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package org.openjdk.bench.javax.crypto.full;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.Param;

import org.openjdk.jmh.annotations.Setup;

import javax.crypto.*;

import javax.crypto.spec.*;

import java.security.*;

import java.security.spec.*;

public abstract class CipherBench extends CryptoBase {

    @Param({})

    private String permutation;

    @Param({})

    private String mode;

    @Param({})

    private String padding;

    @Param({})

    private int keyLength;

    @Param({})

    private int dataSize;

    private int decryptCount = 0;

    private byte[] data;

    private byte[][] encryptedData = new byte[2][];

    private byte[] outBuffer;

    private Cipher[] encryptCipher = new Cipher[2];

    private Cipher decryptCipher;

    protected SecretKeySpec ks;

    protected byte[] iv;

    protected abstract int ivLength();

    protected abstract AlgorithmParameterSpec makeParameterSpec();

    protected void init(Cipher c, int mode, SecretKeySpec ks)

        throws GeneralSecurityException {

        if (iv == null) {

            iv = fillSecureRandom(new byte[ivLength()]);

        }

        // toggle some bits in the IV to get around IV reuse defenses

        iv[0] ^= 0xFF;

        AlgorithmParameterSpec paramSpec = makeParameterSpec();

        c.init(mode, ks, paramSpec);

    }

    protected void init(Cipher c, int mode, SecretKeySpec ks, Cipher fromCipher)

        throws GeneralSecurityException {

        AlgorithmParameters params = fromCipher.getParameters();

        c.init(mode, ks, fromCipher.getParameters());

    }

    @Setup

    public void setup() throws GeneralSecurityException {

        setupProvider();

        String transform = permutation + "/" + mode + "/" + padding;

        byte[] keystring = fillSecureRandom(new byte[keyLength / 8]);

        ks = new SecretKeySpec(keystring, permutation);

        data = fillRandom(new byte[dataSize]);

        for (int i = 0; i < 2; i++) {

            encryptCipher[i] = makeCipher(prov, transform);

            init(encryptCipher[i], Cipher.ENCRYPT_MODE, ks);

            encryptedData[i] = encryptCipher[i].doFinal(data);

        }

        outBuffer = new byte[dataSize + 128]; // extra space for tag, etc

        decryptCipher = makeCipher(prov, transform);

    }

    @Benchmark

    public void encrypt() throws GeneralSecurityException {

        init(encryptCipher[1], Cipher.ENCRYPT_MODE, ks);

        encryptCipher[1].doFinal(data, 0, data.length, outBuffer);

    }

    @Benchmark

    public void decrypt() throws GeneralSecurityException {

        init(decryptCipher, Cipher.DECRYPT_MODE, ks,

            encryptCipher[decryptCount]);

        decryptCipher.doFinal(encryptedData[decryptCount], 0,

            encryptedData[decryptCount].length, outBuffer);

        decryptCount = (decryptCount + 1) % 2;

    }

    public static class GCM extends CipherBench {

        @Param({"AES"})

        private String permutation;

        @Param({"GCM"})

        private String mode;

        private String padding;

        @Param({"128", "256"})

        private int keyLength;

        @Param({"1024", "" + 16 * 1024})

        private int dataSize;

        protected int ivLength() {

            return 32;

        }

        protected AlgorithmParameterSpec makeParameterSpec() {

            return new GCMParameterSpec(96, iv, 0, 16);

        }

        private byte[] aad;

        protected void init(Cipher c, int mode, SecretKeySpec ks)

            throws GeneralSecurityException {

            if (aad == null) {

                aad = fillSecureRandom(new byte[5]);

            }

            super.init(c, mode, ks);

            c.updateAAD(aad);

        }

        protected void init(Cipher c, int mode, SecretKeySpec ks,

            Cipher fromCipher) throws GeneralSecurityException {

            super.init(c, mode, ks, fromCipher);

            c.updateAAD(aad);

        }

    }

    public static class CTR extends CipherBench {

        @Param({"AES"})

        private String permutation;

        @Param({"CTR"})

        private String mode;

        @Param({"NoPadding"})

        private String padding;

        @Param({"128", "256"})

        private int keyLength;

        @Param({"1024", "" + 16 * 1024})

        private int dataSize;

        protected int ivLength() {

            return 16;

        }

        protected AlgorithmParameterSpec makeParameterSpec() {

            return new IvParameterSpec(iv);

        }

    }

    public static class ChaCha20Poly1305 extends CipherBench {

        @Param({"ChaCha20-Poly1305"})

        private String permutation;

        @Param({"None"})

        private String mode;

        @Param({"NoPadding"})

        private String padding;

        @Param({"256"})

        private int keyLength;

        @Param({"1024", "" + 16 * 1024})

        private int dataSize;

        protected int ivLength() {

            return 12;

        }

        protected AlgorithmParameterSpec makeParameterSpec() {

            return new IvParameterSpec(iv);

        }

    }

    public static class ChaCha20 extends CipherBench {

        @Param({"ChaCha20"})

        private String permutation;

        @Param({"None"})

        private String mode;

        @Param({"NoPadding"})

        private String padding;

        @Param({"256"})

        private int keyLength;

        @Param({"1024", "" + 16 * 1024})

        private int dataSize;

        protected int ivLength() {

            return 12;

        }

        protected AlgorithmParameterSpec makeParameterSpec() {

            return new ChaCha20ParameterSpec(iv, 0);

        }

        protected void init(Cipher c, int mode, SecretKeySpec ks,

            Cipher fromCipher) throws GeneralSecurityException {

            AlgorithmParameterSpec paramSpec =

                new ChaCha20ParameterSpec(fromCipher.getIV(), 0);

            c.init(mode, ks, paramSpec);

        }

    }

}