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#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <aes_cbc.h>
#include "types.h"
#include "ossl_helper.h"
#include "cbc_std_vectors.h"

//define CBC_VECTORS_VERBOSE
//define CBC_VECTORS_EXTRA_VERBOSE

#ifndef TEST_SEED
# define TEST_SEED 0x1234
#endif
#ifndef RANDOMS
# define RANDOMS  100
#endif
#ifndef TEST_LEN
# define TEST_LEN  (8*1024*1024)
#endif
#ifndef PAGE_LEN
# define PAGE_LEN  (4*1024)
#endif
#ifndef MAX_UNALINED
# define MAX_UNALINED  (16)
#endif

static cbc_key_size const Ksize[] = { CBC_128_BITS, CBC_192_BITS, CBC_256_BITS };

typedef void (*aes_cbc_generic)(uint8_t * in,
				uint8_t * IV,
				uint8_t * keys, uint8_t * out, uint64_t len_bytes);

int OpenSslEnc(uint8_t k_len,
	       uint8_t * key, uint8_t * in, uint8_t * iv, uint8_t * out, uint64_t len_bytes)
{
	if (CBC_128_BITS == k_len) {
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" OpenSSL128 ");
#endif
		openssl_aes_128_cbc_enc(key, (uint8_t *) iv, len_bytes, in, out);
	} else if (CBC_192_BITS == k_len) {
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" OpenSSL192 ");
#endif
		openssl_aes_192_cbc_enc(key, (uint8_t *) iv, len_bytes, in, out);
	} else if (CBC_256_BITS == k_len) {
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" OpenSSL256 ");
		fflush(0);
#endif
		openssl_aes_256_cbc_enc(key, (uint8_t *) iv, len_bytes, in, out);
	} else {
		fprintf(stderr, "Invalid key length: %d\n", k_len);
		return 1;
	}
	return 0;
}

int OpenSslDec(uint8_t k_len,
	       uint8_t * key, uint8_t * in, uint8_t * iv, uint8_t * out, uint64_t len_bytes)
{
	if (CBC_128_BITS == k_len) {
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" OpenSSL128 ");
#endif
		openssl_aes_128_cbc_dec(key, (uint8_t *) iv, len_bytes, in, out);
	} else if (CBC_192_BITS == k_len) {
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" OpenSSL192 ");
#endif
		openssl_aes_192_cbc_dec(key, (uint8_t *) iv, len_bytes, in, out);
	} else if (CBC_256_BITS == k_len) {
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" OpenSSL256 ");
#endif
		openssl_aes_256_cbc_dec(key, (uint8_t *) iv, len_bytes, in, out);
	} else {
		fprintf(stderr, "Invalid key length: %d\n", k_len);
		return 1;
	}
	return 0;
}

void mk_rand_data(uint8_t * data, uint32_t size)
{
	int i;
	for (i = 0; i < size; i++) {
		*data++ = rand();
	}
}

int check_data(uint8_t * test, uint8_t * expected, uint64_t len, char *data_name)
{
	int mismatch;
	int OK = 0;
	uint64_t a;

	mismatch = memcmp(test, expected, len);
	if (!mismatch) {
		return OK;

	} else {
		OK = 1;
		printf("  failed %s \t\t", data_name);
		for (a = 0; a < len; a++) {
			if (test[a] != expected[a]) {
				printf(" '%x' != '%x' at %lx of %lx\n",
				       test[a], expected[a], a, len);
				break;
			}
		}
	}
	return OK;
}

int check_vector(struct cbc_vector *vector)
{
	uint8_t *pt_test = NULL;
	uint8_t *o_ct_test = NULL;
	int OK = 0;
	aes_cbc_generic enc;
	aes_cbc_generic dec;

#ifdef CBC_VECTORS_VERBOSE
	printf(" Keylen:%d PLen:%d ", (int)vector->K_LEN, (int)vector->P_LEN);
#ifdef CBC_VECTORS_EXTRA_VERBOSE
	printf(" K:%p P:%p C:%p IV:%p expC:%p Keys:%p ", vector->K, vector->P, vector->C,
	       vector->IV, vector->EXP_C, vector->KEYS);
#endif
	fflush(0);
#else
	printf(".");
#endif

	if (CBC_128_BITS == vector->K_LEN) {
		enc = (aes_cbc_generic) & aes_cbc_enc_128;
		dec = (aes_cbc_generic) & aes_cbc_dec_128;
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" CBC128 ");
#endif
	} else if (CBC_192_BITS == vector->K_LEN) {
		enc = (aes_cbc_generic) & aes_cbc_enc_192;
		dec = (aes_cbc_generic) & aes_cbc_dec_192;
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" CBC192 ");
#endif
	} else if (CBC_256_BITS == vector->K_LEN) {
		enc = (aes_cbc_generic) & aes_cbc_enc_256;
		dec = (aes_cbc_generic) & aes_cbc_dec_256;
#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" CBC256 ");
#endif
	} else {
		printf("Invalid key length: %d\n", vector->K_LEN);
		return 1;
	}

