diff options
Diffstat (limited to 'libtomcrypt/src/pk/dsa/dsa_make_key.c')
| -rw-r--r-- | libtomcrypt/src/pk/dsa/dsa_make_key.c | 69 |
1 files changed, 30 insertions, 39 deletions
diff --git a/libtomcrypt/src/pk/dsa/dsa_make_key.c b/libtomcrypt/src/pk/dsa/dsa_make_key.c index 02f69e0..293e814 100644 --- a/libtomcrypt/src/pk/dsa/dsa_make_key.c +++ b/libtomcrypt/src/pk/dsa/dsa_make_key.c @@ -6,7 +6,7 @@ * The library is free for all purposes without any express * guarantee it works. * - * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com */ #include "tomcrypt.h" @@ -28,11 +28,12 @@ */ int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, dsa_key *key) { - mp_int tmp, tmp2; + void *tmp, *tmp2; int err, res; unsigned char *buf; LTC_ARGCHK(key != NULL); + LTC_ARGCHK(ltc_mp.name != NULL); /* check prng */ if ((err = prng_is_valid(wprng)) != CRYPT_OK) { @@ -52,21 +53,21 @@ int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, } /* init mp_ints */ - if ((err = mp_init_multi(&tmp, &tmp2, &key->g, &key->q, &key->p, &key->x, &key->y, NULL)) != MP_OKAY) { - err = mpi_to_ltc_error(err); - goto LBL_ERR; + if ((err = mp_init_multi(&tmp, &tmp2, &key->g, &key->q, &key->p, &key->x, &key->y, NULL)) != CRYPT_OK) { + XFREE(buf); + return err; } /* make our prime q */ - if ((err = rand_prime(&key->q, group_size*8, prng, wprng)) != CRYPT_OK) { goto LBL_ERR; } + if ((err = rand_prime(key->q, group_size, prng, wprng)) != CRYPT_OK) { goto error; } /* double q */ - if ((err = mp_mul_2(&key->q, &tmp)) != MP_OKAY) { goto error; } + if ((err = mp_add(key->q, key->q, tmp)) != CRYPT_OK) { goto error; } /* now make a random string and multply it against q */ if (prng_descriptor[wprng].read(buf+1, modulus_size - group_size, prng) != (unsigned long)(modulus_size - group_size)) { err = CRYPT_ERROR_READPRNG; - goto LBL_ERR; + goto error; } /* force magnitude */ @@ -75,30 +76,30 @@ int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, /* force even */ buf[modulus_size - group_size - 1] &= ~1; - if ((err = mp_read_unsigned_bin(&tmp2, buf, modulus_size - group_size)) != MP_OKAY) { goto error; } - if ((err = mp_mul(&key->q, &tmp2, &key->p)) != MP_OKAY) { goto error; } - if ((err = mp_add_d(&key->p, 1, &key->p)) != MP_OKAY) { goto error; } + if ((err = mp_read_unsigned_bin(tmp2, buf, modulus_size - group_size)) != CRYPT_OK) { goto error; } + if ((err = mp_mul(key->q, tmp2, key->p)) != CRYPT_OK) { goto error; } + if ((err = mp_add_d(key->p, 1, key->p)) != CRYPT_OK) { goto error; } /* now loop until p is prime */ for (;;) { - if ((err = is_prime(&key->p, &res)) != CRYPT_OK) { goto LBL_ERR; } - if (res == MP_YES) break; + if ((err = mp_prime_is_prime(key->p, 8, &res)) != CRYPT_OK) { goto error; } + if (res == LTC_MP_YES) break; /* add 2q to p and 2 to tmp2 */ - if ((err = mp_add(&tmp, &key->p, &key->p)) != MP_OKAY) { goto error; } - if ((err = mp_add_d(&tmp2, 2, &tmp2)) != MP_OKAY) { goto error; } + if ((err = mp_add(tmp, key->p, key->p)) != CRYPT_OK) { goto error; } + if ((err = mp_add_d(tmp2, 2, tmp2)) != CRYPT_OK) { goto error; } } /* now p = (q * tmp2) + 1 is prime, find a value g for which g^tmp2 != 1 */ - mp_set(&key->g, 1); + mp_set(key->g, 1); do { - if ((err = mp_add_d(&key->g, 1, &key->g)) != MP_OKAY) { goto error; } - if ((err = mp_exptmod(&key->g, &tmp2, &key->p, &tmp)) != MP_OKAY) { goto error; } - } while (mp_cmp_d(&tmp, 1) == MP_EQ); + if ((err = mp_add_d(key->g, 1, key->g)) != CRYPT_OK) { goto error; } + if ((err = mp_exptmod(key->g, tmp2, key->p, tmp)) != CRYPT_OK) { goto error; } + } while (mp_cmp_d(tmp, 1) == LTC_MP_EQ); /* at this point tmp generates a group of order q mod p */ - mp_exch(&tmp, &key->g); + mp_exch(tmp, key->g); /* so now we have our DH structure, generator g, order q, modulus p Now we need a random exponent [mod q] and it's power g^x mod p @@ -106,22 +107,15 @@ int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, do { if (prng_descriptor[wprng].read(buf, group_size, prng) != (unsigned long)group_size) { err = CRYPT_ERROR_READPRNG; - goto LBL_ERR; + goto error; } - if ((err = mp_read_unsigned_bin(&key->x, buf, group_size)) != MP_OKAY) { goto error; } - } while (mp_cmp_d(&key->x, 1) != MP_GT); - if ((err = mp_exptmod(&key->g, &key->x, &key->p, &key->y)) != MP_OKAY) { goto error; } - + if ((err = mp_read_unsigned_bin(key->x, buf, group_size)) != CRYPT_OK) { goto error; } + } while (mp_cmp_d(key->x, 1) != LTC_MP_GT); + if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { goto error; } + key->type = PK_PRIVATE; key->qord = group_size; - /* shrink the ram required */ - if ((err = mp_shrink(&key->g)) != MP_OKAY) { goto error; } - if ((err = mp_shrink(&key->p)) != MP_OKAY) { goto error; } - if ((err = mp_shrink(&key->q)) != MP_OKAY) { goto error; } - if ((err = mp_shrink(&key->x)) != MP_OKAY) { goto error; } - if ((err = mp_shrink(&key->y)) != MP_OKAY) { goto error; } - #ifdef LTC_CLEAN_STACK zeromem(buf, MDSA_DELTA); #endif @@ -129,12 +123,9 @@ int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, err = CRYPT_OK; goto done; error: - err = mpi_to_ltc_error(err); -LBL_ERR: - mp_clear_multi(&key->g, &key->q, &key->p, &key->x, &key->y, NULL); + mp_clear_multi(key->g, key->q, key->p, key->x, key->y, NULL); done: - mp_clear_multi(&tmp, &tmp2, NULL); - + mp_clear_multi(tmp, tmp2, NULL); XFREE(buf); return err; } @@ -142,5 +133,5 @@ done: #endif /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_make_key.c,v $ */ -/* $Revision: 1.4 $ */ -/* $Date: 2005/06/11 05:45:35 $ */ +/* $Revision: 1.10 $ */ +/* $Date: 2006/12/04 03:18:43 $ */ |