Functions
void	expandKey (UINT8 expandedKey, UINT8 key)
	expend a 16 bytes key for AES128 implementation More...

UINT8	galois_mul2 (UINT8 value)
	multiply by 2 in the galois field More...

void	aes_encr (UINT8 state, UINT8 expandedKey)
	internal implementation of AES128 encryption. straight forward aes encryption implementation first the group of operations More...

void	aes_decr (UINT8 state, UINT8 expandedKey)
	internal implementation of AES128 decryption. straight forward aes decryption implementation the order of substeps is the exact reverse of decryption inverse functions: More...

void	aes_encrypt (UINT8 state, UINT8 key)
	AES128 encryption: Given AES128 key and 16 bytes plain text, cipher text of 16 bytes is computed. The AES implementation is in mode ECB (Electronic Code Book). More...

void	aes_decrypt (UINT8 state, UINT8 key)
	AES128 decryption: Given AES128 key and 16 bytes cipher text, plain text of 16 bytes is computed The AES implementation is in mode ECB (Electronic Code Book). More...

INT32	aes_read_key (UINT8 *key)
	Reads AES128 key from EEPROM Reads the AES128 key from fileID #12 in EEPROM returns an error if the key does not exist. More...

INT32	aes_write_key (UINT8 *key)
	writes AES128 key from EEPROM Writes the AES128 key to fileID #12 in EEPROM More...

Variables
const UINT8	sbox [256]

const UINT8	rsbox [256]

const UINT8	Rcon [11]

UINT8	expandedKey [176]

Detailed Description

Function Documentation

void aes_decr	(	UINT8 *	state,
		UINT8 *	expandedKey
	)

internal implementation of AES128 decryption. straight forward aes decryption implementation the order of substeps is the exact reverse of decryption inverse functions:

aes_decr

Parameters

[in]	expandedKey	expanded AES128 key
	in\out]	state 16 bytes of cipher text and plain text

Returns

none

      - addRoundKey is its own inverse
      - rsbox is inverse of sbox
      - rightshift instead of leftshift
      - invMixColumns = barreto + mixColumns
     no further subfunctions to save cycles for function calls
     no structuring with "for (....)" to save cycles

void aes_decrypt	(	UINT8 *	state,
		UINT8 *	key
	)

AES128 decryption: Given AES128 key and 16 bytes cipher text, plain text of 16 bytes is computed The AES implementation is in mode ECB (Electronic Code Book).

aes_decrypt

Parameters

[in]	key	AES128 key of size 16 bytes
	in\out]	state 16 bytes of cipher text and plain text

Returns: none

void aes_encr	(	UINT8 *	state,
		UINT8 *	expandedKey
	)

internal implementation of AES128 encryption. straight forward aes encryption implementation first the group of operations

aes_encr

Parameters

[in]	expandedKey	expanded AES128 key
	in/out]	state 16 bytes of plain text and cipher text

Returns

none

    - addRoundKey
    - subbytes
    - shiftrows
    - mixcolums
    is executed 9 times, after this addroundkey to finish the 9th 
    round, after that the 10th round without mixcolums
    no further subfunctions to save cycles for function calls
    no structuring with "for (....)" to save cycles.

void aes_encrypt	(	UINT8 *	state,
		UINT8 *	key
	)

AES128 encryption: Given AES128 key and 16 bytes plain text, cipher text of 16 bytes is computed. The AES implementation is in mode ECB (Electronic Code Book).

aes_encrypt

Parameters

[in]	key	AES128 key of size 16 bytes
	in\out]	state 16 bytes of plain text and cipher text

Returns: none

INT32 aes_read_key ( UINT8 * key )

Reads AES128 key from EEPROM Reads the AES128 key from fileID #12 in EEPROM returns an error if the key does not exist.

aes_read_key

Parameters

[out] key AES128 key of size 16 bytes

Returns: on success 0, error otherwise.

INT32 aes_write_key ( UINT8 * key )

writes AES128 key from EEPROM Writes the AES128 key to fileID #12 in EEPROM

aes_write_key

Parameters

[out] key AES128 key of size 16 bytes

Returns: on success 0, error otherwise.

void expandKey	(	UINT8 *	expandedKey,
		UINT8 *	key
	)

expend a 16 bytes key for AES128 implementation

expandKey

Parameters

key	AES128 key - 16 bytes
expandedKey	expanded AES128 key

Returns: none

UINT8 galois_mul2 ( UINT8 value )

multiply by 2 in the galois field

galois_mul2

Parameters

value argument to multiply

Returns: multiplied argument

Variable Documentation

const UINT8 Rcon[11]

Initial value:

= {

0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}

const UINT8 rsbox[256]

Initial value:

=
{ 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb
, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb
, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e
, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25
, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92
, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84
, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06
, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b
, 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73
, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e
, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b
, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4
, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f
, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef
, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61
, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d }

const UINT8 sbox[256]

Initial value:

=   { 
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation