Output of file : ENCRPT.C contained in archive :
SUPER_C.ZIP /* Encrypt
This program encrypts the standard input and writes it to
the standard output. It requires one parameter: the key for
the encryption, which can be up to eight characters long.
Decryption is done by simply running the program again on the
encrypted file with the same key -- i.e., encryption and
decryption are the same operation.
*/
#include
#include
#include
#define BUFSIZE 20480 /* I/O buffer size. */
#define KEYSIZE 9 /* Maximum size of key (plus one for null). */
#define CALIBRATE /* Define for start/end prompts. */
char buffer[BUFSIZE]; /* The I/O buffer. */
#define STDINFILE 0 /* Standard input non-stream file number. */
#define STDOUTFILE 1 /* Standard output file number. */
#define TRUE 1
#define FALSE 0
/* main(argc,argv)
Function: Encrypt the standard input and write it to the
standard output, using the single command line parameter
as the key.
Algorithm: Get the key and rearrange it to improve security,
then encrypt using exclusive-or with the key.
*/
main(argc,argv)
int argc;
char *argv[];
{
char key[KEYSIZE]; /* The key. */
char *cp, *cp2;
char c;
/* Check if we've got the right number of command line
parameters. */
if (argc != 2) {
/* If not, remind him how to use this program. */
fputs("Usage: encrpt key <![CDATA[cipherText",stderr);<br />
exit(1);<br />
};<br />
<br />
/* Check if we've got a decent sized key. */<br />
if ((argv[1][0] == 0) || (argv[1][1] == 0)) {<br />
/* If not, tell him he needs a bigger key. */<br />
fputs("Key must be at least 2 characters in size.",stderr);<br />
exit(1);<br />
};<br />
<br />
/* Get the key. */<br />
for (cp = key, cp2 = argv[1];<br />
(cp < &key[KEYSIZE-1]) && (*cp2 != 0); *cp++ = *cp2++);<br />
/* Distribute the last byte amoung the top bits of the earlier<br />
ones, and toggle some of the bits in each key byte. All of<br />
this helps ensure a more secure key. */<br />
for (c = *(--cp), *cp = 0; cp >= key; cp--) {<br />
*cp |= (c & 1) << 7;<br />
*cp ^= 0x55;<br />
c >>= 1;<br />
};<br />
<br />
/* Use binary I/O mode. For two reasons: (1) We want to be<br />
able to encrypt binary files; (2) characters may be<br />
turned into LFs in the encryption process, which would<br />
erroneously be translated into CRLF. */<br />
setmode(STDINFILE,O_BINARY);<br />
setmode(STDOUTFILE,O_BINARY);<br />
<br />
/* Encrypt it. */<br />
#ifdef CALIBRATE<br />
fputs("Starting...",stderr);<br />
#endif CALIBRATE<br />
encrypt(STDINFILE,STDOUTFILE,key);<br />
#ifdef CALIBRATE<br />
fputs("done.\n",stderr);<br />
#endif CALIBRATE<br />
}<br />
<br />
/* encrypt(inFile,outFile,theKey)<br />
<br />
Function: Encrypt the file specified by inFile, using<br />
theKey, and write it to outFile.<br />
<br />
Algorithm: Exclusive-or the bytes with theKey, recycling<br />
theKey as needed.<br />
*/<br />
<br />
encrypt(inFile,outFile,theKey)<br />
<br />
int inFile;<br />
int outFile;<br />
char *theKey;<br />
<br />
{<br />
register char *keyPtr;<br />
register char *bufPtr;<br />
int bufCnt;<br />
int sizeRead;<br />
<br />
keyPtr = theKey;<br />
/* Cycle until nothing left to read. */<br />
while (TRUE) {<br />
/* Read in a bufferfull. */<br />
sizeRead = bufCnt = read(inFile,buffer,BUFSIZE);<br />
if (sizeRead <= 0) break;<br />
/* Encrypt it. */<br />
for (bufPtr = buffer; sizeRead-- > 0; *bufPtr++ ^= *keyPtr++)<br />
if (*keyPtr == 0) keyPtr = theKey;<br />
/* Write it out. */<br />
write(outFile,buffer,bufCnt);<br />
};<br />
}<br />
<br />
<br><br>
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<h3 class="comments"><span class="icon"> </span>
3 Responses to “Category : C Source Code<br>Archive   : SUPER_C.ZIP<br>Filename : ENCRPT.C<br>”</h3>
<ol class="commentlist">
<li id="comment-468" class="comment even thread-even depth-1 plain-nested">
<div id="div-comment-468" class="comment-body">
<div class="comment-author fix vcard">
<img alt='' src='https://secure.gravatar.com/avatar/8f76d6c77c12a5a1083dce633a326642?s=48&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/8f76d6c77c12a5a1083dce633a326642?s=96&d=mm&r=g 2x' class='avatar avatar-48 photo' height='48' width='48' decoding='async'/> <div class="comment-author-link">
<cite class="fn">Daniel</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://www.pcorner.com/list/#comment-468">
January 27, 2013 at 3:59 pm</a> </div>
</div>
<p>Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!</p>
</div>
<div class="reply">
</div>
</li><!-- #comment-## -->
<li id="comment-1491" class="comment odd alt thread-odd thread-alt depth-1 plain-nested">
<div id="div-comment-1491" class="comment-body">
<div class="comment-author fix vcard">
<img alt='' src='https://secure.gravatar.com/avatar/6b4f9d1304972a01f7c30ad1710ddc18?s=48&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/6b4f9d1304972a01f7c30ad1710ddc18?s=96&d=mm&r=g 2x' class='avatar avatar-48 photo' height='48' width='48' decoding='async'/> <div class="comment-author-link">
<cite class="fn">Joshie</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://www.pcorner.com/list/#comment-1491">
March 18, 2014 at 4:57 pm</a> </div>
</div>
<p>This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.</p>
</div>
<div class="reply">
</div>
</li><!-- #comment-## -->
<li id="comment-31187" class="comment even thread-even depth-1 plain-nested">
<div id="div-comment-31187" class="comment-body">
<div class="comment-author fix vcard">
<img alt='' src='https://secure.gravatar.com/avatar/e91d5d889b8284060613b258afef30f7?s=48&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/e91d5d889b8284060613b258afef30f7?s=96&d=mm&r=g 2x' class='avatar avatar-48 photo' height='48' width='48' decoding='async'/> <div class="comment-author-link">
<cite class="fn">DiskingRound</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://www.pcorner.com/list/#comment-31187">
January 14, 2015 at 10:57 pm</a> </div>
</div>
<p>But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: <a href="http://www.os2museum.com/wp/mtswslnk/" rel="nofollow ugc">http://www.os2museum.com/wp/mtswslnk/</a></p>
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