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

   1 #include "sc.h"
   2 #include "crypto_int64.h"
   3 #include "crypto_uint32.h"
   4 #include "crypto_uint64.h"
   5
   6 static crypto_uint64 load_3(const unsigned char *in)
   7 {
   8   crypto_uint64 result;
   9   result = (crypto_uint64) in[0];
  10   result |= ((crypto_uint64) in[1]) << 8;
  11   result |= ((crypto_uint64) in[2]) << 16;
  12   return result;
  13 }
  14
  15 static crypto_uint64 load_4(const unsigned char *in)
  16 {
  17   crypto_uint64 result;
  18   result = (crypto_uint64) in[0];
  19   result |= ((crypto_uint64) in[1]) << 8;
  20   result |= ((crypto_uint64) in[2]) << 16;
  21   result |= ((crypto_uint64) in[3]) << 24;
  22   return result;
  23 }
  24
  25 /*
  26 Input:
  27   a[0]+256*a[1]+...+256^31*a[31] = a
  28   b[0]+256*b[1]+...+256^31*b[31] = b
  29   c[0]+256*c[1]+...+256^31*c[31] = c
  30
  31 Output:
  32   s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
  33   where l = 2^252 + 27742317777372353535851937790883648493.
  34 */
  35
  36 void sc_muladd(unsigned char *s,const unsigned char *a,const unsigned char *b,const unsigned char *c)
  37 {
  38   crypto_int64 a0 = 2097151 & load_3(a);
  39   crypto_int64 a1 = 2097151 & (load_4(a + 2) >> 5);
  40   crypto_int64 a2 = 2097151 & (load_3(a + 5) >> 2);
  41   crypto_int64 a3 = 2097151 & (load_4(a + 7) >> 7);
  42   crypto_int64 a4 = 2097151 & (load_4(a + 10) >> 4);
  43   crypto_int64 a5 = 2097151 & (load_3(a + 13) >> 1);
  44   crypto_int64 a6 = 2097151 & (load_4(a + 15) >> 6);
  45   crypto_int64 a7 = 2097151 & (load_3(a + 18) >> 3);
  46   crypto_int64 a8 = 2097151 & load_3(a + 21);
  47   crypto_int64 a9 = 2097151 & (load_4(a + 23) >> 5);
  48   crypto_int64 a10 = 2097151 & (load_3(a + 26) >> 2);
  49   crypto_int64 a11 = (load_4(a + 28) >> 7);
  50   crypto_int64 b0 = 2097151 & load_3(b);
  51   crypto_int64 b1 = 2097151 & (load_4(b + 2) >> 5);
  52   crypto_int64 b2 = 2097151 & (load_3(b + 5) >> 2);
  53   crypto_int64 b3 = 2097151 & (load_4(b + 7) >> 7);
  54   crypto_int64 b4 = 2097151 & (load_4(b + 10) >> 4);
  55   crypto_int64 b5 = 2097151 & (load_3(b + 13) >> 1);
  56   crypto_int64 b6 = 2097151 & (load_4(b + 15) >> 6);
  57   crypto_int64 b7 = 2097151 & (load_3(b + 18) >> 3);
  58   crypto_int64 b8 = 2097151 & load_3(b + 21);
  59   crypto_int64 b9 = 2097151 & (load_4(b + 23) >> 5);
  60   crypto_int64 b10 = 2097151 & (load_3(b + 26) >> 2);
  61   crypto_int64 b11 = (load_4(b + 28) >> 7);
  62   crypto_int64 c0 = 2097151 & load_3(c);
  63   crypto_int64 c1 = 2097151 & (load_4(c + 2) >> 5);
  64   crypto_int64 c2 = 2097151 & (load_3(c + 5) >> 2);
  65   crypto_int64 c3 = 2097151 & (load_4(c + 7) >> 7);
  66   crypto_int64 c4 = 2097151 & (load_4(c + 10) >> 4);
  67   crypto_int64 c5 = 2097151 & (load_3(c + 13) >> 1);
  68   crypto_int64 c6 = 2097151 & (load_4(c + 15) >> 6);
  69   crypto_int64 c7 = 2097151 & (load_3(c + 18) >> 3);
  70   crypto_int64 c8 = 2097151 & load_3(c + 21);
  71   crypto_int64 c9 = 2097151 & (load_4(c + 23) >> 5);
  72   crypto_int64 c10 = 2097151 & (load_3(c + 26) >> 2);
  73   crypto_int64 c11 = (load_4(c + 28) >> 7);
  74   crypto_int64 s0;
  75   crypto_int64 s1;
  76   crypto_int64 s2;
  77   crypto_int64 s3;
  78   crypto_int64 s4;
  79   crypto_int64 s5;
  80   crypto_int64 s6;
  81   crypto_int64 s7;
  82   crypto_int64 s8;
  83   crypto_int64 s9;
  84   crypto_int64 s10;
  85   crypto_int64 s11;
  86   crypto_int64 s12;
  87   crypto_int64 s13;
  88   crypto_int64 s14;
  89   crypto_int64 s15;
  90   crypto_int64 s16;
  91   crypto_int64 s17;
  92   crypto_int64 s18;
