/*      $OpenBSD: igetest.c,v 1.4 2018/07/17 17:06:49 tb Exp $  */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
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 *    openssl-core@openssl.org.
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 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/aes.h>

#define TEST_SIZE       128
#define BIG_TEST_SIZE 10240

static void hexdump(FILE *f,const char *title,const unsigned char *s,int l)
    {
    int n=0;

    fprintf(f,"%s",title);
    for( ; n < l ; ++n)
                {
                if((n%16) == 0)
                        fprintf(f,"\n%04x",n);
                fprintf(f," %02x",s[n]);
                }
    fprintf(f,"\n");
    }

#define MAX_VECTOR_SIZE 64

struct ige_test
        {
        const unsigned char key[16];
        const unsigned char iv[32];
        const unsigned char in[MAX_VECTOR_SIZE];
        const unsigned char out[MAX_VECTOR_SIZE];
        const size_t length;
        const int encrypt;
        };

static struct ige_test const ige_test_vectors[] = {
{ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* key */
  { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f }, /* iv */
  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* in */
  { 0x1a, 0x85, 0x19, 0xa6, 0x55, 0x7b, 0xe6, 0x52,
    0xe9, 0xda, 0x8e, 0x43, 0xda, 0x4e, 0xf4, 0x45,
    0x3c, 0xf4, 0x56, 0xb4, 0xca, 0x48, 0x8a, 0xa3,
    0x83, 0xc7, 0x9c, 0x98, 0xb3, 0x47, 0x97, 0xcb }, /* out */
  32, AES_ENCRYPT }, /* test vector 0 */

{ { 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20,
    0x61, 0x6e, 0x20, 0x69, 0x6d, 0x70, 0x6c, 0x65 }, /* key */
  { 0x6d, 0x65, 0x6e, 0x74, 0x61, 0x74, 0x69, 0x6f,
    0x6e, 0x20, 0x6f, 0x66, 0x20, 0x49, 0x47, 0x45,
    0x20, 0x6d, 0x6f, 0x64, 0x65, 0x20, 0x66, 0x6f,
    0x72, 0x20, 0x4f, 0x70, 0x65, 0x6e, 0x53, 0x53 }, /* iv */
  { 0x4c, 0x2e, 0x20, 0x4c, 0x65, 0x74, 0x27, 0x73,
    0x20, 0x68, 0x6f, 0x70, 0x65, 0x20, 0x42, 0x65,
    0x6e, 0x20, 0x67, 0x6f, 0x74, 0x20, 0x69, 0x74,
    0x20, 0x72, 0x69, 0x67, 0x68, 0x74, 0x21, 0x0a }, /* in */
  { 0x99, 0x70, 0x64, 0x87, 0xa1, 0xcd, 0xe6, 0x13,
    0xbc, 0x6d, 0xe0, 0xb6, 0xf2, 0x4b, 0x1c, 0x7a,
    0xa4, 0x48, 0xc8, 0xb9, 0xc3, 0x40, 0x3e, 0x34,
    0x67, 0xa8, 0xca, 0xd8, 0x93, 0x40, 0xf5, 0x3b }, /* out */
  32, AES_DECRYPT }, /* test vector 1 */
};

static int run_test_vectors(void)
        {
        unsigned int n;
        int errs = 0;

        for(n=0 ; n < sizeof(ige_test_vectors)/sizeof(ige_test_vectors[0]) ; ++n)
                {
                const struct ige_test * const v = &ige_test_vectors[n];
                AES_KEY key;
                unsigned char buf[MAX_VECTOR_SIZE];
                unsigned char iv[AES_BLOCK_SIZE*2];

                assert(v->length <= MAX_VECTOR_SIZE);

                if(v->encrypt == AES_ENCRYPT)
                        AES_set_encrypt_key(v->key, 8*sizeof v->key, &key);
                else
                        AES_set_decrypt_key(v->key, 8*sizeof v->key, &key);
                memcpy(iv, v->iv, sizeof iv);
                AES_ige_encrypt(v->in, buf, v->length, &key, iv, v->encrypt);

                if(memcmp(v->out, buf, v->length))
                        {
                        printf("IGE test vector %d failed\n", n);
                        hexdump(stdout, "key", v->key, sizeof v->key);
                        hexdump(stdout, "iv", v->iv, sizeof v->iv);
                        hexdump(stdout, "in", v->in, v->length);
                        hexdump(stdout, "expected", v->out, v->length);
                        hexdump(stdout, "got", buf, v->length);

