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Diffstat (limited to 'ssl/d1_enc.c')
| -rw-r--r-- | ssl/d1_enc.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/ssl/d1_enc.c b/ssl/d1_enc.c new file mode 100644 index 0000000000..8fa57347a9 --- /dev/null +++ b/ssl/d1_enc.c @@ -0,0 +1,293 @@ +/* ssl/d1_enc.c */ +/* + * 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 "ssl_locl.h" +#ifndef OPENSSL_NO_COMP +#include <openssl/comp.h> +#endif +#include <openssl/evp.h> +#include <openssl/hmac.h> +#include <openssl/md5.h> +#include <openssl/rand.h> +#ifdef KSSL_DEBUG +#include <openssl/des.h> +#endif + +int dtls1_enc(SSL *s, int send) + { + SSL3_RECORD *rec; + EVP_CIPHER_CTX *ds; + unsigned long l; + int bs,i,ii,j,k,n=0; + const EVP_CIPHER *enc; + + if (send) + { + if (EVP_MD_CTX_md(s->write_hash)) + { + n=EVP_MD_CTX_size(s->write_hash); + if (n < 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)) + { + n=EVP_MD_CTX_size(s->read_hash); + if (n < 0) + return -1; + } + 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); + } + +#ifdef KSSL_DEBUG + printf("dtls1_enc(%d)\n", send); +#endif /* KSSL_DEBUG */ + + 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; + if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) + { + if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) + j++; + } + for (k=(int)l; k<(int)(l+i); k++) + rec->input[k]=j; + l+=i; + rec->length+=i; + } + +#ifdef KSSL_DEBUG + { + unsigned long ui; + printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", + ds,rec->data,rec->input,l); + printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", + ds->buf_len, ds->cipher->key_len, + DES_KEY_SZ, DES_SCHEDULE_SZ, + ds->cipher->iv_len); + printf("\t\tIV: "); + for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); + printf("\n"); + printf("\trec->input="); + for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); + printf("\n"); + } +#endif /* KSSL_DEBUG */ + + if (!send) + { + if (l == 0 || l%bs != 0) + { + SSLerr(SSL_F_DTLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); + ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); + return 0; + } + } + + EVP_Cipher(ds,rec->data,rec->input,l); + +#ifdef KSSL_DEBUG + { + unsigned long i; + printf("\trec->data="); + for (i=0; i<l; i++) + printf(" %02x", rec->data[i]); printf("\n"); + } +#endif /* KSSL_DEBUG */ + + if ((bs != 1) && !send) + { + ii=i=rec->data[l-1]; /* padding_length */ + i++; + if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) + { + /* First packet is even in size, so check */ + if ((memcmp(s->s3->read_sequence, + "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) + s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; + if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) + i--; + } + /* TLS 1.0 does not bound the number of padding bytes by the block size. + * All of them must have value 'padding_length'. */ + if (i > (int)rec->length) + { + /* Incorrect padding. SSLerr() and ssl3_alert are done + * by caller: we don't want to reveal whether this is + * a decryption error or a MAC verification failure + * (see http://www.openssl.org/~bodo/tls-cbc.txt) + */ + return -1; + } + for (j=(int)(l-i); j<(int)l; j++) + { + if (rec->data[j] != ii) + { + /* Incorrect padding */ + return -1; + } + } + rec->length-=i; + + rec->data += bs; /* skip the implicit IV */ + rec->input += bs; + rec->length -= bs; + } + } + return(1); + } + |