Use crypto/ecdh #60
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Use crypto/ecdh #60
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This new test mocks both the user agent (e.g. browser) and the push service (e.g. Firestore) to verify that encryption and decryption works properly. I used the RFCs as reference (RFC8291, RFC8292 & RFC 8188), but didn't follow them to the letter. The result can successfully check all the signatures and decrypt the content, so it seems to be working. Instead of the deprecated crypto/elliptic functions, this makes heavy use of crypto/ecdh, which require Go 1.20. But this is only a test dependency, library users should not be impacted.
crypto/elliptic is subject for removal soon, use of crypto/ecdh is advised
instead.
This has a number of side-effects:
- the required Go version increases to Go 1.20
- the configured VAPID keys get verified now, and invalid keys are rejected
- this necessitated changes to some tests
- VAPID is effectively mandatory now (but all push services I know require it
anyway)
go.mod has been updated to reflect the new requirement, and I ran `go mod tidy`
to clean up go.sum.
I also added additional error context by wrapping errors with fmt.Errorf's %w
verb. This was introduced in Go 1.13.
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This is a followup to #59. crypto/elliptic is deprecated, so I migrated to crypto/ecdh instead.
This may necessitate a major version bump, as Go 1.20 is now required, and VAPID keys are effectively mandatory. See commit message for additional information.