Example usage for org.bouncycastle.bcpg RSAPublicBCPGKey getPublicExponent

Introduction

In this page you can find the example usage for org.bouncycastle.bcpg RSAPublicBCPGKey getPublicExponent.

Prototype

public BigInteger getPublicExponent() 

Source Link

Usage

From source file:bisq.common.crypto.PGP.java

License:Open Source License

@Nullable
public static PGPPublicKey getPubKeyFromPem(@Nullable String pem) {
    if (pem != null) {
        InputStream inputStream = new ByteArrayInputStream(pem.getBytes(Charsets.UTF_8));
        try {//w w w . j a  va 2 s .c  o m
            inputStream = PGPUtil.getDecoderStream(inputStream);
            try {
                JcaPGPPublicKeyRingCollection ringCollection = new JcaPGPPublicKeyRingCollection(inputStream);
                Iterator<PGPPublicKeyRing> keyRingsIterator = ringCollection.getKeyRings();
                while (keyRingsIterator.hasNext()) {
                    PGPPublicKeyRing pgpPublicKeyRing = keyRingsIterator.next();
                    Iterator<PGPPublicKey> pubKeysIterator = pgpPublicKeyRing.getPublicKeys();
                    while (pubKeysIterator.hasNext()) {
                        final PGPPublicKey pgpPublicKey = pubKeysIterator.next();
                        if ((pgpPublicKey).isEncryptionKey()) {
                            log.debug(pgpPublicKey.getClass().getName() + " KeyID: "
                                    + Long.toHexString(pgpPublicKey.getKeyID()) + " type: "
                                    + pgpPublicKey.getAlgorithm() + " fingerprint: "
                                    + new String(Hex.encode(pgpPublicKey.getFingerprint())));

                            BCPGKey bcKey = pgpPublicKey.getPublicKeyPacket().getKey();
                            log.debug(bcKey.getClass().getName());
                            if (bcKey instanceof RSAPublicBCPGKey) {
                                RSAPublicBCPGKey bcRSA = (RSAPublicBCPGKey) bcKey;
                                RSAPublicKeySpec specRSA = new RSAPublicKeySpec(bcRSA.getModulus(),
                                        bcRSA.getPublicExponent());
                                PublicKey jceKey = KeyFactory.getInstance("RSA").generatePublic(specRSA);
                                // if you want to use the key in JCE, use jceKey
                                // if you want to write "X.509" (SPKI) DER format to a file:
                                //Files.write(new File(pubKeyAsString).toPath(), jceKey.getEncoded());
                                // if you want to write in PEM, bouncycastle can do that
                                // or you can just do base64 and add BEGIN/END lines
                                // return pubKeyAsString; // assume only one key; if need to handle multiple keys
                                // or select other than the first, specify more clearly
                            }

                            return pgpPublicKey;
                        }
                    }
                }
                return null;
            } catch (PGPException | InvalidKeySpecException | NoSuchAlgorithmException e) {
                log.error("Error creating publicKey from pem. pem={}, error={}", pem, e);
                e.printStackTrace();
                throw new KeyConversionException(e);
            }

        } catch (IOException e) {
            log.error("Error creating publicKey from pem. pem={}, error={}", pem, e);
            e.printStackTrace();
            throw new KeyConversionException(e);
        } finally {
            try {
                inputStream.close();
            } catch (IOException ignore) {
            }
        }
    } else {
        log.warn("Error creating publicKey from pem. pem=null");
        return null;
    }
}

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From source file:org.sufficientlysecure.keychain.pgp.SshPublicKey.java

License:Open Source License

private String encodeRSAKey(PGPPublicKey publicKey) {
    RSAPublicBCPGKey publicBCPGKey = (RSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey();

    SshRSAPublicKey pubkey = new SshRSAPublicKey(publicBCPGKey.getPublicExponent(), publicBCPGKey.getModulus());

    return pubkey.getPublicKeyBlob();
}

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