/* 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 #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_CTX_copy sets |out| to be a duplicate of the current state |in|. It // returns one on success and zero on error. OPENSSL_EXPORT int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in); // 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++" { BSSL_NAMESPACE_BEGIN BORINGSSL_MAKE_DELETER(CMAC_CTX, CMAC_CTX_free) BSSL_NAMESPACE_END } // extern C++ #endif #endif // OPENSSL_HEADER_CMAC_H