package org.bouncycastle.jce.provider.test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.crypto.prng.FixedSecureRandom;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

/**
 * basic test class for the AES cipher vectors from FIPS-197
 */
public class AESTest
    extends BaseBlockCipherTest
{
    static String[] cipherTests =
    {
        "128",
        "000102030405060708090a0b0c0d0e0f",
        "00112233445566778899aabbccddeeff",
        "69c4e0d86a7b0430d8cdb78070b4c55a",
        "192",
        "000102030405060708090a0b0c0d0e0f1011121314151617",
        "00112233445566778899aabbccddeeff",
        "dda97ca4864cdfe06eaf70a0ec0d7191",
        "256",
        "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
        "00112233445566778899aabbccddeeff",
        "8ea2b7ca516745bfeafc49904b496089",
    };

    public AESTest()
    {
        super("AES");
    }

    private void test(
        int         strength,
        byte[]      keyBytes,
        byte[]      input,
        byte[]      output)
        throws Exception
    {
        Key                     key;
        Cipher                  in, out;
        CipherInputStream       cIn;
        CipherOutputStream      cOut;
        ByteArrayInputStream    bIn;
        ByteArrayOutputStream   bOut;

        key = new SecretKeySpec(keyBytes, "AES");

        in = Cipher.getInstance("AES/ECB/NoPadding", "BC");
        out = Cipher.getInstance("AES/ECB/NoPadding", "BC");
        
        try
        {
            out.init(Cipher.ENCRYPT_MODE, key);
        }
        catch (Exception e)
        {
            fail("AES failed initialisation - " + e.toString(), e);
        }

        try
        {
            in.init(Cipher.DECRYPT_MODE, key);
        }
        catch (Exception e)
        {
            fail("AES failed initialisation - " + e.toString(), e);
        }

        //
        // encryption pass
        //
        bOut = new ByteArrayOutputStream();

        cOut = new CipherOutputStream(bOut, out);

        try
        {
            for (int i = 0; i != input.length / 2; i++)
            {
                cOut.write(input[i]);
            }
            cOut.write(input, input.length / 2, input.length - input.length / 2);
            cOut.close();
        }
        catch (IOException e)
        {
            fail("AES failed encryption - " + e.toString(), e);
        }

        byte[]    bytes;

        bytes = bOut.toByteArray();

        if (!areEqual(bytes, output))
        {
            fail("AES failed encryption - expected " + new String(Hex.encode(output)) + " got " + new String(Hex.encode(bytes)));
        }

        //
        // decryption pass
        //
        bIn = new ByteArrayInputStream(bytes);

        cIn = new CipherInputStream(bIn, in);

        try
        {
            DataInputStream dIn = new DataInputStream(cIn);

            bytes = new byte[input.length];

            for (int i = 0; i != input.length / 2; i++)
            {
                bytes[i] = (byte)dIn.read();
            }
            dIn.readFully(bytes, input.length / 2, bytes.length - input.length / 2);
        }
        catch (Exception e)
        {
            fail("AES failed encryption - " + e.toString(), e);
        }

        if (!areEqual(bytes, input))
        {
            fail("AES failed decryption - expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(bytes)));
        }
    }

    private void eaxTest()
        throws Exception
    {
        byte[] K = Hex.decode("233952DEE4D5ED5F9B9C6D6FF80FF478");
        byte[] N = Hex.decode("62EC67F9C3A4A407FCB2A8C49031A8B3");
        byte[] P = Hex.decode("68656c6c6f20776f726c642121");
        byte[] C = Hex.decode("2f9f76cb7659c70e4be11670a3e193ae1bc6b5762a");

