Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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68 lines
2.8 KiB
68 lines
2.8 KiB
/* 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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// |
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// WARNING: This function orders the inputs differently from RFC 5869 |
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// specification. Double-check which parameter is the secret/IKM and which is |
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// the salt when using. |
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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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