fix: update openssl script according to new info

openssl_signing_console.sh

@@ -7,16 +7,14 @@
 # Usage: source ./openssl_signing_console.sh
 #
 # For a more complete explanation, see ./openssl_signing_console.rst
-#
-# It's crazy that raw execution only works about 20% of the time!
-# See https://stackoverflow.com/questions/77505582/why-would-openssl-verify-succeed-every-time-with-source-but-fail-80-of-the
 
 
+# Generate a key and extract the public part
 openssl ecparam -name secp256k1 -genkey -noout -out private.pem
 openssl ec -in private.pem -pubout -out public.pem
 
+# Use test data
 header='{"alg":"ES256K", "issuer": "", "typ":"JWT"}'
-
 payload='{"@context": "http://schema.org", "@type": "PlanAction", "identifier": "did:ethr:0xb86913f83A867b5Ef04902419614A6FF67466c12", "name": "Test", "description": "Me"}'
 
 header_b64=$(echo -n "$header" | jq -c -M . | tr -d '\n' | base64 | tr -d '=' | tr '+' '-' | tr '/' '_')
@@ -24,13 +22,11 @@ payload_b64=$(echo -n "$payload" | jq -c -M . | tr -d '\n' | base64 | tr -d '='
 
 signing_input="$header_b64.$payload_b64"
 
-signature=$(echo -n "$signing_input" | openssl dgst -sha256 -sign private.pem)
+signature=$(echo -n "$signing_input" | openssl dgst -sha256 -sign private.pem | openssl base64 -e)
+
+echo -n "$signing_input" | openssl dgst -sha256 -verify public.pem -signature <(echo -n "$signature" | openssl base64 -d)
 
-echo -n "$signing_input" | openssl dgst -sha256 -verify public.pem -signature <(echo -n "$signature")
 
-# Also tested this, to no avail.
-#echo -n "$signature" > sig.out
-#echo -n "$signing_input" | openssl dgst -sha256 -verify public.pem -signature sig.out