| /* 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" */ |
| #endif |
| |
| #endif /* OPENSSL_HEADER_NEWHOPE_H */ |