org.bouncycastle.pqc.crypto.sphincs.Seed Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-ext-debug-jdk18on Show documentation

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 Java 1.8 and later with debug enabled.

The newest version!

package org.bouncycastle.pqc.crypto.sphincs;

import org.bouncycastle.crypto.StreamCipher;
import org.bouncycastle.crypto.engines.ChaChaEngine;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.util.Pack;

class Seed
{

    static void get_seed(HashFunctions hs, byte[] seed, int seedOff, byte[] sk, Tree.leafaddr a)
    {
        byte[] buffer = new byte[SPHINCS256Config.SEED_BYTES + 8];
        long t;
        int i;

        for (i = 0; i < SPHINCS256Config.SEED_BYTES; i++)
        {
            buffer[i] = sk[i];
        }

        //4 bits to encode level
        t = a.level;
        //55 bits to encode subtree
        t |= a.subtree << 4;
        //5 bits to encode leaf
        t |= a.subleaf << 59;

        Pack.longToLittleEndian(t, buffer, SPHINCS256Config.SEED_BYTES);

        hs.varlen_hash(seed, seedOff, buffer, buffer.length);
    }



    static void prg(byte[] r, int rOff, long rlen, byte[] key, int keyOff)
    {
        byte[]  nonce = new byte[8];

        StreamCipher cipher = new ChaChaEngine(12);

        cipher.init(true, new ParametersWithIV(new KeyParameter(key, keyOff, 32), nonce));

        cipher.processBytes(r, rOff, (int)rlen, r, rOff);

        //crypto_stream_chacha12(r, rlen, nonce, key);
    }
}