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#!/bin/bash
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# Generate a JWT, with signature verified using OpenSSL
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#
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# Prerequisites: openssl, jq
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#
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# Usage: source ./openssl_signing_console.sh
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#
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# For a more complete explanation, see ./openssl_signing_console.rst
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#
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# It's crazy that raw execution only works about 20% of the time!
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# See https://stackoverflow.com/questions/77505582/why-would-openssl-verify-succeed-every-time-with-source-but-fail-80-of-the
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openssl ecparam -name secp256k1 -genkey -noout -out private.pem
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openssl ec -in private.pem -pubout -out public.pem
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header='{"alg":"ES256K", "issuer": "", "typ":"JWT"}'
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payload='{"@context": "http://schema.org", "@type": "PlanAction", "identifier": "did:ethr:0xb86913f83A867b5Ef04902419614A6FF67466c12", "name": "Test", "description": "Me"}'
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header_b64=$(echo -n "$header" | jq -c -M . | tr -d '\n' | base64 | tr -d '=' | tr '+' '-' | tr '/' '_')
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payload_b64=$(echo -n "$payload" | jq -c -M . | tr -d '\n' | base64 | tr -d '=' | tr '+' '-' | tr '/' '_')
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signing_input="$header_b64.$payload_b64"
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signature=$(echo -n "$signing_input" | openssl dgst -sha256 -sign private.pem)
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echo -n "$signing_input" | openssl dgst -sha256 -verify public.pem -signature <(echo -n "$signature")
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# Also tested this, to no avail.
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#echo -n "$signature" > sig.out
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#echo -n "$signing_input" | openssl dgst -sha256 -verify public.pem -signature sig.out
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# Read binary signature and encode it to Base64 URL-Safe format
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signature_b64=$(echo -n "$signature" | base64 | tr -d '=' | tr '+' '-' | tr '/' '_')
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# Construct the JWT
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jwt="$signing_input.$signature_b64"
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echo Resulting JWT: $jwt
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