/* 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>
|
|
#if defined(__cplusplus)
|
extern "C" {
|
#endif
|
|
// HKDF.
|
|
// HKDF 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);
|
|
// HKDF_extract computes a HKDF PRK (as specified by RFC 5869) from initial
|
// keying material |secret| and salt |salt| using |digest|, and outputs
|
// |out_len| bytes to |out_key|. The maximum output size is |EVP_MAX_MD_SIZE|.
|
// It returns one on success and zero on error.
|
OPENSSL_EXPORT int HKDF_extract(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);
|
|
// HKDF_expand computes a HKDF OKM (as specified by RFC 5869) of length
|
// |out_len| from the PRK |prk| and info |info| using |digest|, and outputs
|
// the result to |out_key|. It returns one on success and zero on error.
|
OPENSSL_EXPORT int HKDF_expand(uint8_t* out_key, size_t out_len, const EVP_MD* digest, const uint8_t* prk,
|
size_t prk_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
|
