/**
* Replace the passed the public key on the passed in secret key.
*
* @param secretKey secret key to change
* @param publicKey new public key.
* @return a new secret key.
* @throws IllegalArgumentException if keyIDs do not match.
*/
public static PGPSecretKey replacePublicKey(PGPSecretKey secretKey, PGPPublicKey publicKey) {
if (publicKey.getKeyID() != secretKey.getKeyID()) {
throw new IllegalArgumentException("keyIDs do not match");
}
return new PGPSecretKey(secretKey.secret, publicKey);
}
/**
* Returns the secret key matching the specified identifier.
*
* @param input the input stream containing the keyring collection
* @param keyId the 4 bytes identifier of the key
*/
private static PGPSecretKey getSecretKey(InputStream input, String keyId)
throws IOException, PGPException {
PGPSecretKeyRingCollection keyrings =
new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(input));
Iterator rIt = keyrings.getKeyRings();
while (rIt.hasNext()) {
PGPSecretKeyRing kRing = (PGPSecretKeyRing) rIt.next();
Iterator kIt = kRing.getSecretKeys();
while (kIt.hasNext()) {
PGPSecretKey key = (PGPSecretKey) kIt.next();
if (key.isSigningKey()
&& Long.toHexString(key.getKeyID() & 0xFFFFFFFFL).equals(keyId.toLowerCase())) {
return key;
}
}
}
return null;
}