  93   crypto_int64 s19;
  94   crypto_int64 s20;
  95   crypto_int64 s21;
  96   crypto_int64 s22;
  97   crypto_int64 s23;
  98   crypto_int64 carry0;
  99   crypto_int64 carry1;
 100   crypto_int64 carry2;
 101   crypto_int64 carry3;
 102   crypto_int64 carry4;
 103   crypto_int64 carry5;
 104   crypto_int64 carry6;
 105   crypto_int64 carry7;
 106   crypto_int64 carry8;
 107   crypto_int64 carry9;
 108   crypto_int64 carry10;
 109   crypto_int64 carry11;
 110   crypto_int64 carry12;
 111   crypto_int64 carry13;
 112   crypto_int64 carry14;
 113   crypto_int64 carry15;
 114   crypto_int64 carry16;
 115   crypto_int64 carry17;
 116   crypto_int64 carry18;
 117   crypto_int64 carry19;
 118   crypto_int64 carry20;
 119   crypto_int64 carry21;
 120   crypto_int64 carry22;
 121
 122   s0 = c0 + a0*b0;
 123   s1 = c1 + a0*b1 + a1*b0;
 124   s2 = c2 + a0*b2 + a1*b1 + a2*b0;
 125   s3 = c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0;
 126   s4 = c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0;
 127   s5 = c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0;
 128   s6 = c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0;
 129   s7 = c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0;
 130   s8 = c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0;
 131   s9 = c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0;
 132   s10 = c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0;
 133   s11 = c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0;
 134   s12 = a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1;
 135   s13 = a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2;
 136   s14 = a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3;
 137   s15 = a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4;
 138   s16 = a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5;
 139   s17 = a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6;
 140   s18 = a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7;
 141   s19 = a8*b11 + a9*b10 + a10*b9 + a11*b8;
 142   s20 = a9*b11 + a10*b10 + a11*b9;
 143   s21 = a10*b11 + a11*b10;
 144   s22 = a11*b11;
 145   s23 = 0;
 146
 147   carry0 = (s0 + (1<<20)) >> 21; s1 += carry0; s0 -= carry0 << 21;
 148   carry2 = (s2 + (1<<20)) >> 21; s3 += carry2; s2 -= carry2 << 21;
 149   carry4 = (s4 + (1<<20)) >> 21; s5 += carry4; s4 -= carry4 << 21;
 150   carry6 = (s6 + (1<<20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
 151   carry8 = (s8 + (1<<20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
 152   carry10 = (s10 + (1<<20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
 153   carry12 = (s12 + (1<<20)) >> 21; s13 += carry12; s12 -= carry12 << 21;
 154   carry14 = (s14 + (1<<20)) >> 21; s15 += carry14; s14 -= carry14 << 21;
 155   carry16 = (s16 + (1<<20)) >> 21; s17 += carry16; s16 -= carry16 << 21;
 156   carry18 = (s18 + (1<<20)) >> 21; s19 += carry18; s18 -= carry18 << 21;
 157   carry20 = (s20 + (1<<20)) >> 21; s21 += carry20; s20 -= carry20 << 21;
 158   carry22 = (s22 + (1<<20)) >> 21; s23 += carry22; s22 -= carry22 << 21;
 159
 160   carry1 = (s1 + (1<<20)) >> 21; s2 += carry1; s1 -= carry1 << 21;
 161   carry3 = (s3 + (1<<20)) >> 21; s4 += carry3; s3 -= carry3 << 21;
 162   carry5 = (s5 + (1<<20)) >> 21; s6 += carry5; s5 -= carry5 << 21;
 163   carry7 = (s7 + (1<<20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
 164   carry9 = (s9 + (1<<20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
 165   carry11 = (s11 + (1<<20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
 166   carry13 = (s13 + (1<<20)) >> 21; s14 += carry13; s13 -= carry13 << 21;
