[PR] fix(jwt-auth): enforce algorithm match before signature verification [apisix]

["shreemaan-abhishek (via GitHub)" <gi...@apache.org>]

shreemaan-abhishek opened a new pull request, #13182:
URL: https://github.com/apache/apisix/pull/13182

   ## Summary
   
   - Enforce that the JWT header's `alg` claim matches the consumer's configured algorithm before performing signature verification, per RFC 8725 Section 2.1
   - Add nil guard on `jwt.header` before accessing `alg` to handle malformed tokens gracefully
   - Only log the expected algorithm in mismatch errors, avoiding untrusted values in log output
   - Add test coverage for algorithm mismatch rejection
   
   ## Test plan
   
   - [x] New test case (TEST 52 in `t/plugin/jwt-auth.t`): creates an RS256 consumer, submits a token with mismatched algorithm, asserts 401 rejection with correct error log
   - [x] `prove -I. -Itest-nginx/lib -r t/plugin/jwt-auth.t` passes


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Re: [PR] fix(jwt-auth): enforce algorithm match before signature verification [apisix]

["Baoyuantop (via GitHub)" <gi...@apache.org>]

Baoyuantop merged PR #13182:
URL: https://github.com/apache/apisix/pull/13182


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