235 lines
7.7 KiB
C
235 lines
7.7 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>
|
||
|
|
#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_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;
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
BN_copy(rsa->e, e_value);
|
||
|
|
|
||
|
|
/* 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;
|
||
|
|
if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
|
||
|
|
if (BN_is_one(r1)) break;
|
||
|
|
if(!BN_GENCB_call(cb, 2, n++))
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
if(!BN_GENCB_call(cb, 3, 0))
|
||
|
|
goto err;
|
||
|
|
for (;;)
|
||
|
|
{
|
||
|
|
/* When generating ridiculously small keys, we can get stuck
|
||
|
|
* continually regenerating the same prime values. Check for
|
||
|
|
* this and bail if it happens 3 times. */
|
||
|
|
unsigned int degenerate = 0;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if(!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL, cb))
|
||
|
|
goto err;
|
||
|
|
} while((BN_cmp(rsa->p, rsa->q) == 0) && (++degenerate < 3));
|
||
|
|
if(degenerate == 3)
|
||
|
|
{
|
||
|
|
ok = 0; /* we set our own err */
|
||
|
|
RSAerr(RSA_F_RSA_BUILTIN_KEYGEN,RSA_R_KEY_SIZE_TOO_SMALL);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
if (!BN_sub(r2,rsa->q,BN_value_one())) goto err;
|
||
|
|
if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
|
||
|
|
if (BN_is_one(r1))
|
||
|
|
break;
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|