1f5b1c8a1SJohn Marino /* $OpenBSD: rsa_crpt.c,v 1.15 2016/06/30 02:02:06 bcook Exp $ */ 2f5b1c8a1SJohn Marino /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3f5b1c8a1SJohn Marino * All rights reserved. 4f5b1c8a1SJohn Marino * 5f5b1c8a1SJohn Marino * This package is an SSL implementation written 6f5b1c8a1SJohn Marino * by Eric Young (eay@cryptsoft.com). 7f5b1c8a1SJohn Marino * The implementation was written so as to conform with Netscapes SSL. 8f5b1c8a1SJohn Marino * 9f5b1c8a1SJohn Marino * This library is free for commercial and non-commercial use as long as 10f5b1c8a1SJohn Marino * the following conditions are aheared to. The following conditions 11f5b1c8a1SJohn Marino * apply to all code found in this distribution, be it the RC4, RSA, 12f5b1c8a1SJohn Marino * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13f5b1c8a1SJohn Marino * included with this distribution is covered by the same copyright terms 14f5b1c8a1SJohn Marino * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15f5b1c8a1SJohn Marino * 16f5b1c8a1SJohn Marino * Copyright remains Eric Young's, and as such any Copyright notices in 17f5b1c8a1SJohn Marino * the code are not to be removed. 18f5b1c8a1SJohn Marino * If this package is used in a product, Eric Young should be given attribution 19f5b1c8a1SJohn Marino * as the author of the parts of the library used. 20f5b1c8a1SJohn Marino * This can be in the form of a textual message at program startup or 21f5b1c8a1SJohn Marino * in documentation (online or textual) provided with the package. 22f5b1c8a1SJohn Marino * 23f5b1c8a1SJohn Marino * Redistribution and use in source and binary forms, with or without 24f5b1c8a1SJohn Marino * modification, are permitted provided that the following conditions 25f5b1c8a1SJohn Marino * are met: 26f5b1c8a1SJohn Marino * 1. Redistributions of source code must retain the copyright 27f5b1c8a1SJohn Marino * notice, this list of conditions and the following disclaimer. 28f5b1c8a1SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright 29f5b1c8a1SJohn Marino * notice, this list of conditions and the following disclaimer in the 30f5b1c8a1SJohn Marino * documentation and/or other materials provided with the distribution. 31f5b1c8a1SJohn Marino * 3. All advertising materials mentioning features or use of this software 32f5b1c8a1SJohn Marino * must display the following acknowledgement: 33f5b1c8a1SJohn Marino * "This product includes cryptographic software written by 34f5b1c8a1SJohn Marino * Eric Young (eay@cryptsoft.com)" 35f5b1c8a1SJohn Marino * The word 'cryptographic' can be left out if the rouines from the library 36f5b1c8a1SJohn Marino * being used are not cryptographic related :-). 37f5b1c8a1SJohn Marino * 4. If you include any Windows specific code (or a derivative thereof) from 38f5b1c8a1SJohn Marino * the apps directory (application code) you must include an acknowledgement: 39f5b1c8a1SJohn Marino * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40f5b1c8a1SJohn Marino * 41f5b1c8a1SJohn Marino * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42f5b1c8a1SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43f5b1c8a1SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44f5b1c8a1SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45f5b1c8a1SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46f5b1c8a1SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47f5b1c8a1SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48f5b1c8a1SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49f5b1c8a1SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50f5b1c8a1SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51f5b1c8a1SJohn Marino * SUCH DAMAGE. 