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First commit, Vystem v0.1

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lolo859
2026-03-31 22:15:00 +02:00
commit e15daed8c0
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74
Blastproof/keygen/thash_sha2_robust.c Normal file
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#include <stdint.h>
#include <string.h>
#include "thash.h"
#include "address.h"
#include "params.h"
#include "utils.h"
#include "sha2.h"
#if SPX_SHA512
static void thash_512(unsigned char *out, const unsigned char *in, unsigned int inblocks,
const spx_ctx *ctx, uint32_t addr[8]);
#endif
/**
* Takes an array of inblocks concatenated arrays of SPX_N bytes.
*/
void thash(unsigned char *out, const unsigned char *in, unsigned int inblocks,
const spx_ctx *ctx, uint32_t addr[8])
{
#if SPX_SHA512
if (inblocks > 1) {
thash_512(out, in, inblocks, ctx, addr);
return;
}
#endif
unsigned char outbuf[SPX_SHA256_OUTPUT_BYTES];
SPX_VLA(uint8_t, bitmask, inblocks * SPX_N);
SPX_VLA(uint8_t, buf, SPX_N + SPX_SHA256_OUTPUT_BYTES + inblocks*SPX_N);
uint8_t sha2_state[40];
unsigned int i;
memcpy(buf, ctx->pub_seed, SPX_N);
memcpy(buf + SPX_N, addr, SPX_SHA256_ADDR_BYTES);
mgf1_256(bitmask, inblocks * SPX_N, buf, SPX_N + SPX_SHA256_ADDR_BYTES);
/* Retrieve precomputed state containing pub_seed */
memcpy(sha2_state, ctx->state_seeded, 40 * sizeof(uint8_t));
for (i = 0; i < inblocks * SPX_N; i++) {
buf[SPX_N + SPX_SHA256_ADDR_BYTES + i] = in[i] ^ bitmask[i];
}
sha256_inc_finalize(outbuf, sha2_state, buf + SPX_N,
SPX_SHA256_ADDR_BYTES + inblocks*SPX_N);
memcpy(out, outbuf, SPX_N);
}
#if SPX_SHA512
static void thash_512(unsigned char *out, const unsigned char *in, unsigned int inblocks,
const spx_ctx *ctx, uint32_t addr[8])
{
unsigned char outbuf[SPX_SHA512_OUTPUT_BYTES];
SPX_VLA(uint8_t, bitmask, inblocks * SPX_N);
SPX_VLA(uint8_t, buf, SPX_N + SPX_SHA256_ADDR_BYTES + inblocks*SPX_N);
uint8_t sha2_state[72];
unsigned int i;
memcpy(buf, ctx->pub_seed, SPX_N);
memcpy(buf + SPX_N, addr, SPX_SHA256_ADDR_BYTES);
mgf1_512(bitmask, inblocks * SPX_N, buf, SPX_N + SPX_SHA256_ADDR_BYTES);
/* Retrieve precomputed state containing pub_seed */
memcpy(sha2_state, ctx->state_seeded_512, 72 * sizeof(uint8_t));
for (i = 0; i < inblocks * SPX_N; i++) {
buf[SPX_N + SPX_SHA256_ADDR_BYTES + i] = in[i] ^ bitmask[i];
}
sha512_inc_finalize(outbuf, sha2_state, buf + SPX_N,
SPX_SHA256_ADDR_BYTES + inblocks*SPX_N);
memcpy(out, outbuf, SPX_N);
}
#endif