Class CMSSignedDataParser

java.lang.Object
org.bouncycastle.cms.CMSContentInfoParser
org.bouncycastle.cms.CMSSignedDataParser
public class CMSSignedDataParser extends CMSContentInfoParser
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(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build(), encapSigData);

     sp.getSignedContent().drain();

     Store                   certStore = sp.getCertificates();
     SignerInformationStore  signers = sp.getSignerInfos();
     
     Collection              c = signers.getSigners();
     Iterator                it = c.iterator();

     while (it.hasNext())
     {
         SignerInformation   signer = (SignerInformation)it.next();
         Collection          certCollection = certStore.getMatches(signer.getSID());

         Iterator        certIt = certCollection.iterator();
         X509CertificateHolder cert = (X509CertificateHolder)certIt.next();

         System.out.println("verify returns: " + signer.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider("BC").build(cert)));
     }
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.

Stream handling note:

  • The constructor reads only enough of the supplied InputStream to expose the digest algorithms and signed-content metadata. The encapsulated content must be drained by the caller (e.g. getSignedContent().drain()) before calling getSignerInfos() so the running digests can be finalized.
  • The supplied InputStream is not closed automatically. Call CMSContentInfoParser.close() on this parser (inherited from CMSContentInfoParser) to close the underlying InputStream, or close it yourself.

  • Constructor Details

  • Method Details

    • getVersion

      public int getVersion()
      Return the version number for the SignedData object
      Returns:
      the version number

    • getDigestAlgorithmIDs

      public Set<org.bouncycastle.asn1.x509.AlgorithmIdentifier> getDigestAlgorithmIDs()
      Return the digest algorithm identifiers for the SignedData object
      Returns:
      the set of digest algorithm identifiers

    • getDigestAlgorithmsSet

      public org.bouncycastle.asn1.ASN1Set getDigestAlgorithmsSet()
      Return the digestAlgorithms field as parsed from the wire: a BERSet if the field used the indefinite-length (BER) method, a DLSet otherwise, with the algorithm identifiers in their original wire order. Use this when the original coding needs to be reproduced (e.g. re-emitting a SignedData covered by an ETSI archive-time-stamp); otherwise prefer getDigestAlgorithmIDs() (which de-duplicates and does not preserve order).
      Returns:
      the digestAlgorithms set, preserving wire form and order.

    • isContentBEREncoded

      public boolean isContentBEREncoded()
      Return true if the eContent OCTET STRING of the encapsulated content used a constructed/indefinite-length (BER) encoding, false if it was a primitive definite-length OCTET STRING (DL/DER), or if the signed data was detached (no eContent present). Together with CMSContentInfoParser.isBEREncoded() this exposes the original coding of the signed content without a second pass over the stream (see github #1983).
      Returns:
      true for BER (constructed) eContent, false otherwise.

    • getSignerInfos

      public SignerInformationStore getSignerInfos() throws CMSException
      return the collection of signers that are associated with the signatures for the message.
      Throws:
      CMSException

    • getCertificates

      public org.bouncycastle.util.Store getCertificates() throws CMSException
      Return any X.509 certificate objects in this SignedData structure as a Store of X509CertificateHolder objects.
      Returns:
      a Store of X509CertificateHolder objects.
      Throws:
      CMSException

    • getCRLs

      public org.bouncycastle.util.Store getCRLs() throws CMSException
      Return any X.509 CRL objects in this SignedData structure as a Store of X509CRLHolder objects.
      Returns:
      a Store of X509CRLHolder objects.
      Throws:
      CMSException

    • getAttributeCertificates

      public org.bouncycastle.util.Store getAttributeCertificates() throws CMSException
      Return any X.509 attribute certificate objects in this SignedData structure as a Store of X509AttributeCertificateHolder objects.
      Returns:
      a Store of X509AttributeCertificateHolder objects.
      Throws:
      CMSException

    • getOtherRevocationInfo

      public org.bouncycastle.util.Store getOtherRevocationInfo(org.bouncycastle.asn1.ASN1ObjectIdentifier otherRevocationInfoFormat) throws CMSException
      Return any OtherRevocationInfo OtherRevInfo objects of the type indicated by otherRevocationInfoFormat in this SignedData structure.
      Parameters:
      otherRevocationInfoFormat - OID of the format type been looked for.
      Returns:
      a Store of ASN1Encodable objects representing any objects of otherRevocationInfoFormat found.
      Throws:
      CMSException

