diff options
Diffstat (limited to 'lib/libssl/src/crypto/rsa/rsa_eay.c')
| -rw-r--r-- | lib/libssl/src/crypto/rsa/rsa_eay.c | 888 |
1 files changed, 0 insertions, 888 deletions
diff --git a/lib/libssl/src/crypto/rsa/rsa_eay.c b/lib/libssl/src/crypto/rsa/rsa_eay.c deleted file mode 100644 index 2facd1c6f6a..00000000000 --- a/lib/libssl/src/crypto/rsa/rsa_eay.c +++ /dev/null @@ -1,888 +0,0 @@ -/* $OpenBSD: rsa_eay.c,v 1.42 2016/07/07 11:53:12 bcook Exp $ */ -/* 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.] - */ -/* ==================================================================== - * 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). - * - */ - -#include <stdio.h> -#include <string.h> - -#include <openssl/opensslconf.h> - -#include <openssl/bn.h> -#include <openssl/err.h> -#include <openssl/rsa.h> - -static int RSA_eay_public_encrypt(int flen, const unsigned char *from, - unsigned char *to, RSA *rsa, int padding); -static int RSA_eay_private_encrypt(int flen, const unsigned char *from, - unsigned char *to, RSA *rsa, int padding); -static int RSA_eay_public_decrypt(int flen, const unsigned char *from, - unsigned char *to, RSA *rsa, int padding); -static int RSA_eay_private_decrypt(int flen, const unsigned char *from, - unsigned char *to, RSA *rsa, int padding); -static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx); -static int RSA_eay_init(RSA *rsa); -static int RSA_eay_finish(RSA *rsa); - -static RSA_METHOD rsa_pkcs1_eay_meth = { - .name = "Eric Young's PKCS#1 RSA", - .rsa_pub_enc = RSA_eay_public_encrypt, - .rsa_pub_dec = RSA_eay_public_decrypt, /* signature verification */ - .rsa_priv_enc = RSA_eay_private_encrypt, /* signing */ - .rsa_priv_dec = RSA_eay_private_decrypt, - .rsa_mod_exp = RSA_eay_mod_exp, - .bn_mod_exp = BN_mod_exp_mont, /* XXX probably we should not use Montgomery if e == 3 */ - .init = RSA_eay_init, - .finish = RSA_eay_finish, -}; - -const RSA_METHOD * -RSA_PKCS1_SSLeay(void) -{ - return &rsa_pkcs1_eay_meth; -} - -static int -RSA_eay_public_encrypt(int flen, const unsigned char *from, unsigned char *to, - RSA *rsa, int padding) -{ - BIGNUM *f, *ret; - int i, j, k, num = 0, r = -1; - unsigned char *buf = NULL; - BN_CTX *ctx = NULL; - - if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_MODULUS_TOO_LARGE); - return -1; - } - - if (BN_ucmp(rsa->n, rsa->e) <= 0) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE); - return -1; - } - - /* for large moduli, enforce exponent limit */ - if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS) { - if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE); - return -1; - } - } - - if ((ctx = BN_CTX_new()) == NULL) - goto err; - - BN_CTX_start(ctx); - f = BN_CTX_get(ctx); - ret = BN_CTX_get(ctx); - num = BN_num_bytes(rsa->n); - buf = malloc(num); - - if (f == NULL || ret == NULL || buf == NULL) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, ERR_R_MALLOC_FAILURE); - goto err; - } - - switch (padding) { - case RSA_PKCS1_PADDING: - i = RSA_padding_add_PKCS1_type_2(buf, num, from, flen); - break; -#ifndef OPENSSL_NO_SHA - case RSA_PKCS1_OAEP_PADDING: - i = RSA_padding_add_PKCS1_OAEP(buf, num, from, flen, NULL, 0); - break; -#endif - case RSA_SSLV23_PADDING: - i = RSA_padding_add_SSLv23(buf, num, from, flen); - break; - case RSA_NO_PADDING: - i = RSA_padding_add_none(buf, num, from, flen); - break; - default: - RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, - RSA_R_UNKNOWN_PADDING_TYPE); - goto err; - } - if (i <= 0) - goto err; - - if (BN_bin2bn(buf, num, f) == NULL) - goto err; - - if (BN_ucmp(f, rsa->n) >= 0) { - /* usually the padding functions would catch this */ - RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, - RSA_R_DATA_TOO_LARGE_FOR_MODULUS); - goto err; - } - - 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; - - if (!rsa->meth->bn_mod_exp(ret, f,rsa->e, rsa->n, ctx, - rsa->_method_mod_n)) - goto err; - - /* put in leading 0 bytes if the number is less than the - * length of the modulus */ - j = BN_num_bytes(ret); - i = BN_bn2bin(ret, &(to[num - j])); - for (k = 0; k < num - i; k++) - to[k] = 0; - - r = num; -err: - if (ctx != NULL) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - if (buf != NULL) { - explicit_bzero(buf, num); - free(buf); - } - return r; -} - -static BN_BLINDING * -rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx) -{ - BN_BLINDING *ret; - int got_write_lock = 0; - CRYPTO_THREADID cur; - - CRYPTO_r_lock(CRYPTO_LOCK_RSA); - - if (rsa->blinding == NULL) { - CRYPTO_r_unlock(CRYPTO_LOCK_RSA); - CRYPTO_w_lock(CRYPTO_LOCK_RSA); - got_write_lock = 1; - - if (rsa->blinding == NULL) - rsa->blinding = RSA_setup_blinding(rsa, ctx); - } - - ret = rsa->blinding; - if (ret == NULL) - goto err; - - CRYPTO_THREADID_current(&cur); - if (!CRYPTO_THREADID_cmp(&cur, BN_BLINDING_thread_id(ret))) { - /* rsa->blinding is ours! */ - *local = 1; - } else { - /* resort to rsa->mt_blinding instead */ - /* - * Instruct rsa_blinding_convert(), rsa_blinding_invert() - * that the BN_BLINDING is shared, meaning that accesses - * require locks, and that the blinding factor must be - * stored outside the BN_BLINDING - */ - *local = 0; - - if (rsa->mt_blinding == NULL) { - if (!got_write_lock) { - CRYPTO_r_unlock(CRYPTO_LOCK_RSA); - CRYPTO_w_lock(CRYPTO_LOCK_RSA); - got_write_lock = 1; - } - - if (rsa->mt_blinding == NULL) - rsa->mt_blinding = RSA_setup_blinding(rsa, ctx); - } - ret = rsa->mt_blinding; - } - -err: - if (got_write_lock) - CRYPTO_w_unlock(CRYPTO_LOCK_RSA); - else - CRYPTO_r_unlock(CRYPTO_LOCK_RSA); - return ret; -} - -static int -rsa_blinding_convert(BN_BLINDING *b, BIGNUM *f, BIGNUM *unblind, BN_CTX *ctx) -{ - if (unblind == NULL) - /* - * Local blinding: store the unblinding factor - * in BN_BLINDING. - */ - return BN_BLINDING_convert_ex(f, NULL, b, ctx); - else { - /* - * Shared blinding: store the unblinding factor - * outside BN_BLINDING. - */ - int ret; - CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING); - ret = BN_BLINDING_convert_ex(f, unblind, b, ctx); - CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING); - return ret; - } -} - -static int -rsa_blinding_invert(BN_BLINDING *b, BIGNUM *f, BIGNUM *unblind, BN_CTX *ctx) -{ - /* - * For local blinding, unblind is set to NULL, and BN_BLINDING_invert_ex - * will use the unblinding factor stored in BN_BLINDING. - * If BN_BLINDING is shared between threads, unblind must be non-null: - * BN_BLINDING_invert_ex will then use the local unblinding factor, - * and will only read the modulus from BN_BLINDING. - * In both cases it's safe to access the blinding without a lock. - */ - return BN_BLINDING_invert_ex(f, unblind, b, ctx); -} - -/* signing */ -static int -RSA_eay_private_encrypt(int flen, const unsigned char *from, unsigned char *to, - RSA *rsa, int padding) -{ - BIGNUM *f, *ret, *res; - int i, j, k, num = 0, r = -1; - unsigned char *buf = NULL; - BN_CTX *ctx = NULL; - int local_blinding = 0; - /* - * Used only if the blinding structure is shared. A non-NULL unblind - * instructs rsa_blinding_convert() and rsa_blinding_invert() to store - * the unblinding factor outside the blinding structure. - */ - BIGNUM *unblind = NULL; - BN_BLINDING *blinding = NULL; - - if ((ctx = BN_CTX_new()) == NULL) - goto err; - - BN_CTX_start(ctx); - f = BN_CTX_get(ctx); - ret = BN_CTX_get(ctx); - num = BN_num_bytes(rsa->n); - buf = malloc(num); - - if (f == NULL || ret == NULL || buf == NULL) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); - goto err; - } - - switch (padding) { - case RSA_PKCS1_PADDING: - i = RSA_padding_add_PKCS1_type_1(buf, num, from, flen); - break; - case