d2b5af56cf
This reverts commits:8d79ed674019fdcb52348d79ed6740Because WebRTC (at least) includes our headers in an extern "C" block, which precludes having any C++ in them. Change-Id: Ia849f43795a40034cbd45b22ea680b51aab28b2d
148 lines
6.4 KiB
C
148 lines
6.4 KiB
C
/* Copyright (c) 2016, 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_NEWHOPE_H
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#define OPENSSL_HEADER_NEWHOPE_H
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#include <openssl/base.h>
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#include <openssl/sha.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Post-quantum key agreement, based upon the reference
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* implementation. Note: this implementation does not interoperate
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* with the reference implementation!
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*
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* Source: https://github.com/tpoeppelmann/newhope
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*
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* The authors' permission to use their code is gratefully acknowledged. */
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/* NEWHOPE_POLY_new returns a new |NEWHOPE_POLY| object, or NULL on error. */
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OPENSSL_EXPORT NEWHOPE_POLY *NEWHOPE_POLY_new(void);
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/* NEWHOPE_POLY_free frees |p|. */
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OPENSSL_EXPORT void NEWHOPE_POLY_free(NEWHOPE_POLY *p);
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/* NEWHOPE_POLY_LENGTH is the size in bytes of the packed representation of a
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* polynomial, encoded with 14 bits per coefficient. */
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#define NEWHOPE_POLY_LENGTH ((1024 * 14) / 8)
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/* NEWHOPE_RECONCILIATION_LENGTH is the size in bytes of the packed
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* representation of the reconciliation data, encoded as 2 bits per
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* coefficient. */
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#define NEWHOPE_RECONCILIATION_LENGTH ((1024 * 2) / 8)
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/* NEWHOPE_OFFERMSG_LENGTH is the length of the offering party's message to the
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* accepting party. */
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#define NEWHOPE_OFFERMSG_LENGTH (NEWHOPE_POLY_LENGTH + 32)
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/* NEWHOPE_ACCEPTMSG_LENGTH is the length of the accepting party's message to
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* the offering party. */
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#define NEWHOPE_ACCEPTMSG_LENGTH \
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(NEWHOPE_POLY_LENGTH + NEWHOPE_RECONCILIATION_LENGTH)
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/* NEWHOPE_KEY_LENGTH is the size of the result of the key agreement. This
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* result is not exposed to callers: instead, it is whitened with SHA-256, whose
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* output happens to be the same size. */
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#define NEWHOPE_KEY_LENGTH 32
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/* NEWHOPE_offer initializes |out_msg| and |out_sk| for a new key
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* exchange. |msg| must have room for |NEWHOPE_OFFERMSG_LENGTH| bytes. Neither
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* output may be cached. */
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OPENSSL_EXPORT void NEWHOPE_offer(uint8_t out_msg[NEWHOPE_OFFERMSG_LENGTH],
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NEWHOPE_POLY *out_sk);
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/* NEWHOPE_accept completes a key exchange given an offer message |msg|. The
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* result of the key exchange is written to |out_key|, which must have space for
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* |SHA256_DIGEST_LENGTH| bytes. The message to be send to the offering party is
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* written to |out_msg|, which must have room for |NEWHOPE_ACCEPTMSG_LENGTH|
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* bytes. Returns 1 on success and 0 on error. */
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OPENSSL_EXPORT int NEWHOPE_accept(uint8_t out_key[SHA256_DIGEST_LENGTH],
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uint8_t out_msg[NEWHOPE_ACCEPTMSG_LENGTH],
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const uint8_t msg[NEWHOPE_OFFERMSG_LENGTH],
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size_t msg_len);
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/* NEWHOPE_finish completes a key exchange for the offering party, given an
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* accept message |msg| and the previously generated secret |sk|. The result of
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* the key exchange is written to |out_key|, which must have space for