    • getCertificateSet

      public org.bouncycastle.asn1.ASN1Set getCertificateSet() throws CMSException
      Return the raw certificates field as parsed from the wire, preserving every choice (X.509 SEQUENCE, attribute certificate [1], other [2]) in original encoding order. Null if the field was absent. Forces a populate of the cert/CRL sets (which is harmless to call multiple times). Use this when the wire order or non-X.509 choices matter; otherwise prefer getCertificates().
      Throws:
      CMSException

    • getCRLSet

      public org.bouncycastle.asn1.ASN1Set getCRLSet() throws CMSException
      Return the raw crls field as parsed from the wire, preserving every choice (CertificateList, other revocation info [1]) in original encoding order. Null if the field was absent. Forces a populate of the cert/CRL sets. Use this when the wire order or non-CertificateList choices matter; otherwise prefer getCRLs() or getOtherRevocationInfo(ASN1ObjectIdentifier).
      Throws:
      CMSException

    • getSignedContentTypeOID

      public String getSignedContentTypeOID()
      Return the a string representation of the OID associated with the encapsulated content info structure carried in the signed data.
      Returns:
      the OID for the content type.

    • getSignedContent

      public CMSTypedStream getSignedContent()

    • replaceSigners

      public static OutputStream replaceSigners(InputStream original, SignerInformationStore signerInformationStore, OutputStream out) throws CMSException, IOException
      Replace the signerinformation store associated with the passed in message contained in the stream original with the new one passed in. You would probably only want to do this if you wanted to change the unsigned attributes associated with a signer, or perhaps delete one.

      The output stream is returned unclosed.

      Parameters:
      original - the signed data stream to be used as a base.
      signerInformationStore - the new signer information store to use.
      out - the stream to write the new signed data object to.
      Returns:
      out.
      Throws:
      CMSException
      IOException

    • replaceSignersPreservingEncoding

      public static OutputStream replaceSignersPreservingEncoding(InputStream original, SignerInformationStore signerInformationStore, OutputStream out) throws CMSException, IOException
      Replace the signers of the message contained in the stream original with the store passed in, preserving the original wire encoding of everything an ETSI archive-time-stamp imprint covers (ETSI TS 101 733 Annex A, id-aa-ets-archiveTimestampV2).

      Unlike replaceSigners(InputStream, SignerInformationStore, OutputStream), which re-encodes as it goes (recomputed digestAlgorithms, re-chunked BER content, DER-sorted signerInfos), this method copies the version, digestAlgorithms, encapContentInfo, certificates and crls elements verbatim, byte for byte, from the original stream — the encapsulated content is piped, not buffered, so the method is suitable for content larger than a byte array. Only the signerInfos field is rebuilt: it is written as a definite-length SET containing the signers in store order, unsorted (a DER SET would sort, changing the wire order the imprint depends on). The outer ContentInfo / SignedData framing is re-emitted using the indefinite-length (BER) method, as with the other streaming generators; the framing is outside the archive-time-stamp imprint.

      The intended use is unsigned-attribute augmentation (e.g. attaching an archive-time-stamp): because digestAlgorithms is copied as-is, the replacement signers must not require digest algorithms beyond those already present in the original message.

      The output stream is returned unclosed.

      Parameters:
      original - the signed data stream to be used as a base.
      signerInformationStore - the new signer information store to use.
      out - the stream to write the new signed data object to.
      Returns:
      out.
      Throws:
      CMSException
      IOException

    • replaceCertificatesAndCRLs

      public static OutputStream replaceCertificatesAndCRLs(InputStream original, org.bouncycastle.util.Store certs, org.bouncycastle.util.Store crls, org.bouncycastle.util.Store attrCerts, OutputStream out) throws CMSException, IOException
      Replace the certificate and CRL information associated with this CMSSignedData object with the new one passed in.

      The output stream is returned unclosed.

      Parameters:
      original - the signed data stream to be used as a base.
      certs - new certificates to be used, if any.
      crls - new CRLs to be used, if any.
      attrCerts - new attribute certificates to be used, if any.
      out - the stream to write the new signed data object to.
      Returns:
      out.
      Throws:
      CMSException - if there is an error processing the CertStore
      IOException