Example usage for org.bouncycastle.cms SignerId equals

Introduction

In this page you can find the example usage for org.bouncycastle.cms SignerId equals.

Prototype

public boolean equals(Object o) 

Source Link

Usage

From source file:org.cryptoworkshop.ximix.client.verify.LinkIndexVerifier.java

License:Apache License

public void verify(int stepNo, boolean isWithPairing, InputStream transcript)
        throws TranscriptVerificationException {
    CMSSignedDataParser cmsParser;/*from w  w  w  .j a  v a 2s . c  om*/
    SignerId currentSID;
    Set<Integer> pmIndexes = new HashSet<>();
    Set<Integer> cmIndexes = new HashSet<>();

    try {
        cmsParser = new CMSSignedDataParser(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build(),
                transcript);

        ASN1InputStream aIn = new ASN1InputStream(cmsParser.getSignedContent().getContentStream());
        Object obj;
        while ((obj = aIn.readObject()) != null) {
            PostedData pM = PostedData.getInstance(obj);
            MessageCommitment cm = MessageCommitment.getInstance(pM.getData());

            pmIndexes.add(pM.getIndex());
            cmIndexes.add(cm.getNewIndex());
        }

        currentSID = ((SignerInformation) cmsParser.getSignerInfos().getSigners().iterator().next()).getSID();
    } catch (Exception e) {
        throw new TranscriptVerificationException("Cannot parse CMS wrapper on transcript: " + e.getMessage(),
                e);
    }

    SHA512Digest seedDigest = new SHA512Digest();
    byte[] stepSeed = new byte[seedDigest.getDigestSize()];

    // we follow the formulation in "Randomized Partial Checking Revisited" where the seed is
    // modified by the step number, the one difference being that in our case this will only take
    // place at the start of a pairing, or on an individual step.
    seedDigest.update(this.challengeSeed, 0, this.challengeSeed.length);

    seedDigest.update((byte) (stepNo >>> 24));
    seedDigest.update((byte) (stepNo >>> 16));
    seedDigest.update((byte) (stepNo >>> 8));
    seedDigest.update((byte) stepNo);

    seedDigest.doFinal(stepSeed, 0);

    IndexNumberGenerator challenger;

    if (boardSize != 1) {
        challenger = new SeededChallenger(boardSize, stepNo, stepSeed);
    } else {
        challenger = new SerialChallenger(boardSize, stepNo, stepSeed);
    }

    Set<Integer> indexes = new HashSet<>();

    while (challenger.hasNext()) {
        indexes.add(challenger.nextIndex());
    }

    if (boardSize != 1 && isWithPairing) {
        if (!currentSID.equals(lastSID)) {
            for (int i = 0; i != boardSize; i++) {
                nextIndexes.add(i);
            }
        } else {
            indexes = new HashSet<>(nextIndexes);
        }
    }

    lastSID = currentSID;

    if (indexes.size() != pmIndexes.size()) {
        throw new TranscriptVerificationException(
                "Entries in witness table do not correspond to seeding - step " + stepNo + " size( "
                        + indexes.size() + ", " + pmIndexes.size() + ")");
    }

    indexes.removeAll(pmIndexes);
    nextIndexes.removeAll(cmIndexes);

    if (!indexes.isEmpty()) {
        throw new TranscriptVerificationException(
                "Entries in witness table do not correspond to seeding - step " + stepNo + " unaccounted "
                        + indexes.size());
    }
}

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