	// Allocate space for the calculated ciphertext
	pt_test = malloc(vector->P_LEN);
	o_ct_test = malloc(vector->P_LEN);
	if ((pt_test == NULL) || (o_ct_test == NULL)) {
		fprintf(stderr, "Can't allocate ciphertext memory\n");
		return 1;
	}

	aes_cbc_precomp(vector->K, vector->K_LEN, vector->KEYS);

#ifdef CBC_VECTORS_VERBOSE
	fflush(0);
#endif
	////
	// ISA-l Encrypt
	////
	enc(vector->P, vector->IV, vector->KEYS->enc_keys, vector->C, vector->P_LEN);
	if (NULL != vector->EXP_C) {	//when the encrypted text is know verify correct
		OK |=
		    check_data(vector->EXP_C, vector->C, vector->P_LEN,
			       "ISA-L expected cypher text (C)");
	}
	OpenSslEnc(vector->K_LEN, vector->K, vector->P, vector->IV, o_ct_test, vector->P_LEN);
	OK |=
	    check_data(vector->C, o_ct_test, vector->P_LEN,
		       "OpenSSL vs ISA-L cypher text (C)");

	memcpy(pt_test, vector->P, vector->P_LEN);
	memset(vector->P, 0, vector->P_LEN);
#ifdef CBC_VECTORS_VERBOSE
	fflush(0);
#endif

	////
	// ISA-l Decrypt
	////
	dec(vector->C, vector->IV, vector->KEYS->dec_keys, vector->P, vector->P_LEN);
	OK |= check_data(vector->P, pt_test, vector->P_LEN, "ISA-L decrypted plain text (P)");
	memset(vector->P, 0, vector->P_LEN);
	dec(o_ct_test, vector->IV, vector->KEYS->dec_keys, vector->P, vector->P_LEN);
	OK |= check_data(vector->P, pt_test, vector->P_LEN, "ISA-L decrypted OpenSSL (P)");
	memset(vector->P, 0, vector->P_LEN);
	OpenSslDec(vector->K_LEN, vector->K, vector->C, vector->IV, vector->P, vector->P_LEN);
	OK |= check_data(vector->P, pt_test, vector->P_LEN, "OpenSSL decrypted ISA-L (P)");
#ifdef CBC_VECTORS_VERBOSE
	if (OK)
		printf("Failed");
	else
		printf("Passed");

	printf("\n");
#endif

	return OK;
}

int test_std_combinations(void)
{
	int const vectors_cnt = sizeof(cbc_vectors) / sizeof(cbc_vectors[0]);
	int i, ret;
	uint8_t *iv = NULL;

	printf("AES CBC standard test vectors:");
#ifdef CBC_VECTORS_VERBOSE
	printf("\n");
#endif
	ret = posix_memalign((void **)&iv, 16, (CBC_IV_DATA_LEN));
	if ((0 != ret) || (NULL == iv))
		return 1;

	for (i = 0; (i < vectors_cnt); i++) {
		struct cbc_vector vect = cbc_vectors[i];

		ret = posix_memalign((void **)&vect.KEYS, 16, (sizeof(*vect.KEYS)));
		if ((0 != ret) || (NULL == vect.KEYS))
			return 1;
		// IV data must be aligned to 16 byte boundary so move data in aligned buffer and change out the pointer
		memcpy(iv, vect.IV, CBC_IV_DATA_LEN);
		vect.IV = iv;
		vect.C = NULL;
		vect.C = malloc(vect.P_LEN);
		if ((NULL == vect.C))
			return 1;
#ifdef CBC_VECTORS_VERBOSE
		printf("vector[%d of %d] ", i, vectors_cnt);
#endif
		if (0 == (i % 25))
			printf("\n");
		if (0 == (i % 10))
			fflush(0);

		if (0 != check_vector(&vect))
			return 1;

		aligned_free(vect.KEYS);
		free(vect.C);
	}

	aligned_free(iv);
	printf("\n");
	return 0;
}

int test_random_combinations(void)
{
	struct cbc_vector test;
	int t, ret;

	printf("AES CBC random test vectors:");
#ifdef CBC_VECTORS_VERBOSE
	fflush(0);
#endif
	test.IV = NULL;
	ret = posix_memalign((void **)&test.IV, 16, (CBC_IV_DATA_LEN));
	if ((0 != ret) || (NULL == test.IV))
		return 1;
	test.KEYS = NULL;
	ret = posix_memalign((void **)&test.KEYS, 16, (sizeof(*test.KEYS)));
	if ((0 != ret) || (NULL == test.KEYS))
		return 1;

