public static ECPublicKey PrivateKeytoECPublicKey(byte[] privateKey)
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeySpecException {
KeyPairGenerator kpg = null;
kpg = KeyPairGenerator.getInstance("EC");
ECGenParameterSpec gps = new ECGenParameterSpec("secp256k1"); // NIST P-256
kpg.initialize(gps);
KeyPair apair = kpg.generateKeyPair();
ECPublicKey apub = (ECPublicKey) apair.getPublic();
ECParameterSpec aspec = apub.getParams();
byte[] publicKeyb = Address.privateKeyToPublicKey(Utils.toHex(privateKey), false);
byte[] publicKeybx = new byte[32];
byte[] publicKeyby = new byte[32];
System.arraycopy(publicKeyb, 1, publicKeybx, 0, 32);
System.arraycopy(publicKeyb, 33, publicKeyby, 0, 32);
BigInteger x = new BigInteger(1, publicKeybx);
BigInteger y = new BigInteger(1, publicKeyby);
java.security.spec.ECPoint cpoint = new java.security.spec.ECPoint(x, y);
ECPublicKeySpec cpubs = new ECPublicKeySpec(cpoint, aspec);
ECPublicKey cpub = null;
KeyFactory kfa = null;
kfa = KeyFactory.getInstance("EC");
return cpub = (ECPublicKey) kfa.generatePublic(cpubs);
}
public static ECPrivateKey WIFtoECPrivateKey(String wif)
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeySpecException {
// byte [] privateKey =
// Address.wifToPrivateKey("5Kb6aGpijtrb8X28GzmWtbcGZCG8jHQWFJcWugqo3MwKRvC8zyu");
byte[] privateKey = Address.wifToPrivateKey(wif);
return PrivateKeytoECPrivateKey(privateKey);
}
public static ECPublicKey WIFtoECPublicKey(String wif)
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeySpecException {
byte[] privateKey = Address.wifToPrivateKey(wif);
return PrivateKeytoECPublicKey(privateKey);
}