        Key                     key;
        Cipher                  in, out;

        key = new SecretKeySpec(K, "AES");

        in = Cipher.getInstance("AES/EAX/NoPadding", "BC");
        out = Cipher.getInstance("AES/EAX/NoPadding", "BC");

        in.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(N));

        byte[] enc = in.doFinal(P);
        if (!areEqual(enc, C))
        {
            fail("ciphertext doesn't match in EAX");
        }

        out.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(N));

        byte[] dec = out.doFinal(C);
        if (!areEqual(dec, P))
        {
            fail("plaintext doesn't match in EAX");
        }

        try
        {
            in = Cipher.getInstance("AES/EAX/PKCS5Padding", "BC");

            fail("bad padding missed in EAX");
        }
        catch (NoSuchPaddingException e)
        {
            // expected
        }
    }

    private void ccmTest()
        throws Exception
    {
        byte[] K = Hex.decode("404142434445464748494a4b4c4d4e4f");
        byte[] N = Hex.decode("10111213141516");
        byte[] P = Hex.decode("68656c6c6f20776f726c642121");
        byte[] C = Hex.decode("39264f148b54c456035de0a531c8344f46db12b388");

        Key                     key;
        Cipher                  in, out;

        key = new SecretKeySpec(K, "AES");

        in = Cipher.getInstance("AES/CCM/NoPadding", "BC");
        out = Cipher.getInstance("AES/CCM/NoPadding", "BC");

        in.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(N));

        byte[] enc = in.doFinal(P);
        if (!areEqual(enc, C))
        {
            fail("ciphertext doesn't match in CCM");
        }

        out.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(N));

        byte[] dec = out.doFinal(C);
        if (!areEqual(dec, P))
        {
            fail("plaintext doesn't match in CCM");
        }

        try
        {
            in = Cipher.getInstance("AES/CCM/PKCS5Padding", "BC");

            fail("bad padding missed in CCM");
        }
        catch (NoSuchPaddingException e)
        {
            // expected
        }
    }

    private void gcmTest()
        throws Exception
    {
        // Test Case 15 from McGrew/Viega
        byte[] K = Hex.decode(
              "feffe9928665731c6d6a8f9467308308"
            + "feffe9928665731c6d6a8f9467308308");
        byte[] P = Hex.decode(
              "d9313225f88406e5a55909c5aff5269a"
            + "86a7a9531534f7da2e4c303d8a318a72"
            + "1c3c0c95956809532fcf0e2449a6b525"
            + "b16aedf5aa0de657ba637b391aafd255");
        byte[] N = Hex.decode("cafebabefacedbaddecaf888");
        String T = "b094dac5d93471bdec1a502270e3cc6c";
        byte[] C = Hex.decode(
              "522dc1f099567d07f47f37a32a84427d"
            + "643a8cdcbfe5c0c97598a2bd2555d1aa"
            + "8cb08e48590dbb3da7b08b1056828838"
            + "c5f61e6393ba7a0abcc9f662898015ad"
            + T);

        Key                     key;
        Cipher                  in, out;

        key = new SecretKeySpec(K, "AES");

        in = Cipher.getInstance("AES/GCM/NoPadding", "BC");
        out = Cipher.getInstance("AES/GCM/NoPadding", "BC");

        in.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(N));

        byte[] enc = in.doFinal(P);
        if (!areEqual(enc, C))
        {
            fail("ciphertext doesn't match in GCM");
        }

        out.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(N));

        byte[] dec = out.doFinal(C);
        if (!areEqual(dec, P))
        {
            fail("plaintext doesn't match in GCM");
        }

        try
        {
            in = Cipher.getInstance("AES/GCM/PKCS5Padding", "BC");
    
            fail("bad padding missed in GCM");
        }
        catch (NoSuchPaddingException e)
        {
            // expected
        }
    }

    private void ocbTest()
        throws Exception
    {
        byte[] K = Hex.decode(
              "000102030405060708090A0B0C0D0E0F");
        byte[] P = Hex.decode(
              "000102030405060708090A0B0C0D0E0F");
        byte[] N = Hex.decode("000102030405060708090A0B");
        String T = "4CBB3E4BD6B456AF";
        byte[] C = Hex.decode(
            "BEA5E8798DBE7110031C144DA0B2612213CC8B747807121A" + T);

