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251 lines
9.9 KiB
251 lines
9.9 KiB
/* ssl/d1_enc.c */ |
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/* |
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* DTLS implementation written by Nagendra Modadugu |
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. |
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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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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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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 |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* openssl-core@openssl.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This product includes cryptographic software written by Eric Young |
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* (eay@cryptsoft.com). This product includes software written by Tim |
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* Hudson (tjh@cryptsoft.com). |
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* |
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*/ |
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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 "ssl_locl.h" |
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#ifndef OPENSSL_NO_COMP |
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# include <openssl/comp.h> |
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#endif |
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#include <openssl/evp.h> |
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#include <openssl/hmac.h> |
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#include <openssl/md5.h> |
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#include <openssl/rand.h> |
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#ifdef KSSL_DEBUG |
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# include <openssl/des.h> |
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#endif |
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/*- |
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* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. |
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* |
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* Returns: |
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* 0: (in non-constant time) if the record is publically invalid (i.e. too |
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* short etc). |
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* 1: if the record's padding is valid / the encryption was successful. |
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* -1: if the record's padding/AEAD-authenticator is invalid or, if sending, |
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* an internal error occured. |
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*/ |
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int dtls1_enc(SSL *s, int send) |
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{ |
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SSL3_RECORD *rec; |
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EVP_CIPHER_CTX *ds; |
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unsigned long l; |
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int bs, i, j, k, mac_size = 0; |
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const EVP_CIPHER *enc; |
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if (send) { |
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if (EVP_MD_CTX_md(s->write_hash)) { |
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mac_size = EVP_MD_CTX_size(s->write_hash); |
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if (mac_size < 0) |
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return -1; |
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} |
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ds = s->enc_write_ctx; |
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rec = &(s->s3->wrec); |
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if (s->enc_write_ctx == NULL) |
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enc = NULL; |
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else { |
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enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx); |
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if (rec->data != rec->input) |
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/* we can't write into the input stream */ |
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fprintf(stderr, "%s:%d: rec->data != rec->input\n", |
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__FILE__, __LINE__); |
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else if (EVP_CIPHER_block_size(ds->cipher) > 1) { |
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if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) |
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<= 0) |
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return -1; |
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} |
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} |
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} else { |
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if (EVP_MD_CTX_md(s->read_hash)) { |
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mac_size = EVP_MD_CTX_size(s->read_hash); |
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OPENSSL_assert(mac_size >= 0); |
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} |
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ds = s->enc_read_ctx; |
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rec = &(s->s3->rrec); |
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if (s->enc_read_ctx == NULL) |
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enc = NULL; |
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else |
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enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx); |
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} |
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#ifdef KSSL_DEBUG |
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printf("dtls1_enc(%d)\n", send); |
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#endif /* KSSL_DEBUG */ |
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if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { |
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memmove(rec->data, rec->input, rec->length); |
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rec->input = rec->data; |
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} else { |
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l = rec->length; |
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bs = EVP_CIPHER_block_size(ds->cipher); |
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if ((bs != 1) && send) { |
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i = bs - ((int)l % bs); |
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/* Add weird padding of upto 256 bytes */ |
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/* we need to add 'i' padding bytes of value j */ |
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j = i - 1; |
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if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) { |
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if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) |
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j++; |
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} |
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for (k = (int)l; k < (int)(l + i); k++) |
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rec->input[k] = j; |
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l += i; |
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rec->length += i; |
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} |
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#ifdef KSSL_DEBUG |
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{ |
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unsigned long ui; |
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printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", |
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ds, rec->data, rec->input, l); |
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printf |
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("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", |
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ds->buf_len, ds->cipher->key_len, DES_KEY_SZ, |
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DES_SCHEDULE_SZ, ds->cipher->iv_len); |
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printf("\t\tIV: "); |
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for (i = 0; i < ds->cipher->iv_len; i++) |
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printf("%02X", ds->iv[i]); |
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printf("\n"); |
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printf("\trec->input="); |
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for (ui = 0; ui < l; ui++) |
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printf(" %02x", rec->input[ui]); |
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printf("\n"); |
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} |
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#endif /* KSSL_DEBUG */ |
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if (!send) { |
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if (l == 0 || l % bs != 0) |
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return 0; |
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} |
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if (EVP_Cipher(ds, rec->data, rec->input, l) < 1) |
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return -1; |
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#ifdef KSSL_DEBUG |
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{ |
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unsigned long i; |
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printf("\trec->data="); |
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for (i = 0; i < l; i++) |
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printf(" %02x", rec->data[i]); |
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printf("\n"); |
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} |
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#endif /* KSSL_DEBUG */ |
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if ((bs != 1) && !send) |
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return tls1_cbc_remove_padding(s, rec, bs, mac_size); |
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} |
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return (1); |
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}
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