MCP Inspector OAuth flow stucks at "Preparing Authorization": Cannot read properties of undefined (reading 'digest')

[RomanValov]

Describe the bug
Unable to complete OAuth2 flow due to error at "Preparing Authorization": Cannot read properties of undefined (reading 'digest')

To Reproduce
Steps to reproduce the behavior:

1. Enter SSE MCP address, i.e. "https://example.com/sse"
2. Press "Open Auth Settings" button
3. Press "Continue" button three times

Expected behavior
OAuth steps are passed

Logs

"index-CfNcvwpX.js:25968 OAuth flow error: TypeError: Cannot read properties of undefined (reading 'digest')
    at generateChallenge (index-CfNcvwpX.js:16204:46)
    at async pkceChallenge (index-CfNcvwpX.js:16214:21)
    at async startAuthorization (index-CfNcvwpX.js:16379:21)
    at async Object.execute (index-CfNcvwpX.js:16548:50)
    at async OAuthStateMachine.executeStep (index-CfNcvwpX.js:16624:5)
    at async index-CfNcvwpX.js:25966:7

Additional context

[RomanValov]

OAuth flow works fine if inspector web ui is available over HTTPS proto

[yokawasa]

I have the same error with the following:

• package: @modelcontextprotocol/inspector@0.16.2
• node: v22.17.0

I don't see the error with @modelcontextprotocol/inspector@0.15.0

[olaservo]

There's been updates to the auth flow since this issue was opened and I haven't been able to repro this issue with my own server. I'm going to close this one, but please feel free to re-open if there's still a bug we should address here. Thanks!