| /* Copyright (c) 2015, 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_CURVE25519_INTERNAL_H |
| #define OPENSSL_HEADER_CURVE25519_INTERNAL_H |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| #if defined(OPENSSL_X86_64) && !defined(OPENSSL_SMALL) && \ |
| !defined(OPENSSL_WINDOWS) && !defined(OPENSSL_NO_ASM) |
| #define BORINGSSL_X25519_X86_64 |
| |
| void x25519_x86_64(uint8_t out[32], const uint8_t scalar[32], |
| const uint8_t point[32]); |
| #endif |
| |
| |
| #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 |
| |
| // 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]. Bounds on each t[i] vary depending on |
| // context. |
| typedef int32_t fe[10]; |
| |
| /* 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 X; |
| fe Y; |
| fe Z; |
| fe T; |
| } ge_p1p1; |
| |
| typedef struct { |
| fe yplusx; |
| fe yminusx; |
| fe xy2d; |
| } ge_precomp; |
| |
| typedef struct { |
| fe YplusX; |
| fe YminusX; |
| fe Z; |
| fe T2d; |
| } ge_cached; |
| |
| void x25519_ge_tobytes(uint8_t *s, 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); |
| |
| |
| #if defined(__cplusplus) |
| } // extern C |
| #endif |
| |
| #endif // OPENSSL_HEADER_CURVE25519_INTERNAL_H |