Examples of org.bouncycastle.cms.CMSSignedDataParser

org.bouncycastle.cms.CMSSignedDataParser

Parsing class for an CMS Signed Data object from an input stream.

Note: that because we are in a streaming mode only one signer can be tried and it is important that the methods on the parser are called in the appropriate order.

A simple example of usage for an encapsulated signature.

Two notes: first, in the example below the validity of the certificate isn't verified, just the fact that one of the certs matches the given signer, and, second, because we are in a streaming mode the order of the operations is important.

 CMSSignedDataParser     sp = new CMSSignedDataParser(encapSigData); sp.getSignedContent().drain(); CertStore               certs = sp.getCertificatesAndCRLs("Collection", "BC"); SignerInformationStore  signers = sp.getSignerInfos(); Collection              c = signers.getSigners(); Iterator                it = c.iterator(); while (it.hasNext()) { SignerInformation   signer = (SignerInformation)it.next(); Collection          certCollection = certs.getCertificates(signer.getSID()); Iterator        certIt = certCollection.iterator(); X509Certificate cert = (X509Certificate)certIt.next(); System.out.println("verify returns: " + signer.verify(cert, "BC")); }

Note also: this class does not introduce buffering - if you are processing large files you should create the parser with:

 CMSSignedDataParser     ep = new CMSSignedDataParser(new BufferedInputStream(encapSigData, bufSize));

where bufSize is a suitably large buffer size.


        sigOut.write(TEST_MESSAGE.getBytes());


        sigOut.close();


        CMSSignedDataParser     sp = new CMSSignedDataParser(bOut.toByteArray());


        CMSTypedStream stream = sp.getSignedContent();


        assertEquals("1.2.3.4", stream.getContentType());


        stream.drain();

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        sigOut.write(TEST_MESSAGE.getBytes());
        
        sigOut.close();
        
        CMSSignedDataParser     sp = new CMSSignedDataParser(
                new CMSTypedStream(new ByteArrayInputStream(TEST_MESSAGE.getBytes())), bOut.toByteArray());
    
        sp.getSignedContent().drain();
        
        verifySignatures(sp);
    }

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            sigOut.write(i & 0xff);
        }
        
        sigOut.close();
        
        CMSSignedDataParser     sp = new CMSSignedDataParser(bOut.toByteArray());


        sp.getSignedContent().drain();
        
        verifySignatures(sp);
        
        int unbufferedLength = bOut.toByteArray().length;

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            sigOut.write(i & 0xff);
        }
        
        sigOut.close();
        
        CMSSignedDataParser     sp = new CMSSignedDataParser(bOut.toByteArray());
    
        sp.getSignedContent().drain();
        
        verifySignatures(sp);
        
        int unbufferedLength = bOut.toByteArray().length;

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        sigOut.write(TEST_MESSAGE.getBytes());
        
        sigOut.close();
        
        CMSSignedDataParser     sp = new CMSSignedDataParser(bOut.toByteArray());


        sp.getSignedContent().drain();
        
        verifySignatures(sp);
        
        byte[] contentDigest = (byte[])gen.getGeneratedDigests().get(CMSSignedGenerator.DIGEST_SHA1);


        AttributeTable table = ((SignerInformation)sp.getSignerInfos().getSigners().iterator().next()).getSignedAttributes();
        Attribute hash = table.get(CMSAttributes.messageDigest);


        assertTrue(MessageDigest.isEqual(contentDigest, ((ASN1OctetString)hash.getAttrValues().getObjectAt(0)).getOctets()));


        //
        // try using existing signer
        //
        gen = new CMSSignedDataStreamGenerator();


        gen.addSigners(sp.getSignerInfos());
        
        gen.addCertificatesAndCRLs(sp.getCertificatesAndCRLs("Collection", "BC"));
        
        bOut.reset();
        
        sigOut = gen.open(bOut, true);

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        sigOut.write(TEST_MESSAGE.getBytes());


        sigOut.close();


        CMSSignedDataParser     sp = new CMSSignedDataParser(bOut.toByteArray());


        sp.getSignedContent().drain();


        verifySignatures(sp);


        //
        // check attributes
        //
        SignerInformationStore  signers = sp.getSignerInfos();


        Collection              c = signers.getSigners();
        Iterator                it = c.iterator();


        while (it.hasNext())

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        sigOut.write(TEST_MESSAGE.getBytes());


        sigOut.close();


        CMSSignedDataParser     sp = new CMSSignedDataParser(bOut.toByteArray());


        sp.getSignedContent().drain();


        assertEquals(4, sp.getVersion());


        store = sp.getAttributeCertificates("Collection", "BC");


        Collection coll = store.getMatches(null);


        assertEquals(1, coll.size());

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        sd = new CMSSignedData(new CMSProcessableByteArray(data), newOut.toByteArray());
        SignerInformation signer = (SignerInformation)sd.getSignerInfos().getSigners().iterator().next();


        assertEquals(signer.getDigestAlgOID(), CMSSignedDataStreamGenerator.DIGEST_SHA224);


        CMSSignedDataParser sp = new CMSSignedDataParser(new CMSTypedStream(new ByteArrayInputStream(data)), newOut.toByteArray());


        sp.getSignedContent().drain();


        verifySignatures(sp);
    }

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        sd = new CMSSignedData(newOut.toByteArray());
        SignerInformation signer = (SignerInformation)sd.getSignerInfos().getSigners().iterator().next();


        assertEquals(signer.getDigestAlgOID(), CMSSignedDataStreamGenerator.DIGEST_SHA224);


        CMSSignedDataParser sp = new CMSSignedDataParser(newOut.toByteArray());


        sp.getSignedContent().drain();


        verifySignatures(sp);
    }

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        ByteArrayInputStream original = new ByteArrayInputStream(bOut.toByteArray());
        ByteArrayOutputStream newOut = new ByteArrayOutputStream();


        CMSSignedDataParser.replaceCertificatesAndCRLs(original, certs, newOut);


        CMSSignedDataParser sp = new CMSSignedDataParser(new CMSTypedStream(new ByteArrayInputStream(data)), newOut.toByteArray());


        sp.getSignedContent().drain();


        verifySignatures(sp);
    }

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