 167   carry15 = (s15 + (1<<20)) >> 21; s16 += carry15; s15 -= carry15 << 21;
 168   carry17 = (s17 + (1<<20)) >> 21; s18 += carry17; s17 -= carry17 << 21;
 169   carry19 = (s19 + (1<<20)) >> 21; s20 += carry19; s19 -= carry19 << 21;
 170   carry21 = (s21 + (1<<20)) >> 21; s22 += carry21; s21 -= carry21 << 21;
 171
 172   s11 += s23 * 666643;
 173   s12 += s23 * 470296;
 174   s13 += s23 * 654183;
 175   s14 -= s23 * 997805;
 176   s15 += s23 * 136657;
 177   s16 -= s23 * 683901;
 178   s23 = 0;
 179
 180   s10 += s22 * 666643;
 181   s11 += s22 * 470296;
 182   s12 += s22 * 654183;
 183   s13 -= s22 * 997805;
 184   s14 += s22 * 136657;
 185   s15 -= s22 * 683901;
 186   s22 = 0;
 187
 188   s9 += s21 * 666643;
 189   s10 += s21 * 470296;
 190   s11 += s21 * 654183;
 191   s12 -= s21 * 997805;
 192   s13 += s21 * 136657;
 193   s14 -= s21 * 683901;
 194   s21 = 0;
 195
 196   s8 += s20 * 666643;
 197   s9 += s20 * 470296;
 198   s10 += s20 * 654183;
 199   s11 -= s20 * 997805;
 200   s12 += s20 * 136657;
 201   s13 -= s20 * 683901;
 202   s20 = 0;
 203
 204   s7 += s19 * 666643;
 205   s8 += s19 * 470296;
 206   s9 += s19 * 654183;
 207   s10 -= s19 * 997805;
 208   s11 += s19 * 136657;
 209   s12 -= s19 * 683901;
 210   s19 = 0;
 211
 212   s6 += s18 * 666643;
 213   s7 += s18 * 470296;
 214   s8 += s18 * 654183;
 215   s9 -= s18 * 997805;
 216   s10 += s18 * 136657;
 217   s11 -= s18 * 683901;
 218   s18 = 0;
 219
 220   carry6 = (s6 + (1<<20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
 221   carry8 = (s8 + (1<<20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
 222   carry10 = (s10 + (1<<20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
 223   carry12 = (s12 + (1<<20)) >> 21; s13 += carry12; s12 -= carry12 << 21;
 224   carry14 = (s14 + (1<<20)) >> 21; s15 += carry14; s14 -= carry14 << 21;
 225   carry16 = (s16 + (1<<20)) >> 21; s17 += carry16; s16 -= carry16 << 21;
 226
 227   carry7 = (s7 + (1<<20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
 228   carry9 = (s9 + (1<<20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
 229   carry11 = (s11 + (1<<20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
 230   carry13 = (s13 + (1<<20)) >> 21; s14 += carry13; s13 -= carry13 << 21;
 231   carry15 = (s15 + (1<<20)) >> 21; s16 += carry15; s15 -= carry15 << 21;
 232
 233   s5 += s17 * 666643;
 234   s6 += s17 * 470296;
 235   s7 += s17 * 654183;
 236   s8 -= s17 * 997805;
 237   s9 += s17 * 136657;
 238   s10 -= s17 * 683901;
 239   s17 = 0;
 240
 241   s4 += s16 * 666643;
 242   s5 += s16 * 470296;
 243   s6 += s16 * 654183;
 244   s7 -= s16 * 997805;
 245   s8 += s16 * 136657;
 246   s9 -= s16 * 683901;
 247   s16 = 0;
 248
 249   s3 += s15 * 666643;
 250   s4 += s15 * 470296;
 251   s5 += s15 * 654183;
 252   s6 -= s15 * 997805;
 253   s7 += s15 * 136657;
 254   s8 -= s15 * 683901;
 255   s15 = 0;
 256
 257   s2 += s14 * 666643;
 258   s3 += s14 * 470296;
 259   s4 += s14 * 654183;
 260   s5 -= s14 * 997805;
 261   s6 += s14 * 136657;
 262   s7 -= s14 * 683901;
 263   s14 = 0;
 264
 265   s1 += s13 * 666643;
 266   s2 += s13 * 470296;
 267   s3 += s13 * 654183;
 268   s4 -= s13 * 997805;
 269   s5 += s13 * 136657;
 270   s6 -= s13 * 683901;
 271   s13 = 0;
 272
 273   s0 += s12 * 666643;
 274   s1 += s12 * 470296;
 275   s2 += s12 * 654183;
 276   s3 -= s12 * 997805;
 277   s4 += s12 * 136657;
 278   s5 -= s12 * 683901;
 279   s12 = 0;
 280
 281   carry0 = (s0 + (1<<20)) >> 21; s1 += carry0; s0 -= carry0 << 21;
 282   carry2 = (s2 + (1<<20)) >> 21; s3 += carry2; s2 -= carry2 << 21;
