how to get sha1sum to output binary?

Question

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.

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 '13 at 23:47

score 11 · Answer 1 · answered Oct 19 '18 at 10:57

11

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.

answered Oct 19 '18 at 10:57

Jari Turkia

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Beautiful! This _also_ works flawlessly under macOS Big Sur Beta (in late 2020). – Gwyneth Llewelyn Oct 23 '20 at 19:00

score 3 · Accepted Answer · edited Mar 20 '17 at 10:17

3

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?

edited Mar 20 '17 at 10:17

Community

1

answered May 30 '13 at 23:47

BillThor

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Seyed M · Answer 3 · 2021-06-08T12:33:31.897

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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

edited Jun 08 '21 at 12:33

answered Jun 08 '21 at 10:10

Seyed M

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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](https://meta.stackexchange.com/questions/148272), because they don't teach the solution. – DavidPostill Jun 08 '21 at 12:13

how to get sha1sum to output binary?

3 Answers3