/* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#ifndef OPENSSL_HEADER_HKDF_H
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#define OPENSSL_HEADER_HKDF_H
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#include <openssl/base.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// HKDF.
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// HKDF computes HKDF (as specified by RFC 5869) of initial keying material
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// |secret| with |salt| and |info| using |digest|, and outputs |out_len| bytes
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// to |out_key|. It returns one on success and zero on error.
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//
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// HKDF is an Extract-and-Expand algorithm. It does not do any key stretching,
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// and as such, is not suited to be used alone to generate a key from a
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// password.
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OPENSSL_EXPORT int HKDF(uint8_t *out_key, size_t out_len, const EVP_MD *digest,
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const uint8_t *secret, size_t secret_len,
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const uint8_t *salt, size_t salt_len,
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const uint8_t *info, size_t info_len);
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// HKDF_extract computes a HKDF PRK (as specified by RFC 5869) from initial
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// keying material |secret| and salt |salt| using |digest|, and outputs
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// |out_len| bytes to |out_key|. The maximum output size is |EVP_MAX_MD_SIZE|.
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// It returns one on success and zero on error.
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OPENSSL_EXPORT int HKDF_extract(uint8_t *out_key, size_t *out_len,
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const EVP_MD *digest, const uint8_t *secret,
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size_t secret_len, const uint8_t *salt,
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size_t salt_len);
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// HKDF_expand computes a HKDF OKM (as specified by RFC 5869) of length
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// |out_len| from the PRK |prk| and info |info| using |digest|, and outputs
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// the result to |out_key|. It returns one on success and zero on error.
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OPENSSL_EXPORT int HKDF_expand(uint8_t *out_key, size_t out_len,
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const EVP_MD *digest, const uint8_t *prk,
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size_t prk_len, const uint8_t *info,
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size_t info_len);
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#if defined(__cplusplus)
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} // extern C
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#endif
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#define HKDF_R_OUTPUT_TOO_LARGE 100
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#endif // OPENSSL_HEADER_HKDF_H
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