        Key                     key;
        Cipher                  in, out;

        key = new SecretKeySpec(K, "AES");

        in = Cipher.getInstance("AES/OCB/NoPadding", "BC");
        out = Cipher.getInstance("AES/OCB/NoPadding", "BC");

        in.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(N));

        byte[] enc = in.doFinal(P);
        if (!areEqual(enc, C))
        {
            fail("ciphertext doesn't match in OCB");
        }

        out.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(N));

        byte[] dec = out.doFinal(C);
        if (!areEqual(dec, P))
        {
            fail("plaintext doesn't match in OCB");
        }

        try
        {
            in = Cipher.getInstance("AES/OCB/PKCS5Padding", "BC");

            fail("bad padding missed in OCB");
        }
        catch (NoSuchPaddingException e)
        {
            // expected
        }
    }

    public void performTest()
        throws Exception
    {
        for (int i = 0; i != cipherTests.length; i += 4)
        {
            test(Integer.parseInt(cipherTests[i]), 
                            Hex.decode(cipherTests[i + 1]),
                            Hex.decode(cipherTests[i + 2]),
                            Hex.decode(cipherTests[i + 3]));
        }

        byte[]  kek1 = Hex.decode("000102030405060708090a0b0c0d0e0f");
        byte[]  in1 = Hex.decode("00112233445566778899aabbccddeeff");
        byte[]  out1 = Hex.decode("1fa68b0a8112b447aef34bd8fb5a7b829d3e862371d2cfe5");
        
        wrapTest(1, "AESWrap", kek1, in1, out1);

        byte[]  kek2 = Hex.decode("000102030405060708090a0b0c0d0e0f");
        byte[]  in2 = Hex.decode("00112233445566778899aabbccddeeff");
        byte[]  out2 = Hex.decode("7c8798dfc802553b3f00bb4315e3a087322725c92398b9c112c74d0925c63b61");

        wrapTest(2, "AESRFC3211WRAP", kek2,  kek2, new FixedSecureRandom(Hex.decode("9688df2af1b7b1ac9688df2a")), in2, out2);

        byte[] kek3 = Hex.decode("5840df6e29b02af1ab493b705bf16ea1ae8338f4dcc176a8");
        byte[] in3 = Hex.decode("c37b7e6492584340bed12207808941155068f738");
        byte[] out3 = Hex.decode("138bdeaa9b8fa7fc61f97742e72248ee5ae6ae5360d1ae6a5f54f373fa543b6a");

        wrapTest(3, "AESRFC5649WRAP", kek3, in3, out3);

        String[] oids = {
                NISTObjectIdentifiers.id_aes128_ECB.getId(),
                NISTObjectIdentifiers.id_aes128_CBC.getId(),
                NISTObjectIdentifiers.id_aes128_OFB.getId(),
                NISTObjectIdentifiers.id_aes128_CFB.getId(),
                NISTObjectIdentifiers.id_aes192_ECB.getId(),
                NISTObjectIdentifiers.id_aes192_CBC.getId(),
                NISTObjectIdentifiers.id_aes192_OFB.getId(),
                NISTObjectIdentifiers.id_aes192_CFB.getId(),
                NISTObjectIdentifiers.id_aes256_ECB.getId(),
                NISTObjectIdentifiers.id_aes256_CBC.getId(),
                NISTObjectIdentifiers.id_aes256_OFB.getId(),
                NISTObjectIdentifiers.id_aes256_CFB.getId()
        };

        String[] names = {
                "AES/ECB/PKCS7Padding",
                "AES/CBC/PKCS7Padding",
                "AES/OFB/NoPadding",
                "AES/CFB/NoPadding",
                "AES/ECB/PKCS7Padding",
                "AES/CBC/PKCS7Padding",
                "AES/OFB/NoPadding",
                "AES/CFB/NoPadding",
                "AES/ECB/PKCS7Padding",
                "AES/CBC/PKCS7Padding",
                "AES/OFB/NoPadding",
                "AES/CFB/NoPadding"
        };

        oidTest(oids, names, 4);


        String[] wrapOids = {
                NISTObjectIdentifiers.id_aes128_wrap.getId(),
                NISTObjectIdentifiers.id_aes192_wrap.getId(),
                NISTObjectIdentifiers.id_aes256_wrap.getId()
        };

        wrapOidTest(wrapOids, "AESWrap");

        eaxTest();
        ccmTest();
        gcmTest();
        ocbTest();
    }

    public static void main(
        String[]    args)
    {
        Security.addProvider(new BouncyCastleProvider());

        runTest(new AESTest());
    }
}
