diff options
Diffstat (limited to 'secure/lib/libdes/enc_read.c')
| -rw-r--r-- | secure/lib/libdes/enc_read.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/secure/lib/libdes/enc_read.c b/secure/lib/libdes/enc_read.c new file mode 100644 index 0000000..11a6c5a --- /dev/null +++ b/secure/lib/libdes/enc_read.c @@ -0,0 +1,189 @@ +/* lib/des/enc_read.c */ +/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au) + * All rights reserved. + * + * This file is part of an SSL implementation written + * by Eric Young (eay@mincom.oz.au). + * The implementation was written so as to conform with Netscapes SSL + * specification. This library and applications are + * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE + * as long as the following conditions are aheared to. + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. If this code is used in a product, + * Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au) + * + * 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 <errno.h> +#include "des_locl.h" + +/* This has some uglies in it but it works - even over sockets. */ +extern int errno; +int des_rw_mode=DES_PCBC_MODE; + +int des_enc_read(fd, buf, len, sched, iv) +int fd; +char *buf; +int len; +des_key_schedule sched; +des_cblock (*iv); + { + /* data to be unencrypted */ + int net_num=0; + unsigned char net[BSIZE]; + /* extra unencrypted data + * for when a block of 100 comes in but is des_read one byte at + * a time. */ + static char unnet[BSIZE]; + static int unnet_start=0; + static int unnet_left=0; + int i; + long num=0,rnum; + unsigned char *p; + + /* left over data from last decrypt */ + if (unnet_left != 0) + { + if (unnet_left < len) + { + /* we still still need more data but will return + * with the number of bytes we have - should always + * check the return value */ + memcpy(buf,&(unnet[unnet_start]), + (unsigned int)unnet_left); + /* eay 26/08/92 I had the next 2 lines + * reversed :-( */ + i=unnet_left; + unnet_start=unnet_left=0; + } + else + { + memcpy(buf,&(unnet[unnet_start]),(unsigned int)len); + unnet_start+=len; + unnet_left-=len; + i=len; + } + return(i); + } + + /* We need to get more data. */ + if (len > MAXWRITE) len=MAXWRITE; + + /* first - get the length */ + net_num=0; + while (net_num < HDRSIZE) + { + i=read(fd,&(net[net_num]),(unsigned int)HDRSIZE-net_num); + if ((i == -1) && (errno == EINTR)) continue; + if (i <= 0) return(0); + net_num+=i; + } + + /* we now have at net_num bytes in net */ + p=net; + num=0; + n2l(p,num); + /* num should be rounded up to the next group of eight + * we make sure that we have read a multiple of 8 bytes from the net. + */ + if ((num > MAXWRITE) || (num < 0)) /* error */ + return(-1); + rnum=(num < 8)?8:((num+7)/8*8); + + net_num=0; + while (net_num < rnum) + { + i=read(fd,&(net[net_num]),(unsigned int)rnum-net_num); + if ((i == -1) && (errno == EINTR)) continue; + if (i <= 0) return(0); + net_num+=i; + } + + /* Check if there will be data left over. */ + if (len < num) + { + if (des_rw_mode & DES_PCBC_MODE) + pcbc_encrypt((des_cblock *)net,(des_cblock *)unnet, + num,sched,iv,DES_DECRYPT); + else + cbc_encrypt((des_cblock *)net,(des_cblock *)unnet, + num,sched,iv,DES_DECRYPT); + memcpy(buf,unnet,(unsigned int)len); + unnet_start=len; + unnet_left=num-len; + + /* The following line is done because we return num + * as the number of bytes read. */ + num=len; + } + else + { + /* >output is a multiple of 8 byes, if len < rnum + * >we must be careful. The user must be aware that this + * >routine will write more bytes than he asked for. + * >The length of the buffer must be correct. + * FIXED - Should be ok now 18-9-90 - eay */ + if (len < rnum) + { + char tmpbuf[BSIZE]; + + if (des_rw_mode & DES_PCBC_MODE) + pcbc_encrypt((des_cblock *)net, + (des_cblock *)tmpbuf, + num,sched,iv,DES_DECRYPT); + else + cbc_encrypt((des_cblock *)net, + (des_cblock *)tmpbuf, + num,sched,iv,DES_DECRYPT); + + /* eay 26/08/92 fix a bug that returned more + * bytes than you asked for (returned len bytes :-( */ + memcpy(buf,tmpbuf,(unsigned int)num); + } + else + { + if (des_rw_mode & DES_PCBC_MODE) + pcbc_encrypt((des_cblock *)net, + (des_cblock *)buf,num,sched,iv, + DES_DECRYPT); + else + cbc_encrypt((des_cblock *)net, + (des_cblock *)buf,num,sched,iv, + DES_DECRYPT); + } + } + return(num); + } + |
