org.bouncycastle.pqc.crypto.sphincsplus.SIG 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.sphincsplus;

class SIG
{
    private final byte[] r;
    private final SIG_FORS[] sig_fors;
    private final SIG_XMSS[] sig_ht;

    public SIG(int n, int k, int a, int d, int hPrime, int wots_len, byte[] signature)
    {
        this.r = new byte[n];
        System.arraycopy(signature, 0, r, 0, n);

        this.sig_fors = new SIG_FORS[k];
        int offset = n;
        for (int i = 0; i != k; i++)
        {
            byte[] sk = new byte[n];
            System.arraycopy(signature, offset, sk, 0, n);
            offset += n;
            byte[][] authPath = new byte[a][];
            for (int j = 0; j != a; j++)
            {
                authPath[j] = new byte[n];
                System.arraycopy(signature, offset, authPath[j], 0, n);
                offset += n;
            }
            sig_fors[i] = new SIG_FORS(sk, authPath);
        }

        sig_ht = new SIG_XMSS[d];
        for (int i = 0; i != d; i++)
        {
            byte[] sig = new byte[wots_len * n];
            System.arraycopy(signature, offset, sig, 0, sig.length);
            offset += sig.length;
            byte[][] authPath = new byte[hPrime][];
            for (int j = 0; j != hPrime; j++)
            {
                authPath[j] = new byte[n];
                System.arraycopy(signature, offset, authPath[j], 0, n);
                offset += n;
            }
            sig_ht[i] = new SIG_XMSS(sig, authPath);
        }
        if (offset != signature.length)
        {
            throw new IllegalArgumentException("signature wrong length");
        }
    }

    public byte[] getR()
    {
        return r;
    }

    public SIG_FORS[] getSIG_FORS()
    {
        return sig_fors;
    }

    public SIG_XMSS[] getSIG_HT()
    {
        return sig_ht;
    }
}