248 lines
7.9 KiB
C
248 lines
7.9 KiB
C
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/* crypto/rsa/rsa_lib.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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#include <stdio.h>
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#include <openssl/crypto.h>
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#include "cryptlib.h"
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#include <openssl/lhash.h>
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/rand.h>
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#ifndef OPENSSL_NO_ENGINE
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# include <openssl/engine.h>
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#endif
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int RSA_size(const RSA *r)
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{
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return (BN_num_bytes(r->n));
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}
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int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
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RSA *rsa, int padding)
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{
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#ifdef OPENSSL_FIPS
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if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
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&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
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RSAerr(RSA_F_RSA_PUBLIC_ENCRYPT, RSA_R_NON_FIPS_RSA_METHOD);
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return -1;
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}
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#endif
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return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
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}
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int RSA_private_encrypt(int flen, const unsigned char *from,
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unsigned char *to, RSA *rsa, int padding)
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{
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#ifdef OPENSSL_FIPS
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if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
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&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
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RSAerr(RSA_F_RSA_PRIVATE_ENCRYPT, RSA_R_NON_FIPS_RSA_METHOD);
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return -1;
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}
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#endif
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return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
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}
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int RSA_private_decrypt(int flen, const unsigned char *from,
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unsigned char *to, RSA *rsa, int padding)
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{
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#ifdef OPENSSL_FIPS
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if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
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&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
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RSAerr(RSA_F_RSA_PRIVATE_DECRYPT, RSA_R_NON_FIPS_RSA_METHOD);
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return -1;
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}
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#endif
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return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
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}
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int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
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RSA *rsa, int padding)
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{
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#ifdef OPENSSL_FIPS
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if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
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&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
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RSAerr(RSA_F_RSA_PUBLIC_DECRYPT, RSA_R_NON_FIPS_RSA_METHOD);
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return -1;
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}
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#endif
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return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
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}
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int RSA_flags(const RSA *r)
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{
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return ((r == NULL) ? 0 : r->meth->flags);
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}
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void RSA_blinding_off(RSA *rsa)
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{
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if (rsa->blinding != NULL) {
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BN_BLINDING_free(rsa->blinding);
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rsa->blinding = NULL;
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}
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rsa->flags &= ~RSA_FLAG_BLINDING;
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rsa->flags |= RSA_FLAG_NO_BLINDING;
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}
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int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
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{
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int ret = 0;
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if (rsa->blinding != NULL)
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RSA_blinding_off(rsa);
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rsa->blinding = RSA_setup_blinding(rsa, ctx);
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if (rsa->blinding == NULL)
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goto err;
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rsa->flags |= RSA_FLAG_BLINDING;
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rsa->flags &= ~RSA_FLAG_NO_BLINDING;
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ret = 1;
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err:
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return (ret);
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}
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static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
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const BIGNUM *q, BN_CTX *ctx)
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{
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BIGNUM *ret = NULL, *r0, *r1, *r2;
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if (d == NULL || p == NULL || q == NULL)
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return NULL;
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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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if (r2 == NULL)
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goto err;
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if (!BN_sub(r1, p, BN_value_one()))
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goto err;
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if (!BN_sub(r2, q, BN_value_one()))
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goto err;
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if (!BN_mul(r0, r1, r2, ctx))
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goto err;
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ret = BN_mod_inverse(NULL, d, r0, ctx);
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err:
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BN_CTX_end(ctx);
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return ret;
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}
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BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
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{
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BIGNUM local_n;
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BIGNUM *e, *n;
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BN_CTX *ctx;
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BN_BLINDING *ret = NULL;
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if (in_ctx == NULL) {
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if ((ctx = BN_CTX_new()) == NULL)
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return 0;
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} else
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ctx = in_ctx;
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BN_CTX_start(ctx);
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e = BN_CTX_get(ctx);
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if (e == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (rsa->e == NULL) {
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e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
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if (e == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
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goto err;
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}
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} else
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e = rsa->e;
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if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) {
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/*
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* if PRNG is not properly seeded, resort to secret exponent as
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* unpredictable seed
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*/
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RAND_add(rsa->d->d, rsa->d->dmax * sizeof(rsa->d->d[0]), 0.0);
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}
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if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
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/* Set BN_FLG_CONSTTIME flag */
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n = &local_n;
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BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
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} else
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n = rsa->n;
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ret = BN_BLINDING_create_param(NULL, e, n, ctx,
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rsa->meth->bn_mod_exp, rsa->_method_mod_n);
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if (ret == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
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goto err;
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}
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CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
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err:
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BN_CTX_end(ctx);
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if (in_ctx == NULL)
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BN_CTX_free(ctx);
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if (rsa->e == NULL)
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BN_free(e);
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return ret;
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}
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