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I need to base64 encode a binary sha1 hash. What is the best way to do this? I imagine this would involve piping binary data into base64. Unfortunately sha1sum does not have a binary output option. Any ideas?

This is what I need to do:

echo mydata|sha1sum --binary-output|base64

sha1sum does not have a --binary-output option though.

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    How did binary creep into this?
    – tink
    May 30, 2013 at 23:32
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    I believe that jcalfee314 is saying that he wants to base64 encode an actual SHA1 hash value, rather than the hex representation thereof that the sha1 program outputs.
    – Scott - Слава Україні
    May 30, 2013 at 23:47

3 Answers 3

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Try converting hex to base64. This answer is one option. There are a number of other implementations.

How can I convert from hex to base64?

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Maybe something like:

echo mydata | sha1sum | xxd -r -p | base64

... would solve your problem.

See https://unix.stackexchange.com/questions/82561/convert-a-hex-string-to-binary-and-send-with-netcat for similar question.

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    Beautiful! This also works flawlessly under macOS Big Sur Beta (in late 2020).
    – Gwyneth Llewelyn
    Oct 23, 2020 at 19:00
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You can use the openssl to CalculateSHA-1 and -binary output the digest in binary form.

Last piping convert binary-digest to Base-64.

echo -n mydata | openssl dgst -binary -sha1 | openssl base64
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    Could you please edit your answer to give an explanation of why this code answers the question? Code-only answers are discouraged, because they don't teach the solution.
    – DavidPostill ♦
    Jun 8, 2021 at 12:13

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