diff options
Diffstat (limited to 'src/crypto/rsa/blinding.c')
| -rw-r--r-- | src/crypto/rsa/blinding.c | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/src/crypto/rsa/blinding.c b/src/crypto/rsa/blinding.c new file mode 100644 index 0000000..06f87a7 --- /dev/null +++ b/src/crypto/rsa/blinding.c @@ -0,0 +1,471 @@ +/* ==================================================================== + * 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 <openssl/rsa.h> + +#include <string.h> + +#include <openssl/bn.h> +#include <openssl/mem.h> +#include <openssl/err.h> + +#include "internal.h" + + +#define BN_BLINDING_COUNTER 32 + +struct bn_blinding_st { + BIGNUM *A; + BIGNUM *Ai; + BIGNUM *e; + BIGNUM *mod; /* just a reference */ + CRYPTO_THREADID tid; + int counter; + unsigned long flags; + 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 *A, const BIGNUM *Ai, BIGNUM *mod) { + BN_BLINDING *ret = NULL; + + ret = (BN_BLINDING*) OPENSSL_malloc(sizeof(BN_BLINDING)); + if (ret == NULL) { + OPENSSL_PUT_ERROR(RSA, BN_BLINDING_new, ERR_R_MALLOC_FAILURE); + return NULL; + } + memset(ret, 0, sizeof(BN_BLINDING)); + if (A != NULL) { + ret->A = BN_dup(A); + if (ret->A == NULL) { + goto err; + } + } + if (Ai != NULL) { + ret->Ai = BN_dup(Ai); + if (ret->Ai == NULL) { + goto err; + } + } + + /* save a copy of mod in the BN_BLINDING structure */ + ret->mod = BN_dup(mod); + if (ret->mod == NULL) { + goto err; + } + if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0) { + BN_set_flags(ret->mod, BN_FLG_CONSTTIME); + } + + /* Set the counter to the special value -1 + * to indicate that this is never-used fresh blinding + * that does not need updating before first use. */ + ret->counter = -1; + CRYPTO_THREADID_current(&ret->tid); + return ret; + +err: + if (ret != NULL) { + BN_BLINDING_free(ret); + } + return NULL; +} + +void BN_BLINDING_free(BN_BLINDING *r) { + if (r == NULL) { + return; + } + + if (r->A != NULL) + BN_free(r->A); + if (r->Ai != NULL) + BN_free(r->Ai); + if (r->e != NULL) + BN_free(r->e); + if (r->mod != NULL) + BN_free(r->mod); + OPENSSL_free(r); +} + +int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) { + int ret = 0; + + if (b->A == NULL || b->Ai == NULL) { + OPENSSL_PUT_ERROR(RSA, BN_BLINDING_update, RSA_R_BN_NOT_INITIALIZED); + goto err; + } + + if (b->counter == -1) { + b->counter = 0; + } + + if (++b->counter == BN_BLINDING_COUNTER && b->e != NULL && + !(b->flags & BN_BLINDING_NO_RECREATE)) { + /* re-create blinding parameters */ + if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL)) { + goto err; + } + } else if (!(b->flags & BN_BLINDING_NO_UPDATE)) { + if (!BN_mod_mul(b->A, b->A, b->A, b->mod, ctx)) { + goto err; + } + if (!BN_mod_mul(b->Ai, b->Ai, b->Ai, b->mod, ctx)) { + goto err; + } + } + + ret = 1; + +err: + if (b->counter == BN_BLINDING_COUNTER) { + b->counter = 0; + } + return ret; +} + +int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) { + return BN_BLINDING_convert_ex(n, NULL, b, ctx); +} + +int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx) { + int ret = 1; + + if (b->A == NULL || b->Ai == NULL) { + OPENSSL_PUT_ERROR(RSA, BN_BLINDING_convert_ex, RSA_R_BN_NOT_INITIALIZED); + return 0; + } + + if (b->counter == -1) { + /* Fresh blinding, doesn't need updating. */ + b->counter = 0; + } else if (!BN_BLINDING_update(b, ctx)) { + return 0; + } + + if (r != NULL) { + if (!BN_copy(r, b->Ai)) { + ret = 0; + } + } + + if (!BN_mod_mul(n, n, b->A, b->mod, ctx)) { + ret = 0; + } + + return ret; +} + +int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) { + return