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/* Copyright (c) 2014, 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_HKDF_H
#define OPENSSL_HEADER_HKDF_H
#include <openssl/base.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Computes HKDF (as specified by RFC 5869) of initial keying material |secret|
* with |salt| and |info| using |digest|, and outputs |out_len| bytes to
* |out_key|. It returns one on success and zero on error.
*
* HKDF is an Extract-and-Expand algorithm. It does not do any key stretching,
* and as such, is not suited to be used alone to generate a key from a
* password. */
OPENSSL_EXPORT int HKDF(uint8_t *out_key, size_t out_len, const EVP_MD *digest,
const uint8_t *secret, size_t secret_len,
const uint8_t *salt, size_t salt_len,
const uint8_t *info, size_t info_len);
#if defined(__cplusplus)
} /* extern C */
#endif
#define HKDF_R_OUTPUT_TOO_LARGE 100
#endif /* OPENSSL_HEADER_HKDF_H */
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