| /* |
| * DTLS implementation written by Nagendra Modadugu |
| * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
| */ |
| /* ==================================================================== |
| * Copyright (c) 1998-2005 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). |
| * |
| */ |
| /* 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.] */ |
| |
| #include <stdio.h> |
| #include <assert.h> |
| |
| #include <openssl/evp.h> |
| #include <openssl/hmac.h> |
| #include <openssl/md5.h> |
| #include <openssl/rand.h> |
| |
| #include "ssl_locl.h" |
| |
| |
| /* dtls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. |
| * |
| * Returns: |
| * 0: (in non-constant time) if the record is publically invalid (i.e. too |
| * short etc). |
| * 1: if the record's padding is valid / the encryption was successful. |
| * -1: if the record's padding/AEAD-authenticator is invalid or, if sending, |
| * an internal error occured. */ |
| int dtls1_enc(SSL *s, int send) |
| { |
| SSL3_RECORD *rec; |
| EVP_CIPHER_CTX *ds; |
| unsigned long l; |
| int bs,i,j,k,mac_size=0; |
| const EVP_CIPHER *enc; |
| |
| if (send) |
| { |
| if (EVP_MD_CTX_md(s->write_hash)) |
| { |
| mac_size=EVP_MD_CTX_size(s->write_hash); |
| if (mac_size < 0) |
| return -1; |
| } |
| ds=s->enc_write_ctx; |
| rec= &(s->s3->wrec); |
| if (s->enc_write_ctx == NULL) |
| enc=NULL; |
| else |
| { |
| enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); |
| if ( rec->data != rec->input) |
| /* we can't write into the input stream */ |
| fprintf(stderr, "%s:%d: rec->data != rec->input\n", |
| __FILE__, __LINE__); |
| else if ( EVP_CIPHER_block_size(ds->cipher) > 1) |
| { |
| if (RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)) <= 0) |
| return -1; |
| } |
| } |
| } |
| else |
| { |
| if (EVP_MD_CTX_md(s->read_hash)) |
| { |
| mac_size=EVP_MD_CTX_size(s->read_hash); |
| assert(mac_size >= 0); |
| } |
| ds=s->enc_read_ctx; |
| rec= &(s->s3->rrec); |
| if (s->enc_read_ctx == NULL) |
| enc=NULL; |
| else |
| enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); |
| } |
| |
| if ((s->session == NULL) || (ds == NULL) || |
| (enc == NULL)) |
| { |
| memmove(rec->data,rec->input,rec->length); |
| rec->input=rec->data; |
| } |
| else |
| { |
| l=rec->length; |
| bs=EVP_CIPHER_block_size(ds->cipher); |
| |
| if ((bs != 1) && send) |
| { |
| i=bs-((int)l%bs); |
| |
| /* Add weird padding of upto 256 bytes */ |
| |
| /* we need to add 'i' padding bytes of value j */ |
| j=i-1; |
| for (k=(int)l; k<(int)(l+i); k++) |
| rec->input[k]=j; |
| l+=i; |
| rec->length+=i; |
| } |
| |
| if (!send) |
| { |
| if (l == 0 || l%bs != 0) |
| return 0; |
| } |
| |
| EVP_Cipher(ds,rec->data,rec->input,l); |
| |
| if ((bs != 1) && !send) |
| return tls1_cbc_remove_padding(s, rec, bs, mac_size); |
| } |
| return(1); |
| } |
| |