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* |SHA256_DIGEST_LENGTH| bytes. Returns 1 on success and 0 on error. */
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OPENSSL_EXPORT int NEWHOPE_finish(uint8_t out_key[SHA256_DIGEST_LENGTH],
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const NEWHOPE_POLY *sk,
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const uint8_t msg[NEWHOPE_ACCEPTMSG_LENGTH],
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size_t msg_len);
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/* Lower-level functions. */
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/* NEWHOPE_POLY_noise sets |r| to a random polynomial where the coefficients are
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* sampled from the noise distribution. */
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OPENSSL_EXPORT void NEWHOPE_POLY_noise(NEWHOPE_POLY* r);
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/* NEWHOPE_POLY_noise_ntt sets |r| to an output of NEWHOPE_POLY_noise, and then
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* applies NTT(r) in-place. */
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OPENSSL_EXPORT void NEWHOPE_POLY_noise_ntt(NEWHOPE_POLY* r);
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/* NEWHOPE_offer_computation is the work of |NEWHOPE_offer|, less the encoding
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* parts. The inputs are the noise polynomials |s| and |e|, and random
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* polynomial |a|. The output is the polynomial |pk|. */
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OPENSSL_EXPORT void NEWHOPE_offer_computation(
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NEWHOPE_POLY *out_pk,
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const NEWHOPE_POLY *s, const NEWHOPE_POLY *e, const NEWHOPE_POLY *a);
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/* NEWHOPE_accept_computation is the work of |NEWHOPE_accept|, less the encoding
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* parts. The inputs from the peer are |pk| and |a|. The locally-generated
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* inputs are the noise polynomials |sp|, |ep|, and |epp|, and the random bytes
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* |rand|. The outputs are |out_bp| and |out_reconciliation|, and the result of
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* key agreement |key|. Returns 1 on success and 0 on failure. */
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OPENSSL_EXPORT void NEWHOPE_accept_computation(
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uint8_t out_key[NEWHOPE_KEY_LENGTH], NEWHOPE_POLY *out_bp,
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NEWHOPE_POLY *out_reconciliation,
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const NEWHOPE_POLY *sp, const NEWHOPE_POLY *ep, const NEWHOPE_POLY *epp,
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const uint8_t rand[32],
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const NEWHOPE_POLY *pk, const NEWHOPE_POLY *a);
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/* NEWHOPE_finish_computation is the work of |NEWHOPE_finish|, less the encoding
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* parts. Given the peer's |bp| and |reconciliation|, and locally-generated
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* noise |noise|, the result of the key agreement is written to out_key.
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* Returns 1 on success and 0 on failure. */
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OPENSSL_EXPORT void NEWHOPE_finish_computation(
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uint8_t out_key[NEWHOPE_KEY_LENGTH], const NEWHOPE_POLY *noise,
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const NEWHOPE_POLY *bp, const NEWHOPE_POLY *reconciliation);
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/* NEWHOPE_POLY_frombytes decodes |a| into |r|. */
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OPENSSL_EXPORT void NEWHOPE_POLY_frombytes(
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NEWHOPE_POLY *r, const uint8_t a[NEWHOPE_POLY_LENGTH]);
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/* NEWHOPE_POLY_tobytes packs the polynomial |p| into the compact representation
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* |r|. */
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OPENSSL_EXPORT void NEWHOPE_POLY_tobytes(uint8_t r[NEWHOPE_POLY_LENGTH],
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const NEWHOPE_POLY* p);
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/* NEWHOPE_offer_frommsg decodes an offer message |msg| into its constituent
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* polynomials |out_pk| and |a|. */
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OPENSSL_EXPORT void NEWHOPE_offer_frommsg(
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NEWHOPE_POLY *out_pk, NEWHOPE_POLY *out_a,
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const uint8_t msg[NEWHOPE_OFFERMSG_LENGTH]);
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#if defined(__cplusplus)
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} /* extern "C" */
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#endif
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#endif /* OPENSSL_HEADER_NEWHOPE_H */
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