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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 1.5 to JDK 1.8.
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;
}
}