release/src/router/libsodium/src/libsodium/crypto_sign/ed25519/ref10/fe_sq2.c

   1 #include "fe.h"
   2 #include "crypto_int64.h"
   3
   4 /*
   5 h = 2 * f * f
   6 Can overlap h with f.
   7
   8 Preconditions:
   9    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
  10
  11 Postconditions:
  12    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
  13 */
  14
  15 /*
  16 See fe_mul.c for discussion of implementation strategy.
  17 */
  18
  19 void fe_sq2(fe h,const fe f)
  20 {
  21   crypto_int32 f0 = f[0];
  22   crypto_int32 f1 = f[1];
  23   crypto_int32 f2 = f[2];
  24   crypto_int32 f3 = f[3];
  25   crypto_int32 f4 = f[4];
  26   crypto_int32 f5 = f[5];
  27   crypto_int32 f6 = f[6];
  28   crypto_int32 f7 = f[7];
  29   crypto_int32 f8 = f[8];
  30   crypto_int32 f9 = f[9];
  31   crypto_int32 f0_2 = 2 * f0;
  32   crypto_int32 f1_2 = 2 * f1;
  33   crypto_int32 f2_2 = 2 * f2;
  34   crypto_int32 f3_2 = 2 * f3;
  35   crypto_int32 f4_2 = 2 * f4;
  36   crypto_int32 f5_2 = 2 * f5;
  37   crypto_int32 f6_2 = 2 * f6;
  38   crypto_int32 f7_2 = 2 * f7;
  39   crypto_int32 f5_38 = 38 * f5; /* 1.959375*2^30 */
  40   crypto_int32 f6_19 = 19 * f6; /* 1.959375*2^30 */
  41   crypto_int32 f7_38 = 38 * f7; /* 1.959375*2^30 */
  42   crypto_int32 f8_19 = 19 * f8; /* 1.959375*2^30 */
  43   crypto_int32 f9_38 = 38 * f9; /* 1.959375*2^30 */
  44   crypto_int64 f0f0    = f0   * (crypto_int64) f0;
  45   crypto_int64 f0f1_2  = f0_2 * (crypto_int64) f1;
  46   crypto_int64 f0f2_2  = f0_2 * (crypto_int64) f2;
  47   crypto_int64 f0f3_2  = f0_2 * (crypto_int64) f3;
  48   crypto_int64 f0f4_2  = f0_2 * (crypto_int64) f4;
  49   crypto_int64 f0f5_2  = f0_2 * (crypto_int64) f5;
  50   crypto_int64 f0f6_2  = f0_2 * (crypto_int64) f6;
  51   crypto_int64 f0f7_2  = f0_2 * (crypto_int64) f7;
  52   crypto_int64 f0f8_2  = f0_2 * (crypto_int64) f8;
  53   crypto_int64 f0f9_2  = f0_2 * (crypto_int64) f9;
  54   crypto_int64 f1f1_2  = f1_2 * (crypto_int64) f1;
  55   crypto_int64 f1f2_2  = f1_2 * (crypto_int64) f2;
  56   crypto_int64 f1f3_4  = f1_2 * (crypto_int64) f3_2;
  57   crypto_int64 f1f4_2  = f1_2 * (crypto_int64) f4;
  58   crypto_int64 f1f5_4  = f1_2 * (crypto_int64) f5_2;
  59   crypto_int64 f1f6_2  = f1_2 * (crypto_int64) f6;
  60   crypto_int64 f1f7_4  = f1_2 * (crypto_int64) f7_2;
  61   crypto_int64 f1f8_2  = f1_2 * (crypto_int64) f8;
  62   crypto_int64 f1f9_76 = f1_2 * (crypto_int64) f9_38;
  63   crypto_int64 f2f2    = f2   * (crypto_int64) f2;
  64   crypto_int64 f2f3_2  = f2_2 * (crypto_int64) f3;
  65   crypto_int64 f2f4_2  = f2_2 * (crypto_int64) f4;
  66   crypto_int64 f2f5_2  = f2_2 * (crypto_int64) f5;
  67   crypto_int64 f2f6_2  = f2_2 * (crypto_int64) f6;
  68   crypto_int64 f2f7_2  = f2_2 * (crypto_int64) f7;
  69   crypto_int64 f2f8_38 = f2_2 * (crypto_int64) f8_19;
  70   crypto_int64 f2f9_38 = f2   * (crypto_int64) f9_38;
  71   crypto_int64 f3f3_2  = f3_2 * (crypto_int64) f3;
  72   crypto_int64 f3f4_2  = f3_2 * (crypto_int64) f4;
  73   crypto_int64 f3f5_4  = f3_2 * (crypto_int64) f5_2;
  74   crypto_int64 f3f6_2  = f3_2 * (crypto_int64) f6;
  75   crypto_int64 f3f7_76 = f3_2 * (crypto_int64) f7_38;
  76   crypto_int64 f3f8_38 = f3_2 * (crypto_int64) f8_19;
  77   crypto_int64 f3f9_76 = f3_2 * (crypto_int64) f9_38;
  78   crypto_int64 f4f4    = f4   * (crypto_int64) f4;
  79   crypto_int64 f4f5_2  = f4_2 * (crypto_int64) f5;
  80   crypto_int64 f4f6_38 = f4_2 * (crypto_int64) f6_19;
