text: /* 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
  
  #include <GFp/base.h>
  
  #include <stdint.h>
  
  
  #if defined(__cplusplus)
  extern "C" {
  #endif
  
  
  #if defined(OPENSSL_X86_64) && !defined(OPENSSL_SMALL) && \
      !defined(OPENSSL_WINDOWS) && !defined(OPENSSL_NO_ASM)
  /* This isn't compatible with Windows because the asm code makes use of the red
   * zone, which Windows doesn't support. */
  #define BORINGSSL_X25519_X86_64
  
  void GFp_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 GFp_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.
   *
   * Keep in sync with `Elem` and `ELEM_LIMBS` in curve25519/ops.rs. */
  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)
   */
  
  /* Keep in sync with `Point` in curve25519/ops.rs. */
  typedef struct {
    fe X;
    fe Y;
    fe Z;
  } ge_p2;
  
  
  /* Keep in sync with `ExtPoint` in curve25519/ops.rs. */
  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;
  
  
  #if defined(__cplusplus)
  }  /* extern C */
  #endif
  
  #endif  /* OPENSSL_HEADER_CURVE25519_INTERNAL_H */
  