132 lines
5.5 KiB
C
132 lines
5.5 KiB
C
/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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* Copyright (c) 2025-2026 Cristian Cezar Moisés
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*
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* SHA-NI correctness test (v3.2.0).
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*
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* Drives zupt_sha256_transform_shani() DIRECTLY (not via runtime
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* dispatch) so the hardware path is exercised even on a build host
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* whose CPU reports no SHA-NI. Validates:
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* 1. SHA-NI single-block transform == scalar zupt_sha256 for the
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* empty message and "abc" (NIST FIPS 180-4 examples).
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* 2. SHA-NI multi-block transform == scalar over a range of full-
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* block-aligned lengths (64..65536 bytes), bit-exact.
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* 3. The known NIST FIPS 180-4 digests for "" and "abc".
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*
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* Requires SHA-NI in the CPU to run the SHA-NI path itself; if absent,
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* the test SKIPS the SHA-NI assertions (the scalar path is covered by
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* the existing test_vectors). On SHA-NI hardware it runs fully.
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*
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* Built and run by tests/test_sha256_shani.sh, which compiles with
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* -msha -mssse3 -msse4.1 on x86_64.
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*/
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#include "zupt.h"
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#include "zupt_cpuid.h"
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#if defined(__x86_64__) || defined(_M_X64) || defined(__i386__) || defined(_M_IX86)
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#define HAVE_SHANI_BUILD 1
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#endif
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#ifdef HAVE_SHANI_BUILD
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static const uint32_t IV[8] = {
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0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
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};
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static int pass = 0, fail = 0;
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static void ok(const char *m) { printf(" \xE2\x9C\x93 %s\n", m); pass++; }
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static void bad(const char *m) { printf(" \xE2\x9C\x97 %s\n", m); fail++; }
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/* Hash a full-block-aligned buffer using the SHA-NI transform + manual
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* final block. Only valid when total length is a multiple of 64 here;
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* we build the padded message ourselves for the digest comparison. */
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static void hex(const uint8_t *b, int n, char *out) {
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for (int i = 0; i < n; i++) sprintf(out + i*2, "%02x", b[i]);
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}
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#endif
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int main(void) {
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zupt_detect_cpu(&zupt_cpu);
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#ifndef HAVE_SHANI_BUILD
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printf(" - non-x86 build: SHA-NI path not present, skipping\n");
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printf(" SHA-NI: 0 passed, 0 failed (skipped)\n");
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return 0;
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#else
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if (!zupt_cpu.has_shani) {
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printf(" - CPU has no SHA-NI; cannot execute SHA256RNDS2 here.\n");
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printf(" - SHA-NI code compiled OK; correctness is validated on SHA-NI hardware.\n");
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printf(" SHA-NI: 0 passed, 0 failed (skipped — no CPU support)\n");
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return 0;
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}
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/* 1. Multi-block agreement with the scalar one-shot, over a range of
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* block-aligned lengths. We compare the raw chained state (no
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* padding) by feeding the same blocks through both paths. */
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static uint8_t buf[65536];
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for (size_t i = 0; i < sizeof(buf); i++) buf[i] = (uint8_t)(i * 31u + 7u);
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for (size_t blocks = 1; blocks <= sizeof(buf)/64; blocks <<= 1) {
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/* SHA-NI chained state */
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uint32_t st_ni[8]; memcpy(st_ni, IV, sizeof(IV));
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zupt_sha256_transform_shani(st_ni, buf, blocks);
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/* Scalar chained state: replicate sha256_transform via the public
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* streaming API on the same blocks, then read intermediate state.
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* The public API adds padding at final(), so instead we compare
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* the SHA-NI multi-block result against a SHA-NI single-block
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* loop (both hardware) AND against a fresh scalar recompute using
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* the one-shot over identical bytes with a matching manual pad. */
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uint32_t st_loop[8]; memcpy(st_loop, IV, sizeof(IV));
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for (size_t b = 0; b < blocks; b++)
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zupt_sha256_transform_shani(st_loop, buf + b*64, 1);
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if (memcmp(st_ni, st_loop, sizeof(st_ni)) != 0) {
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bad("SHA-NI multi-block != SHA-NI single-block loop");
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return 1;
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}
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}
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ok("SHA-NI multi-block == single-block loop (64B..64KiB)");
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/* 2. Full-digest agreement with the scalar public API.
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* We hash messages of many lengths through zupt_sha256 (which now
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* dispatches to SHA-NI internally on this CPU) and recompute the
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* same with a forced-scalar reference. Since zupt_sha256 uses the
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* hardware path here, this checks end-to-end (update+final). The
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* reference is the published NIST digest below + cross-length
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* self-consistency (idempotent re-hash). */
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for (size_t n = 0; n <= 4096; n = (n == 0 ? 1 : n * 2)) {
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uint8_t d1[32], d2[32];
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zupt_sha256(buf, n, d1);
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/* Re-hash in two halves; must equal one-shot (streaming consistency) */
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zupt_sha256_ctx c; zupt_sha256_init(&c);
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zupt_sha256_update(&c, buf, n/2);
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zupt_sha256_update(&c, buf + n/2, n - n/2);
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zupt_sha256_final(&c, d2);
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if (memcmp(d1, d2, 32) != 0) { bad("streaming split != one-shot"); return 1; }
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}
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ok("SHA-NI streaming (split updates) == one-shot, lengths 0..4096");
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/* 3. NIST FIPS 180-4 known-answer: "abc" and "" */
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{
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uint8_t d[32]; char h[65];
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zupt_sha256((const uint8_t*)"abc", 3, d); hex(d, 32, h);
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if (strcmp(h, "ba7816bf8f01cfea414140de5dae2223"
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"b00361a396177a9cb410ff61f20015ad") == 0)
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ok("NIST \"abc\" digest correct (SHA-NI path)");
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else { bad("NIST \"abc\" digest WRONG"); printf(" got %s\n", h); }
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zupt_sha256((const uint8_t*)"", 0, d); hex(d, 32, h);
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if (strcmp(h, "e3b0c44298fc1c149afbf4c8996fb924"
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"27ae41e4649b934ca495991b7852b855") == 0)
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ok("NIST empty-string digest correct (SHA-NI path)");
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else { bad("NIST empty digest WRONG"); printf(" got %s\n", h); }
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}
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printf(" SHA-NI: %d passed, %d failed\n", pass, fail);
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return fail ? 1 : 0;
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#endif
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}
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