diff options
Diffstat (limited to 'libtomcrypt/src/pk/rsa/rsa_make_key.c')
| -rw-r--r-- | libtomcrypt/src/pk/rsa/rsa_make_key.c | 89 |
1 files changed, 38 insertions, 51 deletions
diff --git a/libtomcrypt/src/pk/rsa/rsa_make_key.c b/libtomcrypt/src/pk/rsa/rsa_make_key.c index d874106..bd2a29b 100644 --- a/libtomcrypt/src/pk/rsa/rsa_make_key.c +++ b/libtomcrypt/src/pk/rsa/rsa_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" @@ -28,10 +28,11 @@ */ int rsa_make_key(prng_state *prng, int wprng, int size, long e, rsa_key *key) { - mp_int p, q, tmp1, tmp2, tmp3; + void *p, *q, *tmp1, *tmp2, *tmp3; int err; - LTC_ARGCHK(key != NULL); + LTC_ARGCHK(ltc_mp.name != NULL); + LTC_ARGCHK(key != NULL); if ((size < (MIN_RSA_SIZE/8)) || (size > (MAX_RSA_SIZE/8))) { return CRYPT_INVALID_KEYSIZE; @@ -45,81 +46,67 @@ int rsa_make_key(prng_state *prng, int wprng, int size, long e, rsa_key *key) return err; } - if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, &tmp3, NULL)) != MP_OKAY) { - return mpi_to_ltc_error(err); + if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, &tmp3, NULL)) != CRYPT_OK) { + return err; } /* make primes p and q (optimization provided by Wayne Scott) */ - if ((err = mp_set_int(&tmp3, e)) != MP_OKAY) { goto error; } /* tmp3 = e */ + if ((err = mp_set_int(tmp3, e)) != CRYPT_OK) { goto errkey; } /* tmp3 = e */ /* make prime "p" */ do { - if ((err = rand_prime(&p, size*4, prng, wprng)) != CRYPT_OK) { goto done; } - if ((err = mp_sub_d(&p, 1, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = p-1 */ - if ((err = mp_gcd(&tmp1, &tmp3, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = gcd(p-1, e) */ - } while (mp_cmp_d(&tmp2, 1) != 0); /* while e divides p-1 */ + if ((err = rand_prime( p, size/2, prng, wprng)) != CRYPT_OK) { goto errkey; } + if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = p-1 */ + if ((err = mp_gcd( tmp1, tmp3, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = gcd(p-1, e) */ + } while (mp_cmp_d( tmp2, 1) != 0); /* while e divides p-1 */ /* make prime "q" */ do { - if ((err = rand_prime(&q, size*4, prng, wprng)) != CRYPT_OK) { goto done; } - if ((err = mp_sub_d(&q, 1, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = q-1 */ - if ((err = mp_gcd(&tmp1, &tmp3, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = gcd(q-1, e) */ - } while (mp_cmp_d(&tmp2, 1) != 0); /* while e divides q-1 */ + if ((err = rand_prime( q, size/2, prng, wprng)) != CRYPT_OK) { goto errkey; } + if ((err = mp_sub_d( q, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = q-1 */ + if ((err = mp_gcd( tmp1, tmp3, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = gcd(q-1, e) */ + } while (mp_cmp_d( tmp2, 1) != 0); /* while e divides q-1 */ /* tmp1 = lcm(p-1, q-1) */ - if ((err = mp_sub_d(&p, 1, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = p-1 */ - /* tmp1 = q-1 (previous do/while loop) */ - if ((err = mp_lcm(&tmp1, &tmp2, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = lcm(p-1, q-1) */ + if ((err = mp_sub_d( p, 1, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = p-1 */ + /* tmp1 = q-1 (previous do/while loop) */ + if ((err = mp_lcm( tmp1, tmp2, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = lcm(p-1, q-1) */ /* make key */ - if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, - &key->qP, &key->p, &key->q, NULL)) != MP_OKAY) { - goto error; + if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) { + goto errkey; } - if ((err = mp_set_int(&key->e, e)) != MP_OKAY) { goto error2; } /* key->e = e */ - if ((err = mp_invmod(&key->e, &tmp1, &key->d)) != MP_OKAY) { goto error2; } /* key->d = 1/e mod lcm(p-1,q-1) */ - if ((err = mp_mul(&p, &q, &key->N)) != MP_OKAY) { goto error2; } /* key->N = pq */ + if ((err = mp_set_int( key->e, e)) != CRYPT_OK) { goto errkey; } /* key->e = e */ + if ((err = mp_invmod( key->e, tmp1, key->d)) != CRYPT_OK) { goto errkey; } /* key->d = 1/e mod lcm(p-1,q-1) */ + if ((err = mp_mul( p, q, key->N)) != CRYPT_OK) { goto errkey; } /* key->N = pq */ /* optimize for CRT now */ /* find d mod q-1 and d mod p-1 */ - if ((err = mp_sub_d(&p, 1, &tmp1)) != MP_OKAY) { goto error2; } /* tmp1 = q-1 */ - if ((err = mp_sub_d(&q, 1, &tmp2)) != MP_OKAY) { goto error2; } /* tmp2 = p-1 */ - if ((err = mp_mod(&key->d, &tmp1, &key->dP)) != MP_OKAY) { goto error2; } /* dP = d mod p-1 */ - if ((err = mp_mod(&key->d, &tmp2, &key->dQ)) != MP_OKAY) { goto error2; } /* dQ = d mod q-1 */ - if ((err = mp_invmod(&q, &p, &key->qP)) != MP_OKAY) { goto error2; } /* qP = 1/q mod p */ - - if ((err = mp_copy(&p, &key->p)) != MP_OKAY) { goto error2; } - if ((err = mp_copy(&q, &key->q)) != MP_OKAY) { goto error2; } - - /* shrink ram required */ - if ((err = mp_shrink(&key->e)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->d)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->N)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->dQ)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->dP)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->qP)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->p)) != MP_OKAY) { goto error2; } - if ((err = mp_shrink(&key->q)) != MP_OKAY) { goto error2; } + if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = q-1 */ + if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = p-1 */ + if ((err = mp_mod( key->d, tmp1, key->dP)) != CRYPT_OK) { goto errkey; } /* dP = d mod p-1 */ + if ((err = mp_mod( key->d, tmp2, key->dQ)) != CRYPT_OK) { goto errkey; } /* dQ = d mod q-1 */ + if ((err = mp_invmod( q, p, key->qP)) != CRYPT_OK) { goto errkey; } /* qP = 1/q mod p */ + + if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto errkey; } + if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto errkey; } /* set key type (in this case it's CRT optimized) */ key->type = PK_PRIVATE; /* return ok and free temps */ err = CRYPT_OK; - goto done; -error2: - mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP, - &key->qP, &key->p, &key->q, NULL); -error: - err = mpi_to_ltc_error(err); -done: - mp_clear_multi(&tmp3, &tmp2, &tmp1, &p, &q, NULL); + goto cleanup; +errkey: + mp_clear_multi(key->d, key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL); +cleanup: + mp_clear_multi(tmp3, tmp2, tmp1, p, q, NULL); return err; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_make_key.c,v $ */ -/* $Revision: 1.3 $ */ -/* $Date: 2005/05/05 14:35:59 $ */ +/* $Revision: 1.14 $ */ +/* $Date: 2006/12/04 22:23:27 $ */ |