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Title: Looking for an linux (or windows) offline SHA-256 binary calculator Post by: Zellko on June 17, 2018, 05:44:45 PM Hello guys,
Do you know any SHA-256 binary hash calculator, like this online one: https://cryptii.com/hash-function (https://cryptii.com/hash-function) The goal is to create my own seed from 256 bits generate with a dice, then to the binary sha-256 hash in order to find the last 8 bits (checksum) for my seed. For obvious security reasons, I want to use a old, offline computer using tails live-cd. Thanks, Title: Re: Looking for an linux (or windows) offline SHA-256 binary calculator Post by: achow101 on June 17, 2018, 06:33:01 PM You can use OpenSSL's hashing command (https://www.openssl.org/docs/man1.0.2/apps/dgst.html). Or you can write your bytes to a file (with a hex editor or something) and hash the file using sha256sum which comes standard in most linux distributions.
Title: Re: Looking for an linux (or windows) offline SHA-256 binary calculator Post by: RGBKey on June 18, 2018, 02:08:15 AM If you're using Windows and you'd rather not have to install any additional software, there's a certutil command available to calculate hashes (among other things).
To calculate a hash, do certutil -hashfile filename algorithm For example, certutil -hashfile image.png SHA256 The available hash algorithms are MD2, MD4, MD5, SHA1, SHA256, SHA384, and SHA512. Title: Re: Looking for an linux (or windows) offline SHA-256 binary calculator Post by: rpstatic on June 20, 2018, 05:48:55 AM I am not sure about tails, but under Ubuntu you can just use
Code: echo -n "Message" | sha256sum Don't forget the "-n" otherwise you will hash your message including a newline. |