b33abb44fd
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@171 ec53bebd-3082-4978-b11e-865c3cabbd6b
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* rand_key.c */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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#include "des_locl.h"
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int des_random_key(unsigned char *ret)
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{
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des_key_schedule ks;
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static u_int32_t c=0;
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static unsigned short pid=0;
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static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
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des_cblock key;
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unsigned char *p;
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u_int32_t t, now;
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now=(unsigned long)time(NULL);
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#ifdef MSDOS
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pid=1;
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#else
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if (!pid) pid=getpid();
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#endif
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try_again:
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p=key;
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t=now;
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l2c(t,p);
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t=(u_int32_t)((pid)|((c++)<<16));
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l2c(t,p);
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des_set_odd_parity((des_cblock *)data);
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des_set_key((des_cblock *)data,ks);
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des_cbc_cksum((des_cblock *)key,(des_cblock *)key,
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(long)sizeof(key),ks,(des_cblock *)data);
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des_set_odd_parity((des_cblock *)key);
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des_cbc_cksum((des_cblock *)key,(des_cblock *)key,
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(long)sizeof(key),ks,(des_cblock *)data);
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memcpy(ret,key,sizeof(key));
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memset(key,0,sizeof(key));
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memset(ks,0,sizeof(ks));
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t=0;
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/* random key must have odd parity and not be weak */
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des_set_odd_parity((des_cblock *)ret);
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if (des_is_weak_key((des_cblock *)ret)) goto try_again;
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return(0);
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}
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