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dsa_encrypt_key small correction

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This commit is contained in:
Karel Miko 2014-01-19 23:13:20 +01:00 committed by Steffen Jaeckel
parent 655336f0cb
commit a43bb0fda6
1 changed files with 10 additions and 13 deletions
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23
src/pk/dsa/dsa_encrypt_key.c
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@ -37,7 +37,7 @@ int dsa_encrypt_key(const unsigned char *in, unsigned long inlen,
unsigned char *expt, *skey;
void *g_pub, *g_priv;
unsigned long x, y;
int err;
int err, qbits;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
@ -75,18 +75,15 @@ int dsa_encrypt_key(const unsigned char *in, unsigned long inlen,
return CRYPT_MEM;
}
/* make a random x, g^x pair */
x = mp_unsigned_bin_size(key->q);
if (prng_descriptor[wprng].read(expt, x, prng) != x) {
err = CRYPT_ERROR_READPRNG;
goto LBL_ERR;
}
/* load x */
if ((err = mp_read_unsigned_bin(g_priv, expt, x)) != CRYPT_OK) {
goto LBL_ERR;
}
/* make a random g_priv, g_pub = g^x pair */
qbits = mp_count_bits(key->q);
do {
if ((err = rand_bn_bits(g_priv, qbits, prng, wprng)) != CRYPT_OK) {
goto LBL_ERR;
}
/* private key x should be from range: 1 <= x <= q-1 (see FIPS 186-4 B.1.2) */
} while (mp_cmp_d(g_priv, 0) != LTC_MP_GT || mp_cmp(g_priv, key->q) != LTC_MP_LT);
/* compute y */
if ((err = mp_exptmod(key->g, g_priv, key->p, g_pub)) != CRYPT_OK) {
goto LBL_ERR;