/* Copyright (c) 2015, Google Inc.
|
*
|
* Permission to use, copy, modify, and/or distribute this software for any
|
* purpose with or without fee is hereby granted, provided that the above
|
* copyright notice and this permission notice appear in all copies.
|
*
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
|
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
|
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
|
|
#ifndef OPENSSL_HEADER_CMAC_H
|
#define OPENSSL_HEADER_CMAC_H
|
|
#include <openssl/base.h>
|
|
#if defined(__cplusplus)
|
extern "C" {
|
#endif
|
|
|
// CMAC.
|
//
|
// CMAC is a MAC based on AES-CBC and defined in
|
// https://tools.ietf.org/html/rfc4493#section-2.3.
|
|
|
// One-shot functions.
|
|
// AES_CMAC calculates the 16-byte, CMAC authenticator of |in_len| bytes of
|
// |in| and writes it to |out|. The |key_len| may be 16 or 32 bytes to select
|
// between AES-128 and AES-256. It returns one on success or zero on error.
|
OPENSSL_EXPORT int AES_CMAC(uint8_t out[16], const uint8_t *key, size_t key_len,
|
const uint8_t *in, size_t in_len);
|
|
|
// Incremental interface.
|
|
// CMAC_CTX_new allocates a fresh |CMAC_CTX| and returns it, or NULL on
|
// error.
|
OPENSSL_EXPORT CMAC_CTX *CMAC_CTX_new(void);
|
|
// CMAC_CTX_free frees a |CMAC_CTX|.
|
OPENSSL_EXPORT void CMAC_CTX_free(CMAC_CTX *ctx);
|
|
// CMAC_Init configures |ctx| to use the given |key| and |cipher|. The CMAC RFC
|
// only specifies the use of AES-128 thus |key_len| should be 16 and |cipher|
|
// should be |EVP_aes_128_cbc()|. However, this implementation also supports
|
// AES-256 by setting |key_len| to 32 and |cipher| to |EVP_aes_256_cbc()|. The
|
// |engine| argument is ignored.
|
//
|
// It returns one on success or zero on error.
|
OPENSSL_EXPORT int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t key_len,
|
const EVP_CIPHER *cipher, ENGINE *engine);
|
|
|
// CMAC_Reset resets |ctx| so that a fresh message can be authenticated.
|
OPENSSL_EXPORT int CMAC_Reset(CMAC_CTX *ctx);
|
|
// CMAC_Update processes |in_len| bytes of message from |in|. It returns one on
|
// success or zero on error.
|
OPENSSL_EXPORT int CMAC_Update(CMAC_CTX *ctx, const uint8_t *in, size_t in_len);
|
|
// CMAC_Final sets |*out_len| to 16 and, if |out| is not NULL, writes 16 bytes
|
// of authenticator to it. It returns one on success or zero on error.
|
OPENSSL_EXPORT int CMAC_Final(CMAC_CTX *ctx, uint8_t *out, size_t *out_len);
|
|
|
#if defined(__cplusplus)
|
} // extern C
|
|
extern "C++" {
|
|
namespace bssl {
|
|
BORINGSSL_MAKE_DELETER(CMAC_CTX, CMAC_CTX_free)
|
|
} // namespace bssl
|
|
} // extern C++
|
|
#endif
|
|
#endif // OPENSSL_HEADER_CMAC_H
|
