IOCryptoAcceleratorFamily

IOCryptoAcceleratorFamily is a collection of kernel extensions that provide hardware-accelerated cryptographic functions, e.g. SHA1, AES, pseudo-random number generator (PRNG), etc.

You can use OpenSSL or CommonCrypto to do the same job without acceleration.

PRNG

Methods

Selector	Action	Input	Output
0	info	-	struct IOPRNGAcceleratorInfo (12 bytes)
1	perform	struct IOPRNGAcceleratorArg (8 bytes)	struct IOPRNGAcceleratorArg (8 bytes)

where

struct IOPRNGAcceleratorInfo {
  unsigned type;  // ='RND0'
  uint8_t  x78x50[4];
  void*    reserved;
};

struct IOPRNGAcceleratorArg {
  void* data;
  size_t length;
};

SHA-1

Methods

Selector	Action	Input	Output
0	info	-	24 bytes of stuff
1	perform	40 bytes of stuff	40 bytes of stuff

AES

Methods

Selector	Action	Input	Output
0	info	-	struct IOAESAcceleratorInfo (36 bytes)
1	perform	struct IOAESAcceleratorArg (72 bytes)	struct IOAESAcceleratorArg (72 bytes)
2	test	-	-

where

struct IOAESAcceleratorInfo {
  unsigned type;  // ='AES0'
  int      seven;
  uint8_t  x78x50[16];
  int      one_or_three;
  void*    reserved;
  unsigned x78x70;
};

struct IOAESAcceleratorArg {
  const void* in_data;
  void*       out_data;
  size_t      data_length;
  uint8_t     iv[16];
  bool        is_decrypt;
  int         aes_bits;  // 128, 224, 256
  uint8_t     key[32];
  int         special_keys;  // 1000 = gid-key, 2000 = uid-key, 2101 = securityd-key
};

PKE (Public key encryption)

Methods

Selector	Action	Input	Output
0	info	-	20 bytes of stuff
1	?	44 bytes of stuff	44 bytes of stuff
2	?	60 bytes of stuff	60 bytes of stuff