brp_Desfire_AuthExtKey()

brp_errcode brp_Desfire_AuthExtKey	(	brp_protocol	protocol,
		brp_Desfire_AuthExtKey_SecureMessaging	SecureMessaging,
		unsigned	DesKeyNr,
		brp_Desfire_AuthExtKey_CryptoMode	CryptoMode,
		brp_buf	Key,
		size_t	Key_len
	)

This command authenticates a card with the reader, similarly to the Desfire.Authenticate command, but uses an external authentication key provided as a parameter. Allowed are keys with a length of 8, 16 and 24 Byte.

• 8 Byte keys are always DES keys.
• 16 Byte keys can be DES and AES keys.
• 24 Byte keys are only used for 3K3DES encryption.

Parameters

[in]	protocol	used to execute the command
[in]	SecureMessaging	Sets the secure messaging mode.
[in]	DesKeyNr	DESFire key number (0-13).
[in]	CryptoMode	Sets the encryption algorithm.
[in]	Key	Key to use for authentication
[in]	Key_len