update the script commands for JWT signature generation & validation

openssl_signing_console.rst

@@ -1,8 +1,11 @@
-Prerequisites:
+JWT Creation & Verification
 
-jq 
+To run this in a script, see ./openssl_signing_console.sh
 
-You can create a JWT using a library or by encoding the header and payload base64Url and signing it with a secret using a ES256K algorithm. Here is an example of how you can create a JWT using the jq and openssl command line utilities:
+Prerequisites: openssl, jq
+
+You can create a JWT using a library or by encoding the header and payload base64Url and signing it with a secret using
+a ES256K algorithm. Here is an example of how you can create a JWT using the jq and openssl command line utilities:
 
 Here is an example of how you can use openssl to sign a JWT with the ES256K algorithm:
 
@@ -15,20 +18,22 @@ openssl ec -in private.pem -pubout -out public.pem
 
 header='{"alg":"ES256K", "issuer": "", "typ":"JWT"}'
 
-    Next, create a payload object as a JSON object containing the claims you want to include in the JWT. For example schema.org :
+    Next, create a payload object as a JSON object containing the claims you want to include in the JWT.
+    For example schema.org :
 
 payload='{"@context": "http://schema.org", "@type": "PlanAction", "identifier": "did:ethr:0xb86913f83A867b5Ef04902419614A6FF67466c12", "name": "Test", "description": "Me"}'
 
     Encode the header and payload objects as base64Url strings. You can use the jq command line utility to do this:
 
-header_b64=$(echo -n "$header" | jq -c -M . | tr -d '\n')
-payload_b64=$(echo -n "$payload" | jq -c -M . | tr -d '\n')
+header_b64=$(echo -n "$header" | jq -c -M . | tr -d '\n' | base64 | tr -d '=' | tr '+' '-' | tr '/' '_')
+payload_b64=$(echo -n "$payload" | jq -c -M . | tr -d '\n' | base64 | tr -d '=' | tr '+' '-' | tr '/' '_')
 
     Concatenate the encoded header, payload, and a secret to create the signing input:
 
 signing_input="$header_b64.$payload_b64"
 
-    Create the signature by signing the signing input with a ES256K algorithm and your secret. You can use the openssl command line utility to do this:
+    Create the signature by signing the signing input with a ES256K algorithm and your secret.
+    You can use the openssl command line utility to do this:
 
 signature=$(echo -n "$signing_input" | openssl dgst -sha256 -sign private.pem)
 
@@ -43,7 +48,7 @@ Authorization: Bearer $jwt
 
     To verify the JWT, you can use the openssl utility with the public key:
 
-openssl dgst -sha256 -verify public.pem -signature <(echo -n "$signature") "$signing_input"
-
-    This will verify the signature and output Verified OK if the signature is valid. If the signature is not valid, it will output an error.
+echo -n "$signing_input" | openssl dgst -sha256 -verify public.pem -signature <(echo -n "$signature")
 
+    This will verify the signature and output "Verified OK" if the signature is valid.
+    If the signature is not valid, it will give an error response and output "Verification failure".