                        ++errs;
                        }

                /* try with in == out */
                memcpy(iv, v->iv, sizeof iv);
                memcpy(buf, v->in, v->length);
                AES_ige_encrypt(buf, buf, v->length, &key, iv, v->encrypt);

                if(memcmp(v->out, buf, v->length))
                        {
                        printf("IGE test vector %d failed (with in == out)\n", n);
                        hexdump(stdout, "key", v->key, sizeof v->key);
                        hexdump(stdout, "iv", v->iv, sizeof v->iv);
                        hexdump(stdout, "in", v->in, v->length);
                        hexdump(stdout, "expected", v->out, v->length);
                        hexdump(stdout, "got", buf, v->length);

                        ++errs;
                        }
                }

        return errs;
        }

int main(int argc, char **argv)
        {
        unsigned char rkey[16];
        unsigned char rkey2[16];
        AES_KEY key;
        AES_KEY key2;
        unsigned char plaintext[BIG_TEST_SIZE];
        unsigned char ciphertext[BIG_TEST_SIZE];
        unsigned char checktext[BIG_TEST_SIZE];
        unsigned char iv[AES_BLOCK_SIZE*4];
        unsigned char saved_iv[AES_BLOCK_SIZE*4];
        int err = 0;
        unsigned int n;
        unsigned matches;

        assert(BIG_TEST_SIZE >= TEST_SIZE);

        arc4random_buf(rkey, sizeof(rkey));
        arc4random_buf(plaintext, sizeof(plaintext));
        arc4random_buf(iv, sizeof(iv));
        memcpy(saved_iv, iv, sizeof(saved_iv));

        /* Forward IGE only... */

        /* Straight encrypt/decrypt */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        AES_ige_encrypt(plaintext, ciphertext, TEST_SIZE, &key, iv,
                                        AES_ENCRYPT);

        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(ciphertext, checktext, TEST_SIZE, &key, iv,
                                        AES_DECRYPT);

        if(memcmp(checktext, plaintext, TEST_SIZE))
                {
                printf("Encrypt+decrypt doesn't match\n");
                hexdump(stdout, "Plaintext", plaintext, TEST_SIZE);
                hexdump(stdout, "Checktext", checktext, TEST_SIZE);
                ++err;
                }

        /* Now check encrypt chaining works */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(plaintext, ciphertext, TEST_SIZE/2, &key, iv,
                                        AES_ENCRYPT);
        AES_ige_encrypt(plaintext+TEST_SIZE/2,
                                        ciphertext+TEST_SIZE/2, TEST_SIZE/2,
                                        &key, iv, AES_ENCRYPT);

        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(ciphertext, checktext, TEST_SIZE, &key, iv,
                                        AES_DECRYPT);

        if(memcmp(checktext, plaintext, TEST_SIZE))
                {
                printf("Chained encrypt+decrypt doesn't match\n");
                hexdump(stdout, "Plaintext", plaintext, TEST_SIZE);
                hexdump(stdout, "Checktext", checktext, TEST_SIZE);
                ++err;
                }

        /* And check decrypt chaining */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(plaintext, ciphertext, TEST_SIZE/2, &key, iv,
                                        AES_ENCRYPT);
        AES_ige_encrypt(plaintext+TEST_SIZE/2,
                                        ciphertext+TEST_SIZE/2, TEST_SIZE/2,
                                        &key, iv, AES_ENCRYPT);

