/*-

* Copyright (c) 2014 Michihiro NAKAJIMA

* 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 the

*    documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR

* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,

* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include "archive_platform.h"

#ifdef HAVE_STRING_H

#include <string.h>

#endif

#include "archive.h"

#include "archive_hmac_private.h"

/*

 * On systems that do not support any recognized crypto libraries,

 * the archive_hmac.c file is expected to define no usable symbols.

 *

 * But some compilers and linkers choke on empty object files, so

 * define a public symbol that will always exist.  This could

 * be removed someday if this file gains another always-present

 * symbol definition.

 */

int __libarchive_hmac_build_hack(void) {

	return 0;

}

#ifdef ARCHIVE_HMAC_USE_Apple_CommonCrypto

static int

__hmac_sha1_init(archive_hmac_sha1_ctx *ctx, const uint8_t *key, size_t key_len)

{

	CCHmacInit(ctx, kCCHmacAlgSHA1, key, key_len);

	return 0;

}

static void

__hmac_sha1_update(archive_hmac_sha1_ctx *ctx, const uint8_t *data,

    size_t data_len)

{

	CCHmacUpdate(ctx, data, data_len);

}

static void

__hmac_sha1_final(archive_hmac_sha1_ctx *ctx, uint8_t *out, size_t *out_len)

{

	CCHmacFinal(ctx, out);

	*out_len = 20;

}

static void

__hmac_sha1_cleanup(archive_hmac_sha1_ctx *ctx)

{

	memset(ctx, 0, sizeof(*ctx));

}

#elif defined(_WIN32) && !defined(__CYGWIN__) && defined(HAVE_BCRYPT_H)

#ifndef BCRYPT_HASH_REUSABLE_FLAG

# define BCRYPT_HASH_REUSABLE_FLAG 0x00000020

#endif

static int

__hmac_sha1_init(archive_hmac_sha1_ctx *ctx, const uint8_t *key, size_t key_len)

{

	BCRYPT_ALG_HANDLE hAlg;

	BCRYPT_HASH_HANDLE hHash;

	DWORD hash_len;

	PBYTE hash;

	ULONG result;

	NTSTATUS status;

	ctx->hAlg = NULL;

	status = BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_SHA1_ALGORITHM,

		MS_PRIMITIVE_PROVIDER, BCRYPT_ALG_HANDLE_HMAC_FLAG);

	if (!BCRYPT_SUCCESS(status))

		return -1;

	status = BCryptGetProperty(hAlg, BCRYPT_HASH_LENGTH, (PUCHAR)&hash_len,

		sizeof(hash_len), &result, 0);

	if (!BCRYPT_SUCCESS(status)) {

		BCryptCloseAlgorithmProvider(hAlg, 0);

		return -1;

	}

	hash = (PBYTE)HeapAlloc(GetProcessHeap(), 0, hash_len);

	if (hash == NULL) {

		BCryptCloseAlgorithmProvider(hAlg, 0);

		return -1;

	}

	status = BCryptCreateHash(hAlg, &hHash, NULL, 0,

		(PUCHAR)key, (ULONG)key_len, BCRYPT_HASH_REUSABLE_FLAG);

	if (!BCRYPT_SUCCESS(status)) {

		BCryptCloseAlgorithmProvider(hAlg, 0);

		HeapFree(GetProcessHeap(), 0, hash);

		return -1;

	}

	ctx->hAlg = hAlg;

	ctx->hHash = hHash;

	ctx->hash_len = hash_len;

	ctx->hash = hash;

	return 0;

}

static void

__hmac_sha1_update(archive_hmac_sha1_ctx *ctx, const uint8_t *data,

	size_t data_len)

{

	BCryptHashData(ctx->hHash, (PUCHAR)(uintptr_t)data, (ULONG)data_len, 0);

}

static void

__hmac_sha1_final(archive_hmac_sha1_ctx *ctx, uint8_t *out, size_t *out_len)

{

	BCryptFinishHash(ctx->hHash, ctx->hash, ctx->hash_len, 0);

	if (ctx->hash_len == *out_len)

		memcpy(out, ctx->hash, *out_len);

}

static void

__hmac_sha1_cleanup(archive_hmac_sha1_ctx *ctx)

{

	if (ctx->hAlg != NULL) {

		BCryptCloseAlgorithmProvider(ctx->hAlg, 0);

		HeapFree(GetProcessHeap(), 0, ctx->hash);

		ctx->hAlg = NULL;

	}

}

#elif defined(HAVE_LIBNETTLE) && defined(HAVE_NETTLE_HMAC_H)

static int

__hmac_sha1_init(archive_hmac_sha1_ctx *ctx, const uint8_t *key, size_t key_len)

{

	hmac_sha1_set_key(ctx, key_len, key);

	return 0;

}

static void

__hmac_sha1_update(archive_hmac_sha1_ctx *ctx, const uint8_t *data,

    size_t data_len)

{

	hmac_sha1_update(ctx, data_len, data);

}

static void

__hmac_sha1_final(archive_hmac_sha1_ctx *ctx, uint8_t *out, size_t *out_len)

{

	hmac_sha1_digest(ctx, (unsigned)*out_len, out);

}

static void

__hmac_sha1_cleanup(archive_hmac_sha1_ctx *ctx)

{

	memset(ctx, 0, sizeof(*ctx));

}

#elif defined(HAVE_LIBCRYPTO)

static int

__hmac_sha1_init(archive_hmac_sha1_ctx *ctx, const uint8_t *key, size_t key_len)

{

	*ctx = HMAC_CTX_new();

	if (*ctx == NULL)

		return -1;

	HMAC_Init_ex(*ctx, key, key_len, EVP_sha1(), NULL);

	return 0;

}

static void

__hmac_sha1_update(archive_hmac_sha1_ctx *ctx, const uint8_t *data,

    size_t data_len)

{

	HMAC_Update(*ctx, data, data_len);

}

static void

__hmac_sha1_final(archive_hmac_sha1_ctx *ctx, uint8_t *out, size_t *out_len)

{

	unsigned int len = (unsigned int)*out_len;

	HMAC_Final(*ctx, out, &len;;

	*out_len = len;

}

static void

__hmac_sha1_cleanup(archive_hmac_sha1_ctx *ctx)

{

	HMAC_CTX_free(*ctx);

	*ctx = NULL;

}

#else

/* Stub */

static int

__hmac_sha1_init(archive_hmac_sha1_ctx *ctx, const uint8_t *key, size_t key_len)

{

	(void)ctx;/* UNUSED */

	(void)key;/* UNUSED */

	(void)key_len;/* UNUSED */

	return -1;

}

static void

__hmac_sha1_update(archive_hmac_sha1_ctx *ctx, const uint8_t *data,

    size_t data_len)

{

	(void)ctx;/* UNUSED */

	(void)data;/* UNUSED */

	(void)data_len;/* UNUSED */

}

static void

__hmac_sha1_final(archive_hmac_sha1_ctx *ctx, uint8_t *out, size_t *out_len)

{

	(void)ctx;/* UNUSED */

	(void)out;/* UNUSED */

	(void)out_len;/* UNUSED */

}

static void

__hmac_sha1_cleanup(archive_hmac_sha1_ctx *ctx)

{

	(void)ctx;/* UNUSED */

}

#endif

const struct archive_hmac __archive_hmac = {

	&__hmac_sha1_init,

	&__hmac_sha1_update,

	&__hmac_sha1_final,

	&__hmac_sha1_cleanup,

};