/* crypto/rsa/rsa_lib.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 #include #include "internal/cryptlib.h" #include #include "internal/bn_int.h" #include #include 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_BLINDING; 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_BLINDING; 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); 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 = NULL; BIGNUM *e, *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); e = BN_CTX_get(ctx); if (e == NULL) { RSAerr(RSA_F_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) { RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); goto err; } } else e = rsa->e; if ((RAND_status() == 0) && rsa->d != NULL && bn_get_words(rsa->d) != NULL) { /* * if PRNG is not properly seeded, resort to secret exponent as * unpredictable seed */ RAND_add(bn_get_words(rsa->d), bn_get_dmax(rsa->d) * sizeof(BN_ULONG), 0.0); } if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { /* Set BN_FLG_CONSTTIME flag */ local_n = n = BN_new(); if (!local_n) { RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); goto err; } BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); } else n = rsa->n; ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp, rsa->_method_mod_n); if (ret == NULL) { RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); goto err; } CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret)); err: BN_CTX_end(ctx); if (ctx != in_ctx) BN_CTX_free(ctx); if (e != rsa->e) BN_free(e); BN_free(local_n); return ret; }