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/* 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.]
*/
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#ifndef OPENSSL_FIPS
/* X9.31 RSA key derivation and generation */
int RSA_X931_derive_ex(RSA *rsa, BIGNUM *p1, BIGNUM *p2, BIGNUM *q1, BIGNUM *q2,
const BIGNUM *Xp1, const BIGNUM *Xp2, const BIGNUM *Xp,
const BIGNUM *Xq1, const BIGNUM *Xq2, const BIGNUM *Xq,
const BIGNUM *e, BN_GENCB *cb)
{
BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL;
BN_CTX *ctx=NULL,*ctx2=NULL;
if (!rsa)
goto err;
ctx = BN_CTX_new();
if (!ctx)
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;
if (!rsa->e)
{
rsa->e = BN_dup(e);
if (!rsa->e)
goto err;
}
else
e = rsa->e;
/* If not all parameters present only calculate what we can.
* This allows test programs to output selective parameters.
*/
if (Xp && !rsa->p)
{
rsa->p = BN_new();
if (!rsa->p)
goto err;
if (!BN_X931_derive_prime_ex(rsa->p, p1, p2,
Xp, Xp1, Xp2, e, ctx, cb))
goto err;
}
if (Xq && !rsa->q)
{
rsa->q = BN_new();
if (!rsa->q)
goto err;
if (!BN_X931_derive_prime_ex(rsa->q, q1, q2,
Xq, Xq1, Xq2, e, ctx, cb))
goto err;
}
if (!rsa->p || !rsa->q)
{
BN_CTX_end(ctx);
BN_CTX_free(ctx);
return 2;
}
/* Since both primes are set we can now calculate all remaining
* components.
*/
/* calculate n */
rsa->n=BN_new();
if (rsa->n == NULL)
goto err;
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 (!BN_gcd(r3, r1, r2, ctx))
goto err;
if (!BN_div(r0, NULL, r0, r3, ctx))
goto err; /* LCM((p-1)(q-1)) */
ctx2 = BN_CTX_new();
if (!ctx2)
goto err;
rsa->d=BN_mod_inverse(NULL,rsa->e,r0,ctx2); /* d */
if (rsa->d == NULL)
goto err;
/* calculate d mod (p-1) */
rsa->dmp1=BN_new();
if (rsa->dmp1 == NULL)
goto err;
if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx))
goto err;
/* calculate d mod (q-1) */
rsa->dmq1=BN_new();
if (rsa->dmq1 == NULL)
goto err;
if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx))
goto err;
/* calculate inverse of q mod p */
rsa->iqmp=BN_mod_inverse(NULL,rsa->q,rsa->p,ctx2);
err:
if (ctx)
{
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
if (ctx2)
BN_CTX_free(ctx2);
/* If this is set all calls successful */
if (rsa && rsa->iqmp != NULL)
return 1;
return 0;
}
int RSA_X931_generate_key_ex(RSA *rsa, int bits, const BIGNUM *e, BN_GENCB *cb)
{
int ok = 0;
BIGNUM *Xp = NULL, *Xq = NULL;
BN_CTX *ctx = NULL;
ctx = BN_CTX_new();
if (!ctx)
goto error;
BN_CTX_start(ctx);
Xp = BN_CTX_get(ctx);
Xq = BN_CTX_get(ctx);
if (!BN_X931_generate_Xpq(Xp, Xq, bits, ctx))
goto error;
rsa->p = BN_new();
rsa->q = BN_new();
if (!rsa->p || !rsa->q)
goto error;
/* Generate two primes from Xp, Xq */
if (!BN_X931_generate_prime_ex(rsa->p, NULL, NULL, NULL, NULL, Xp,
e, ctx, cb))
goto error;
if (!BN_X931_generate_prime_ex(rsa->q, NULL, NULL, NULL, NULL, Xq,
e, ctx, cb))
goto error;
/* Since rsa->p and rsa->q are valid this call will just derive
* remaining RSA components.
*/
if (!RSA_X931_derive_ex(rsa, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, e, cb))
goto error;
ok = 1;
error:
if (ctx)
{
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
if (ok)
return 1;
return 0;
}
#endif