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

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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.

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package org.spongycastle.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));
    }
}