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Merge pull request #7167 from SparkiDev/rsa_dec_check_d

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RSA Decryption: check private value after decryption
This commit is contained in:
David Garske
2024-01-29 14:01:27 -08:00
committed by GitHub
parent a6326bd80a 999f84518c
commit de4a6f9e00
1 changed files with 11 additions and 0 deletions
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11
wolfcrypt/src/rsa.c
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@@ -2723,6 +2723,17 @@ static int RsaFunctionSync(const byte* in, word32 inLen, byte* out,
if (mp_to_unsigned_bin_len_ct(tmp, out, (int)*outLen) != MP_OKAY)
ret = MP_TO_E;
}
#ifdef WOLFSSL_RSA_CHECK_D_ON_DECRYPT
if ((ret == 0) && (type == RSA_PRIVATE_DECRYPT)) {
mp_sub(&key->n, &key->p, tmp);
mp_sub(tmp, &key->q, tmp);
mp_add_d(tmp, 1, tmp);
mp_mulmod(&key->d, &key->e, tmp, tmp);
if (!mp_isone(tmp)) {
ret = MP_EXPTMOD_E;
}
}
#endif
#else
(void)type;
(void)key;