1 /*
2 This file is for loading/storing data in a little-endian fashion
3 */
4
5 #include "util.h"
6
PQCLEAN_MCELIECE348864_AVX_store_i(unsigned char * out,uint64_t in,int i)7 void PQCLEAN_MCELIECE348864_AVX_store_i(unsigned char *out, uint64_t in, int i) {
8 int j;
9
10 for (j = 0; j < i; j++) {
11 out[j] = (in >> (j * 8)) & 0xFF;
12 }
13 }
14
PQCLEAN_MCELIECE348864_AVX_store2(unsigned char * dest,gf a)15 void PQCLEAN_MCELIECE348864_AVX_store2(unsigned char *dest, gf a) {
16 dest[0] = a & 0xFF;
17 dest[1] = a >> 8;
18 }
19
PQCLEAN_MCELIECE348864_AVX_load2(const unsigned char * src)20 uint16_t PQCLEAN_MCELIECE348864_AVX_load2(const unsigned char *src) {
21 uint16_t a;
22
23 a = src[1];
24 a <<= 8;
25 a |= src[0];
26
27 return a & GFMASK;
28 }
29
PQCLEAN_MCELIECE348864_AVX_load4(const unsigned char * src)30 uint32_t PQCLEAN_MCELIECE348864_AVX_load4(const unsigned char *src) {
31 uint32_t a;
32
33 a = src[3];
34 a <<= 8;
35 a |= src[2];
36 a <<= 8;
37 a |= src[1];
38 a <<= 8;
39 a |= src[0];
40
41 return a;
42 }
43
PQCLEAN_MCELIECE348864_AVX_irr_load(uint64_t * out,const unsigned char * in)44 void PQCLEAN_MCELIECE348864_AVX_irr_load(uint64_t *out, const unsigned char *in) {
45 int i, j;
46 uint16_t irr[ SYS_T + 1 ];
47
48 for (i = 0; i < SYS_T; i++) {
49 irr[i] = PQCLEAN_MCELIECE348864_AVX_load2(in + i * 2);
50 irr[i] &= GFMASK;
51 }
52
53 irr[ SYS_T ] = 1;
54
55 for (i = 0; i < GFBITS; i++) {
56 out[i] = 0;
57 }
58
59 for (i = SYS_T; i >= 0; i--) {
60 for (j = 0; j < GFBITS; j++) {
61 out[j] <<= 1;
62 out[j] |= (irr[i] >> j) & 1;
63 }
64 }
65 }
66
PQCLEAN_MCELIECE348864_AVX_store8(unsigned char * out,uint64_t in)67 void PQCLEAN_MCELIECE348864_AVX_store8(unsigned char *out, uint64_t in) {
68 out[0] = (in >> 0x00) & 0xFF;
69 out[1] = (in >> 0x08) & 0xFF;
70 out[2] = (in >> 0x10) & 0xFF;
71 out[3] = (in >> 0x18) & 0xFF;
72 out[4] = (in >> 0x20) & 0xFF;
73 out[5] = (in >> 0x28) & 0xFF;
74 out[6] = (in >> 0x30) & 0xFF;
75 out[7] = (in >> 0x38) & 0xFF;
76 }
77
PQCLEAN_MCELIECE348864_AVX_load8(const unsigned char * in)78 uint64_t PQCLEAN_MCELIECE348864_AVX_load8(const unsigned char *in) {
79 int i;
80 uint64_t ret = in[7];
81
82 for (i = 6; i >= 0; i--) {
83 ret <<= 8;
84 ret |= in[i];
85 }
86
87 return ret;
88 }
89
PQCLEAN_MCELIECE348864_AVX_bitrev(gf a)90 gf PQCLEAN_MCELIECE348864_AVX_bitrev(gf a) {
91 a = ((a & 0x00FF) << 8) | ((a & 0xFF00) >> 8);
92 a = ((a & 0x0F0F) << 4) | ((a & 0xF0F0) >> 4);
93 a = ((a & 0x3333) << 2) | ((a & 0xCCCC) >> 2);
94 a = ((a & 0x5555) << 1) | ((a & 0xAAAA) >> 1);
95
96 return a >> 4;
97 }
98
PQCLEAN_MCELIECE348864_AVX_load16(const unsigned char * in)99 vec128 PQCLEAN_MCELIECE348864_AVX_load16(const unsigned char *in) {
100 return PQCLEAN_MCELIECE348864_AVX_vec128_set2x( PQCLEAN_MCELIECE348864_AVX_load8(in), PQCLEAN_MCELIECE348864_AVX_load8(in + 8) );
101 }
102
PQCLEAN_MCELIECE348864_AVX_store16(unsigned char * out,vec128 in)103 void PQCLEAN_MCELIECE348864_AVX_store16(unsigned char *out, vec128 in) {
104 PQCLEAN_MCELIECE348864_AVX_store8(out + 0, PQCLEAN_MCELIECE348864_AVX_vec128_extract(in, 0));
105 PQCLEAN_MCELIECE348864_AVX_store8(out + 8, PQCLEAN_MCELIECE348864_AVX_vec128_extract(in, 1));
106 }
107