52f5b1c8a1SJohn Marino * 53f5b1c8a1SJohn Marino * The licence and distribution terms for any publically available version or 54f5b1c8a1SJohn Marino * derivative of this code cannot be changed. i.e. this code cannot simply be 55f5b1c8a1SJohn Marino * copied and put under another distribution licence 56f5b1c8a1SJohn Marino * [including the GNU Public Licence.] 57f5b1c8a1SJohn Marino */ 58f5b1c8a1SJohn Marino 59f5b1c8a1SJohn Marino #include <stdio.h> 60f5b1c8a1SJohn Marino 61f5b1c8a1SJohn Marino #include <openssl/opensslconf.h> 62f5b1c8a1SJohn Marino 63f5b1c8a1SJohn Marino #include <openssl/bn.h> 64f5b1c8a1SJohn Marino #include <openssl/crypto.h> 65f5b1c8a1SJohn Marino #include <openssl/err.h> 66f5b1c8a1SJohn Marino #include <openssl/lhash.h> 67f5b1c8a1SJohn Marino #include <openssl/rsa.h> 68f5b1c8a1SJohn Marino 69f5b1c8a1SJohn Marino #ifndef OPENSSL_NO_ENGINE 70f5b1c8a1SJohn Marino #include <openssl/engine.h> 71f5b1c8a1SJohn Marino #endif 72f5b1c8a1SJohn Marino 73f5b1c8a1SJohn Marino int 74f5b1c8a1SJohn Marino RSA_size(const RSA *r) 75f5b1c8a1SJohn Marino { 76f5b1c8a1SJohn Marino return BN_num_bytes(r->n); 77f5b1c8a1SJohn Marino } 78f5b1c8a1SJohn Marino 79f5b1c8a1SJohn Marino int 80f5b1c8a1SJohn Marino RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, 81f5b1c8a1SJohn Marino RSA *rsa, int padding) 82f5b1c8a1SJohn Marino { 83f5b1c8a1SJohn Marino return rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding); 84f5b1c8a1SJohn Marino } 85f5b1c8a1SJohn Marino 86f5b1c8a1SJohn Marino int 87f5b1c8a1SJohn Marino RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, 88f5b1c8a1SJohn Marino RSA *rsa, int padding) 89f5b1c8a1SJohn Marino { 90f5b1c8a1SJohn Marino return rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding); 91f5b1c8a1SJohn Marino } 92f5b1c8a1SJohn Marino 93f5b1c8a1SJohn Marino int 94f5b1c8a1SJohn Marino RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, 95f5b1c8a1SJohn Marino RSA *rsa, int padding) 96f5b1c8a1SJohn Marino { 97f5b1c8a1SJohn Marino return rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding); 98f5b1c8a1SJohn Marino } 99f5b1c8a1SJohn Marino 100f5b1c8a1SJohn Marino int 101f5b1c8a1SJohn Marino RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, 102f5b1c8a1SJohn Marino RSA *rsa, int padding) 103f5b1c8a1SJohn Marino { 104f5b1c8a1SJohn Marino return rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding); 105f5b1c8a1SJohn Marino } 106f5b1c8a1SJohn Marino 107f5b1c8a1SJohn Marino int 108f5b1c8a1SJohn Marino RSA_flags(const RSA *r) 109f5b1c8a1SJohn Marino { 110f5b1c8a1SJohn Marino return r == NULL ? 0 : r->meth->flags; 111f5b1c8a1SJohn Marino } 112f5b1c8a1SJohn Marino 113f5b1c8a1SJohn Marino void 114f5b1c8a1SJohn Marino RSA_blinding_off(RSA *rsa) 115f5b1c8a1SJohn Marino { 116f5b1c8a1SJohn Marino BN_BLINDING_free(rsa->blinding); 117f5b1c8a1SJohn Marino rsa->blinding = NULL; 118f5b1c8a1SJohn Marino rsa->flags |= RSA_FLAG_NO_BLINDING; 119f5b1c8a1SJohn Marino } 120f5b1c8a1SJohn Marino 121f5b1c8a1SJohn Marino int 122f5b1c8a1SJohn Marino RSA_blinding_on(RSA *rsa, BN_CTX *ctx) 123f5b1c8a1SJohn Marino { 124f5b1c8a1SJohn Marino int ret = 0; 125f5b1c8a1SJohn Marino 126f5b1c8a1SJohn Marino if (rsa->blinding != NULL) 127f5b1c8a1SJohn Marino RSA_blinding_off(rsa); 128f5b1c8a1SJohn Marino 129f5b1c8a1SJohn Marino rsa->blinding = RSA_setup_blinding(rsa, ctx); 130f5b1c8a1SJohn