rand_key.c

来自「Netscape公司提供的安全套接字层」· C语言 代码 · 共 41 行

/* rand_key.c */
/* Copyright (C) 1993 Eric Young - see README for more details */
#include "des_locl.h"

int des_random_key(ret)
des_cblock ret;
    {
    des_key_schedule ks;
    static unsigned long c=0;
    static unsigned short pid=0;
    static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
    des_cblock key;
    unsigned char *p;
    unsigned long t;

#ifdef MSDOS
    pid=1;
#else
    if (!pid) pid=getpid();
#endif
    p=key;
    t=(unsigned long)time(NULL);
    l2c(t,p);
    t=(unsigned long)((pid)|((c++)<<16));
    l2c(t,p);

    des_set_odd_parity((des_cblock *)data);
    des_set_key((des_cblock *)data,ks);
    des_cbc_cksum((des_cblock *)key,(des_cblock *)key,
        (long)sizeof(key),ks,(des_cblock *)data);
    des_set_odd_parity((des_cblock *)key);
    des_cbc_cksum((des_cblock *)key,(des_cblock *)key,
        (long)sizeof(key),ks,(des_cblock *)data);

    bcopy(key,ret,sizeof(key));
    bzero(key,sizeof(key));
    bzero(ks,sizeof(ks));
    t=0;
    return(0);
    }