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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"setkey for HMAC results in IndexError","articleBody":"## Problem\r\nWhen trying to write a HMAC initialization vector to the OnlyKey,\r\nthe CLI returns `\u003cclass 'IndexError'\u003e` without further information.\r\n\r\n## Steps to reproduce\r\nThis issue occurs when following the example from the README (see [here](https://github.com/trustcrypto/python-onlykey?tab=readme-ov-file#examples)).\r\n\r\nThe exact CLI interaction is:\r\n```\r\n$ onlykey-cli\r\nOnlyKey CLI v1.2.10\r\nControl-D to exit.\r\n\r\nOnlyKey\u003e setkey HMAC1 h\r\n\r\nType Control-T to toggle password visible.\r\nPassword/Key: ****************************************\r\n\u003cclass 'IndexError'\u003e\r\nInput error. See available commands with examples here https://docs.crp.to/command-line.html\r\n```\r\n\r\n## Possible cause\r\nThe error appears to be thrown at [`only_key.setkey(slot_id, data[2], data[3], key)`](https://github.com/trustcrypto/python-onlykey/blob/master/onlykey/cli.py#L950C19-L950C72),  \r\nbecause `data[3]` is not set by above-mentioned CLI command.\r\n`data[3]` seems to be the value for `features`, which above-linked instructions for setting the HMAC key do not mention.\r\n\r\n---\r\nthanks in advance for looking into this!\r\n","author":{"url":"https://github.com/top-on","@type":"Person","name":"top-on"},"datePublished":"2024-01-15T10:59:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/76/python-onlykey/issues/76"}