From c8bac936d2e72629cf2b68a3224e26b6b394ceb1 Mon Sep 17 00:00:00 2001 From: Matt Johnston Date: Thu, 5 May 2005 03:58:21 +0000 Subject: - refactored random mp_int generation and byte->mp_int code - added RSA blinding --- gendss.c | 28 ++++------------------------ 1 file changed, 4 insertions(+), 24 deletions(-) (limited to 'gendss.c') diff --git a/gendss.c b/gendss.c index d589722..bf46d3d 100644 --- a/gendss.c +++ b/gendss.c @@ -77,10 +77,7 @@ static void getq(dss_key *key) { 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 @@ static void getp(dss_key *key, unsigned int size) { 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 @@ static void getp(dss_key *key, unsigned int size) { } while (!result); mp_clear_multi(&tempX, &tempC, &tempP, &temp2q, NULL); + m_burn(buf, size); m_free(buf); } @@ -189,22 +184,7 @@ static void getg(dss_key * key) { 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) { -- cgit v1.2.1