271 lines
9.2 KiB
C
271 lines
9.2 KiB
C
/* crypto/rsa/rsa_gen.c */
|
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
|
* All rights reserved.
|
|
*
|
|
* This package is an SSL implementation written
|
|
* by Eric Young (eay@cryptsoft.com).
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
|
*
|
|
* This library is free for commercial and non-commercial use as long as
|
|
* the following conditions are aheared to. The following conditions
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
|
* included with this distribution is covered by the same copyright terms
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed.
|
|
* If this package is used in a product, Eric Young should be given attribution
|
|
* as the author of the parts of the library used.
|
|
* This can be in the form of a textual message at program startup or
|
|
* in documentation (online or textual) provided with the package.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* "This product includes cryptographic software written by
|
|
* Eric Young (eay@cryptsoft.com)"
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
|
* being used are not cryptographic related :-).
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
|
* the apps directory (application code) you must include an acknowledgement:
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* The licence and distribution terms for any publically available version or
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
|
* copied and put under another distribution licence
|
|
* [including the GNU Public Licence.]
|
|
*/
|
|
|
|
/*
|
|
* NB: these functions have been "upgraded", the deprecated versions (which
|
|
* are compatibility wrappers using these functions) are in rsa_depr.c. -
|
|
* Geoff
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
#include "cryptlib.h"
|
|
#include <openssl/bn.h>
|
|
#include <openssl/rsa.h>
|
|
#ifdef OPENSSL_FIPS
|
|
# include <openssl/fips.h>
|
|
extern int FIPS_rsa_x931_generate_key_ex(RSA *rsa, int bits, BIGNUM *e,
|
|
BN_GENCB *cb);
|
|
#endif
|
|
|
|
static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
|
|
BN_GENCB *cb);
|
|
|
|
/*
|
|
* NB: this wrapper would normally be placed in rsa_lib.c and the static
|
|
* implementation would probably be in rsa_eay.c. Nonetheless, is kept here
|
|
* so that we don't introduce a new linker dependency. Eg. any application
|
|
* that wasn't previously linking object code related to key-generation won't
|
|
* have to now just because key-generation is part of RSA_METHOD.
|
|
*/
|
|
int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
|
|
{
|
|
#ifdef OPENSSL_FIPS
|
|
if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
|
|
&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
|
|
RSAerr(RSA_F_RSA_GENERATE_KEY_EX, RSA_R_NON_FIPS_RSA_METHOD);
|
|
return 0;
|
|
}
|
|
#endif
|
|
if (rsa->meth->rsa_keygen)
|
|
return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
|
|
#ifdef OPENSSL_FIPS
|
|
if (FIPS_mode())
|
|
return FIPS_rsa_x931_generate_key_ex(rsa, bits, e_value, cb);
|
|
#endif
|
|
return rsa_builtin_keygen(rsa, bits, e_value, cb);
|
|
}
|
|
|
|
static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
|
|
BN_GENCB *cb)
|
|
{
|
|
BIGNUM *r0 = NULL, *r1 = NULL, *r2 = NULL, *r3 = NULL, *tmp;
|
|
BIGNUM local_r0, local_d, local_p;
|
|
BIGNUM *pr0, *d, *p;
|
|
int bitsp, bitsq, ok = -1, n = 0;
|
|
BN_CTX *ctx = NULL;
|
|
unsigned long error = 0;
|
|
|
|
/*
|
|
* When generating ridiculously small keys, we can get stuck
|
|
* continually regenerating the same prime values.
