Examples of org.bouncycastle.pqc.crypto.gmss.util.WinternitzOTSVerify.Verify()

Package org.bouncycastle.pqc.crypto.gmss.util

Class org.bouncycastle.pqc.crypto.gmss.util.WinternitzOTSVerify

Examples of org.bouncycastle.pqc.crypto.gmss.util.WinternitzOTSVerify.Verify()

org.bouncycastle.pqc.crypto.gmss.util.WinternitzOTSVerify.Verify()
This method computes the public OTS key from the one-time signature of a message. This is *NOT* a complete OTS signature verification, but it suffices for usage with CMSS. @param message the message @param signature the one-time signature @return The public OTS key

            // and reuse this signature to compute the first leaf of acual layer
            // more efficiently (by verifiing the signature)
            ots = new WinternitzOTSignature(OTSseed, digestProvider.get(), otsIndex[h]);
            currentRootSigs[h] = ots.getSignature(lowerRoot);
            WinternitzOTSVerify otsver = new WinternitzOTSVerify(digestProvider.get(), otsIndex[h]);
            help = otsver.Verify(lowerRoot, currentRootSigs[h]);
        }
        // update the tree with the first leaf
        treeToConstruct.update(help);


        int seedForTreehashIndex = 3;

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            otsSig = new byte[otsSigLength];
            System.arraycopy(signature, nextEntry, otsSig, 0, otsSigLength);
            nextEntry += otsSigLength;


            // compute public OTS key from the one-time signature
            otsPublicKey = otsVerify.Verify(message, otsSig);


            // test if OTSsignature is correct
            if (otsPublicKey == null)
            {
                System.err.println("OTS Public Key is null in GMSSSignature.verify");

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