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Fix ext_xmss SigsLeft.

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jordan
2024-01-26 17:07:43 -06:00
parent 3db58af4f8
commit 947528ee16
1 changed files with 21 additions and 4 deletions
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25
wolfcrypt/src/ext_xmss.c
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@ -763,7 +763,7 @@ int wc_XmssKey_Sign(XmssKey* key, byte * sig, word32 * sigLen, const byte * msg,
*/ */
int wc_XmssKey_SigsLeft(XmssKey* key) int wc_XmssKey_SigsLeft(XmssKey* key)
{ {
int ret; int ret = 0;
/* Validate parameter. */ /* Validate parameter. */
if (key == NULL) { if (key == NULL) {
@ -785,13 +785,30 @@ int wc_XmssKey_SigsLeft(XmssKey* key)
ret = 0; ret = 0;
} }
else { else {
xmss_params* params = &key->params; /* The following assumes core_fast implementation is used
unsigned long long idx; * from patched xmss-reference. */
const unsigned char* sk = (key->sk + XMSS_OID_LEN);
const xmss_params* params = &key->params;
unsigned long long idx = 0;
if (key->is_xmssmt) {
for (uint64_t i = 0; i < params->index_bytes; i++) {
idx |= ((unsigned long long)sk[i])
<< 8 * (params->index_bytes - 1 - i);
}
}
else {
idx = ((unsigned long)sk[0] << 24) |
((unsigned long)sk[1] << 16) |
((unsigned long)sk[2] << 8) | sk[3];
}
idx = (unsigned long)bytes_to_ull(key->sk, params->index_bytes);
ret = idx < ((1ULL << params->full_height) - 1); ret = idx < ((1ULL << params->full_height) - 1);
} }
/* Force zero the secret key from memory always. */
ForceZero(key->sk, key->sk_len);
return ret; return ret;
} }
#endif /* ifndef WOLFSSL_XMSS_VERIFY_ONLY*/ #endif /* ifndef WOLFSSL_XMSS_VERIFY_ONLY*/