        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(ciphertext, checktext, TEST_SIZE/2, &key, iv,
                                        AES_DECRYPT);
        AES_ige_encrypt(ciphertext+TEST_SIZE/2,
                                        checktext+TEST_SIZE/2, TEST_SIZE/2, &key, iv,
                                        AES_DECRYPT);

        if(memcmp(checktext, plaintext, TEST_SIZE))
                {
                printf("Chained encrypt+chained decrypt doesn't match\n");
                hexdump(stdout, "Plaintext", plaintext, TEST_SIZE);
                hexdump(stdout, "Checktext", checktext, TEST_SIZE);
                ++err;
                }

        /* make sure garble extends forwards only */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(plaintext, ciphertext, sizeof plaintext, &key, iv,
                                        AES_ENCRYPT);

        /* corrupt halfway through */
        ++ciphertext[sizeof ciphertext/2];
        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        memcpy(iv, saved_iv, sizeof iv);
        AES_ige_encrypt(ciphertext, checktext, sizeof checktext, &key, iv,
                                        AES_DECRYPT);

        matches=0;
        for(n=0 ; n < sizeof checktext ; ++n)
                if(checktext[n] == plaintext[n])
                        ++matches;

        if(matches > sizeof checktext/2+sizeof checktext/100)
                {
                printf("More than 51%% matches after garbling\n");
                ++err;
                }

        if(matches < sizeof checktext/2)
                {
                printf("Garble extends backwards!\n");
                ++err;
                }

        /* make sure garble extends both ways */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        AES_set_encrypt_key(rkey2, 8*sizeof rkey2, &key2);
        AES_ige_encrypt(plaintext, ciphertext, sizeof plaintext, &key, iv,
                                        AES_ENCRYPT);

        /* corrupt halfway through */
        ++ciphertext[sizeof ciphertext/2];
        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        AES_set_decrypt_key(rkey2, 8*sizeof rkey2, &key2);
        AES_ige_encrypt(ciphertext, checktext, sizeof checktext, &key, iv,
                                        AES_DECRYPT);

        matches=0;
        for(n=0 ; n < sizeof checktext ; ++n)
                if(checktext[n] == plaintext[n])
                        ++matches;

        if(matches > sizeof checktext/100)
                {
                printf("More than 1%% matches after bidirectional garbling\n");
                ++err;
                }

        /* make sure garble extends both ways (2) */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        AES_set_encrypt_key(rkey2, 8*sizeof rkey2, &key2);
        AES_ige_encrypt(plaintext, ciphertext, sizeof plaintext, &key, iv,
                                        AES_ENCRYPT);

        /* corrupt right at the end */
        ++ciphertext[sizeof ciphertext-1];
        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        AES_set_decrypt_key(rkey2, 8*sizeof rkey2, &key2);
        AES_ige_encrypt(ciphertext, checktext, sizeof checktext, &key, iv,
                                        AES_DECRYPT);

        matches=0;
        for(n=0 ; n < sizeof checktext ; ++n)
                if(checktext[n] == plaintext[n])
                        ++matches;

        if(matches > sizeof checktext/100)
                {
                printf("More than 1%% matches after bidirectional garbling (2)\n");
                ++err;
                }

        /* make sure garble extends both ways (3) */
        AES_set_encrypt_key(rkey, 8*sizeof rkey, &key);
        AES_set_encrypt_key(rkey2, 8*sizeof rkey2, &key2);
        AES_ige_encrypt(plaintext, ciphertext, sizeof plaintext, &key, iv,
                                        AES_ENCRYPT);

        /* corrupt right at the start */
        ++ciphertext[0];
        AES_set_decrypt_key(rkey, 8*sizeof rkey, &key);
        AES_set_decrypt_key(rkey2, 8*sizeof rkey2, &key2);
        AES_ige_encrypt(ciphertext, checktext, sizeof checktext, &key, iv,
                                        AES_DECRYPT);

        matches=0;
        for(n=0 ; n < sizeof checktext ; ++n)
                if(checktext[n] == plaintext[n])
                        ++matches;

        if(matches > sizeof checktext/100)
                {
                printf("More than 1%% matches after bidirectional garbling (3)\n");
                ++err;
                }

        err += run_test_vectors();

        return err;
        }