Examples with ECPublicKeyParameters org.openecard.bouncycastle.crypto.params.ECPublicKeyParameters used on opensource projects

Example 6 with ECPublicKeyParameters

use of org.openecard.bouncycastle.crypto.params.ECPublicKeyParameters in project open-ecard by ecsec.

the class CAKey method generateKeyPair.

/**
 * Generate a key pair.
 */
public void generateKeyPair() {
    reseed();
    if (cdp.isDH()) {
        ElGamalParameterSpec p = (ElGamalParameterSpec) cdp.getParameter();
        int numBits = p.getG().bitLength();
        BigInteger d = new BigInteger(numBits, rand);
        ElGamalParameters egp = new ElGamalParameters(p.getP(), p.getG());
        sk = new ElGamalPrivateKeyParameters(d, egp);
        pk = new ElGamalPublicKeyParameters(egp.getG().multiply(d), egp);
    } else if (cdp.isECDH()) {
        ECParameterSpec p = (ECParameterSpec) cdp.getParameter();
        int numBits = p.getN().bitLength();
        BigInteger d = new BigInteger(numBits, rand);
        ECDomainParameters ecp = new ECDomainParameters(p.getCurve(), p.getG(), p.getN(), p.getH());
        sk = new ECPrivateKeyParameters(d, ecp);
        pk = new ECPublicKeyParameters(ecp.getG().multiply(d), ecp);
    } else {
        throw new IllegalArgumentException();
    }
}