/*

 * Copyright (C) 2011-2012 Free Software Foundation, Inc.

 *

 * Author: Nikos Mavrogiannopoulos

 *

 * This file is part of GnuTLS.

 *

 * The GnuTLS is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public License

 * as published by the Free Software Foundation; either version 2.1 of

 * the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 *

 */

#include "errors.h"

#include "gnutls_int.h"

#include <gnutls/crypto.h>

#include "errors.h"

#include <aes-x86.h>

#include <nettle/sha.h>

#include <nettle/macros.h>

#include <nettle/nettle-meta.h>

#include <sha-x86.h>

#include <x86-common.h>

void sha1_block_data_order(void *c, const void *p, size_t len);

void sha256_block_data_order(void *c, const void *p, size_t len);

void sha512_block_data_order(void *c, const void *p, size_t len);

typedef void (*update_func) (void *, size_t, const uint8_t *);

typedef void (*digest_func) (void *, size_t, uint8_t *);

typedef void (*set_key_func) (void *, size_t, const uint8_t *);

typedef void (*init_func) (void *);

struct x86_hash_ctx {

	union {

		struct sha1_ctx sha1;

		struct sha224_ctx sha224;

		struct sha256_ctx sha256;

		struct sha384_ctx sha384;

		struct sha512_ctx sha512;

	} ctx;

	void *ctx_ptr;

	gnutls_digest_algorithm_t algo;

	size_t length;

	update_func update;

	digest_func digest;

	init_func init;

};

static int

wrap_x86_hash_update(void *_ctx, const void *text, size_t textsize)

{

	struct x86_hash_ctx *ctx = _ctx;

	ctx->update(ctx->ctx_ptr, textsize, text);

	return GNUTLS_E_SUCCESS;

}

static void wrap_x86_hash_deinit(void *hd)

{

	gnutls_free(hd);

}

void x86_sha1_update(struct sha1_ctx *ctx, size_t length,

		     const uint8_t * data)

{

	struct {

		uint32_t h0, h1, h2, h3, h4;

		uint32_t Nl, Nh;

		uint32_t data[16];

		unsigned int num;

	} octx;

	size_t res;

	unsigned t2, i;

	if ((res = ctx->index)) {

		res = SHA1_DATA_SIZE - res;

		if (length < res)

			res = length;

		sha1_update(ctx, res, data);

		data += res;

		length -= res;

	}

	octx.h0 = ctx->state[0];

	octx.h1 = ctx->state[1];

	octx.h2 = ctx->state[2];

	octx.h3 = ctx->state[3];

	octx.h4 = ctx->state[4];

	memcpy(octx.data, ctx->block, SHA1_DATA_SIZE);

	octx.num = ctx->index;

	res = length % SHA1_DATA_SIZE;

	length -= res;

	if (length > 0) {

		t2 = length / SHA1_DATA_SIZE;

		sha1_block_data_order(&octx, data, t2);

		for (i=0;i

			ctx->count++;

		data += length;

	}

	ctx->state[0] = octx.h0;

	ctx->state[1] = octx.h1;

	ctx->state[2] = octx.h2;

	ctx->state[3] = octx.h3;

	ctx->state[4] = octx.h4;

	memcpy(ctx->block, octx.data, octx.num);

	ctx->index = octx.num;

	if (res > 0) {

		sha1_update(ctx, res, data);

	}

}

void x86_sha256_update(struct sha256_ctx *ctx, size_t length,

		     const uint8_t * data)

{

	struct {

		uint32_t h[8];

		uint32_t Nl, Nh;

		uint32_t data[16];

		unsigned int num;

		unsigned md_len;

	} octx;

	size_t res;

	unsigned t2, i;

	if ((res = ctx->index)) {

		res = SHA256_DATA_SIZE - res;

		if (length < res)

			res = length;

		sha256_update(ctx, res, data);

		data += res;

		length -= res;

	}

	memcpy(octx.h, ctx->state, sizeof(octx.h));

	memcpy(octx.data, ctx->block, SHA256_DATA_SIZE);

	octx.num = ctx->index;

	res = length % SHA256_DATA_SIZE;

	length -= res;

	if (length > 0) {

		t2 = length / SHA1_DATA_SIZE;

		sha256_block_data_order(&octx, data, t2);

		for (i=0;i

			ctx->count++;

		data += length;

	}

	memcpy(ctx->state, octx.h, sizeof(octx.h));

	memcpy(ctx->block, octx.data, octx.num);

	ctx->index = octx.num;

	if (res > 0) {

		sha256_update(ctx, res, data);

	}

}

void x86_sha512_update(struct sha512_ctx *ctx, size_t length,

		     const uint8_t * data)

{

	struct {

		uint64_t h[8];

		uint64_t Nl, Nh;

		union {

			uint64_t d[16];

			uint8_t p[16*8];

		} u;

		unsigned int num;

		unsigned md_len;

	} octx;

	size_t res;

	unsigned t2, i;

	if ((res = ctx->index)) {

		res = SHA512_DATA_SIZE - res;

		if (length < res)

			res = length;

		sha512_update(ctx, res, data);

		data += res;

		length -= res;

	}

	memcpy(octx.h, ctx->state, sizeof(octx.h));

	memcpy(octx.u.p, ctx->block, SHA512_DATA_SIZE);

	octx.num = ctx->index;

	res = length % SHA512_DATA_SIZE;

	length -= res;

	if (length > 0) {

		t2 = length / SHA512_DATA_SIZE;

		sha512_block_data_order(&octx, data, t2);

		for (i=0;i

			MD_INCR(ctx);

		data += length;

