secretOrPrivateKey size error when size is larger enough

从 node_modules/jsonwebtoken/sign.js:130 开始，然后跟踪通过 universal-github-app-jwt/dist-src/get-token.js 和 @octokit/auth-app/dist-src/get-app-authentication.js 传递的密钥。比较成功运行和失败运行中的密钥材料与输入，因为报告称该失败是间歇性的。当不同的行为可以复现，并且已确定其原因及解决方案时，即视为完成。

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