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ECC import priv: validate priv is less than order

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Valid private key must be less than order.
Check on import when WOLFSSL_VALIDATE_ECC_IMPORT defined.
This commit is contained in:
Sean Parkinson 2022-07-27 09:29:07 +10:00
parent 5f47adba3c
commit 9ac3c9ec05
1 changed files with 30 additions and 0 deletions
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30
wolfcrypt/src/ecc.c
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@ -9939,6 +9939,36 @@ int wc_ecc_import_private_key_ex(const byte* priv, word32 privSz,
ret = ASN_GETINT_E;
}
#endif /* HAVE_WOLF_BIGINT */
#ifdef WOLFSSL_VALIDATE_ECC_IMPORT
if (ret == 0) {
#ifdef WOLFSSL_SMALL_STACK
mp_int* order = NULL;
#else
mp_int order[1];
#endif
#ifdef WOLFSSL_SMALL_STACK
order = (mp_int*)XMALLOC(sizeof(mp_int), key->heap, DYNAMIC_TYPE_ECC);
if (order == NULL) {
ret = MEMORY_E;
}
#endif
if (ret == 0) {
ret = mp_init(order);
}
if (ret == 0) {
ret = mp_read_radix(order, key->dp->order, MP_RADIX_HEX);
}
if ((ret == 0) && (mp_cmp(&key->k, order) != MP_LT)) {
ret = ECC_PRIV_KEY_E;
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(order, key->heap, DYNAMIC_TYPE_ECC);
#endif
}
#endif /* WOLFSSL_VALIDATE_ECC_IMPORT */
#endif /* WOLFSSL_CRYPTOCELL */