diff options
Diffstat (limited to 'crypto/kerberosIV/appl/bsd/encrypt.c')
| -rw-r--r-- | crypto/kerberosIV/appl/bsd/encrypt.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/crypto/kerberosIV/appl/bsd/encrypt.c b/crypto/kerberosIV/appl/bsd/encrypt.c new file mode 100644 index 0000000..b74f329 --- /dev/null +++ b/crypto/kerberosIV/appl/bsd/encrypt.c @@ -0,0 +1,311 @@ +/* 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 "bsd_locl.h" + +RCSID("$Id: encrypt.c,v 1.3 1996/04/30 13:50:54 bg Exp $"); + +#undef BSIZE + +/* used in des_read and des_write */ +#define MAXWRITE (1024*16) +#define BSIZE (MAXWRITE+4) + +/* replacements for htonl and ntohl since I have no idea what to do + * when faced with machines with 8 byte longs. */ +#define HDRSIZE 4 + +#define n2l(c,l) (l =((u_int32_t)(*((c)++)))<<24, \ + l|=((u_int32_t)(*((c)++)))<<16, \ + l|=((u_int32_t)(*((c)++)))<< 8, \ + l|=((u_int32_t)(*((c)++)))) + +#define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \ + *((c)++)=(unsigned char)(((l)>>16)&0xff), \ + *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ + *((c)++)=(unsigned char)(((l) )&0xff)) + +/* This has some uglies in it but it works - even over sockets. */ +extern int errno; +int des_rw_mode=DES_PCBC_MODE; +int LEFT_JUSTIFIED = 0; + +int +des_enc_read(int fd, char *buf, int len, struct des_ks_struct *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]),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]),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) + des_pcbc_encrypt((des_cblock *)net,(des_cblock *)unnet, + num,sched,iv,DES_DECRYPT); + else + des_cbc_encrypt((des_cblock *)net,(des_cblock *)unnet, + num,sched,iv,DES_DECRYPT); + memcpy(buf,unnet,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) + des_pcbc_encrypt((des_cblock *)net, + (des_cblock *)tmpbuf, + num,sched,iv,DES_DECRYPT); + else + des_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 :-( */ + if (LEFT_JUSTIFIED || (len >= 8)) + memcpy(buf,tmpbuf,num); + else + memcpy(buf,tmpbuf+(8-num),num); /* Right justified */ + } + else if (num >= 8) + { + if (des_rw_mode & DES_PCBC_MODE) + des_pcbc_encrypt((des_cblock *)net, + (des_cblock *)buf,num,sched,iv, + DES_DECRYPT); + else + des_cbc_encrypt((des_cblock *)net, + (des_cblock *)buf,num,sched,iv, + DES_DECRYPT); + } + else + { + if (des_rw_mode & DES_PCBC_MODE) + des_pcbc_encrypt((des_cblock *)net, + (des_cblock *)buf,8,sched,iv, + DES_DECRYPT); + else + des_cbc_encrypt((des_cblock *)net, + (des_cblock *)buf,8,sched,iv, + DES_DECRYPT); + if (!LEFT_JUSTIFIED) + memcpy(buf, buf+(8-num), num); /* Right justified */ + } + } + return(num); +} + +int +des_enc_write(int fd, char *buf, int len, struct des_ks_struct *sched, des_cblock *iv) +{ + long rnum; + int i,j,k,outnum; + char outbuf[BSIZE+HDRSIZE]; + char shortbuf[8]; + char *p; + static int start=1; + + /* If we are sending less than 8 bytes, the same char will look + * the same if we don't pad it out with random bytes */ + if (start) + { + start=0; + srand(time(NULL)); + } + + /* lets recurse if we want to send the data in small chunks */ + if (len > MAXWRITE) + { + j=0; + for (i=0; i<len; i+=k) + { + k=des_enc_write(fd,&(buf[i]), + ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv); + if (k < 0) + return(k); + else + j+=k; + } + return(j); + } + + /* write length first */ + p=outbuf; + l2n(len,p); + + /* pad short strings */ + if (len < 8) + { + if (LEFT_JUSTIFIED) + { + p=shortbuf; + memcpy(shortbuf,buf,(unsigned int)len); + for (i=len; i<8; i++) + shortbuf[i]=rand(); + rnum=8; + } + else + { + p=shortbuf; + for (i=0; i<8-len; i++) + shortbuf[i]=rand(); + memcpy(shortbuf + 8 - len, buf, len); + rnum=8; + } + } + else + { + p=buf; + rnum=((len+7)/8*8); /* round up to nearest eight */ + } + + if (des_rw_mode & DES_PCBC_MODE) + des_pcbc_encrypt((des_cblock *)p,(des_cblock *)&(outbuf[HDRSIZE]), + (long)((len<8)?8:len),sched,iv,DES_ENCRYPT); + else + des_cbc_encrypt((des_cblock *)p,(des_cblock *)&(outbuf[HDRSIZE]), + (long)((len<8)?8:len),sched,iv,DES_ENCRYPT); + + /* output */ + outnum=rnum+HDRSIZE; + + for (j=0; j<outnum; j+=i) + { + /* eay 26/08/92 I was not doing writing from where we + * got upto. */ + i=write(fd,&(outbuf[j]),(unsigned int)(outnum-j)); + if (i == -1) + { + if (errno == EINTR) + i=0; + else /* This is really a bad error - very bad + * It will stuff-up both ends. */ + return(-1); + } + } + + return(len); +} |
