readpublickey.java

public static PGPPublicKey readPublicKey(InputStream input) throws IOException, PGPException {
	PGPPublicKeyRingCollection pgpPub = new PGPPublicKeyRingCollection(
		PGPUtil.getDecoderStream(input));

	Iterator keyRingIter = pgpPub.getKeyRings();
	while (keyRingIter.hasNext()) {
		PGPPublicKeyRing keyRing = (PGPPublicKeyRing) keyRingIter.next();

		Iterator keyIter = keyRing.getPublicKeys();
		while (keyIter.hasNext()) {
			PGPPublicKey key = (PGPPublicKey) keyIter.next();

			if (key.isEncryptionKey()) {
				return key;
			}
		}
	}

	throw new IllegalArgumentException(
		"Can't find encryption key in key ring.");
}