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Annotation of researchv10no/cmd/descrypt/randblock.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     Generate a Truly Block 64-bit Block
                      3:  *     D.P.Mitchell  83/06/28.
                      4:  */
                      5: 
                      6: #include <stdio.h>
                      7: #include <sys/types.h>
                      8: #include <sys/stat.h>
                      9: #include "crypt.h"
                     10: 
                     11: char *volatile_file[] = {
                     12:        "/bin/echo",
                     13:        "/bin/sh",
                     14:        "/bin/cat",
                     15:        "/bin/ls",
                     16:        "/bin/stty",
                     17:        "/bin/date",
                     18:        "/bin/cat",
                     19:        "/bin/cc",
                     20:        "/etc/motd",
                     21:        "/etc/utmp",
                     22:        "/dev/kmem",
                     23:        "",
                     24: };
                     25: 
                     26: Block
                     27: rand_block()
                     28: {
                     29:        register i;
                     30:        Block block;
                     31:        struct stat buf;
                     32:        extern long time();
                     33: 
                     34:        block.left  ^= 0x9662f394;
                     35:        block.right ^= 0x9f17c55f;
                     36:        key_setup(&block, 0);
                     37:        block.right = NEXT(getpid() + (getuid() << 16));
                     38:        block.left = NEXT(time((long *)0));
                     39:        des(&block);
                     40:        for (i = 0; strlen(volatile_file[i]); i++) {
                     41:                if (stat(volatile_file[i], &buf) == -1)
                     42:                        continue;
                     43:                block.right ^= NEXT(buf.st_atime);
                     44:                block.left ^= NEXT(buf.st_mtime);
                     45:                des(&block);
                     46:        }
                     47:        return block;
                     48: }

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