22 lines
765 B
Markdown
22 lines
765 B
Markdown
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---
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id: apdu_changepin
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title: CHANGE PIN
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---
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# CHANGE PIN
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* CLA = 0x80
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* INS = 0x21
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* P1 = PIN identifier
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* P2 = 0x00
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* Data = the new PIN
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* Response SW = 0x9000 on success, 0x6A80 if the PIN format is invalid, 0x6A86 if P1 is invalid
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* Preconditions: Secure Channel must be opened, user PIN must be verified
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Used to change a PIN or secret. In case of invalid format, the code 0x6A80 is returned. If the conditions match, the PIN or secret is updated. The no-error SW 0x9000 is returned.
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P1:
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* 0x00: User PIN. Must be 6-digits. The updated PIN is authenticated for the rest of the session.
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* 0x01: Applet PUK. Must be 12-digits.
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* 0x02: Pairing secret. Must be 32-bytes long. Existing pairings are not broken, but new pairings will need to use the new secret.
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