TeaSpeak/tomcrypt
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make implementation easier to read

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damn you negated logic...
This commit is contained in:
Steffen Jaeckel 2017-02-15 23:15:43 +01:00
parent f784793891
commit 8fc1af1b7e
1 changed files with 6 additions and 4 deletions
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10
src/pk/rsa/rsa_exptmod.c
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@ -38,7 +38,7 @@ int rsa_exptmod(const unsigned char *in, unsigned long inlen,
void *rnd, *rndi /* inverse of rnd */; void *rnd, *rndi /* inverse of rnd */;
#endif #endif
unsigned long x; unsigned long x;
int err, no_crt; int err, has_crt_parameters;
LTC_ARGCHK(in != NULL); LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL); LTC_ARGCHK(out != NULL);
@ -100,9 +100,11 @@ int rsa_exptmod(const unsigned char *in, unsigned long inlen,
} }
#endif /* LTC_RSA_BLINDING */ #endif /* LTC_RSA_BLINDING */
no_crt = (key->dP == NULL) || (mp_get_digit_count(key->dP) == 0); has_crt_parameters = (key->dP != NULL) && (mp_get_digit_count(key->dP) != 0) &&
(key->dQ != NULL) && (mp_get_digit_count(key->dQ) != 0) &&
(key->qP != NULL) && (mp_get_digit_count(key->qP) != 0);
if (no_crt) { if (!has_crt_parameters) {
/* /*
* In case CRT optimization parameters are not provided, * In case CRT optimization parameters are not provided,
* the private key is directly used to exptmod it * the private key is directly used to exptmod it
@ -133,7 +135,7 @@ int rsa_exptmod(const unsigned char *in, unsigned long inlen,
#endif #endif
#ifdef LTC_RSA_CRT_HARDENING #ifdef LTC_RSA_CRT_HARDENING
if (!no_crt) { if (has_crt_parameters) {
if ((err = mp_exptmod(tmp, key->e, key->N, tmpa)) != CRYPT_OK) { goto error; } if ((err = mp_exptmod(tmp, key->e, key->N, tmpa)) != CRYPT_OK) { goto error; }
if ((err = mp_read_unsigned_bin(tmpb, (unsigned char *)in, (int)inlen)) != CRYPT_OK) { goto error; } if ((err = mp_read_unsigned_bin(tmpb, (unsigned char *)in, (int)inlen)) != CRYPT_OK) { goto error; }
if (mp_cmp(tmpa, tmpb) != LTC_MP_EQ) { err = CRYPT_ERROR; goto error; } if (mp_cmp(tmpa, tmpb) != LTC_MP_EQ) { err = CRYPT_ERROR; goto error; }