org.bouncycastle.jcajce.provider.asymmetric.util.PrimeCertaintyCalculator Maven / Gradle / Ivy

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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.8 and up.

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package org.bouncycastle.jcajce.provider.asymmetric.util;

public class PrimeCertaintyCalculator
{
    private PrimeCertaintyCalculator()
    {

    }

    /**
     * Return the current wisdom on prime certainty requirements.
     *
     * @param keySizeInBits size of the key being generated.
     * @return a certainty value.
     */
    public static int getDefaultCertainty(int keySizeInBits)
    {
        // Based on FIPS 186-4 Table C.1
        return keySizeInBits <= 1024 ? 80 : (96 + 16 * ((keySizeInBits - 1) / 1024));
    }
}