How to store and read PGP public keys as strings using Java's Bouncycastle?

Question

I am trying to create, encode, store, retrieve and decode the PGP Bouncy Castle public key. I get what seems to be the wrong output, and an EOFException when I try to read the key back. The key will be stored in the database as a string.

The RSA public encryption public key is retrieved from the key ring as follows:

@SuppressWarnings("unchecked")
public PGPPublicKey getPublicKey() {
    PGPPublicKey pk = null;
    Iterator<PGPPublicKey> it = publicKeyRing.getPublicKeys();
    while (pk == null && it.hasNext()) {
        PGPPublicKey key = it.next();
        if (key.isEncryptionKey()) {
            pk = key;
        }
    }
    return pk;
}

It is encoded, ASCII armored and stored as a string as follows:

    PGPPublicKey contactPK = realContact.getPublicKey();
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ArmoredOutputStream armored = new ArmoredOutputStream(out);
    contactPK.encode(armored);
    armored.close();
    publicKey = new String(out.toByteArray(), Charset.forName("US-ASCII"));

This gets me a PGP message block, where I expect a PGP public key lock:

----- BEGIN PGP MESSAGE -----\nVersion: BCPG v1.50\N\nuQINBFO8StkCEACQ4vrDnBTDjEvQkGwrAHuJSBZL8tNLxhZ9B74afhObhLVzW6ZB\nT3pk/5XcSPOTvcWd9k1yOKJUabCuF5ixFmMz + niFqUVQTtnl7aqOZ + GrDEzmoYmG\nNQROP0EiA1TWtm2 + Ja0FqiJauXytt1sIF/Pr5L47FCjtmZKVoXTP8RVFfGLPB0kT\ndjOz53PaEE3GSValh85w24XIH2/gczURUnjphCX1bRwTFr14SfA9X/rFWqv9SqWQ\nV8OiIWrSiwNd5RLJ9q0B + viDzoxrjmnMJZikxhKiuNVKJCu2ccBdMrbW42iBM2w3\

... ( )

\n ----- END PGP MESSAGE -----

, , EOFException:

// Import the public key.
ByteArrayInputStream in =
        new ByteArrayInputStream(stored.publicKey.getBytes(
                                                    Charset.forName("US-ASCII")));
// Needed to read ASCII armored keys
InputStream decoded = PGPUtil.getDecoderStream(in);
BCPGInputStream bcpgIn = new BCPGInputStream(decoded);
RSAPublicBCPGKey bcpgKey = new RSAPublicBCPGKey(bcpgIn);
PublicKeyPacket pkPacket = new PublicKeyPacket(PublicKeyAlgorithmTags.RSA_ENCRYPT,
                                                new Date(), bcpgKey);
publicKey = new PGPPublicKey(pkPacket, new BcKeyFingerprintCalculator());

, RSAPublicBCPGKey.

- , , . - ?

Answer 1

, , Public Key Ring . , subkeys ( ). , .

, realContact , , getPublicKey().

Answer 2

, pgp (ascii armored) String str:

    InputStream in=new ByteArrayInputStream(str.getBytes());
    in = org.bouncycastle.openpgp.PGPUtil.getDecoderStream(in);

    JcaPGPPublicKeyRingCollection pgpPub = new JcaPGPPublicKeyRingCollection(in);
    in.close();

    PGPPublicKey key = null;
    Iterator<PGPPublicKeyRing> rIt = pgpPub.getKeyRings();
    while (key == null && rIt.hasNext())
    {
        PGPPublicKeyRing kRing = rIt.next();
        Iterator<PGPPublicKey> kIt = kRing.getPublicKeys();
        while (key == null && kIt.hasNext())
        {
            PGPPublicKey k = kIt.next();

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

PGPPublicKey.