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RSA in CRT optimization parameters are empty

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Pascal Brand 2014-09-18 20:45:42 +02:00 committed by Steffen Jaeckel
parent 2bb3f0246f
commit a6e89d58d4
1 changed files with 3 additions and 8 deletions
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11
src/pk/rsa/rsa_exptmod.c
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@ -100,16 +100,11 @@ int rsa_exptmod(const unsigned char *in, unsigned long inlen,
}
#endif /* LTC_RSA_BLINDING */
if (key->dP == NULL) {
if ((key->dP == NULL) || (mp_get_digit_count(key->dP) == 0)) {
/*
* In case CRT optimization parameters are provided,
* the private key is directly used
* In case CRT optimization parameters are not provided,
* the private key is directly used to exptmod it
*/
LTC_ARGCHK(key->dQ == NULL);
LTC_ARGCHK(key->qP == NULL);
LTC_ARGCHK(key->p == NULL);
LTC_ARGCHK(key->q == NULL);
/* exptmod it */
if ((err = mp_exptmod(tmp, key->d, key->N, tmp)) != CRYPT_OK) { goto error; }
} else {
/* tmpa = tmp^dP mod p */