@SuppressWarnings("unchecked")
public static boolean isSigningKey(PGPPublicKey key) {
if (key.getVersion() <= 3) {
return true;
}
// special case
if (key.getAlgorithm() == PGPPublicKey.RSA_SIGN) {
return true;
}
for (PGPSignature sig : new IterableIterator<PGPSignature>(key.getSignatures())) {
if (key.isMasterKey() && sig.getKeyID() != key.getKeyID()) {
continue;
}
PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
if (hashed != null && (hashed.getKeyFlags() & KeyFlags.SIGN_DATA) != 0) {
return true;
}
PGPSignatureSubpacketVector unhashed = sig.getUnhashedSubPackets();
if (unhashed != null && (unhashed.getKeyFlags() & KeyFlags.SIGN_DATA) != 0) {
return true;
}
}
return false;
}
@SuppressWarnings("unchecked")
public static boolean isCertificationKey(PGPPublicKey key) {
if (key.getVersion() <= 3) {
return true;
}
for (PGPSignature sig : new IterableIterator<PGPSignature>(key.getSignatures())) {
if (key.isMasterKey() && sig.getKeyID() != key.getKeyID()) {
continue;
}
PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
if (hashed != null && (hashed.getKeyFlags() & KeyFlags.CERTIFY_OTHER) != 0) {
return true;
}
PGPSignatureSubpacketVector unhashed = sig.getUnhashedSubPackets();
if (unhashed != null && (unhashed.getKeyFlags() & KeyFlags.CERTIFY_OTHER) != 0) {
return true;
}
}
return false;
}
@SuppressWarnings("unchecked")
public static boolean isEncryptionKey(PGPPublicKey key) {
if (!key.isEncryptionKey()) {
return false;
}
if (key.getVersion() <= 3) {
// this must be true now
return key.isEncryptionKey();
}
// special cases
if (key.getAlgorithm() == PGPPublicKey.ELGAMAL_ENCRYPT) {
return true;
}
if (key.getAlgorithm() == PGPPublicKey.RSA_ENCRYPT) {
return true;
}
for (PGPSignature sig : new IterableIterator<PGPSignature>(key.getSignatures())) {
if (key.isMasterKey() && sig.getKeyID() != key.getKeyID()) {
continue;
}
PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
if (hashed != null
&& (hashed.getKeyFlags() & (KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE)) != 0) {
return true;
}
PGPSignatureSubpacketVector unhashed = sig.getUnhashedSubPackets();
if (unhashed != null
&& (unhashed.getKeyFlags() & (KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE)) != 0) {
return true;
}
}
return false;
}