Generate File and Checksum with pseudo-random Content and Size in Bash

s=1G bs=16K; count=`units ${s}iB ${bs}iB -1 -t --out="%.f"`; openssl enc -aes-256-ctr -pass pass:`date +%s%N` -nosalt < /dev/zero 2>/dev/null | dd iflag=fullblock bs=$bs count=$count | tee $s | pv -s $s | md5sum | sed -e "s/-/$s/" > ${s}.md5
Create a file with random binary content. Required pv, units packages. It use openssl to encrypt zeros using aes-256 and time stamp as password to generate a pseudo-random file.
Sample Output
e.g. size=1G will generate 2 file:
1G
1G.md5

You can check file with
md5sum -c 1G.md5

0
By: jcppkkk
2015-09-30 06:27:39

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