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