release/src/router/libsodium/src/libsodium/crypto_sign/ed25519/ref10/fe_neg.c

   1 #include "fe.h"
   2
   3 /*
   4 h = -f
   5
   6 Preconditions:
   7    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
   8
   9 Postconditions:
  10    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
  11 */
  12
  13 void fe_neg(fe h,const fe f)
  14 {
  15   crypto_int32 f0 = f[0];
  16   crypto_int32 f1 = f[1];
  17   crypto_int32 f2 = f[2];
  18   crypto_int32 f3 = f[3];
  19   crypto_int32 f4 = f[4];
  20   crypto_int32 f5 = f[5];
  21   crypto_int32 f6 = f[6];
  22   crypto_int32 f7 = f[7];
  23   crypto_int32 f8 = f[8];
  24   crypto_int32 f9 = f[9];
  25   crypto_int32 h0 = -f0;
  26   crypto_int32 h1 = -f1;
  27   crypto_int32 h2 = -f2;
  28   crypto_int32 h3 = -f3;
  29   crypto_int32 h4 = -f4;
  30   crypto_int32 h5 = -f5;
  31   crypto_int32 h6 = -f6;
  32   crypto_int32 h7 = -f7;
  33   crypto_int32 h8 = -f8;
  34   crypto_int32 h9 = -f9;
  35   h[0] = h0;
  36   h[1] = h1;
  37   h[2] = h2;
  38   h[3] = h3;
  39   h[4] = h4;
  40   h[5] = h5;
  41   h[6] = h6;
  42   h[7] = h7;
  43   h[8] = h8;
  44   h[9] = h9;
  45 }