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FishMarket 1.0
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FishMarket v1.0.iso
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fishies
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201-225
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disk_216
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wanderer
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src
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encrypt.c
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C/C++ Source or Header
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1992-05-06
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1KB
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55 lines
#include "wand_head.h"
/* Uses seeded random xor to encrypt because setkey doesnt work on our
system. */
/* this is the randon number seed */
#define BLURFL 32451 /* the word blurfl is used for historical reasons */
/* but it can be any nuber */
crypt_file(name)
char *name;
{
char buffer[1024];
int fd,length,loop;
if((fd = open(name,O_RDONLY)) == -1) {
endwin();
sprintf(buffer,"Wanderer: cannot open %s",name);
perror(buffer);
exit(1);
}
if((length = read(fd,buffer,1024)) < 1) {
endwin();
sprintf(buffer,"Wanderer: read error on %s",name);
perror(buffer);
exit(1);
}
close(fd);
/* Right, got it in here, now to encrypt the stuff */
addstr("Running crypt routine...\n");
refresh();
srand(BLURFL);
for(loop=0;loop<length;loop++)
buffer[loop]^=rand();
if((fd = open(name,O_WRONLY|O_TRUNC))== -1) {
endwin();
sprintf(buffer,"Wanderer: cannot write to %s",name);
perror(buffer);
exit(1);
}
if(write(fd,buffer,length)!=length) {
endwin();
sprintf(buffer,"Wanderer: write error on %s",name);
perror(buffer);
exit(1);
}
close(fd);
/* ok, file now contains encrypted/decrypted game. */
/* lets go back home... */
}