|
|
*/
|
|
if (bits < 16) {
|
|
ok = 0; /* we set our own err */
|
|
RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, RSA_R_KEY_SIZE_TOO_SMALL);
|
|
goto err;
|
|
}
|
|
|
|
ctx = BN_CTX_new();
|
|
if (ctx == NULL)
|
|
goto err;
|
|
BN_CTX_start(ctx);
|
|
r0 = BN_CTX_get(ctx);
|
|
r1 = BN_CTX_get(ctx);
|
|
r2 = BN_CTX_get(ctx);
|
|
r3 = BN_CTX_get(ctx);
|
|
if (r3 == NULL)
|
|
goto err;
|
|
|
|
bitsp = (bits + 1) / 2;
|
|
bitsq = bits - bitsp;
|
|
|
|
/* We need the RSA components non-NULL */
|
|
if (!rsa->n && ((rsa->n = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->d && ((rsa->d = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->e && ((rsa->e = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->p && ((rsa->p = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->q && ((rsa->q = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->dmp1 && ((rsa->dmp1 = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->dmq1 && ((rsa->dmq1 = BN_new()) == NULL))
|
|
goto err;
|
|
if (!rsa->iqmp && ((rsa->iqmp = BN_new()) == NULL))
|
|
goto err;
|
|
|
|
if (BN_copy(rsa->e, e_value) == NULL)
|
|
goto err;
|
|
|
|
BN_set_flags(r2, BN_FLG_CONSTTIME);
|
|
/* generate p and q */
|
|
for (;;) {
|
|
if (!BN_generate_prime_ex(rsa->p, bitsp, 0, NULL, NULL, cb))
|
|
goto err;
|
|
if (!BN_sub(r2, rsa->p, BN_value_one()))
|
|
goto err;
|
|
ERR_set_mark();
|
|
if (BN_mod_inverse(r1, r2, rsa->e, ctx) != NULL) {
|
|
/* GCD == 1 since inverse exists */
|
|
break;
|
|
}
|
|
error = ERR_peek_last_error();
|
|
if (ERR_GET_LIB(error) == ERR_LIB_BN
|
|
&& ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
|
|
/* GCD != 1 */
|
|
ERR_pop_to_mark();
|
|
} else {
|
|
goto err;
|
|
}
|
|
if (!BN_GENCB_call(cb, 2, n++))
|
|
goto err;
|
|
}
|
|
if (!BN_GENCB_call(cb, 3, 0))
|
|
goto err;
|
|
for (;;) {
|
|
do {
|
|
if (!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL, cb))
|
|
goto err;
|
|
} while (BN_cmp(rsa->p, rsa->q) == 0);
|
|
if (!BN_sub(r2, rsa->q, BN_value_one()))
|
|
goto err;
|
|
ERR_set_mark();
|
|
if (BN_mod_inverse(r1, r2, rsa->e, ctx) != NULL) {
|
|
/* GCD == 1 since inverse exists */
|
|
break;
|
|
}
|
|
error = ERR_peek_last_error();
|
|
if (ERR_GET_LIB(error) == ERR_LIB_BN
|
|
&& ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
|
|
/* GCD != 1 */
|
|
ERR_pop_to_mark();
|
|
} else {
|
|
goto err;
|
|
}
|
|
if (!BN_GENCB_call(cb, 2, n++))
|
|
goto err;
|
|
}
|
|
if (!BN_GENCB_call(cb, 3, 1))
|
|
goto err;
|
|
if (BN_cmp(rsa->p, rsa->q) < 0) {
|
|
tmp = rsa->p;
|
|
rsa->p = rsa->q;
|
|
rsa->q = tmp;
|
|
}
|
|
|
|
/* calculate n */
|
|
if (!BN_mul(rsa->n, rsa->p, rsa->q, ctx))
|
|
goto err;
|
|
|
|
/* calculate d */
|
|
if (!BN_sub(r1, rsa->p, BN_value_one()))
|
|
goto err; /* p-1 */
|
|
if (!BN_sub(r2, rsa->q, BN_value_one()))
|
|
goto err; /* q-1 */
|
|
if (!BN_mul(r0, r1, r2, ctx))
|
|
goto err; /* (p-1)(q-1) */
|
|
if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
|
|
pr0 = &local_r0;
|
|
BN_with_flags(pr0, r0, BN_FLG_CONSTTIME);
|
|
} else
|
|
pr0 = r0;
|
|
if (!BN_mod_inverse(rsa->d, rsa->e, pr0, ctx))
|
|
goto err; /* d */
|
|
|
|
/* set up d for correct BN_FLG_CONSTTIME flag */
|
|
if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
|
|
d = &local_d;
|
|
BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
|
|
} else
|
|
d = rsa->d;
|
|
|
|
/* calculate d mod (p-1) */
|
|
if (!BN_mod(rsa->dmp1, d, r1, ctx))
|
|
goto err;
|
|
|
|
/* calculate d mod (q-1) */
|
|
if (!BN_mod(rsa->dmq1, d, r2, ctx))
|
|
goto err;
|
|
|
|
/* calculate inverse of q mod p */
|
|
if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
|
|
p = &local_p;
|
|
BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
|
|
} else
|
|
p = rsa->p;
|
|
if (!BN_mod_inverse(rsa->iqmp, rsa->q, p, ctx))
|
|
goto err;
|
|
|
|
ok = 1;
|
|
err:
|
|
if (ok == -1) {
|
|
RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, ERR_LIB_BN);
|
|
ok = 0;
|
|
}
|
|
if (ctx != NULL) {
|
|
BN_CTX_end(ctx);
|
|
BN_CTX_free(ctx);
|
|
}
|
|
|
|
return ok;
|
|
}
|