed in flag is true, the signer signature will be based on the data, not
* a collection of signed attributes, and no signed attributes will be included.
*
* @return the builder object
*/
public SignerInfoGeneratorBuilder SetDirectSignature(bool hasNoSignedAttributes)
{
this.directSignature = hasNoSignedAttributes;
return this;
}
/**
* Provide a custom signed attribute generator.
*
* @param signedGen a generator of signed attributes.
* @return the builder object
*/
public SignerInfoGeneratorBuilder WithSignedAttributeGenerator(CmsAttributeTableGenerator signedGen)
{
this.signedGen = signedGen;
return this;
}
/**
* Provide a generator of unsigned attributes.
*
* @param unsignedGen a generator for signed attributes.
* @return the builder object
*/
public SignerInfoGeneratorBuilder WithUnsignedAttributeGenerator(CmsAttributeTableGenerator unsignedGen)
{
this.unsignedGen = unsignedGen;
return this;
}
/**
* Build a generator with the passed in X.509 certificate issuer and serial number as the signerIdentifier.
*
* @param contentSigner operator for generating the final signature in the SignerInfo with.
* @param certificate X.509 certificate related to the contentSigner.
* @return a SignerInfoGenerator
* @throws OperatorCreationException if the generator cannot be built.
*/
public SignerInfoGenerator Build(ISignatureFactory contentSigner, X509Certificate certificate)
{
SignerIdentifier sigId = new SignerIdentifier(new IssuerAndSerialNumber(certificate.IssuerDN,
new DerInteger(certificate.SerialNumber)));
SignerInfoGenerator sigInfoGen = CreateGenerator(contentSigner, sigId);
sigInfoGen.SetAssociatedCertificate(certificate);
return sigInfoGen;
}
/**
* Build a generator with the passed in subjectKeyIdentifier as the signerIdentifier. If used you should
* try to follow the calculation described in RFC 5280 section 4.2.1.2.
*
* @param signerFactory operator factory for generating the final signature in the SignerInfo with.
* @param subjectKeyIdentifier key identifier to identify the public key for verifying the signature.
* @return a 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, true);
}
if (signedGen != null || unsignedGen != null)
{
if (signedGen == null)
{
signedGen = new DefaultSignedAttributeTableGenerator();
}
return new SignerInfoGenerator(sigId, contentSigner, signedGen, unsignedGen);
}
return new SignerInfoGenerator(sigId, contentSigner);
}
}
}
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