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package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.sig.KeyFlags;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPOnePassSignature;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.PGPSignature;
import org.spongycastle.openpgp.PGPSignatureSubpacketVector;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider;
import org.spongycastle.openpgp.operator.jcajce.JcePublicKeyKeyEncryptionMethodGenerator;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.IterableIterator;
import java.security.SignatureException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class CachedPublicKey {
// this is the parent key ring
final CachedKeyRing mRing;
private final PGPPublicKey mKey;
CachedPublicKey(CachedKeyRing ring, PGPPublicKey key) {
mRing = ring;
mKey = key;
}
public long getKeyId() {
return mKey.getKeyID();
}
public boolean isRevoked() {
return mKey.isRevoked();
}
public Date getCreationTime() {
return mKey.getCreationTime();
}
public Date getExpiryTime() {
Date creationDate = getCreationTime();
if (mKey.getValidDays() == 0) {
// no expiry
return null;
}
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTime(creationDate);
calendar.add(Calendar.DATE, mKey.getValidDays());
return calendar.getTime();
}
public boolean isExpired() {
Date creationDate = mKey.getCreationTime();
Date expiryDate = mKey.getValidSeconds() > 0
? new Date(creationDate.getTime() + mKey.getValidSeconds() * 1000) : null;
Date now = new Date();
return creationDate.after(now) || (expiryDate != null && expiryDate.before(now));
}
public boolean isMasterKey() {
return mKey.isMasterKey();
}
public int getAlgorithm() {
return mKey.getAlgorithm();
}
public IterableIterator<String> getUserIds() {
return new IterableIterator<String>(mKey.getUserIDs());
}
private Integer mCacheUsage = null;
@SuppressWarnings("unchecked")
public int getKeyUsage() {
if(mCacheUsage == null) {
mCacheUsage = 0;
if (mKey.getVersion() >= 4) {
for (PGPSignature sig : new IterableIterator<PGPSignature>(mKey.getSignatures())) {
if (mKey.isMasterKey() && sig.getKeyID() != mKey.getKeyID()) {
continue;
}
PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
if (hashed != null) {
mCacheUsage |= hashed.getKeyFlags();
}
PGPSignatureSubpacketVector unhashed = sig.getUnhashedSubPackets();
if (unhashed != null) {
mCacheUsage |= unhashed.getKeyFlags();
}
}
}
}
return mCacheUsage;
}
public boolean canAuthenticate() {
return mKey.getVersion() <= 3 || (getKeyUsage() & KeyFlags.AUTHENTICATION) != 0;
}
public boolean canCertify() {
return mKey.getVersion() <= 3 || (getKeyUsage() & KeyFlags.CERTIFY_OTHER) != 0;
}
public boolean canEncrypt() {
if (!mKey.isEncryptionKey()) {
return false;
}
// special cases
if (mKey.getAlgorithm() == PGPPublicKey.ELGAMAL_ENCRYPT) {
return true;
}
if (mKey.getAlgorithm() == PGPPublicKey.RSA_ENCRYPT) {
return true;
}
return mKey.getVersion() <= 3 ||
(getKeyUsage() & (KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE)) != 0;
}
public boolean canSign() {
// special case
if (mKey.getAlgorithm() == PGPPublicKey.RSA_SIGN) {
return true;
}
return mKey.getVersion() <= 3 || (getKeyUsage() & KeyFlags.SIGN_DATA) != 0;
}
public CachedKeyRing getKeyRing() {
return mRing;
}
JcePublicKeyKeyEncryptionMethodGenerator getPubKeyEncryptionGenerator() {
return new JcePublicKeyKeyEncryptionMethodGenerator(mKey);
}
public void initSignature(PGPSignature sig) throws PGPException {
JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
new JcaPGPContentVerifierBuilderProvider()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
sig.init(contentVerifierBuilderProvider, mKey);
}
public void initSignature(PGPOnePassSignature sig) throws PGPException {
JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
new JcaPGPContentVerifierBuilderProvider()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
sig.init(contentVerifierBuilderProvider, mKey);
}
/** Verify a signature for this pubkey, after it has been initialized by the signer using
* initSignature(). This method should probably move into a wrapped PGPSignature class
* at some point.
*/
public boolean verifySignature(PGPSignature sig, String uid) throws PGPException {
try {
return sig.verifyCertification(uid, mKey);
} catch (SignatureException e) {
throw new PGPException("Error!", e);
}
}
public byte[] getFingerprint() {
return mKey.getFingerprint();
}
// Note that this method has package visibility - no access outside the pgp package!
PGPPublicKey getKey() {
return mKey;
}
}
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