// 
// Decompiled by Procyon v0.6.0
// 

package com.google.crypto.tink.aead.internal;

import java.security.GeneralSecurityException;
import java.nio.ByteBuffer;
import java.security.InvalidKeyException;

public class InsecureNonceXChaCha20 extends InsecureNonceChaCha20Base
{
    public static final int NONCE_SIZE_IN_BYTES = 24;
    
    public InsecureNonceXChaCha20(final byte[] key, final int initialCounter) throws InvalidKeyException {
        super(key, initialCounter);
    }
    
    @Override
    int[] createInitialState(final int[] nonce, final int counter) {
        if (nonce.length != this.nonceSizeInBytes() / 4) {
            throw new IllegalArgumentException(String.format("XChaCha20 uses 192-bit nonces, but got a %d-bit nonce", nonce.length * 32));
        }
        final int[] state = new int[16];
        ChaCha20Util.setSigmaAndKey(state, ChaCha20Util.hChaCha20(this.key, nonce));
        state[12] = counter;
        state[13] = 0;
        state[14] = nonce[4];
        state[15] = nonce[5];
        return state;
    }
    
    @Override
    int nonceSizeInBytes() {
        return 24;
    }
}