mirror of
https://github.com/henrydcase/pqc.git
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78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
#include <stdint.h>
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#include <string.h>
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#include "address.h"
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#include "params.h"
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#include "thash.h"
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#include "sha2.h"
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#include "sha256.h"
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/**
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* Takes an array of inblocks concatenated arrays of SPX_N bytes.
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*/
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static void PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash(
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unsigned char *out, unsigned char *buf,
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const unsigned char *in, unsigned int inblocks,
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const unsigned char *pub_seed, uint32_t addr[8]) {
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unsigned char outbuf[SPX_SHA256_OUTPUT_BYTES];
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unsigned char *bitmask = buf + SPX_N + SPX_SHA256_ADDR_BYTES + 4;
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uint8_t sha2_state[40];
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unsigned int i;
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memcpy(buf, pub_seed, SPX_N);
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PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_compress_address(buf + SPX_N, addr);
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/* MGF1 requires us to have 4 extra bytes in 'buf' */
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PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_mgf1(bitmask, inblocks * SPX_N, buf, SPX_N + SPX_SHA256_ADDR_BYTES);
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/* Retrieve precomputed state containing pub_seed */
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memcpy(sha2_state, PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_state_seeded, 40 * sizeof(uint8_t));
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for (i = 0; i < inblocks * SPX_N; i++) {
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buf[SPX_N + SPX_SHA256_ADDR_BYTES + i] = in[i] ^ bitmask[i];
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}
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sha256_inc_finalize(outbuf, sha2_state, buf + SPX_N,
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SPX_SHA256_ADDR_BYTES + inblocks * SPX_N);
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memcpy(out, outbuf, SPX_N);
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}
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/* The wrappers below ensure that we use fixed-size buffers on the stack */
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void PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash_1(
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unsigned char *out, const unsigned char *in,
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const unsigned char *pub_seed, uint32_t addr[8]) {
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unsigned char buf[SPX_N + SPX_SHA256_ADDR_BYTES + 4 + 1 * SPX_N];
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PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash(
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out, buf, in, 1, pub_seed, addr);
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}
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void PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash_2(
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unsigned char *out, const unsigned char *in,
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const unsigned char *pub_seed, uint32_t addr[8]) {
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unsigned char buf[SPX_N + SPX_SHA256_ADDR_BYTES + 4 + 2 * SPX_N];
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PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash(
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out, buf, in, 2, pub_seed, addr);
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}
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void PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash_WOTS_LEN(
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unsigned char *out, const unsigned char *in,
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const unsigned char *pub_seed, uint32_t addr[8]) {
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unsigned char buf[SPX_N + SPX_SHA256_ADDR_BYTES + 4 + SPX_WOTS_LEN * SPX_N];
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PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash(
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out, buf, in, SPX_WOTS_LEN, pub_seed, addr);
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}
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void PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash_FORS_TREES(
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unsigned char *out, const unsigned char *in,
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const unsigned char *pub_seed, uint32_t addr[8]) {
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unsigned char buf[SPX_N + SPX_SHA256_ADDR_BYTES + 4 + SPX_FORS_TREES * SPX_N];
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PQCLEAN_SPHINCSSHA256256SROBUST_CLEAN_thash(
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out, buf, in, SPX_FORS_TREES, pub_seed, addr);
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}
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