RSA_X931_PADDING: - i = RSA_padding_add_X931(buf, num, from, flen); - break; - case RSA_NO_PADDING: - i = RSA_padding_add_none(buf, num, from, flen); - break; - case RSA_SSLV23_PADDING: - default: - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, - RSA_R_UNKNOWN_PADDING_TYPE); - goto err; - } - if (i <= 0) - goto err; - - if (BN_bin2bn(buf, num, f) == NULL) - goto err; - - if (BN_ucmp(f, rsa->n) >= 0) { - /* usually the padding functions would catch this */ - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, - RSA_R_DATA_TOO_LARGE_FOR_MODULUS); - goto err; - } - - if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) { - blinding = rsa_get_blinding(rsa, &local_blinding, ctx); - if (blinding == NULL) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, - ERR_R_INTERNAL_ERROR); - goto err; - } - } - - if (blinding != NULL) { - if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, - ERR_R_MALLOC_FAILURE); - goto err; - } - if (!rsa_blinding_convert(blinding, f, unblind, ctx)) - goto err; - } - - if ((rsa->flags & RSA_FLAG_EXT_PKEY) || - (rsa->p != NULL && rsa->q != NULL && rsa->dmp1 != NULL && - rsa->dmq1 != NULL && rsa->iqmp != NULL)) { - if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) - goto err; - } else { - BIGNUM d; - - BN_init(&d); - BN_with_flags(&d, rsa->d, 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; - - if (!rsa->meth->bn_mod_exp(ret, f, &d, rsa->n, ctx, - rsa->_method_mod_n)) { - goto err; - } - } - - if (blinding) - if (!rsa_blinding_invert(blinding, ret, unblind, ctx)) - goto err; - - if (padding == RSA_X931_PADDING) { - BN_sub(f, rsa->n, ret); - if (BN_cmp(ret, f) > 0) - res = f; - else - res = ret; - } else - res = ret; - - /* put in leading 0 bytes if the number is less than the - * length of the modulus */ - j = BN_num_bytes(res); - i = BN_bn2bin(res, &(to[num - j])); - for (k = 0; k < num - i; k++) - to[k] = 0; - - r = num; -err: - if (ctx != NULL) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - if (buf != NULL) { - explicit_bzero(buf, num); - free(buf); - } - return r; -} - -static int -RSA_eay_private_decrypt(int flen, const unsigned char *from, unsigned char *to, - RSA *rsa, int padding) -{ - BIGNUM *f, *ret; - int j, num = 0, r = -1; - unsigned char *p; - unsigned char *buf = NULL; - BN_CTX *ctx = NULL; - int local_blinding = 0; - /* - * Used only if the blinding structure is shared. A non-NULL unblind - * instructs rsa_blinding_convert() and rsa_blinding_invert() to store - * the unblinding factor outside the blinding structure. - */ - BIGNUM *unblind = NULL; - BN_BLINDING *blinding = NULL; - - if ((ctx = BN_CTX_new()) == NULL) - goto err; - - BN_CTX_start(ctx); - f = BN_CTX_get(ctx); - ret = BN_CTX_get(ctx); - num = BN_num_bytes(rsa->n); - buf = malloc(num); - - if (!f || !ret || !buf) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_MALLOC_FAILURE); - goto err; - } - - /* This check was for equality but PGP does evil things - * and chops off the top '0' bytes */ - if (flen > num) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, - RSA_R_DATA_GREATER_THAN_MOD_LEN); - goto err; - } - - /* make data into a big number */ - if (BN_bin2bn(from, (int)flen, f) == NULL) - goto err; - - if (BN_ucmp(f, rsa->n) >= 0) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, - RSA_R_DATA_TOO_LARGE_FOR_MODULUS); - goto err; - } - - if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) { - blinding = rsa_get_blinding(rsa, &local_blinding, ctx); - if (blinding == NULL) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, - ERR_R_INTERNAL_ERROR); - goto err; - } - } - - if (blinding != NULL) { - if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, - ERR_R_MALLOC_FAILURE); - goto err; - } - if (!rsa_blinding_convert(blinding, f, unblind, ctx)) - goto err; - } - - /* do the decrypt */ - if ((rsa->flags & RSA_FLAG_EXT_PKEY) || - (rsa->p != NULL && rsa->q != NULL && rsa->dmp1 != NULL && - rsa->dmq1 != NULL && rsa->iqmp != NULL)) { - if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) - goto err; - } else { - BIGNUM d; - - BN_init(&d); - BN_with_flags(&d, rsa->d, 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; - - if (!rsa->meth->bn_mod_exp(ret, f, &d, rsa->n, ctx, - rsa->_method_mod_n)) { - goto err; - } - } - - if (blinding) - if (!rsa_blinding_invert(blinding, ret, unblind, ctx)) - goto err; - - p = buf; - j = BN_bn2bin(ret, p); /* j is only used with no-padding mode */ - - switch (padding) { - case RSA_PKCS1_PADDING: - r = RSA_padding_check_PKCS1_type_2(to, num, buf, j, num); - break; -#ifndef OPENSSL_NO_SHA - case RSA_PKCS1_OAEP_PADDING: - r = RSA_padding_check_PKCS1_OAEP(to, num, buf, j, num, NULL, 0); - break; -#endif - case RSA_SSLV23_PADDING: - r = RSA_padding_check_SSLv23(to, num, buf, j, num); - break; - case RSA_NO_PADDING: - r = RSA_padding_check_none(to, num, buf, j, num); - break; - default: - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, - RSA_R_UNKNOWN_PADDING_TYPE); - goto err; - } - if (r < 0) - RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, - RSA_R_PADDING_CHECK_FAILED); - -err: - if (ctx != NULL) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - if (buf != NULL) { - explicit_bzero(buf, num); - free(buf); - } - return r; -} - -/* signature verification */ -static int -RSA_eay_public_decrypt(int flen, const unsigned char *from, unsigned char *to, - RSA *rsa, int padding) -{ - BIGNUM *f, *ret; - int i, num = 0, r = -1; - unsigned char *p; - unsigned char *buf = NULL; - BN_CTX *ctx = NULL; - - if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_MODULUS_TOO_LARGE); - return -1; - } - - if (BN_ucmp(rsa->n, rsa->e) <= 0) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE); - return -1; - } - - /* for large moduli, enforce exponent limit */ - if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS) { - if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE); - return -1; - } - } - - if ((ctx = BN_CTX_new()) == NULL) - goto err; - - BN_CTX_start(ctx); - f = BN_CTX_get(ctx); - ret = BN_CTX_get(ctx); - num = BN_num_bytes(rsa->n); - buf = malloc(num); - - if (!f || !ret || !buf) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, ERR_R_MALLOC_FAILURE); - goto err; - } - - /* This check was for equality but PGP does evil things - * and chops off the top '0' bytes */ - if (flen > num) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, - RSA_R_DATA_GREATER_THAN_MOD_LEN); - goto err; - } - - if (BN_bin2bn(from, flen, f) == NULL) - goto err; - - if (BN_ucmp(f, rsa->n) >= 0) { - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, - RSA_R_DATA_TOO_LARGE_FOR_MODULUS); - goto err; - } - - 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; - - if (!rsa->meth->bn_mod_exp(ret, f, rsa->e, rsa->n, ctx, - rsa->_method_mod_n)) - goto err; - - if (padding == RSA_X931_PADDING && (ret->d[0] & 0xf) != 12) - if (!BN_sub(ret, rsa->n, ret)) - goto err; - - p = buf; - i = BN_bn2bin(ret, p); - - switch (padding) { - case RSA_PKCS1_PADDING: - r = RSA_padding_check_PKCS1_type_1(to, num, buf, i, num); - break; - case RSA_X931_PADDING: - r = RSA_padding_check_X931(to, num, buf, i, num); - break; - case RSA_NO_PADDING: - r = RSA_padding_check_none(to, num, buf, i, num); - break; - default: - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, - RSA_R_UNKNOWN_PADDING_TYPE); - goto err; - } - if (r < 0) - RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, - RSA_R_PADDING_CHECK_FAILED); - -err: - if (ctx != NULL) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - if (buf != NULL) { - explicit_bzero(buf, num); - free(buf); - } - return r; -} - -static int -RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) -{ - BIGNUM *r1, *m1, *vrfy; - BIGNUM dmp1, dmq1, c, pr1; - int ret = 0; - - BN_CTX_start(ctx); - r1 = BN_CTX_get(ctx); - m1 = BN_CTX_get(ctx); - vrfy = BN_CTX_get(ctx); - if (r1 == NULL || m1 == NULL || vrfy == NULL) { - RSAerr(RSA_F_RSA_EAY_MOD_EXP, ERR_R_MALLOC_FAILURE); - goto err; - } - - { - BIGNUM p, q; - - /* - * Make sure BN_mod_inverse in Montgomery intialization uses the - * BN_FLG_CONSTTIME flag - */ - BN_init(&p); - BN_init(&q); - BN_with_flags(&p, rsa->p, BN_FLG_CONSTTIME); - BN_with_flags(&q, rsa->q, BN_FLG_CONSTTIME); - - if (rsa->flags & RSA_FLAG_CACHE_PRIVATE) { - if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_p, - CRYPTO_LOCK_RSA, &p, ctx) || - !BN_MONT_CTX_set_locked(&rsa->_method_mod_q, - CRYPTO_LOCK_RSA, &q, ctx)) { - goto err; - } - } - } - - 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; - - /* compute I mod q */ - BN_init(&c); - BN_with_flags(&c, I, BN_FLG_CONSTTIME); - - if (!BN_mod(r1, &c, rsa->q, ctx)) - goto err; - - /* compute r1^dmq1 mod q */ - BN_init(&dmq1); - BN_with_flags(&dmq1, rsa->dmq1, BN_FLG_CONSTTIME); - - if (!rsa->meth->bn_mod_exp(m1, r1, &dmq1, rsa->q, ctx, - rsa->_method_mod_q)) - goto err; - - /* compute I mod p */ - BN_with_flags(&c, I, BN_FLG_CONSTTIME); - - if (!BN_mod(r1, &c, rsa->p, ctx)) - goto err; - - /* compute r1^dmp1 mod p */ - BN_init(&dmp1); - BN_with_flags(&dmp1, rsa->dmp1, BN_FLG_CONSTTIME); - - if (!rsa->meth->bn_mod_exp(r0, r1, &dmp1, rsa->p, ctx, - rsa->_method_mod_p)) - goto err; - - if (!BN_sub(r0, r0, m1)) - goto err; - - /* - * This will help stop the size of r0 increasing, which does - * affect the multiply if it optimised for a power of 2 size - */ - if (BN_is_negative(r0)) - if (!BN_add(r0, r0, rsa->p)) - goto err; - - if (!BN_mul(r1, r0, rsa->iqmp, ctx)) - goto err; - - /* Turn BN_FLG_CONSTTIME flag on before division operation */ - BN_init(&pr1); - BN_with_flags(&pr1, r1, BN_FLG_CONSTTIME); - - if (!BN_mod(r0, &pr1, rsa->p, ctx)) - goto err; - - /* - * If p < q it is occasionally possible for the correction of - * adding 'p' if r0 is negative above to leave the result still - * negative. This can break the private key operations: the following - * second correction should *always* correct this rare occurrence. - * This will *never* happen with OpenSSL generated keys because - * they ensure p > q [steve] - */ - if (BN_is_negative(r0)) - if (!BN_add(r0, r0, rsa->p)) - goto err; - if (!BN_mul(r1, r0, rsa->q, ctx)) - goto err; - if (!BN_add(r0, r1, m1)) - goto err; - - if (rsa->e && rsa->n) { - if (!rsa->meth->bn_mod_exp(vrfy, r0, rsa->e, rsa->n, ctx, - rsa->_method_mod_n)) - goto err; - /* - * If 'I' was greater than (or equal to) rsa->n, the operation - * will be equivalent to using 'I mod n'. However, the result of - * the verify will *always* be less than 'n' so we don't check - * for absolute equality, just congruency. - */ - if (!BN_sub(vrfy, vrfy, I)) - goto err; - if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) - goto err; - if (BN_is_negative(vrfy)) - if (!BN_add(vrfy, vrfy, rsa->n)) - goto err; - if (!BN_is_zero(vrfy)) { - /* - * 'I' and 'vrfy' aren't congruent mod n. Don't leak - * miscalculated CRT output, just do a raw (slower) - * mod_exp and return that instead. - */ - BIGNUM d; - - BN_init(&d); - BN_with_flags(&d, rsa->d, BN_FLG_CONSTTIME); - - if (!rsa->meth->bn_mod_exp(r0, I, &d, rsa->n, ctx, - rsa->_method_mod_n)) { - goto err; - } - } - } - ret = 1; -err: - BN_CTX_end(ctx); - return ret; -} - -static int -RSA_eay_init(RSA *rsa) -{ - rsa->flags |= RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE; - return 1; -} - -static int -RSA_eay_finish(RSA *rsa) -{ - BN_MONT_CTX_free(rsa->_method_mod_n); - BN_MONT_CTX_free(rsa->_method_mod_p); - BN_MONT_CTX_free(rsa->_method_mod_q); - - return 1; -} |