| /* Copyright 2015 The BoringSSL Authors |
| * |
| * 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_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 |