	}

	memcpy(ctx->state, octx.h, sizeof(octx.h));

	memcpy(ctx->block, octx.u.p, octx.num);

	ctx->index = octx.num;

	if (res > 0) {

		sha512_update(ctx, res, data);

	}

}

static int _ctx_init(gnutls_digest_algorithm_t algo,

		     struct x86_hash_ctx *ctx)

{

	switch (algo) {

	case GNUTLS_DIG_SHA1:

		sha1_init(&ctx->ctx.sha1);

		ctx->update = (update_func) x86_sha1_update;

		ctx->digest = (digest_func) sha1_digest;

		ctx->init = (init_func) sha1_init;

		ctx->ctx_ptr = &ctx->ctx.sha1;

		ctx->length = SHA1_DIGEST_SIZE;

		break;

	case GNUTLS_DIG_SHA224:

		sha224_init(&ctx->ctx.sha224);

		ctx->update = (update_func) x86_sha256_update;

		ctx->digest = (digest_func) sha224_digest;

		ctx->init = (init_func) sha224_init;

		ctx->ctx_ptr = &ctx->ctx.sha224;

		ctx->length = SHA224_DIGEST_SIZE;

		break;

	case GNUTLS_DIG_SHA256:

		sha256_init(&ctx->ctx.sha256);

		ctx->update = (update_func) x86_sha256_update;

		ctx->digest = (digest_func) sha256_digest;

		ctx->init = (init_func) sha256_init;

		ctx->ctx_ptr = &ctx->ctx.sha256;

		ctx->length = SHA256_DIGEST_SIZE;

		break;

	case GNUTLS_DIG_SHA384:

		sha384_init(&ctx->ctx.sha384);

		ctx->update = (update_func) x86_sha512_update;

		ctx->digest = (digest_func) sha512_digest;

		ctx->init = (init_func) sha384_init;

		ctx->ctx_ptr = &ctx->ctx.sha384;

		ctx->length = SHA384_DIGEST_SIZE;

		break;

	case GNUTLS_DIG_SHA512:

		sha512_init(&ctx->ctx.sha512);

		ctx->update = (update_func) x86_sha512_update;

		ctx->digest = (digest_func) sha512_digest;

		ctx->init = (init_func) sha512_init;

		ctx->ctx_ptr = &ctx->ctx.sha512;

		ctx->length = SHA512_DIGEST_SIZE;

		break;

	default:

		gnutls_assert();

		return GNUTLS_E_INVALID_REQUEST;

	}

	return 0;

}

static int wrap_x86_hash_init(gnutls_digest_algorithm_t algo, void **_ctx)

{

	struct x86_hash_ctx *ctx;

	int ret;

	ctx = gnutls_malloc(sizeof(struct x86_hash_ctx));

	if (ctx == NULL) {

		gnutls_assert();

		return GNUTLS_E_MEMORY_ERROR;

	}

	ctx->algo = algo;

	if ((ret = _ctx_init(algo, ctx)) < 0) {

		gnutls_assert();

		return ret;

	}

	*_ctx = ctx;

	return 0;

}

static void *

wrap_x86_hash_copy(const void *_ctx)

{

	struct x86_hash_ctx *new_ctx;

	const struct x86_hash_ctx *ctx=_ctx;

	ptrdiff_t off = (uint8_t *)ctx->ctx_ptr - (uint8_t *)(&ctx->ctx);

	new_ctx = gnutls_malloc(sizeof(struct x86_hash_ctx));

	if (new_ctx == NULL) {

		gnutls_assert();

		return NULL;

	}

	memcpy(new_ctx, ctx, sizeof(*new_ctx));

	new_ctx->ctx_ptr = (uint8_t *)&new_ctx->ctx + off;

	return new_ctx;

}

static int

wrap_x86_hash_output(void *src_ctx, void *digest, size_t digestsize)

{

	struct x86_hash_ctx *ctx;

	ctx = src_ctx;

	if (digestsize < ctx->length)

		return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);

	ctx->digest(ctx->ctx_ptr, digestsize, digest);

	return 0;

}

static int wrap_x86_hash_fast(gnutls_digest_algorithm_t algo,

				 const void *text, size_t text_size,

				 void *digest)

{

	struct x86_hash_ctx ctx;

	int ret;

	ret = _ctx_init(algo, &ctx;;

	if (ret < 0)

		return gnutls_assert_val(ret);

	ctx.update(&ctx, text_size, text);

	ctx.digest(&ctx, ctx.length, digest);

	return 0;

}

const struct nettle_hash x86_sha1 =

NN_HASH(sha1, x86_sha1_update, sha1_digest, SHA1);

const struct nettle_hash x86_sha224 =

NN_HASH(sha224, x86_sha256_update, sha224_digest, SHA224);

const struct nettle_hash x86_sha256 =

NN_HASH(sha256, x86_sha256_update, sha256_digest, SHA256);

const struct nettle_hash x86_sha384 =

NN_HASH(sha384, x86_sha512_update, sha384_digest, SHA384);

const struct nettle_hash x86_sha512 =

NN_HASH(sha512, x86_sha512_update, sha512_digest, SHA512);

const gnutls_crypto_digest_st _gnutls_sha_x86_ssse3 = {

	.init = wrap_x86_hash_init,

	.hash = wrap_x86_hash_update,

	.output = wrap_x86_hash_output,

	.copy = wrap_x86_hash_copy,

	.deinit = wrap_x86_hash_deinit,

	.fast = wrap_x86_hash_fast,

};