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Generate private and public keys, and create JWT and JWKs
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| #!/bin/sh | |
| ## Requires openssl, nodejs, jq | |
| header=' | |
| { | |
| "kid": "12345", | |
| "alg": "RS256" | |
| }' | |
| payload=' | |
| { | |
| "iss": "https://example.com", | |
| "sub": "user-id-123", | |
| "aud": "client-app-id-123", | |
| "exp": 1735689600, | |
| "iat": 1563980400 | |
| }' | |
| function pack() { | |
| # Remove line breaks and spaces | |
| echo $1 | sed -e "s/[\r\n]\+//g" | sed -e "s/ //g" | |
| } | |
| if [ ! -f private-key.pem ]; then | |
| # Private and Public keys | |
| openssl genrsa 2048 > private-key.pem | |
| openssl rsa -in private-key.pem -pubout -out public-key.pem | |
| fi | |
| # Base64 Encoding | |
| b64_header=$(pack "$header" | openssl enc -e -A -base64) | |
| b64_payload=$(pack "$payload" | openssl enc -e -A -base64) | |
| signature=$(echo -n $b64_header.$b64_payload | openssl dgst -sha256 -sign private-key.pem | openssl enc -e -A -base64) | |
| # Export JWT | |
| echo $b64_header.$b64_payload.$signature > jwt.txt | |
| # Create JWK from public key | |
| if [ ! -d ./node_modules/pem-jwk ]; then | |
| # A tool to convert PEM to JWK | |
| npm install pem-jwk | |
| fi | |
| jwk=$(./node_modules/.bin/pem-jwk public-key.pem) | |
| # Add additional fields | |
| jwk=$(echo '{"use":"sig"}' $jwk $header | jq -cs add) | |
| # Export JWK | |
| echo '{"keys":['$jwk']}'| jq . > jwks.json | |
| echo "--- JWT ---" | |
| cat jwt.txt | |
| echo -e "\n--- JWK ---" | |
| jq . jwks.json |
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