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