1package org.bouncycastle.cms;
2
3import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
4import org.bouncycastle.cert.X509CertificateHolder;
5import org.bouncycastle.operator.ContentVerifier;
6import org.bouncycastle.operator.ContentVerifierProvider;
7import org.bouncycastle.operator.DigestCalculator;
8import org.bouncycastle.operator.DigestCalculatorProvider;
9import org.bouncycastle.operator.OperatorCreationException;
10import org.bouncycastle.operator.SignatureAlgorithmIdentifierFinder;
11
12public class SignerInformationVerifier
13{
14    private ContentVerifierProvider verifierProvider;
15    private DigestCalculatorProvider digestProvider;
16    private SignatureAlgorithmIdentifierFinder sigAlgorithmFinder;
17    private CMSSignatureAlgorithmNameGenerator sigNameGenerator;
18
19    public SignerInformationVerifier(CMSSignatureAlgorithmNameGenerator sigNameGenerator, SignatureAlgorithmIdentifierFinder sigAlgorithmFinder, ContentVerifierProvider verifierProvider, DigestCalculatorProvider digestProvider)
20    {
21        this.sigNameGenerator = sigNameGenerator;
22        this.sigAlgorithmFinder = sigAlgorithmFinder;
23        this.verifierProvider = verifierProvider;
24        this.digestProvider = digestProvider;
25    }
26
27    public boolean hasAssociatedCertificate()
28    {
29        return verifierProvider.hasAssociatedCertificate();
30    }
31
32    public X509CertificateHolder getAssociatedCertificate()
33    {
34        return verifierProvider.getAssociatedCertificate();
35    }
36
37    public ContentVerifier getContentVerifier(AlgorithmIdentifier signingAlgorithm, AlgorithmIdentifier digestAlgorithm)
38        throws OperatorCreationException
39    {
40        String          signatureName = sigNameGenerator.getSignatureName(digestAlgorithm, signingAlgorithm);
41
42        return verifierProvider.get(sigAlgorithmFinder.find(signatureName));
43    }
44
45    public DigestCalculator getDigestCalculator(AlgorithmIdentifier algorithmIdentifier)
46        throws OperatorCreationException
47    {
48        return digestProvider.get(algorithmIdentifier);
49    }
50}
51