 283   carry4 = (s4 + (1<<20)) >> 21; s5 += carry4; s4 -= carry4 << 21;
 284   carry6 = (s6 + (1<<20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
 285   carry8 = (s8 + (1<<20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
 286   carry10 = (s10 + (1<<20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
 287
 288   carry1 = (s1 + (1<<20)) >> 21; s2 += carry1; s1 -= carry1 << 21;
 289   carry3 = (s3 + (1<<20)) >> 21; s4 += carry3; s3 -= carry3 << 21;
 290   carry5 = (s5 + (1<<20)) >> 21; s6 += carry5; s5 -= carry5 << 21;
 291   carry7 = (s7 + (1<<20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
 292   carry9 = (s9 + (1<<20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
 293   carry11 = (s11 + (1<<20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
 294
 295   s0 += s12 * 666643;
 296   s1 += s12 * 470296;
 297   s2 += s12 * 654183;
 298   s3 -= s12 * 997805;
 299   s4 += s12 * 136657;
 300   s5 -= s12 * 683901;
 301   s12 = 0;
 302
 303   carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21;
 304   carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21;
 305   carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21;
 306   carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21;
 307   carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21;
 308   carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21;
 309   carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21;
 310   carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21;
 311   carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21;
 312   carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21;
 313   carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21;
 314   carry11 = s11 >> 21; s12 += carry11; s11 -= carry11 << 21;
 315
 316   s0 += s12 * 666643;
 317   s1 += s12 * 470296;
 318   s2 += s12 * 654183;
 319   s3 -= s12 * 997805;
 320   s4 += s12 * 136657;
 321   s5 -= s12 * 683901;
 322   s12 = 0;
 323
 324   carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21;
 325   carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21;
 326   carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21;
 327   carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21;
 328   carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21;
 329   carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21;
 330   carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21;
 331   carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21;
 332   carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21;
 333   carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21;
 334   carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21;
 335
 336   s[0] = s0 >> 0;
 337   s[1] = s0 >> 8;
 338   s[2] = (s0 >> 16) | (s1 << 5);
 339   s[3] = s1 >> 3;
 340   s[4] = s1 >> 11;
 341   s[5] = (s1 >> 19) | (s2 << 2);
 342   s[6] = s2 >> 6;
 343   s[7] = (s2 >> 14) | (s3 << 7);
 344   s[8] = s3 >> 1;
 345   s[9] = s3 >> 9;
 346   s[10] = (s3 >> 17) | (s4 << 4);
 347   s[11] = s4 >> 4;
 348   s[12] = s4 >> 12;
 349   s[13] = (s4 >> 20) | (s5 << 1);
 350   s[14] = s5 >> 7;
 351   s[15] = (s5 >> 15) | (s6 << 6);
 352   s[16] = s6 >> 2;
 353   s[17] = s6 >> 10;
 354   s[18] = (s6 >> 18) | (s7 << 3);
 355   s[19] = s7 >> 5;
 356   s[20] = s7 >> 13;
 357   s[21] = s8 >> 0;
 358   s[22] = s8 >> 8;
 359   s[23] = (s8 >> 16) | (s9 << 5);
 360   s[24] = s9 >> 3;
 361   s[25] = s9 >> 11;
 362   s[26] = (s9 >> 19) | (s10 << 2);
 363   s[27] = s10 >> 6;
 364   s[28] = (s10 >> 14) | (s11 << 7);
 365   s[29] = s11 >> 1;
 366   s[30] = s11 >> 9;
 367   s[31] = s11 >> 17;
 368 }