Allow authentication caller to provide raw hashed challenge #13
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Some uses of FIDO2 authentication do not use a hashed JSON challenge, but instead their own data blob that is SHA256 hashed in the same fashion. An example of this is the use of FIDO2 keys with SSH. Provide a mechanism for indicating that the caller has already calculated the hash. Tested with a Go SSH/FIDO2 agent implementation.
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Some uses of FIDO2 authentication do not use a hashed JSON challenge, but instead their own data blob that is SHA256 hashed in the same fashion. An example of this is the use of FIDO2 keys with SSH. Provide a mechanism for indicating that the caller has already calculated the hash.
Tested with a Go SSH/FIDO2 agent implementation.