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https://github.com/henrydcase/pqc.git
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b3f9d4f8d6
* Add McEliece reference implementations * Add Vec implementations of McEliece * Add sse implementations * Add AVX2 implementations * Get rid of stuff not supported by Mac ABI * restrict to two cores * Ditch .data files * Remove .hidden from all .S files * speed up duplicate consistency tests by batching * make cpuinfo more robust * Hope to stabilize macos cpuinfo without ccache * Revert "Hope to stabilize macos cpuinfo without ccache" This reverts commit 6129c3cabe1abbc8b956bc87e902a698e32bf322. * Just hardcode what's available at travis * Fixed-size types in api.h * namespace all header files in mceliece * Ditch operations.h * Get rid of static inline functions * fixup! Ditch operations.h
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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This file is for Benes network related functions
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*/
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#include "benes.h"
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#include "params.h"
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#include "transpose.h"
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#include "util.h"
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/* one layer of the benes network */
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static void layer(uint64_t *data, uint64_t *bits, int lgs) {
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int i, j, s;
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uint64_t d;
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s = 1 << lgs;
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for (i = 0; i < 64; i += s * 2) {
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for (j = i; j < i + s; j++) {
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d = (data[j + 0] ^ data[j + s]);
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d &= (*bits++);
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data[j + 0] ^= d;
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data[j + s] ^= d;
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}
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}
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}
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/* input: r, sequence of bits to be permuted */
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/* bits, condition bits of the Benes network */
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/* rev, 0 for normal application; !0 for inverse */
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/* output: r, permuted bits */
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void PQCLEAN_MCELIECE348864F_VEC_benes(uint64_t *r, const unsigned char *bits, int rev) {
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int i;
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const unsigned char *cond_ptr;
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int inc, low;
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uint64_t cond[64];
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//
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if (rev == 0) {
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inc = 256;
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cond_ptr = bits;
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} else {
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inc = -256;
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cond_ptr = bits + (2 * GFBITS - 2) * 256;
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}
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//
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PQCLEAN_MCELIECE348864F_VEC_transpose_64x64(r, r);
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for (low = 0; low <= 5; low++) {
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for (i = 0; i < 64; i++) {
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cond[i] = PQCLEAN_MCELIECE348864F_VEC_load4(cond_ptr + i * 4);
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}
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PQCLEAN_MCELIECE348864F_VEC_transpose_64x64(cond, cond);
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layer(r, cond, low);
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cond_ptr += inc;
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}
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PQCLEAN_MCELIECE348864F_VEC_transpose_64x64(r, r);
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for (low = 0; low <= 5; low++) {
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for (i = 0; i < 32; i++) {
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cond[i] = PQCLEAN_MCELIECE348864F_VEC_load8(cond_ptr + i * 8);
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}
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layer(r, cond, low);
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cond_ptr += inc;
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}
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for (low = 4; low >= 0; low--) {
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for (i = 0; i < 32; i++) {
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cond[i] = PQCLEAN_MCELIECE348864F_VEC_load8(cond_ptr + i * 8);
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}
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layer(r, cond, low);
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cond_ptr += inc;
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}
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PQCLEAN_MCELIECE348864F_VEC_transpose_64x64(r, r);
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for (low = 5; low >= 0; low--) {
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for (i = 0; i < 64; i++) {
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cond[i] = PQCLEAN_MCELIECE348864F_VEC_load4(cond_ptr + i * 4);
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}
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PQCLEAN_MCELIECE348864F_VEC_transpose_64x64(cond, cond);
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layer(r, cond, low);
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cond_ptr += inc;
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}
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PQCLEAN_MCELIECE348864F_VEC_transpose_64x64(r, r);
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}
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