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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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