1 /* crypto/rsa/rsa_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include <openssl/crypto.h> 61 #include "cryptlib.h" 62 #include <openssl/lhash.h> 63 #include <openssl/bn.h> 64 #include <openssl/rsa.h> 65 #include <openssl/rand.h> 66 #ifndef OPENSSL_NO_ENGINE 67 #include <openssl/engine.h> 68 #endif 69 70 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, 71 RSA *rsa, int padding) 72 { 73 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); 74 } 75 76 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, 77 RSA *rsa, int padding) 78 { 79 #ifdef OPENSSL_FIPS 80 if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) 81 { 82 RSAerr(RSA_F_RSA_PRIVATE_ENCRYPT, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); 83 return 0; 84 } 85 #endif 86 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); 87 } 88 89 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, 90 RSA *rsa, int padding) 91 { 92 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); 93 } 94 95 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, 96 RSA *rsa, int padding) 97 { 98 #ifdef OPENSSL_FIPS 99 if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) 100 { 101 RSAerr(RSA_F_RSA_PUBLIC_DECRYPT, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); 102 return 0; 103 } 104 #endif 105 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); 106 } 107 108 int RSA_size(const RSA *r) 109 { 110 return(BN_num_bytes(r->n)); 111 } 112 113 void RSA_blinding_off(RSA *rsa) 114 { 115 if (rsa->blinding != NULL) 116 { 117 BN_BLINDING_free(rsa->blinding); 118 rsa->blinding=NULL; 119 } 120 rsa->flags &= ~RSA_FLAG_BLINDING; 121 rsa->flags |= RSA_FLAG_NO_BLINDING; 122 } 123 124 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx) 125 { 126 int ret=0; 127 128 if (rsa->blinding != NULL) 129 RSA_blinding_off(rsa); 130 131 rsa->blinding = RSA_setup_blinding(rsa, ctx); 132 if (rsa->blinding == NULL) 133 goto err; 134 135 rsa->flags |= RSA_FLAG_BLINDING; 136 rsa->flags &= ~RSA_FLAG_NO_BLINDING; 137 ret=1; 138 err: 139 return(ret); 140 } 141 142 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, 143 const BIGNUM *q, BN_CTX *ctx) 144 { 145 BIGNUM *ret = NULL, *r0, *r1, *r2; 146 147 if (d == NULL || p == NULL || q == NULL) 148 return NULL; 149 150 BN_CTX_start(ctx); 151 r0 = BN_CTX_get(ctx); 152 r1 = BN_CTX_get(ctx); 153 r2 = BN_CTX_get(ctx); 154 if (r2 == NULL) 155 goto err; 156 157 if (!BN_sub(r1, p, BN_value_one())) goto err; 158 if (!BN_sub(r2, q, BN_value_one())) goto err; 159 if (!BN_mul(r0, r1, r2, ctx)) goto err; 160 161 ret = BN_mod_inverse(NULL, d, r0, ctx); 162 err: 163 BN_CTX_end(ctx); 164 return ret; 165 } 166 167 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) 168 { 169 BIGNUM local_n; 170 BIGNUM *e,*n; 171 BN_CTX *ctx; 172 BN_BLINDING *ret = NULL; 173 174 if (in_ctx == NULL) 175 { 176 if ((ctx = BN_CTX_new()) == NULL) return 0; 177 } 178 else 179 ctx = in_ctx; 180 181 BN_CTX_start(ctx); 182 e = BN_CTX_get(ctx); 183 if (e == NULL) 184 { 185 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); 186 goto err; 187 } 188 189 if (rsa->e == NULL) 190 { 191 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); 192 if (e == NULL) 193 { 194 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); 195 goto err; 196 } 197 } 198 else 199 e = rsa->e; 200 201 202 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) 203 { 204 /* if PRNG is not properly seeded, resort to secret 205 * exponent as unpredictable seed */ 206 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0); 207 } 208 209 if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) 210 { 211 /* Set BN_FLG_CONSTTIME flag */ 212 n = &local_n; 213 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); 214 } 215 else 216 n = rsa->n; 217 218 ret = BN_BLINDING_create_param(NULL, e, n, ctx, 219 rsa->meth->bn_mod_exp, rsa->_method_mod_n); 220 if (ret == NULL) 221 { 222 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); 223 goto err; 224 } 225 BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id()); 226 err: 227 BN_CTX_end(ctx); 228 if (in_ctx == NULL) 229 BN_CTX_free(ctx); 230 if(rsa->e == NULL) 231 BN_free(e); 232 233 return ret; 234 } 235