/* This file is for loading/storing data in a little-endian fashion */ #include "util.h" #include "vec.h" #include <stdint.h> void PQCLEAN_MCELIECE6688128_VEC_store_i(unsigned char *out, uint64_t in, int i) { int j; for (j = 0; j < i; j++) { out[j] = (in >> (j * 8)) & 0xFF; } } void PQCLEAN_MCELIECE6688128_VEC_store2(unsigned char *dest, uint16_t a) { dest[0] = a & 0xFF; dest[1] = a >> 8; } uint16_t PQCLEAN_MCELIECE6688128_VEC_load2(const unsigned char *src) { uint16_t a; a = src[1]; a <<= 8; a |= src[0]; return a & GFMASK; } uint32_t PQCLEAN_MCELIECE6688128_VEC_load4(const unsigned char *src) { uint32_t a; a = src[3]; a <<= 8; a |= src[2]; a <<= 8; a |= src[1]; a <<= 8; a |= src[0]; return a; } void PQCLEAN_MCELIECE6688128_VEC_irr_load(vec out[][GFBITS], const unsigned char *in) { int i, j; uint64_t v[2]; uint16_t irr[ SYS_T + 1 ]; for (i = 0; i < SYS_T; i++) { irr[i] = PQCLEAN_MCELIECE6688128_VEC_load2(in + i * 2); irr[i] &= GFMASK; } irr[ SYS_T ] = 1; for (i = 0; i < GFBITS; i++) { v[0] = v[1] = 0; for (j = 63; j >= 0; j--) { v[0] <<= 1; v[0] |= (irr[j] >> i) & 1; } for (j = SYS_T; j >= 64; j--) { v[1] <<= 1; v[1] |= (irr[j] >> i) & 1; } out[0][i] = v[0]; out[1][i] = v[1]; } } void PQCLEAN_MCELIECE6688128_VEC_store8(unsigned char *out, uint64_t in) { out[0] = (in >> 0x00) & 0xFF; out[1] = (in >> 0x08) & 0xFF; out[2] = (in >> 0x10) & 0xFF; out[3] = (in >> 0x18) & 0xFF; out[4] = (in >> 0x20) & 0xFF; out[5] = (in >> 0x28) & 0xFF; out[6] = (in >> 0x30) & 0xFF; out[7] = (in >> 0x38) & 0xFF; } uint64_t PQCLEAN_MCELIECE6688128_VEC_load8(const unsigned char *in) { int i; uint64_t ret = in[7]; for (i = 6; i >= 0; i--) { ret <<= 8; ret |= in[i]; } return ret; }