Re: /dev/random vs. /dev/urandom

[Robert Love]

On Fri, 2005-01-07 at 14:05 -0500, Ron Peterson wrote:

>     read( fd, dat, RAND_LEN );
>     for( i = 0; i < RAND_LEN; i++ ) {
>       dat[i] = (dat[i] & 0x07) + '0';
>     }

Your problem is probably because read() need not actually read RAND_LEN
bytes.  Particularly with /dev/random, since it will only return bytes
up to the entropy estimate.  But you assume it read RAND_LEN, when those
are unread.  And possibly zero.  So that is probably your bug.

The AND makes zero sense, either.

Just use dd(1).

	Robert Love


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