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secretOrPrivateKey size error when size is larger enough

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
javascript, nodejs

Research direction

Start at node_modules/jsonwebtoken/sign.js:130, then trace the key passed through universal-github-app-jwt/dist-src/get-token.js and @octokit/auth-app/dist-src/get-app-authentication.js. Compare the key material and inputs in successful and failing runs, since the report says the failure is intermittent. Done means the differing behavior is reproducible and its cause is identified with a resolution.

Written by the indexing model from the issue text.

Description

Description

I'm doing some development with octokit and probot which bring jsonwebtoken as a dependency. After updating octokit/auth-app to a version that supports jsonwebtoken 9.0.1, I'm getting this error:

"secretOrPrivateKey has a minimum key size of 2048 bits for RS256"

The private key used is definitely longer than 2048 bits, so I was not expecting to see this error.

Reproduction

Logs:

Error: secretOrPrivateKey has a minimum key size of 2048 bits for RS256 at Object.sign (/app/node_modules/jsonwebtoken/sign.js:130:22) at getToken (/app/node_modules/universal-github-app-jwt/dist-src/get-token.js:3:25) at Object.githubAppJwt (/app/node_modules/universal-github-app-jwt/dist-src/index.js:14:25) at getAppAuthentication (/app/node_modules/@octokit/auth-app/dist-src/get-app-authentication.js:4:41) at hook (/app/node_modules/@octokit/auth-app/dist-src/hook.js:18:33)

It's also strange that the issue only happens sometimes. For example, a previous commit didn't raise an error.

Environment
  • Version of this library used: 9.0.1
  • Version of the platform or framework used, if applicable: Node version 16
  • Other relevant versions (language, server software, OS, browser):
  • Other modules/plugins/libraries that might be involved: octokit/auth-app 4.0.8, universal-github-app-jwt 1.1.1, octokit-auth-probot 1.2.8
Dominant language
JavaScript
Stars
18.2k
Forks
1.3k
PR merge metrics
No merged PRs in 30d

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