-rw-r--r-- 1889 libmceliece-20240726/crypto_kem/6960119/avx/util.h raw
/* This file is for loading/storing data in a little-endian fashion */ #ifndef UTIL_H #define UTIL_H #include "vec128_gf.h" #include <stdint.h> static inline void store_i(unsigned char *out, uint64_t in, int i) { int j; for (j = 0; j < i; j++) out[j] = (in >> (j * 8)) & 0xFF; } static inline void store_gf(unsigned char *dest, uint16_t a) { dest[0] = a & 0xFF; dest[1] = a >> 8; } static inline uint16_t load_gf(const unsigned char *src) { uint16_t a; a = src[1]; a <<= 8; a |= src[0]; return a & GFMASK; } static inline uint32_t 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; } static inline void irr_load(vec128 * out, 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] = load_gf(in + i*2); 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[i] = vec128_set2x(v[0], v[1]); } } static inline void 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; } static inline uint64_t 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; } static inline vec128 load16(const unsigned char * in) { return vec128_set2x( load8(in), load8(in+8) ); } static inline void store16(unsigned char * out, vec128 in) { store8(out+0, vec128_extract(in, 0)); store8(out+8, vec128_extract(in, 1)); } #endif