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42 lines
741 B
C
42 lines
741 B
C
/* $OpenLDAP$ */
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/*
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* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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#include "portable.h"
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#include <fcntl.h>
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#include <lutil.h>
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/*
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* lutil_entropy() provides nbytes of entropy in buf.
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* Quality offerred is suitable for one-time uses, such as "once" keys.
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*/
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int lutil_entropy( char *buf, int nbytes )
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{
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if( nbytes < 0 ) return -1;
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if( nbytes == 0 ) return 0;
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#ifdef URANDOM_DEVICE
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/* Linux and *BSD offer a urandom device */
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{
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int rc, fd;
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fd = open( URANDOM_DEVICE, O_RDONLY );
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if( fd < 0 ) return -1;
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rc = read( fd, buf, nbytes );
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close(fd);
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/* should return nbytes */
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if( rc < nbytes ) return -1;
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return 0;
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}
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#endif
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return -1;
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}
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