ECC key pair - how to print private key?
nistelrooy41001662
I implement "Key Pair Generation" using secp192r1 curve. But private key did not display in string form like public key.
Here is my code:
package lam.bk;
import java.security.*;
import java.security.spec.*;
public class ECCKeyGeneration {
public static void main(String[] args) throws Exception {
KeyPairGenerator kpg;
kpg = KeyPairGenerator.getInstance("EC","SunEC");
ECGenParameterSpec ecsp;
ecsp = new ECGenParameterSpec("secp192r1");
kpg.initialize(ecsp);
KeyPair kp = kpg.genKeyPair();
PrivateKey privKey = kp.getPrivate();
PublicKey pubKey = kp.getPublic();
System.out.println(pubKey.toString());
System.out.println(privKey.toString());
}
}
Justinas Jakavonis
The code below will output 24 bytes private key for secp192r1 curve:
private String getPrivateKeyAsHex(PrivateKey privateKey) {
ECPrivateKey ecPrivateKey = (ECPrivateKey) privateKey;
byte[] privateKeyBytes = new byte[24];
writeToStream(privateKeyBytes, 0, ecPrivateKey.getS(), 24);
return Hex.toHexString(privateKeyBytes);
}
private void writeToStream(byte[] stream, int start, BigInteger value, int size) {
byte[] data = value.toByteArray();
int length = Math.min(size, data.length);
int writeStart = start + size - length;
int readStart = data.length - length;
System.arraycopy(data, readStart, stream, writeStart, length);
}
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