import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
/**
 * Usage flags as Bouncy castle {@link PGPKeyFlags} bits.
 */
public int getUsageFlags() throws PGPException {
    if (publicKey == null) return 0;

    int flags = 0;
    // actually only need POSITIVE_CERTIFICATION (for master key)
    // and SUBKEY_BINDING (for subkeys)
    Iterator<PGPSignature> signatures = publicKey.getSignatures();
    while (signatures.hasNext()) {
        PGPSignature signature = signatures.next();
        PGPSignatureSubpacketVector hashedSubPackets =
            signature.getHashedSubPackets();

        if (hashedSubPackets != null)
            flags |= hashedSubPackets.getKeyFlags();
    }
    return flags;
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
/**
 * Checks whether one of the signatures of the key has one of the expected
 * key flags
 * 
 * @param key
 * @return {@link Boolean#TRUE} if key has one of the expected flag,
 *         <code>null</code> if the key does not have any key flags,
 *         {@link Boolean#FALSE} if the key has none of the expected flags
 */
private static Boolean hasOneOfExpectedKeyFlags(PGPPublicKey key, int[] expectedKeyFlags) {
    boolean containsKeyFlags = false;
    for (@SuppressWarnings("unchecked")
    Iterator<PGPSignature> itsig = key.getSignatures(); itsig.hasNext();) {
        PGPSignature sig = itsig.next();
        PGPSignatureSubpacketVector subPacks = sig.getHashedSubPackets();
        if (subPacks != null) {
            int keyFlag = subPacks.getKeyFlags();
            if (keyFlag > 0 && !containsKeyFlags) {
                containsKeyFlags = true;
            }
            for (int expectdKeyFlag : expectedKeyFlags) {
                int result = keyFlag & expectdKeyFlag;
                if (result == expectdKeyFlag) {
                    return Boolean.TRUE;
                }
            }
        }
    }
    if (containsKeyFlags) {
        return Boolean.FALSE;
    }
    return null; // no key flag
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private Set<PgpKeyFlag> getPgpKeyFlags() {
	final EnumSet<PgpKeyFlag> result = EnumSet.noneOf(PgpKeyFlag.class);

	final PgpKeyId masterKeyId = masterKey == null ? getPgpKeyId() : masterKey.getPgpKeyId();

	final Iterator<?> sigIt = publicKey.getSignatures();
	while (sigIt.hasNext()) {
		final PGPSignature signature = (PGPSignature) sigIt.next();
		if (signature.getKeyID() != masterKeyId.longValue())
			continue;

		// It seems, the signature type is not always the way it should be (to my understanding).
		// To look for PGPSignature.SUBKEY_BINDING works fine, but PGPSignature.PRIMARYKEY_BINDING seems to
		// never be used. I thus do not filter by signature-type at all, anymore, but collect all keyFlags
		// from all signatures made by the master-key.

		final PGPSignatureSubpacketVector hashedSubPackets = signature.getHashedSubPackets();
		if (hashedSubPackets != null) {
			final int keyFlags = hashedSubPackets.getKeyFlags();
			result.addAll(getPgpKeyFlags(keyFlags));
		}
	}
	return result;
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
/**
 * Check if the PGPSignature contains sub keys that suit our usage. We need 
 * sub keys that are suitable for encrypting storage. 
 * @param sig - PGPSignature
 * @param keyUsage - Usage type - Encrypt storage or communication
 * @return true if a sub key for encrypting storage is found else false 
 */
private boolean isMatchingUsage(PGPSignature sig, int keyUsage) {
    if (sig.hasSubpackets()) {
        PGPSignatureSubpacketVector sv = sig.getHashedSubPackets();
        if (sv.hasSubpacket(CryptDecryptUtil.KEY_FLAGS)) {
        	if ((sv.getKeyFlags() == 0 && keyUsage == 0)) {
        		return false;
        	}
        }
    }
    return true;
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private static PGPPublicKeyRing addUserId(
		final PGPPublicKeyRing publicKeyRing, final String userId,
		final PGPSecretKeyRing secretKeyRing,
		final char[] passphrase,
		PGPContentSignerBuilder signerBuilder,
		final PGPSignatureSubpacketVector hashedSubpackets,
		final PGPSignatureSubpacketVector unhashedSubpackets) throws PGPException {
	assertNotNull(publicKeyRing, "publicKeyRing");
	assertNotNull(userId, "userId");

	final PGPPublicKey masterPublicKey = getMasterKeyOrFail(publicKeyRing);
	final PGPSecretKey masterSecretKey = secretKeyRing.getSecretKey(masterPublicKey.getKeyID());
	assertNotNull(masterSecretKey, "masterSecretKey");
	final PGPPrivateKey privateKey = extractPrivateKey(masterSecretKey, passphrase);

	final PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);

	sGen.init(PGPSignature.POSITIVE_CERTIFICATION, privateKey);

	sGen.setHashedSubpackets(hashedSubpackets);
	sGen.setUnhashedSubpackets(unhashedSubpackets);

	final PGPSignature certification = sGen.generateCertification(userId, masterPublicKey);
	final PGPPublicKey newMasterPublicKey = PGPPublicKey.addCertification(masterPublicKey, userId, certification);

