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PR70 fix

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liquidraver
2026-08-20 21:13:15 +02:00
parent 1263211099
commit 9fc3ab7f7e
6 changed files with 192 additions and 10 deletions
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zephcore/src/Identity.cpp
+59
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@@ -199,6 +199,65 @@ size_t LocalIdentity::writeTo(uint8_t *dest, size_t max_len) const
return PRV_KEY_SIZE + PUB_KEY_SIZE;
}
size_t LocalIdentity::writeToStorage(uint8_t *dest, size_t max_len) const
{
if (max_len < PUB_KEY_SIZE + PRV_KEY_SIZE) return 0;
memcpy(dest, pub_key, PUB_KEY_SIZE);
memcpy(dest + PUB_KEY_SIZE, prv_key, PRV_KEY_SIZE);
return PUB_KEY_SIZE + PRV_KEY_SIZE;
}
bool LocalIdentity::readFromStorage(const uint8_t *src, size_t len)
{
uint8_t derived[PUB_KEY_SIZE];
/* prv alone — nothing to disagree with, derive and go. */
if (len == PRV_KEY_SIZE) {
memcpy(prv_key, src, PRV_KEY_SIZE);
crypto_eddsa_scalarbase(pub_key, prv_key);
return true;
}
if (len != PUB_KEY_SIZE + PRV_KEY_SIZE) return false;
/* Canonical: pub || prv. */
crypto_eddsa_scalarbase(derived, src + PUB_KEY_SIZE);
if (memcmp(derived, src, PUB_KEY_SIZE) == 0) {
memcpy(prv_key, src + PUB_KEY_SIZE, PRV_KEY_SIZE);
memcpy(pub_key, derived, PUB_KEY_SIZE);
return true;
}
/* Legacy ZephCore companion: prv || pub. */
crypto_eddsa_scalarbase(derived, src);
if (memcmp(derived, src + PRV_KEY_SIZE, PUB_KEY_SIZE) == 0) {
memcpy(prv_key, src, PRV_KEY_SIZE);
memcpy(pub_key, derived, PUB_KEY_SIZE);
return true;
}
return false;
}
bool LocalIdentity::recoverFromStorage(const uint8_t *src, size_t len)
{
if (len != PUB_KEY_SIZE + PRV_KEY_SIZE) return false;
/* Where the prv would sit under each layout. */
const uint8_t *cand[2] = { src + PUB_KEY_SIZE, src }; /* pub||prv, prv||pub */
int found = -1;
for (int i = 0; i < 2; i++) {
if (!validatePrivateKey(cand[i])) continue;
if (found >= 0) return false; /* both plausible — refuse to guess */
found = i;
}
if (found < 0) return false;
memcpy(prv_key, cand[found], PRV_KEY_SIZE);
crypto_eddsa_scalarbase(pub_key, prv_key);
return true;
}
void LocalIdentity::sign(uint8_t *sig, const uint8_t *message, int msg_len) const
{
signExpanded(sig, prv_key, pub_key, message, (size_t)msg_len);