Generating a SHA-256 hash from the Linux command line

Question

I know the string \"foobar\" generates the SHA-256 hash c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2 using http://hash.online-convert.com/sh

Answer 1

For the sha256 hash in base64, use:

echo -n foo | openssl dgst -binary -sha1 | openssl base64

Example

echo -n foo | openssl dgst -binary -sha1 | openssl base64
C+7Hteo/D9vJXQ3UfzxbwnXaijM=