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- // The MIT License (MIT)
- //
- // Copyright (c) 2015-2016 the fiat-crypto authors (see the AUTHORS file).
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy
- // of this software and associated documentation files (the "Software"), to deal
- // in the Software without restriction, including without limitation the rights
- // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- // copies of the Software, and to permit persons to whom the Software is
- // furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in all
- // copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- // SOFTWARE.
-
- #ifndef OPENSSL_HEADER_CURVE25519_INTERNAL_H
- #define OPENSSL_HEADER_CURVE25519_INTERNAL_H
-
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
- #include <openssl/base.h>
-
- #include "../../crypto/internal.h"
-
-
- #if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_APPLE)
- #define BORINGSSL_X25519_NEON
-
- // x25519_NEON is defined in asm/x25519-arm.S.
- void x25519_NEON(uint8_t out[32], const uint8_t scalar[32],
- const uint8_t point[32]);
- #endif
-
- #if defined(BORINGSSL_HAS_UINT128)
- #define BORINGSSL_CURVE25519_64BIT
- #endif
-
- #if defined(BORINGSSL_CURVE25519_64BIT)
- // fe means field element. Here the field is \Z/(2^255-19). An element t,
- // entries t[0]...t[4], represents the integer t[0]+2^51 t[1]+2^102 t[2]+2^153
- // t[3]+2^204 t[4].
- // fe limbs are bounded by 1.125*2^51.
- // Multiplication and carrying produce fe from fe_loose.
- typedef struct fe { uint64_t v[5]; } fe;
-
- // fe_loose limbs are bounded by 3.375*2^51.
- // Addition and subtraction produce fe_loose from (fe, fe).
- typedef struct fe_loose { uint64_t v[5]; } fe_loose;
- #else
- // fe means field element. Here the field is \Z/(2^255-19). An element t,
- // entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
- // t[3]+2^102 t[4]+...+2^230 t[9].
- // fe limbs are bounded by 1.125*2^26,1.125*2^25,1.125*2^26,1.125*2^25,etc.
- // Multiplication and carrying produce fe from fe_loose.
- typedef struct fe { uint32_t v[10]; } fe;
-
- // fe_loose limbs are bounded by 3.375*2^26,3.375*2^25,3.375*2^26,3.375*2^25,etc.
- // Addition and subtraction produce fe_loose from (fe, fe).
- typedef struct fe_loose { uint32_t v[10]; } fe_loose;
- #endif
-
- // ge means group element.
- //
- // Here the group is the set of pairs (x,y) of field elements (see fe.h)
- // satisfying -x^2 + y^2 = 1 + d x^2y^2
- // where d = -121665/121666.
- //
- // Representations:
- // ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
- // ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
- // ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
- // ge_precomp (Duif): (y+x,y-x,2dxy)
-
- typedef struct {
- fe X;
- fe Y;
- fe Z;
- } ge_p2;
-
- typedef struct {
- fe X;
- fe Y;
- fe Z;
- fe T;
- } ge_p3;
-
- typedef struct {
- fe_loose X;
- fe_loose Y;
- fe_loose Z;
- fe_loose T;
- } ge_p1p1;
-
- typedef struct {
- fe_loose yplusx;
- fe_loose yminusx;
- fe_loose xy2d;
- } ge_precomp;
-
- typedef struct {
- fe_loose YplusX;
- fe_loose YminusX;
- fe_loose Z;
- fe_loose T2d;
- } ge_cached;
-
- void x25519_ge_tobytes(uint8_t s[32], const ge_p2 *h);
- int x25519_ge_frombytes_vartime(ge_p3 *h, const uint8_t *s);
- void x25519_ge_p3_to_cached(ge_cached *r, const ge_p3 *p);
- void x25519_ge_p1p1_to_p2(ge_p2 *r, const ge_p1p1 *p);
- void x25519_ge_p1p1_to_p3(ge_p3 *r, const ge_p1p1 *p);
- void x25519_ge_add(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
- void x25519_ge_sub(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
- void x25519_ge_scalarmult_small_precomp(
- ge_p3 *h, const uint8_t a[32], const uint8_t precomp_table[15 * 2 * 32]);
- void x25519_ge_scalarmult_base(ge_p3 *h, const uint8_t a[32]);
- void x25519_ge_scalarmult(ge_p2 *r, const uint8_t *scalar, const ge_p3 *A);
- void x25519_sc_reduce(uint8_t s[64]);
-
- enum spake2_state_t {
- spake2_state_init = 0,
- spake2_state_msg_generated,
- spake2_state_key_generated,
- };
-
- struct spake2_ctx_st {
- uint8_t private_key[32];
- uint8_t my_msg[32];
- uint8_t password_scalar[32];
- uint8_t password_hash[64];
- uint8_t *my_name;
- size_t my_name_len;
- uint8_t *their_name;
- size_t their_name_len;
- enum spake2_role_t my_role;
- enum spake2_state_t state;
- char disable_password_scalar_hack;
- };
-
-
- #if defined(__cplusplus)
- } // extern C
- #endif
-
- #endif // OPENSSL_HEADER_CURVE25519_INTERNAL_H
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