openssl dgst -sha256 -hmac a1#2b <<< $(echo "dream")
42db96e0f488adad0557b547333e3d114e394600f90cb999bf2e37b3a426e539
openssl dgst -sha256 -hmac a1#2b <<< "dream\ndream"
5211e52c6fd47714ad46e456639c9e8ef640c0376154d572b4a171b187def67d
##
echo -n "dream" | openssl sha256 -hmac "a1#2b"
4489e030744a6346c43bb47707cf51b3b64bf3619acede4558832e568d0f40da
