public PublicKey getRawPublicKey() throws SshException {
try {
PublicKey key;
String keyAlg = getString();
if (KeyPairProvider.SSH_RSA.equals(keyAlg)) {
BigInteger e = getMPInt();
BigInteger n = getMPInt();
KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
key = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
} else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
BigInteger p = getMPInt();
BigInteger q = getMPInt();
BigInteger g = getMPInt();
BigInteger y = getMPInt();
KeyFactory keyFactory = SecurityUtils.getKeyFactory("DSA");
key = keyFactory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
} else {
throw new IllegalStateException("Unsupported algorithm: " + keyAlg);
}
return key;
} catch (InvalidKeySpecException e) {
throw new SshException(e);
} catch (NoSuchAlgorithmException e) {
throw new SshException(e);
} catch (NoSuchProviderException e) {
throw new SshException(e);
}
}
public KeyPair getKeyPair() throws SshException {
try {
PublicKey pub;
PrivateKey prv;
String keyAlg = getString();
if (KeyPairProvider.SSH_RSA.equals(keyAlg)) {
BigInteger e = getMPInt();
BigInteger n = getMPInt();
BigInteger d = getMPInt();
BigInteger qInv = getMPInt();
BigInteger q = getMPInt();
BigInteger p = getMPInt();
BigInteger dP = d.remainder(p.subtract(BigInteger.valueOf(1)));
BigInteger dQ = d.remainder(q.subtract(BigInteger.valueOf(1)));
KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
pub = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
prv = keyFactory.generatePrivate(new RSAPrivateCrtKeySpec(n, e, d, p, q, dP, dQ, qInv));
} else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
BigInteger p = getMPInt();
BigInteger q = getMPInt();
BigInteger g = getMPInt();
BigInteger y = getMPInt();
BigInteger x = getMPInt();
KeyFactory keyFactory = SecurityUtils.getKeyFactory("DSA");
pub = keyFactory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
prv = keyFactory.generatePrivate(new DSAPrivateKeySpec(x, p, q, g));
} else {
throw new IllegalStateException("Unsupported algorithm: " + keyAlg);
}
return new KeyPair(pub, prv);
} catch (InvalidKeySpecException e) {
throw new SshException(e);
} catch (NoSuchAlgorithmException e) {
throw new SshException(e);
} catch (NoSuchProviderException e) {
throw new SshException(e);
}
}
