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

Example 1 with ECDomainParameters

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

the class PACEKey method generateKeyPair.

/**
 * Generate a key pair.
 */
public void generateKeyPair() {
    reseed();
    if (pdp.isDH()) {
        ElGamalParameterSpec p = (ElGamalParameterSpec) pdp.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 (pdp.isECDH()) {
        ECParameterSpec p = (ECParameterSpec) pdp.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();
    }
}

Example 2 with ECDomainParameters

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

the class PACEKey method decodePublicKey.

/**
 * Decodes a public key from a byte array.
 *
 * @param data Encoded key
 * @return Decoded key
 * @throws Exception
 */
public byte[] decodePublicKey(byte[] data) throws Exception {
    byte[] keyBytes;
    if (data[0] == (byte) 0x7C) {
        keyBytes = TLV.fromBER(data).getChild().getValue();
    } else if (data[0] != 04) {
        keyBytes = ByteUtils.concatenate((byte) 0x04, data);
    } else {
        keyBytes = data;
    }
    if (pdp.isECDH()) {
        ECParameterSpec p = (ECParameterSpec) pdp.getParameter();
        ECDomainParameters ecp = new ECDomainParameters(p.getCurve(), p.getG(), p.getN(), p.getH());
        ECPoint q = p.getCurve().decodePoint(keyBytes);
        pk = new ECPublicKeyParameters(q, ecp);
        return getEncodedPublicKey();
    } else if (pdp.isDH()) {
        logger.error("Not implemented yet.");
        throw new UnsupportedOperationException("Not implemented yet.");
    } else {
        throw new IllegalArgumentException();
    }
}

Example 3 with ECDomainParameters

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

the class CAKey method decodePublicKey.

/**
 * Decodes a public key from a byte array.
 *
 * @param data Encoded key
 * @return Decoded key
 * @throws TLVException
 * @throws IllegalArgumentException
 */
public byte[] decodePublicKey(byte[] data) throws TLVException {
    byte[] keyBytes;
    if (data[0] == (byte) 0x7C) {
        keyBytes = TLV.fromBER(data).getChild().getValue();
    } else if (data[0] != 04) {
        keyBytes = ByteUtils.concatenate((byte) 0x04, data);
    } else {
        keyBytes = data;
    }
    if (cdp.isECDH()) {
        ECParameterSpec p = (ECParameterSpec) cdp.getParameter();
        ECDomainParameters ecp = new ECDomainParameters(p.getCurve(), p.getG(), p.getN(), p.getH());
        ECPoint q = p.getCurve().decodePoint(keyBytes);
        pk = new ECPublicKeyParameters(q, ecp);
        return getEncodedPublicKey();
    } else if (cdp.isDH()) {
        // TODO
        logger.error("Not implemented yet.");
        throw new UnsupportedOperationException("Not implemented yet.");
    } else {
        throw new IllegalArgumentException();
    }
}

Example 4 with ECDomainParameters

use of org.openecard.bouncycastle.crypto.params.ECDomainParameters 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();
    }
}