Examples with DSAPrivateKeySpec java.security.spec.DSAPrivateKeySpec used on opensource projects

Example 21 with DSAPrivateKeySpec

use of java.security.spec.DSAPrivateKeySpec in project Conversations by siacs.

the class OtrService method loadKey.

private KeyPair loadKey(final JSONObject keys) {
    if (keys == null) {
        return null;
    }
    synchronized (keys) {
        try {
            BigInteger x = new BigInteger(keys.getString("otr_x"), 16);
            BigInteger y = new BigInteger(keys.getString("otr_y"), 16);
            BigInteger p = new BigInteger(keys.getString("otr_p"), 16);
            BigInteger q = new BigInteger(keys.getString("otr_q"), 16);
            BigInteger g = new BigInteger(keys.getString("otr_g"), 16);
            KeyFactory keyFactory = KeyFactory.getInstance("DSA");
            DSAPublicKeySpec pubKeySpec = new DSAPublicKeySpec(y, p, q, g);
            DSAPrivateKeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
            PublicKey publicKey = keyFactory.generatePublic(pubKeySpec);
            PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
            return new KeyPair(publicKey, privateKey);
        } catch (JSONException e) {
            return null;
        } catch (NoSuchAlgorithmException e) {
            return null;
        } catch (InvalidKeySpecException e) {
            return null;
        }
    }
}