NXP Semiconductors LCP43 Series, User Manual

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User manual Rev. 1.3 — 6 July 2012 48 of 1269
NXP Semiconductors
UM10503
Chapter 6: LPC43xx Security API
Table 23. Security API calls
Function Offset relative to
the API entry
point Description
aes_Init 0x00 Initialize AES engine
Parameter - void
Return - void
aes_SetMode 0x04 Defines AES engine operation mode
Parameter: unsigned cmd with values:
0 - ECB encode AES_API_CMD_ENCODE_ECB (if the
parts are not configured for encryption, using
aes_SetMode with this parameter returns an error)
1 - ECB decode AES_API_CMD_DECODE_ECB
2 - CBC encode AES_API_CMD_ENCODE_CBC (if the
parts are not configured for encryption, using
aes_SetMode with this parameter returns an error)
3 - CBC decode AES_API_CMD_DECODE_CBC
Return - unsigned: see general error codes.
aes_LoadKey1 0x08 Loads 128-bit AES user key 1
Parameter - void
Return - void
aes_LoadKey2 0x0C Loads 128-bit AES user key 2
Parameter - void
Return - void
aes_LoadKeyRNG 0x10 Loads randomly generated key in AES engine. To
update the RNG and load a new random number, use
the API call otp_GenRand before aes_LoadKeyRNG.
Parameter - void
Return - void
aes_LoadKeySW 0x14 Loads 128-bit AES software defined user key
Parameter - unsigned char *key(16 bytes)
Return - void
aes_LoadIV_SW 0x18 Loads 128-bit AES initialization vector
Parameter - unsigned char *iv(16 bytes)
Return - void
aes_LoadIV_IC 0x1C Loads 128-bit AES IC specific initialization vector, which
is used to decrypt a boot image.
Parameter - void
Return - void