From fb26e3d813e4ccd04c6d557d46d14abf011c4641 Mon Sep 17 00:00:00 2001 From: tb <> Date: Wed, 9 Aug 2023 09:23:03 +0000 Subject: Move bn_blind.c to rsa_blinding.c discussed with jsing --- src/lib/libcrypto/rsa/rsa_blinding.c | 261 +++++++++++++++++++++++++++++++++++ 1 file changed, 261 insertions(+) create mode 100644 src/lib/libcrypto/rsa/rsa_blinding.c (limited to 'src/lib/libcrypto/rsa/rsa_blinding.c') diff --git a/src/lib/libcrypto/rsa/rsa_blinding.c b/src/lib/libcrypto/rsa/rsa_blinding.c new file mode 100644 index 0000000000..bc267b1c51 --- /dev/null +++ b/src/lib/libcrypto/rsa/rsa_blinding.c @@ -0,0 +1,261 @@ +/* $OpenBSD: rsa_blinding.c,v 1.1 2023/08/09 09:23:03 tb Exp $ */ +/* ==================================================================== + * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. + * + * 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 above 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 acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ +/* 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 + +#include + +#include +#include + +#include "bn_local.h" +#include "rsa_local.h" + +#define BN_BLINDING_COUNTER 32 + +struct bn_blinding_st { + BIGNUM *A; + BIGNUM *Ai; + BIGNUM *e; + BIGNUM *mod; + CRYPTO_THREADID tid; + int counter; + BN_MONT_CTX *m_ctx; + int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, + const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx); +}; + +BN_BLINDING * +BN_BLINDING_new(const BIGNUM *e, const BIGNUM *mod, BN_CTX *ctx, + int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, + const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx), BN_MONT_CTX *m_ctx) +{ + BN_BLINDING *ret = NULL; + + if ((ret = calloc(1, sizeof(BN_BLINDING))) == NULL) { + BNerror(ERR_R_MALLOC_FAILURE); + goto err; + } + if ((ret->A = BN_new()) == NULL) + goto err; + if ((ret->Ai = BN_new()) == NULL) + goto err; + if ((ret->e = BN_dup(e)) == NULL) + goto err; + if ((ret->mod = BN_dup(mod)) == NULL) + goto err; + if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0) + BN_set_flags(ret->mod, BN_FLG_CONSTTIME); + + /* Update on first use. */ + ret->counter = BN_BLINDING_COUNTER - 1; + CRYPTO_THREADID_current(&ret->tid); + + if (bn_mod_exp != NULL) + ret->bn_mod_exp = bn_mod_exp; + if (m_ctx != NULL) + ret->m_ctx = m_ctx; + + return ret; + + err: + BN_BLINDING_free(ret); + + return NULL; +} + +void +BN_BLINDING_free(BN_BLINDING *r) +{ + if (r == NULL) + return; + + BN_free(r->A); + BN_free(r->Ai); + BN_free(r->e); + BN_free(r->mod); + free(r); +} + +static int +BN_BLINDING_setup(BN_BLINDING *b, BN_CTX *ctx) +{ + if (!bn_rand_interval(b->A, 1, b->mod)) + return 0; + if (BN_mod_inverse_ct(b->Ai, b->A, b->mod, ctx) == NULL) + return 0; + + if (b->bn_mod_exp != NULL && b->m_ctx != NULL) { + if (!b->bn_mod_exp(b->A, b->A, b->e, b->mod, ctx, b->m_ctx)) + return 0; + } else { + if (!BN_mod_exp_ct(b->A, b->A, b->e, b->mod, ctx)) + return 0; + } + + return 1; +} + +static int +BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) +{ + int ret = 0; + + if (++b->counter >= BN_BLINDING_COUNTER) { + if (!BN_BLINDING_setup(b, ctx)) + goto err; + b->counter = 0; + } else { + if (!BN_mod_sqr(b->A, b->A, b->mod, ctx)) + goto err; + if (!BN_mod_sqr(b->Ai, b->Ai, b->mod, ctx)) + goto err; + } + + ret = 1; + + err: + return ret; +} + +int +BN_BLINDING_convert(BIGNUM *n, BIGNUM *inv, BN_BLINDING *b, BN_CTX *ctx) +{ + int ret = 0; + + if (!BN_BLINDING_update(b, ctx)) + goto err; + + if (inv != NULL) { + if (!bn_copy(inv, b->Ai)) + goto err; + } + + ret = BN_mod_mul(n, n, b->A, b->mod, ctx); + + err: + return ret; +} + +int +BN_BLINDING_invert(BIGNUM *n, const BIGNUM *inv, BN_BLINDING *b, BN_CTX *ctx) +{ + if (inv == NULL) + inv = b->Ai; + + return BN_mod_mul(n, n, inv, b->mod, ctx); +} + +CRYPTO_THREADID * +BN_BLINDING_thread_id(BN_BLINDING *b) +{ + return &b->tid; +} -- cgit v1.2.3-55-g6feb