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- /* 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)
- #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 */
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