/* Copyright (C) 1995-1998 Eric Young ([email protected]) * All rights reserved. * * This package is an SSL implementation written * by Eric Young ([email protected]). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson ([email protected]). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * 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 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young ([email protected])" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson ([email protected])" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 OR CONTRIBUTORS 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. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #ifndef OPENSSL_HEADER_HMAC_H #define OPENSSL_HEADER_HMAC_H #include <openssl/base.h> #include <openssl/digest.h> #if defined(__cplusplus) extern "C" { #endif // HMAC contains functions for constructing PRFs from Merkle–Damgård hash // functions using HMAC. // One-shot operation. // HMAC calculates the HMAC of |data_len| bytes of |data|, using the given key // and hash function, and writes the result to |out|. On entry, |out| must // contain at least |EVP_MD_size| bytes of space. The actual length of the // result is written to |*out_len|. An output size of |EVP_MAX_MD_SIZE| will // always be large enough. It returns |out| or NULL on error. OPENSSL_EXPORT uint8_t *HMAC(const EVP_MD *evp_md, const void *key, size_t key_len, const uint8_t *data, size_t data_len, uint8_t *out, unsigned int *out_len); // Incremental operation. // HMAC_CTX_init initialises |ctx| for use in an HMAC operation. It's assumed // that HMAC_CTX objects will be allocated on the stack thus no allocation // function is provided. OPENSSL_EXPORT void HMAC_CTX_init(HMAC_CTX *ctx); // HMAC_CTX_new allocates and initialises a new |HMAC_CTX| and returns it, or // NULL on allocation failure. The caller must use |HMAC_CTX_free| to release // the resulting object. OPENSSL_EXPORT HMAC_CTX *HMAC_CTX_new(void); // HMAC_CTX_cleanup frees data owned by |ctx|. It does not free |ctx| itself. OPENSSL_EXPORT void HMAC_CTX_cleanup(HMAC_CTX *ctx); // HMAC_CTX_cleanse zeros the digest state from |ctx| and then performs the // actions of |HMAC_CTX_cleanup|. OPENSSL_EXPORT void HMAC_CTX_cleanse(HMAC_CTX *ctx); // HMAC_CTX_free calls |HMAC_CTX_cleanup| and then frees |ctx| itself. OPENSSL_EXPORT void HMAC_CTX_free(HMAC_CTX *ctx); // HMAC_Init_ex sets up an initialised |HMAC_CTX| to use |md| as the hash // function and |key| as the key. For a non-initial call, |md| may be NULL, in // which case the previous hash function will be used. If the hash function has // not changed and |key| is NULL, |ctx| reuses the previous key. It returns one // on success or zero on allocation failure. // // WARNING: NULL and empty keys are ambiguous on non-initial calls. Passing NULL // |key| but repeating the previous |md| reuses the previous key rather than the // empty key. OPENSSL_EXPORT int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, size_t key_len, const EVP_MD *md, ENGINE *impl); // HMAC_Update hashes |data_len| bytes from |data| into the current HMAC // operation in |ctx|. It returns one. OPENSSL_EXPORT int HMAC_Update(HMAC_CTX *ctx, const uint8_t *data, size_t data_len); // HMAC_Final completes the HMAC operation in |ctx| and writes the result to // |out| and the sets |*out_len| to the length of the result. On entry, |out| // must contain at least |HMAC_size| bytes of space. An output size of // |EVP_MAX_MD_SIZE| will always be large enough. It returns one on success or // zero on allocation failure. OPENSSL_EXPORT int HMAC_Final(HMAC_CTX *ctx, uint8_t *out, unsigned int *out_len); // Utility functions. // HMAC_size returns the size, in bytes, of the HMAC that will be produced by // |ctx|. On entry, |ctx| must have been setup with |HMAC_Init_ex|. OPENSSL_EXPORT size_t HMAC_size(const HMAC_CTX *ctx); // HMAC_CTX_get_md returns |ctx|'s hash function. OPENSSL_EXPORT const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx); // HMAC_CTX_copy_ex sets |dest| equal to |src|. On entry, |dest| must have been // initialised by calling |HMAC_CTX_init|. It returns one on success and zero // on error. OPENSSL_EXPORT int HMAC_CTX_copy_ex(HMAC_CTX *dest, const HMAC_CTX *src); // HMAC_CTX_reset calls |HMAC_CTX_cleanup| followed by |HMAC_CTX_init|. OPENSSL_EXPORT void HMAC_CTX_reset(HMAC_CTX *ctx); // Deprecated functions. OPENSSL_EXPORT int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len, const EVP_MD *md); // HMAC_CTX_copy calls |HMAC_CTX_init| on |dest| and then sets it equal to // |src|. On entry, |dest| must /not/ be initialised for an operation with // |HMAC_Init_ex|. It returns one on success and zero on error. OPENSSL_EXPORT int HMAC_CTX_copy(HMAC_CTX *dest, const HMAC_CTX *src); // Private functions struct hmac_ctx_st { … } /* HMAC_CTX */; #if defined(__cplusplus) } // extern C #if !defined(BORINGSSL_NO_CXX) extern "C++" { BSSL_NAMESPACE_BEGIN BORINGSSL_MAKE_DELETER(…) ScopedHMAC_CTX; BSSL_NAMESPACE_END } // extern C++ #endif #endif #endif // OPENSSL_HEADER_HMAC_H
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