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Diffstat (limited to 'pkix/src/main/java/org/spongycastle/cms/CMSSignedDataGenerator.java')
| -rw-r--r-- | pkix/src/main/java/org/spongycastle/cms/CMSSignedDataGenerator.java | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/cms/CMSSignedDataGenerator.java b/pkix/src/main/java/org/spongycastle/cms/CMSSignedDataGenerator.java new file mode 100644 index 00000000..70dce12a --- /dev/null +++ b/pkix/src/main/java/org/spongycastle/cms/CMSSignedDataGenerator.java @@ -0,0 +1,232 @@ +package org.spongycastle.cms; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.OutputStream; +import java.util.ArrayList; +import java.util.Iterator; +import java.util.List; + +import org.spongycastle.asn1.ASN1EncodableVector; +import org.spongycastle.asn1.ASN1ObjectIdentifier; +import org.spongycastle.asn1.ASN1OctetString; +import org.spongycastle.asn1.ASN1Set; +import org.spongycastle.asn1.BEROctetString; +import org.spongycastle.asn1.DERSet; +import org.spongycastle.asn1.cms.CMSObjectIdentifiers; +import org.spongycastle.asn1.cms.ContentInfo; +import org.spongycastle.asn1.cms.SignedData; +import org.spongycastle.asn1.cms.SignerInfo; + +/** + * general class for generating a pkcs7-signature message. + * <p> + * A simple example of usage, generating a detached signature. + * + * <pre> + * List certList = new ArrayList(); + * CMSTypedData msg = new CMSProcessableByteArray("Hello world!".getBytes()); + * + * certList.add(signCert); + * + * Store certs = new JcaCertStore(certList); + * + * CMSSignedDataGenerator gen = new CMSSignedDataGenerator(); + * ContentSigner sha1Signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider("SC").build(signKP.getPrivate()); + * + * gen.addSignerInfoGenerator( + * new JcaSignerInfoGeneratorBuilder( + * new JcaDigestCalculatorProviderBuilder().setProvider("SC").build()) + * .build(sha1Signer, signCert)); + * + * gen.addCertificates(certs); + * + * CMSSignedData sigData = gen.generate(msg, false); + * </pre> + */ +public class CMSSignedDataGenerator + extends CMSSignedGenerator +{ + private List signerInfs = new ArrayList(); + + /** + * base constructor + */ + public CMSSignedDataGenerator() + { + } + + /** + * Generate a CMS Signed Data object carrying a detached CMS signature. + * + * @param content the content to be signed. + */ + public CMSSignedData generate( + CMSTypedData content) + throws CMSException + { + return generate(content, false); + } + + /** + * Generate a CMS Signed Data object which can be carrying a detached CMS signature, or have encapsulated data, depending on the value + * of the encapsulated parameter. + * + * @param content the content to be signed. + * @param encapsulate true if the content should be encapsulated in the signature, false otherwise. + */ + public CMSSignedData generate( + // FIXME Avoid accessing more than once to support CMSProcessableInputStream + CMSTypedData content, + boolean encapsulate) + throws CMSException + { + if (!signerInfs.isEmpty()) + { + throw new IllegalStateException("this method can only be used with SignerInfoGenerator"); + } + + // TODO +// if (signerInfs.isEmpty()) +// { +// /* RFC 3852 5.2 +// * "In the degenerate case where there are no signers, the +// * EncapsulatedContentInfo value being "signed" is irrelevant. In this +// * case, the content type within the EncapsulatedContentInfo value being +// * "signed" MUST be id-data (as defined in section 4), and the content +// * field of the EncapsulatedContentInfo value MUST be omitted." +// */ +// if (encapsulate) +// { +// throw new IllegalArgumentException("no signers, encapsulate must be false"); +// } +// if (!DATA.equals(eContentType)) +// { +// throw new IllegalArgumentException("no signers, eContentType must be id-data"); +// } +// } +// +// if (!DATA.equals(eContentType)) +// { +// /* RFC 3852 5.3 +// * [The 'signedAttrs']... +// * field is optional, but it MUST be present if the content type of +// * the EncapsulatedContentInfo value being signed is not id-data. +// */ +// // TODO signedAttrs must be present for all signers +// } + + ASN1EncodableVector digestAlgs = new ASN1EncodableVector(); + ASN1EncodableVector signerInfos = new ASN1EncodableVector(); + + digests.clear(); // clear the current preserved digest state + + // + // add the precalculated SignerInfo objects. + // + for (Iterator it = _signers.iterator(); it.hasNext();) + { + SignerInformation signer = (SignerInformation)it.next(); + digestAlgs.add(CMSSignedHelper.INSTANCE.fixAlgID(signer.getDigestAlgorithmID())); + + // TODO Verify the content type and calculated digest match the precalculated SignerInfo + signerInfos.add(signer.toASN1Structure()); + } + + // + // add the SignerInfo objects + // + ASN1ObjectIdentifier contentTypeOID = content.getContentType(); + + ASN1OctetString octs = null; + + if (content.getContent() != null) + { + ByteArrayOutputStream bOut = null; + + if (encapsulate) + { + bOut = new ByteArrayOutputStream(); + } + + OutputStream cOut = CMSUtils.attachSignersToOutputStream(signerGens, bOut); + + // Just in case it's unencapsulated and there are no signers! + cOut = CMSUtils.getSafeOutputStream(cOut); + + try + { + content.write(cOut); + + cOut.close(); + } + catch (IOException e) + { + throw new CMSException("data processing exception: " + e.getMessage(), e); + } + + if (encapsulate) + { + octs = new BEROctetString(bOut.toByteArray()); + } + } + + for (Iterator it = signerGens.iterator(); it.hasNext();) + { + SignerInfoGenerator sGen = (SignerInfoGenerator)it.next(); + SignerInfo inf = sGen.generate(contentTypeOID); + + digestAlgs.add(inf.getDigestAlgorithm()); + signerInfos.add(inf); + + byte[] calcDigest = sGen.getCalculatedDigest(); + + if (calcDigest != null) + { + digests.put(inf.getDigestAlgorithm().getAlgorithm().getId(), calcDigest); + } + } + + ASN1Set certificates = null; + + if (certs.size() != 0) + { + certificates = CMSUtils.createBerSetFromList(certs); + } + + ASN1Set certrevlist = null; + + if (crls.size() != 0) + { + certrevlist = CMSUtils.createBerSetFromList(crls); + } + + ContentInfo encInfo = new ContentInfo(contentTypeOID, octs); + + SignedData sd = new SignedData( + new DERSet(digestAlgs), + encInfo, + certificates, + certrevlist, + new DERSet(signerInfos)); + + ContentInfo contentInfo = new ContentInfo( + CMSObjectIdentifiers.signedData, sd); + + return new CMSSignedData(content, contentInfo); + } + + /** + * generate a set of one or more SignerInformation objects representing counter signatures on + * the passed in SignerInformation object. + * + * @param signer the signer to be countersigned + * @return a store containing the signers. + */ + public SignerInformationStore generateCounterSigners(SignerInformation signer) + throws CMSException + { + return this.generate(new CMSProcessableByteArray(null, signer.getSignature()), false).getSignerInfos(); + } +} + |