1 /* 2 This file is basically ref10/fe_frombytes.h. 3 */ 4 5 #include "fe.h" 6 7 #ifdef HAVE_AVX_ASM 8 9 static uint64_t load_3(const unsigned char * in)10load_3(const unsigned char *in) 11 { 12 uint64_t result; 13 result = (uint64_t) in[0]; 14 result |= ((uint64_t) in[1]) << 8; 15 result |= ((uint64_t) in[2]) << 16; 16 return result; 17 } 18 19 static uint64_t load_4(const unsigned char * in)20load_4(const unsigned char *in) 21 { 22 uint64_t result; 23 result = (uint64_t) in[0]; 24 result |= ((uint64_t) in[1]) << 8; 25 result |= ((uint64_t) in[2]) << 16; 26 result |= ((uint64_t) in[3]) << 24; 27 return result; 28 } 29 30 void fe_frombytes(fe h,const unsigned char * s)31fe_frombytes(fe h, const unsigned char *s) 32 { 33 uint64_t h0 = load_4(s); 34 uint64_t h1 = load_3(s + 4) << 6; 35 uint64_t h2 = load_3(s + 7) << 5; 36 uint64_t h3 = load_3(s + 10) << 3; 37 uint64_t h4 = load_3(s + 13) << 2; 38 uint64_t h5 = load_4(s + 16); 39 uint64_t h6 = load_3(s + 20) << 7; 40 uint64_t h7 = load_3(s + 23) << 5; 41 uint64_t h8 = load_3(s + 26) << 4; 42 uint64_t h9 = (load_3(s + 29) & 8388607) << 2; 43 uint64_t carry0; 44 uint64_t carry1; 45 uint64_t carry2; 46 uint64_t carry3; 47 uint64_t carry4; 48 uint64_t carry5; 49 uint64_t carry6; 50 uint64_t carry7; 51 uint64_t carry8; 52 uint64_t carry9; 53 54 carry9 = h9 >> 25; h0 += carry9 * 19; h9 &= 0x1FFFFFF; 55 carry1 = h1 >> 25; h2 += carry1; h1 &= 0x1FFFFFF; 56 carry3 = h3 >> 25; h4 += carry3; h3 &= 0x1FFFFFF; 57 carry5 = h5 >> 25; h6 += carry5; h5 &= 0x1FFFFFF; 58 carry7 = h7 >> 25; h8 += carry7; h7 &= 0x1FFFFFF; 59 60 carry0 = h0 >> 26; h1 += carry0; h0 &= 0x3FFFFFF; 61 carry2 = h2 >> 26; h3 += carry2; h2 &= 0x3FFFFFF; 62 carry4 = h4 >> 26; h5 += carry4; h4 &= 0x3FFFFFF; 63 carry6 = h6 >> 26; h7 += carry6; h6 &= 0x3FFFFFF; 64 carry8 = h8 >> 26; h9 += carry8; h8 &= 0x3FFFFFF; 65 66 h[0] = h0; 67 h[1] = h1; 68 h[2] = h2; 69 h[3] = h3; 70 h[4] = h4; 71 h[5] = h5; 72 h[6] = h6; 73 h[7] = h7; 74 h[8] = h8; 75 h[9] = h9; 76 } 77 78 #endif 79