  81   crypto_int64 f4f7_38 = f4   * (crypto_int64) f7_38;
  82   crypto_int64 f4f8_38 = f4_2 * (crypto_int64) f8_19;
  83   crypto_int64 f4f9_38 = f4   * (crypto_int64) f9_38;
  84   crypto_int64 f5f5_38 = f5   * (crypto_int64) f5_38;
  85   crypto_int64 f5f6_38 = f5_2 * (crypto_int64) f6_19;
  86   crypto_int64 f5f7_76 = f5_2 * (crypto_int64) f7_38;
  87   crypto_int64 f5f8_38 = f5_2 * (crypto_int64) f8_19;
  88   crypto_int64 f5f9_76 = f5_2 * (crypto_int64) f9_38;
  89   crypto_int64 f6f6_19 = f6   * (crypto_int64) f6_19;
  90   crypto_int64 f6f7_38 = f6   * (crypto_int64) f7_38;
  91   crypto_int64 f6f8_38 = f6_2 * (crypto_int64) f8_19;
  92   crypto_int64 f6f9_38 = f6   * (crypto_int64) f9_38;
  93   crypto_int64 f7f7_38 = f7   * (crypto_int64) f7_38;
  94   crypto_int64 f7f8_38 = f7_2 * (crypto_int64) f8_19;
  95   crypto_int64 f7f9_76 = f7_2 * (crypto_int64) f9_38;
  96   crypto_int64 f8f8_19 = f8   * (crypto_int64) f8_19;
  97   crypto_int64 f8f9_38 = f8   * (crypto_int64) f9_38;
  98   crypto_int64 f9f9_38 = f9   * (crypto_int64) f9_38;
  99   crypto_int64 h0 = f0f0  +f1f9_76+f2f8_38+f3f7_76+f4f6_38+f5f5_38;
 100   crypto_int64 h1 = f0f1_2+f2f9_38+f3f8_38+f4f7_38+f5f6_38;
 101   crypto_int64 h2 = f0f2_2+f1f1_2 +f3f9_76+f4f8_38+f5f7_76+f6f6_19;
 102   crypto_int64 h3 = f0f3_2+f1f2_2 +f4f9_38+f5f8_38+f6f7_38;
 103   crypto_int64 h4 = f0f4_2+f1f3_4 +f2f2   +f5f9_76+f6f8_38+f7f7_38;
 104   crypto_int64 h5 = f0f5_2+f1f4_2 +f2f3_2 +f6f9_38+f7f8_38;
 105   crypto_int64 h6 = f0f6_2+f1f5_4 +f2f4_2 +f3f3_2 +f7f9_76+f8f8_19;
 106   crypto_int64 h7 = f0f7_2+f1f6_2 +f2f5_2 +f3f4_2 +f8f9_38;
 107   crypto_int64 h8 = f0f8_2+f1f7_4 +f2f6_2 +f3f5_4 +f4f4   +f9f9_38;
 108   crypto_int64 h9 = f0f9_2+f1f8_2 +f2f7_2 +f3f6_2 +f4f5_2;
 109   crypto_int64 carry0;
 110   crypto_int64 carry1;
 111   crypto_int64 carry2;
 112   crypto_int64 carry3;
 113   crypto_int64 carry4;
 114   crypto_int64 carry5;
 115   crypto_int64 carry6;
 116   crypto_int64 carry7;
 117   crypto_int64 carry8;
 118   crypto_int64 carry9;
 119
 120   h0 += h0;
 121   h1 += h1;
 122   h2 += h2;
 123   h3 += h3;
 124   h4 += h4;
 125   h5 += h5;
 126   h6 += h6;
 127   h7 += h7;
 128   h8 += h8;
 129   h9 += h9;
 130
 131   carry0 = (h0 + (crypto_int64) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
 132   carry4 = (h4 + (crypto_int64) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
 133
 134   carry1 = (h1 + (crypto_int64) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
 135   carry5 = (h5 + (crypto_int64) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
 136
 137   carry2 = (h2 + (crypto_int64) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
 138   carry6 = (h6 + (crypto_int64) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
 139
 140   carry3 = (h3 + (crypto_int64) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
 141   carry7 = (h7 + (crypto_int64) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
 142
 143   carry4 = (h4 + (crypto_int64) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
 144   carry8 = (h8 + (crypto_int64) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
 145
 146   carry9 = (h9 + (crypto_int64) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
 147
 148   carry0 = (h0 + (crypto_int64) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
 149
 150   h[0] = h0;
 151   h[1] = h1;
 152   h[2] = h2;
 153   h[3] = h3;
 154   h[4] = h4;
 155   h[5] = h5;
 156   h[6] = h6;
 157   h[7] = h7;
 158   h[8] = h8;
 159   h[9] = h9;
 160 }