| /* 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 */ |
