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+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * 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 (tjh@cryptsoft.com).
+ *
+ * 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 (eay@cryptsoft.com)"
+ * 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 (tjh@cryptsoft.com)"
+ *
+ * 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_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 otherwise.
+//
+// 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 error.
+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_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 {
+ const EVP_MD *md;
+ EVP_MD_CTX md_ctx;
+ EVP_MD_CTX i_ctx;
+ EVP_MD_CTX o_ctx;
+} /* HMAC_CTX */;
+
+
+#if defined(__cplusplus)
+} // extern C
+
+#if !defined(BORINGSSL_NO_CXX)
+extern "C++" {
+
+namespace bssl {
+
+BORINGSSL_MAKE_DELETER(HMAC_CTX, HMAC_CTX_free)
+
+using ScopedHMAC_CTX =
+ internal::StackAllocated<HMAC_CTX, void, HMAC_CTX_init, HMAC_CTX_cleanup>;
+
+} // namespace bssl
+
+} // extern C++
+#endif
+
+#endif
+
+#endif // OPENSSL_HEADER_HMAC_H
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