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/* $OpenBSD: rsa_crpt.c,v 1.19 2018/02/18 12:52:13 tb Exp $ */
/* 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 <openssl/opensslconf.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/rsa.h>
#include "bn_lcl.h"
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
int
RSA_bits(const RSA *r)
{
return BN_num_bits(r->n);
}
int
RSA_size(const RSA *r)
{
return BN_num_bytes(r->n);
}
int
RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
return rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding);
}
int
RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
return rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding);
}
int
RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
return rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding);
}
int
RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
return rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding);
}
int
RSA_flags(const RSA *r)
{
return r == NULL ? 0 : r->meth->flags;
}
void
RSA_blinding_off(RSA *rsa)
{
BN_BLINDING_free(rsa->blinding);
rsa->blinding = NULL;
rsa->flags |= RSA_FLAG_NO_BLINDING;
}
int
RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
{
int ret = 0;
if (rsa->blinding != NULL)
RSA_blinding_off(rsa);
rsa->blinding = RSA_setup_blinding(rsa, ctx);
if (rsa->blinding == NULL)
goto err;
rsa->flags &= ~RSA_FLAG_NO_BLINDING;
ret = 1;
err:
return (ret);
}
static BIGNUM *
rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, const BIGNUM *q,
BN_CTX *ctx)
{
BIGNUM *ret = NULL, *r0, *r1, *r2;
if (d == NULL || p == NULL || q == NULL)
return NULL;
BN_CTX_start(ctx);
if ((r0 = BN_CTX_get(ctx)) == NULL)
goto err;
if ((r1 = BN_CTX_get(ctx)) == NULL)
goto err;
if ((r2 = BN_CTX_get(ctx)) == NULL)
goto err;
if (!BN_sub(r1, p, BN_value_one()))
goto err;
if (!BN_sub(r2, q, BN_value_one()))
goto err;
if (!BN_mul(r0, r1, r2, ctx))
goto err;
ret = BN_mod_inverse_ct(NULL, d, r0, ctx);
err:
BN_CTX_end(ctx);
return ret;
}
BN_BLINDING *
RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
{
BIGNUM *e;
BIGNUM n;
BN_CTX *ctx;
BN_BLINDING *ret = NULL;
if (in_ctx == NULL) {
if ((ctx = BN_CTX_new()) == NULL)
return 0;
} else
ctx = in_ctx;
BN_CTX_start(ctx);
if (rsa->e == NULL) {
e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
if (e == NULL) {
RSAerror(RSA_R_NO_PUBLIC_EXPONENT);
goto err;
}
} else
e = rsa->e;
BN_init(&n);
BN_with_flags(&n, rsa->n, BN_FLG_CONSTTIME);
ret = BN_BLINDING_create_param(NULL, e, &n, ctx, rsa->meth->bn_mod_exp,
rsa->_method_mod_n);
if (ret == NULL) {
RSAerror(ERR_R_BN_LIB);
goto err;
}
CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
err:
BN_CTX_end(ctx);
if (in_ctx == NULL)
BN_CTX_free(ctx);
if (rsa->e == NULL)
BN_free(e);
return ret;
}
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