Examples with NativeBigInteger net.i2p.util.NativeBigInteger used on opensource projects

Example 6 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class SigUtil method toJavaDSAKey.

public static DSAPrivateKey toJavaDSAKey(SigningPrivateKey pk) throws GeneralSecurityException {
    KeyFactory kf = KeyFactory.getInstance("DSA");
    // x p q g
    KeySpec ks = new DSAPrivateKeySpec(new NativeBigInteger(1, pk.getData()), CryptoConstants.dsap, CryptoConstants.dsaq, CryptoConstants.dsag);
    return (DSAPrivateKey) kf.generatePrivate(ks);
}

Example 7 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class YKGenerator method generateYK.

/**
 * @return rv[0] = Y; rv[1] = K
 */
private final BigInteger[] generateYK() {
    NativeBigInteger k = null;
    BigInteger y = null;
    // long t1 = 0;
    while (k == null) {
        // t0 = Clock.getInstance().now();
        k = new NativeBigInteger(ctx.keyGenerator().getElGamalExponentSize(), ctx.random());
        // t1 = Clock.getInstance().now();
        if (BigInteger.ZERO.compareTo(k) == 0) {
            k = null;
            continue;
        }
        BigInteger kPlus2 = k.add(_two);
        if (kPlus2.compareTo(CryptoConstants.elgp) > 0)
            k = null;
    }
    // long t2 = Clock.getInstance().now();
    y = CryptoConstants.elgg.modPow(k, CryptoConstants.elgp);
    BigInteger[] yk = new BigInteger[2];
    yk[0] = y;
    yk[1] = k;
    return yk;
}

Example 8 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class ElGamalSigEngine method engineVerify.

/**
 *  @param sigBytes ASN.1 R,S
 */
@Override
protected boolean engineVerify(byte[] sigBytes) throws SignatureException {
    BigInteger elgp = key.getParams().getP();
    BigInteger pm1 = elgp.subtract(BigInteger.ONE);
    BigInteger elgg = key.getParams().getG();
    BigInteger y = ((ElGamalPublicKey) key).getY();
    if (!(y instanceof NativeBigInteger))
        y = new NativeBigInteger(y);
    byte[] data = digest.digest();
    try {
        BigInteger[] rs = SigUtil.aSN1ToBigInteger(sigBytes, 256);
        BigInteger r = rs[0];
        BigInteger s = rs[1];
        if (r.signum() != 1 || s.signum() != 1 || r.compareTo(elgp) != -1 || s.compareTo(pm1) != -1)
            return false;
        NativeBigInteger h = new NativeBigInteger(1, data);
        BigInteger modvalr = r.modPow(s, elgp);
        BigInteger modvaly = y.modPow(r, elgp);
        BigInteger modmulval = modvalr.multiply(modvaly).mod(elgp);
        BigInteger v = elgg.modPow(h, elgp);
        boolean ok = v.compareTo(modmulval) == 0;
        return ok;
    } catch (RuntimeException e) {
        throw new SignatureException("verify", e);
    }
}

Example 9 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class ElGamalSigEngine method engineSign.

/**
 *  @return ASN.1 R,S
 */
@Override
protected byte[] engineSign() throws SignatureException {
    BigInteger elgp = key.getParams().getP();
    BigInteger pm1 = elgp.subtract(BigInteger.ONE);
    BigInteger elgg = key.getParams().getG();
    BigInteger x = ((ElGamalPrivateKey) key).getX();
    if (!(x instanceof NativeBigInteger))
        x = new NativeBigInteger(x);
    byte[] data = digest.digest();
    BigInteger k;
    boolean ok;
    do {
        k = new BigInteger(2048, RandomSource.getInstance());
        ok = k.compareTo(pm1) == -1;
        ok = ok && k.compareTo(BigInteger.ONE) == 1;
        ok = ok && k.gcd(pm1).equals(BigInteger.ONE);
    } while (!ok);
    BigInteger r = elgg.modPow(k, elgp);
    BigInteger kinv = k.modInverse(pm1);
    BigInteger h = new NativeBigInteger(1, data);
    BigInteger s = (kinv.multiply(h.subtract(x.multiply(r)))).mod(pm1);
    // todo if s == 0 go around again
    byte[] rv;
    try {
        rv = SigUtil.sigBytesToASN1(r, s);
    } catch (IllegalArgumentException iae) {
        throw new SignatureException("ASN1", iae);
    }
    return rv;
}

Example 10 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class SigUtil method cvtToJavaECKey.

private static ECPrivateKey cvtToJavaECKey(SigningPrivateKey pk) throws GeneralSecurityException {
    SigType type = pk.getType();
    byte[] b = pk.getData();
    BigInteger s = new NativeBigInteger(1, b);
    // see ECConstants re: casting
    ECPrivateKeySpec ks = new ECPrivateKeySpec(s, (ECParameterSpec) type.getParams());
    KeyFactory kf = KeyFactory.getInstance("EC");
    return (ECPrivateKey) kf.generatePrivate(ks);
}