Mercurial > dropbear
diff gendss.c @ 188:c9483550701b
- refactored random mp_int generation and byte->mp_int code
- added RSA blinding
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 05 May 2005 03:58:21 +0000 |
parents | 6571b480fa04 |
children | 740e782679be b50f0107e505 76097ec1a29a |
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--- a/gendss.c Wed May 04 15:31:17 2005 +0000 +++ b/gendss.c Thu May 05 03:58:21 2005 +0000 @@ -77,10 +77,7 @@ buf[0] |= 0x80; /* top bit high */ buf[QSIZE-1] |= 0x01; /* bottom bit high */ - if (mp_read_unsigned_bin(key->q, buf, QSIZE) != MP_OKAY) { - fprintf(stderr, "dss key generation failed\n"); - exit(1); - } + bytes_to_mp(key->q, buf, QSIZE); /* 18 rounds are required according to HAC */ if (mp_prime_next_prime(key->q, 18, 0) != MP_OKAY) { @@ -116,10 +113,7 @@ buf[0] |= 0x80; /* set the top bit high */ /* X is a random mp_int */ - if (mp_read_unsigned_bin(&tempX, buf, size) != MP_OKAY) { - fprintf(stderr, "dss key generation failed\n"); - exit(1); - } + bytes_to_mp(&tempX, buf, size); /* C = X mod 2q */ if (mp_mod(&tempX, &temp2q, &tempC) != MP_OKAY) { @@ -147,6 +141,7 @@ } while (!result); mp_clear_multi(&tempX, &tempC, &tempP, &temp2q, NULL); + m_burn(buf, size); m_free(buf); } @@ -189,22 +184,7 @@ static void getx(dss_key *key) { - DEF_MP_INT(val); - char buf[QSIZE]; - - m_mp_init(&val); - - do { - genrandom(buf, QSIZE); - - if (mp_read_unsigned_bin(&val, buf, QSIZE) != MP_OKAY) { - fprintf(stderr, "dss key generation failed\n"); - } - } while ((mp_cmp_d(&val, 1) == MP_GT) && (mp_cmp(&val, key->q) == MP_LT)); - - mp_copy(&val, key->x); - mp_clear(&val); - + gen_random_mpint(key->q, key->x); } static void gety(dss_key *key) {