	for (t = 0; RANDOMS > t; t++) {
		int Plen = 16 + ((rand() % TEST_LEN) & ~0xf);	//must be a 16byte multiple
		int offset = (rand() % MAX_UNALINED);
		int Kindex = (rand() % (sizeof(Ksize) / sizeof(Ksize[0])));	// select one of the valid key sizes

		if (0 == (t % 25))
			printf("\n");
		if (0 == (t % 10))
			fflush(0);

		test.C = NULL;
		test.P = NULL;
		test.K = NULL;
		test.EXP_C = NULL;
		test.P_LEN = Plen;
		test.K_LEN = Ksize[Kindex];

		test.P = malloc(test.P_LEN + offset);
		test.C = malloc(test.P_LEN + offset);
		test.K = malloc(test.K_LEN + offset);
		if ((NULL == test.P) || (NULL == test.C) || (NULL == test.K)) {
			printf("malloc of testsize:0x%x failed\n", Plen);
			return -1;
		}
		test.P += offset;
		test.C += offset;
		test.K += offset;

		mk_rand_data(test.P, test.P_LEN);
		mk_rand_data(test.K, test.K_LEN);
		mk_rand_data(test.IV, CBC_IV_DATA_LEN);

#ifdef CBC_VECTORS_EXTRA_VERBOSE
		printf(" Offset:0x%x ", offset);
#endif
		if (0 != check_vector(&test))
			return 1;

		test.C -= offset;
		free(test.C);
		test.K -= offset;
		free(test.K);
		test.P -= offset;
		free(test.P);
	}

	aligned_free(test.IV);
	aligned_free(test.KEYS);
	printf("\n");
	return 0;
}

int test_efence_combinations(void)
{
	struct cbc_vector test;
	int offset = 0;
	int key_idx;
	uint8_t *P = NULL, *C = NULL, *K = NULL, *IV = NULL;
	uint8_t *key_data = NULL;

	P = malloc(PAGE_LEN);
	C = malloc(PAGE_LEN);
	K = malloc(PAGE_LEN);
	IV = malloc(PAGE_LEN);
	key_data = malloc(PAGE_LEN);

	if ((NULL == P) || (NULL == C) || (NULL == K) || (NULL == IV)
	    || (NULL == key_data)
	    ) {
		printf("malloc of testsize:0x%x failed\n", PAGE_LEN);
		return -1;
	}
	// place buffers to end at page boundary
	test.P_LEN = PAGE_LEN / 2;
	test.EXP_C = NULL;

	printf("AES CBC efence test vectors:");
	for (key_idx = 0; key_idx < (sizeof(Ksize) / sizeof(Ksize[0])); key_idx++) {
		test.K_LEN = Ksize[key_idx];

		for (offset = 0; MAX_UNALINED > offset; offset++) {
			if (0 == (offset % 80))
				printf("\n");
			// move the start and size of the data block towards the end of the page
			test.P_LEN = ((PAGE_LEN / (1 + (2 * offset))) & ~0xff);	// must be a multiple of 16
			if (16 > test.P_LEN)
				test.P_LEN = 16;
			//Place data at end of page
			test.P = P + PAGE_LEN - test.P_LEN - offset;
			test.C = C + PAGE_LEN - test.P_LEN - offset;
			test.K = K + PAGE_LEN - test.K_LEN - offset;
			test.IV = IV + PAGE_LEN - CBC_IV_DATA_LEN - offset;
			test.IV = test.IV - ((uint64_t) test.IV & 0xff);	// align to 16 byte boundary
			test.KEYS = (struct cbc_key_data *)
			    (key_data + PAGE_LEN - sizeof(*test.KEYS) - offset);
			test.KEYS = (struct cbc_key_data *)
			    ((uint8_t *) test.KEYS - ((uint64_t) test.KEYS & 0xff));	// align to 16 byte boundary

			mk_rand_data(test.P, test.P_LEN);
			mk_rand_data(test.K, test.K_LEN);
			mk_rand_data(test.IV, CBC_IV_DATA_LEN);
#ifdef CBC_VECTORS_EXTRA_VERBOSE
			printf(" Offset:0x%x ", offset);
#endif
			if (0 != check_vector(&test))
				return 1;
		}

	}

	free(P);
	free(C);
	free(K);
	free(IV);
	free(key_data);
	printf("\n");
	return 0;
}

int main(void)
{
	uint32_t OK = 0;

	srand(TEST_SEED);
	OK |= test_std_combinations();
	OK |= test_random_combinations();
	OK |= test_efence_combinations();
	if (0 == OK) {
		printf("...Pass\n");
	} else {
		printf("...Fail\n");
	}
	return OK;
}