Cryptography

JoyID is a multichain, cross-platform, passwordless and mnemonic-free wallet solution based on FIDO WebAuthn protocol and Nervos CKB. This post shows how to verify the signature from the method signChallenge of the @joyid/ckb package. The method reference page has a demo. I use the demo to obtain an example response then verify the response using the OpenSSL command line and the Python library PyCryptodome. The JoyID follows the WebAuthn specification and employs secp256r1 for signing. Although the guide references section 6.3.3 of the WebAuthn specification, titled “The authenticatorGetAssertion Operation”, I discovered that the example in this repository provided me much more helps.