A question about largeBlobs

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czwm...@gmail.com

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Nov 29, 2021, 11:39:24 PM11/29/21
to FIDO Dev (fido-dev)
Hi
I have a question about the largeBlobs.
In the specification 2.1 section 6.1:

This command allows at least 1024 bytes of large blob data to be stored on CTAP2 authenticators. For the purposes of this command, this data is serialized as a CBOR-encoded array (called the large-blob array) of large-blob maps, concatenated with 16 following bytes. Those final 16 bytes are the truncated SHA-256 hash of the preceding bytes. This concatenation is referred to as the serialized large-blob array.

If  maxSerializedLargeBlobArray in the authenticatorGetInfo is 1024, so I just can write 1008 bytes data(the final 16 bytes are for hash value)?

thanks.

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