Marino if (rsa->blinding == NULL) 131f5b1c8a1SJohn Marino goto err; 132f5b1c8a1SJohn Marino 133f5b1c8a1SJohn Marino rsa->flags &= ~RSA_FLAG_NO_BLINDING; 134f5b1c8a1SJohn Marino ret = 1; 135f5b1c8a1SJohn Marino err: 136f5b1c8a1SJohn Marino return (ret); 137f5b1c8a1SJohn Marino } 138f5b1c8a1SJohn Marino 139f5b1c8a1SJohn Marino static BIGNUM * 140f5b1c8a1SJohn Marino rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, const BIGNUM *q, 141f5b1c8a1SJohn Marino BN_CTX *ctx) 142f5b1c8a1SJohn Marino { 143f5b1c8a1SJohn Marino BIGNUM *ret = NULL, *r0, *r1, *r2; 144f5b1c8a1SJohn Marino 145f5b1c8a1SJohn Marino if (d == NULL || p == NULL || q == NULL) 146f5b1c8a1SJohn Marino return NULL; 147f5b1c8a1SJohn Marino 148f5b1c8a1SJohn Marino BN_CTX_start(ctx); 149f5b1c8a1SJohn Marino if ((r0 = BN_CTX_get(ctx)) == NULL) 150f5b1c8a1SJohn Marino goto err; 151f5b1c8a1SJohn Marino if ((r1 = BN_CTX_get(ctx)) == NULL) 152f5b1c8a1SJohn Marino goto err; 153f5b1c8a1SJohn Marino if ((r2 = BN_CTX_get(ctx)) == NULL) 154f5b1c8a1SJohn Marino goto err; 155f5b1c8a1SJohn Marino 156f5b1c8a1SJohn Marino if (!BN_sub(r1, p, BN_value_one())) 157f5b1c8a1SJohn Marino goto err; 158f5b1c8a1SJohn Marino if (!BN_sub(r2, q, BN_value_one())) 159f5b1c8a1SJohn Marino goto err; 160f5b1c8a1SJohn Marino if (!BN_mul(r0, r1, r2, ctx)) 161f5b1c8a1SJohn Marino goto err; 162f5b1c8a1SJohn Marino 163f5b1c8a1SJohn Marino ret = BN_mod_inverse(NULL, d, r0, ctx); 164f5b1c8a1SJohn Marino err: 165f5b1c8a1SJohn Marino BN_CTX_end(ctx); 166f5b1c8a1SJohn Marino return ret; 167f5b1c8a1SJohn Marino } 168f5b1c8a1SJohn Marino 169f5b1c8a1SJohn Marino BN_BLINDING * 170f5b1c8a1SJohn Marino RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) 171f5b1c8a1SJohn Marino { 172f5b1c8a1SJohn Marino BIGNUM *e; 173f5b1c8a1SJohn Marino BIGNUM n; 174f5b1c8a1SJohn Marino BN_CTX *ctx; 175f5b1c8a1SJohn Marino BN_BLINDING *ret = NULL; 176f5b1c8a1SJohn Marino 177f5b1c8a1SJohn Marino if (in_ctx == NULL) { 178f5b1c8a1SJohn Marino if ((ctx = BN_CTX_new()) == NULL) 179f5b1c8a1SJohn Marino return 0; 180f5b1c8a1SJohn Marino } else 181f5b1c8a1SJohn Marino ctx = in_ctx; 182f5b1c8a1SJohn Marino 183f5b1c8a1SJohn Marino BN_CTX_start(ctx); 184f5b1c8a1SJohn Marino 185f5b1c8a1SJohn Marino if (rsa->e == NULL) { 186f5b1c8a1SJohn Marino e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); 187f5b1c8a1SJohn Marino if (e == NULL) { 188f5b1c8a1SJohn Marino RSAerr(RSA_F_RSA_SETUP_BLINDING, 189f5b1c8a1SJohn Marino RSA_R_NO_PUBLIC_EXPONENT); 190f5b1c8a1SJohn Marino goto err; 191f5b1c8a1SJohn Marino } 192f5b1c8a1SJohn Marino } else 193f5b1c8a1SJohn Marino e = rsa->e; 194f5b1c8a1SJohn Marino 195f5b1c8a1SJohn Marino BN_init(&n); 196f5b1c8a1SJohn Marino BN_with_flags(&n, rsa->n, BN_FLG_CONSTTIME); 197f5b1c8a1SJohn Marino 198f5b1c8a1SJohn Marino ret = BN_BLINDING_create_param(NULL, e, &n, ctx, rsa->meth->bn_mod_exp, 199f5b1c8a1SJohn Marino rsa->_method_mod_n); 200f5b1c8a1SJohn Marino 201f5b1c8a1SJohn Marino if (ret == NULL) { 202f5b1c8a1SJohn Marino RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); 203f5b1c8a1SJohn Marino goto err; 204f5b1c8a1SJohn Marino } 205f5b1c8a1SJohn Marino CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret)); 206f5b1c8a1SJohn Marino err: 207f5b1c8a1SJohn Marino BN_CTX_end(ctx); 208f5b1c8a1SJohn Marino if (in_ctx == NULL) 209f5b1c8a1SJohn Marino BN_CTX_free(ctx); 210f5b1c8a1SJohn Marino if (rsa->e == NULL) 211f5b1c8a1SJohn Marino BN_free(e); 212f5b1c8a1SJohn Marino 213f5b1c8a1SJohn Marino return ret; 214f5b1c8a1SJohn Marino } 215