Does webAuthn support signCount

Question

Created Aug ’22

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Hi, I'm trying to implement passkey into my app. I am wondering if ASAuthorizationPublicKeyCredentialAssertion.rawAuthenticatorData supports signCount. It seems the value is always 0.

Thank you!

Answered by Systems Engineer in 723508022

For security keys, this will contain whatever signCount the security key itself provided. For passkeys, signCount is not supported and will always be 0. That field isn't meaningful for a synced credential that can be used at any time from multiple devices.

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Answer 1

Systems Engineer OP

Apple

Aug ’22

Accepted Answer

For security keys, this will contain whatever signCount the security key itself provided. For passkeys, signCount is not supported and will always be 0. That field isn't meaningful for a synced credential that can be used at any time from multiple devices.

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Answer 2

cnliusen OP

Aug ’22

thank you!

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