BN_BLINDING_invert_ex(n, NULL, b, ctx); +} + +int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, + BN_CTX *ctx) { + int ret; + + if (r != NULL) { + ret = BN_mod_mul(n, n, r, b->mod, ctx); + } else { + if (b->Ai == NULL) { + OPENSSL_PUT_ERROR(RSA, BN_BLINDING_invert_ex, RSA_R_BN_NOT_INITIALIZED); + return 0; + } + ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx); + } + + return ret; +} + +CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *b) { return &b->tid; } + +unsigned long BN_BLINDING_get_flags(const BN_BLINDING *b) { return b->flags; } + +void BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags) { + b->flags = flags; +} + +BN_BLINDING *BN_BLINDING_create_param( + BN_BLINDING *b, const BIGNUM *e, BIGNUM *m, 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) { + int retry_counter = 32; + BN_BLINDING *ret = NULL; + + if (b == NULL) { + ret = BN_BLINDING_new(NULL, NULL, m); + } else { + ret = b; + } + + if (ret == NULL) { + goto err; + } + + if (ret->A == NULL && (ret->A = BN_new()) == NULL) { + goto err; + } + if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL) { + goto err; + } + + if (e != NULL) { + if (ret->e != NULL) { + BN_free(ret->e); + } + ret->e = BN_dup(e); + } + if (ret->e == NULL) { + goto err; + } + + if (bn_mod_exp != NULL) { + ret->bn_mod_exp = bn_mod_exp; + } + if (m_ctx != NULL) { + ret->m_ctx = m_ctx; + } + + do { + if (!BN_rand_range(ret->A, ret->mod)) { + goto err; + } + if (BN_mod_inverse(ret->Ai, ret->A, ret->mod, ctx) == NULL) { + /* this should almost never happen for good RSA keys */ + uint32_t error = ERR_peek_last_error(); + if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) { + if (retry_counter-- == 0) { + OPENSSL_PUT_ERROR(RSA, BN_BLINDING_create_param, + RSA_R_TOO_MANY_ITERATIONS); + goto err; + } + ERR_clear_error(); + } else { + goto err; + } + } else { + break; + } + } while (1); + + if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL) { + if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx, ret->m_ctx)) { + goto err; + } + } else { + if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)) { + goto err; + } + } + + return ret; + +err: + if (b == NULL && ret != NULL) { + BN_BLINDING_free(ret); + ret = NULL; + } + + 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); + r0 = BN_CTX_get(ctx); + r1 = BN_CTX_get(ctx); + r2 = BN_CTX_get(ctx); + if (r2 == 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(NULL, d, r0, ctx); + +err: + BN_CTX_end(ctx); + return ret; +} + +BN_BLINDING *rsa_setup_blinding(RSA *rsa, BN_CTX *in_ctx) { + BIGNUM local_n; + BIGNUM *e, *n; + BN_CTX *ctx; + BN_BLINDING *ret = NULL; + + if (in_ctx == NULL) { + ctx = BN_CTX_new(); + if (ctx == NULL) { + return 0; + } + } else { + ctx = in_ctx; + } + + BN_CTX_start(ctx); + e = BN_CTX_get(ctx); + if (e == NULL) { + OPENSSL_PUT_ERROR(RSA, rsa_setup_blinding, ERR_R_MALLOC_FAILURE); + goto err; + } + + if (rsa->e == NULL) { + e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); + if (e == NULL) { + OPENSSL_PUT_ERROR(RSA, rsa_setup_blinding, RSA_R_NO_PUBLIC_EXPONENT); + goto err; + } + } else { + e = rsa->e; + } + + n = &local_n; + BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); + + if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) { + if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, + ctx)) { + goto err; + } + } + + ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp, + rsa->_method_mod_n); + if (ret == NULL) { + OPENSSL_PUT_ERROR(RSA, rsa_setup_blinding, 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; +} |