github-starred/better-auth
2
0
Fork 0
mirror of https://github.com/better-auth/better-auth.git synced 2026-05-23 23:52:05 -05:00
Code Issues 2.5k Packages Projects Releases 112 Wiki Activity

[PR #8634] feat(oauth-provider): compute at_hash in id tokens per OIDC Core §3.1.3.6 #16353

New Issue
Open
opened 2026-04-13 10:30:04 -05:00 by GiteaMirror · 0 comments
GiteaMirror commented 2026-04-13 10:30:04 -05:00
Owner
Copy Link

Original Pull Request: https://github.com/better-auth/better-auth/pull/8634

State: open
Merged: No

Problem

OIDC Core §3.1.3.6 requires the at_hash claim in id_tokens when the token is issued alongside an access token from the authorization endpoint.

Changes

  • Compute at_hash server-side inside createIdToken — the access token is never exposed to customIdTokenClaims callbacks to prevent token leakage
  • Sequence id_token creation after access token creation so the access token string is available for hashing
  • Add computeOidcHash() that selects the correct hash algorithm based on the signing algorithm (EdDSA→SHA-512, RS/ES384→SHA-384, RS/ES512→SHA-512, else SHA-256)
  • Add base64url import from jose for the hash encoding

References

**Original Pull Request:** https://github.com/better-auth/better-auth/pull/8634 **State:** open **Merged:** No --- ## Problem OIDC Core §3.1.3.6 requires the `at_hash` claim in id_tokens when the token is issued alongside an access token from the authorization endpoint. ## Changes - Compute `at_hash` server-side inside `createIdToken` — the access token is never exposed to `customIdTokenClaims` callbacks to prevent token leakage - Sequence id_token creation after access token creation so the access token string is available for hashing - Add `computeOidcHash()` that selects the correct hash algorithm based on the signing algorithm (EdDSA→SHA-512, RS/ES384→SHA-384, RS/ES512→SHA-512, else SHA-256) - Add `base64url` import from `jose` for the hash encoding ## References - [OIDC Core §3.1.3.6 — ID Token `at_hash`](https://openid.net/specs/openid-connect-core-1_0.html#HybridIDToken)
GiteaMirror added the pull-request label 2026-04-13 10:30:04 -05:00
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
adapter
astro
awaiting external contributor
blocked
breaking
breaking change
bug
c-devops
core
credentials
database
dependencies
devops
devtools
docs
documentation
duplicate
elysia
enhancement
enterprise
expo
express
fastify
good first issue
help wanted
hono
identity
infra
integration
invalid
javascript
locked
maintenance
need-more-information
needs: info
needs: repro
nextjs
nuxt
oauth
organization
P0
payments
perf
platform
plugin
pull-request
Mirrored from GitHub Pull Request
 question
ready
regression
remix
security
social-provider
solid
stale
svelte
tanstack-start
tracking
version-bump
vue
wontfix
No Label pull-request
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
GiteaMirror ninjasurge
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: github-starred/better-auth#16353
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?