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.

Answer 1

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.

Answer 2

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

Explanation

Sending data (mydata in this case) to STDOUT:

echo -n mydata

-n flag remove new line (\n) from output.

Calculating SHA-1 via OpenSSL:

 openssl dgst -sha1

However, this command displays the SHA-1 in HEX mode, and for binary, the -binary flag needs to be added:

openssl dgst -binary -sha1

Convert SHA-1 to Base-64:

openssl base64

Answer 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?