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149 lines
5.3 KiB
149 lines
5.3 KiB
/* crypto/rsa/rsa_ssl.c */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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#include <stdio.h> |
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#include "cryptlib.h" |
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#include <openssl/bn.h> |
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#include <openssl/rsa.h> |
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#include <openssl/rand.h> |
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int RSA_padding_add_SSLv23(unsigned char *to, int tlen, |
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const unsigned char *from, int flen) |
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{ |
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int i, j; |
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unsigned char *p; |
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if (flen > (tlen - 11)) { |
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RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23, |
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RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); |
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return (0); |
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} |
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p = (unsigned char *)to; |
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*(p++) = 0; |
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*(p++) = 2; /* Public Key BT (Block Type) */ |
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/* pad out with non-zero random data */ |
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j = tlen - 3 - 8 - flen; |
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if (RAND_bytes(p, j) <= 0) |
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return (0); |
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for (i = 0; i < j; i++) { |
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if (*p == '\0') |
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do { |
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if (RAND_bytes(p, 1) <= 0) |
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return (0); |
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} while (*p == '\0'); |
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p++; |
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} |
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memset(p, 3, 8); |
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p += 8; |
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*(p++) = '\0'; |
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memcpy(p, from, (unsigned int)flen); |
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return (1); |
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} |
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int RSA_padding_check_SSLv23(unsigned char *to, int tlen, |
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const unsigned char *from, int flen, int num) |
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{ |
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int i, j, k; |
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const unsigned char *p; |
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p = from; |
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if (flen < 10) { |
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL); |
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return (-1); |
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} |
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if ((num != (flen + 1)) || (*(p++) != 02)) { |
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02); |
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return (-1); |
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} |
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/* scan over padding data */ |
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j = flen - 1; /* one for type */ |
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for (i = 0; i < j; i++) |
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if (*(p++) == 0) |
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break; |
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if ((i == j) || (i < 8)) { |
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, |
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RSA_R_NULL_BEFORE_BLOCK_MISSING); |
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return (-1); |
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} |
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for (k = -9; k < -1; k++) { |
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if (p[k] != 0x03) |
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break; |
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} |
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if (k == -1) { |
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_SSLV3_ROLLBACK_ATTACK); |
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return (-1); |
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} |
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i++; /* Skip over the '\0' */ |
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j -= i; |
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if (j > tlen) { |
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_LARGE); |
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return (-1); |
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} |
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memcpy(to, p, (unsigned int)j); |
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return (j); |
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}
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