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Fix SPHINCS+ buffer overflow

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Zhi Guan
2026-05-27 09:48:46 +08:00
parent f08bedf9cd
commit 70a1f998ae
1 changed files with 8 additions and 1 deletions
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9
src/sphincs.c
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@@ -1552,13 +1552,20 @@ int sphincs_sign_finish_ex(SPHINCS_SIGN_CTX *ctx, SPHINCS_SIGNATURE *sig)
// tbs = H_msg(R, seed, root, M) = MGF1(R|seed|dgst, tbs_len) // tbs = H_msg(R, seed, root, M) = MGF1(R|seed|dgst, tbs_len)
for (i = 0; i < (SPHINCS_TBS_SIZE + 31)/32; i++) { for (i = 0; i < (SPHINCS_TBS_SIZE + 31)/32; i++) {
uint8_t count[4]; uint8_t count[4];
sphincs_hash256_t h_msg;
size_t left;
PUTU32(count, i); PUTU32(count, i);
sphincs_hash256_init(&ctx->hash_ctx); sphincs_hash256_init(&ctx->hash_ctx);
sphincs_hash256_update(&ctx->hash_ctx, ctx->sig.random, sizeof(sphincs_hash128_t)); sphincs_hash256_update(&ctx->hash_ctx, ctx->sig.random, sizeof(sphincs_hash128_t));
sphincs_hash256_update(&ctx->hash_ctx, ctx->key.public_key.seed, sizeof(sphincs_hash128_t)); sphincs_hash256_update(&ctx->hash_ctx, ctx->key.public_key.seed, sizeof(sphincs_hash128_t));
sphincs_hash256_update(&ctx->hash_ctx, dgst, sizeof(dgst)); sphincs_hash256_update(&ctx->hash_ctx, dgst, sizeof(dgst));
sphincs_hash256_update(&ctx->hash_ctx, count, sizeof(count)); sphincs_hash256_update(&ctx->hash_ctx, count, sizeof(count));
sphincs_hash256_finish(&ctx->hash_ctx, tbs + sizeof(dgst) * i); sphincs_hash256_finish(&ctx->hash_ctx, h_msg);
left = SPHINCS_TBS_SIZE - sizeof(dgst) * i;
left = left < sizeof(dgst) ? left : sizeof(dgst);
memcpy(tbs + sizeof(dgst) * i, h_msg, left);
} }
// get tree_address from tbs // get tree_address from tbs