Safari partially supports AuthenticatorAttestationResponse.getPublicKey()#29458
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caugner merged 3 commits intoApr 22, 2026
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AuthenticatorAttestationResponse.getPublicKey() support status for SafariAuthenticatorAttestationResponse.getPublicKey()
caugner
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Apr 17, 2026
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@pilcrowonpaper Are you able to confirm whether Chrome and Firefox supports all three algorithm identifiers? |
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@caugner From manual testing, both Firefox and Chrome supports -8 (Ed25519). I don't have an authenticator that supports -257 (RS256), but looking at the source code, I believe Firefox supports it (via |
Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>
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@caugner Chromium seems to have a test that checks for all three algorithms so it should support -257 (RS256) as well. |
caugner
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Apr 22, 2026
This was referenced May 8, 2026
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Summary
Sets Safari's support for
AuthenticatorAttestationResponse.getPublicKey()topartial. The Web Authentication API specification (since level 2 where it was first described in) states that user agents MUST support algorithm -7 (ES256), -8 (Ed25519), and -257 (RS256). However, WebKit only supports -7 (ES256) and returnsnullfor the other 2 algorithms.Test results and supporting details