Created
September 5, 2012 17:01
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Save rietta/3640002 to your computer and use it in GitHub Desktop.
Easy command line random hash generator for Mac OS X, Linux, and FreeBSD.
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| #!/bin/sh | |
| head -n 4096 /dev/urandom | openssl sha1 |
This is a really useful snippet. Thank you for sharing 👍
Even fancier:
% head -n 4096 /dev/urandom | openssl sha1 | awk '{print $2}' | cut -c1-6
a87a72
In your ~/.zshrc:
alias rsha='head -n 4096 /dev/urandom | openssl sha1 | awk "{print \$2}" | cut -c1-6'
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sha224 was invented for exactly this “shorter hash” purpose. This is a hash function with a 224-bit output, which NIST defined in order to “match” (administratively speaking) the proclaimed 112-bit security of 3DES. They defined SHA-224 by taking SHA-256, changing the conventional IV, and truncating the output. For the truncation, they took the first 224 bits. See also: https://csrc.nist.gov/publications/detail/fips/180/4/final
$ head -n 4096 /dev/urandom | openssl sha224
05cac32284221f1a2f9218d12c121f298dbc18f8e589da5023c69a43