	PGPPublicKeyRing result = PGPPublicKeyRing.removePublicKey(publicKeyRing, masterPublicKey);
	result = PGPPublicKeyRing.insertPublicKey(result, newMasterPublicKey);
	return result;
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private static int getKeyFlags(PGPPublicKey key) {
    @SuppressWarnings("unchecked")
    Iterator<PGPSignature> sigs = key.getSignatures();
    while (sigs.hasNext()) {
        PGPSignature sig = sigs.next();
        PGPSignatureSubpacketVector subpackets = sig.getHashedSubPackets();
        if (subpackets != null)
            return subpackets.getKeyFlags();
    }
    return 0;
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private final static void maybeAddDesignated
    (List<byte[]> fps, PGPSignature sig, PGPPublicKey masterpk,
     StringBuilder errors)
    throws PGPException,SignatureException, IOException
{
    if (!isGoodDirectSignature(sig, masterpk, masterpk, errors)) { return; }
    PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
    if (hashed == null) {
        errors.append
            ("Designated revoking "+niceSig(sig)+
             " is missing revocation key.\n");
        return;
    }
    SignatureSubpacket spack =
        hashed.getSubpacket(SignatureSubpacketTags.REVOCATION_KEY);
    if (spack == null) { return; }
    // You might think that the parser actually creates a RevocationKey
    // type, but no - you have to do that yourself.
    RevocationKey designated_revoker =
        new RevocationKey(spack.isCritical(), spack.getData());

    // 0x80 bit must be set
    if ((designated_revoker.getSignatureClass() & 0x80) == 0) { return; }
    // algorithm id must match
    if (designated_revoker.getAlgorithm() != masterpk.getAlgorithm()) {
        return;
    }
    fps.add(designated_revoker.getFingerprint());
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private final static boolean hasKeyFlag(PGPSignature sig, int flag)
{
    PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
    if (hashed == null) { return false; }

    KeyFlags flags = (KeyFlags)
        hashed.getSubpacket(SignatureSubpacketTags.KEY_FLAGS);
    if (flags == null) { return false; }
    return ((flags.getFlags() & flag) != 0);
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private PGPSignatureSubpacketVector generateMasterKeySettings() {
    final PGPSignatureSubpacketGenerator settings = new PGPSignatureSubpacketGenerator();
    settings.setKeyFlags(false, Flags.toBitmask(KeyFlag.MASTER_KEY_DEFAULTS));
    settings.setPreferredSymmetricAlgorithms(false, Flags.toIntArray(SymmetricAlgorithm.ACCEPTABLE_ALGORITHMS));
    settings.setPreferredHashAlgorithms(false, Flags.toIntArray(HashAlgorithm.ACCEPTABLE_ALGORITHMS));
    settings.setPreferredCompressionAlgorithms(false, Flags.toIntArray(CompressionAlgorithm.ACCEPTABLE_ALGORITHMS));
    return settings.generate();
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
static boolean hasFlag(final PGPSignature signature, final int flag) {
    if (signature.hasSubpackets()) {
        PGPSignatureSubpacketVector subpacketVector = signature.getHashedSubPackets();
        if (subpacketVector.hasSubpacket(SignatureSubpacketTags.KEY_FLAGS)) {
            if ((subpacketVector.getKeyFlags() & flag) > 0) {
                return true;
            }
        }
    }
    return false;
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private void testMissingSubpackets(byte[] signature) 
    throws IOException
{
    PGPObjectFactory f = new PGPObjectFactory(signature);
    Object           obj = f.nextObject();
    
    while (!(obj instanceof PGPSignatureList))
    {
        obj = f.nextObject();
        if (obj instanceof PGPLiteralData)
        {
            InputStream in = ((PGPLiteralData)obj).getDataStream();
            Streams.drain(in);
        }
    }
    
    PGPSignature     sig = ((PGPSignatureList)obj).get(0);
    
    if (sig.getVersion() > 3)
    {
        PGPSignatureSubpacketVector v = sig.getHashedSubPackets();
        
        if (v.getKeyExpirationTime() != 0)
        {
            fail("key expiration time not zero for missing subpackets");
        }

        if (!sig.hasSubpackets())
        {
            fail("hasSubpackets() returns false with packets");
        }
    }
    else
    {
        if (sig.getHashedSubPackets() != null)
        {
            fail("hashed sub packets found when none expected");
        }
        if (sig.getUnhashedSubPackets() != null)
        {
            fail("unhashed sub packets found when none expected");
        }

        if (sig.hasSubpackets())
        {
            fail("hasSubpackets() returns true with no packets");
        }
    }
}
 

import org.bouncycastle.openpgp.PGPSignatureSubpacketVector; //导入依赖的package包/类
private PGPSignatureSubpacketVector generateSubKeySettings() {
    final PGPSignatureSubpacketGenerator settings = new PGPSignatureSubpacketGenerator();
    settings.setKeyFlags(false, Flags.toBitmask(KeyFlag.SUB_KEY_DEFAULTS));
    return settings.generate();
}