org.spongycastle.crypto.ec.ECUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of core Show documentation

Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

The newest version!

package org.spongycastle.crypto.ec;

import java.math.BigInteger;
import java.security.SecureRandom;

import org.spongycastle.math.ec.ECConstants;

class ECUtil
{
    static BigInteger generateK(BigInteger n, SecureRandom random)
    {
        int nBitLength = n.bitLength();
        BigInteger k;
        do
        {
            k = new BigInteger(nBitLength, random);
        }
        while (k.equals(ECConstants.ZERO) || (k.compareTo(n) >= 0));
        return k;
    }
}