3. CMOX_CCM

3.1. CCM single-call algorithms

group CMOX_CCM_ALGO

Variables

const cmox_aead_algo_t CMOX_AESSMALL_CCM_ENC_ALGO

Identifier of the CCM encryption using AES (small implementation) for single-call function (Defined internally).

const cmox_aead_algo_t CMOX_AESSMALL_CCM_DEC_ALGO

Identifier of the CCM decryption using AES (small implementation) for single-call function (Defined internally).

const cmox_aead_algo_t CMOX_AESFAST_CCM_ENC_ALGO

Identifier of the CCM encryption using AES (fast implementation) for single-call function (Defined internally).

const cmox_aead_algo_t CMOX_AESFAST_CCM_DEC_ALGO

Identifier of the CCM decryption using AES (fast implementation) for single-call function (Defined internally).

3.2. CCM implementations

group CMOX_CCM_IMPL

Variables

const cmox_ccm_impl_t CMOX_AESFAST_CCM_ENC

Implementation of CCM encryption using AES (fast implementation) (Defined internally).

const cmox_ccm_impl_t CMOX_AESFAST_CCM_DEC

Implementation of CCM decryption using AES (fast implementation) (Defined internally).

const cmox_ccm_impl_t CMOX_AESSMALL_CCM_ENC

Implementation of CCM encryption using AES (small implementation) (Defined internally).

const cmox_ccm_impl_t CMOX_AESSMALL_CCM_DEC

Implementation of CCM decryption using AES (small implementation) (Defined internally).

3.3. CCM public method prototypes

group CMOX_CCM_PUBLIC_METHODS

Functions

cmox_cipher_handle_t * cmox_ccm_construct ( cmox_ccm_handle_t * P_pThis , cmox_ccm_impl_t P_impl )

CCM constructor.

The function is used for specifying which block cipher algorithm to use in order to implement the CCM algorithm and if the algorithm will be used for encryption or decryption.

Parameters :

• P_pThis – Pointer to the CCM handle to initialize

• P_impl – Constant that specifies the implementation to use. This parameter can be one of the following values:

  • CMOX_AESFAST_CCM_ENC

  • CMOX_AESFAST_CCM_DEC

  • CMOX_AESSMALL_CCM_ENC

  • CMOX_AESSMALL_CCM_DEC

Returns :

cmox_cipher_handle_t* Pointer to a general cipher handle. This will be used by the general purpose cipher functions in order to perform the algorithm

3.4. CCM public types

group CMOX_CCM_PUBLIC_TYPES

Typedefs

typedef const struct cmox_ccm_implStruct_st * cmox_ccm_impl_t

CCM mode implementation.

This type specifies the used block cipher for the CCM construct and if the algorithm will be used for encryption or decryption. This type is defined as a pointer to a structure, that contains the functions needed for the specific implementation, defined in the library internally

struct cmox_ccm_handle_t

#include <cmox_ccm.h>

CCM handle structure.

Public Members

cmox_cipher_handle_t super

General cipher handle

cmox_blockcipher_handle_t blockCipher

Block cipher handle

uint32_t ivCtr [ 4 ]

Current IV value for encryption.

uint32_t ivCbc [ 4 ]

Current IV value for authentication.

size_t tagLen

Size of the tag to return. Possible values are values are {4,6,8,10,12,14,16}

size_t AdLen

Len of the associated data to be processed

size_t payloadLen

Size of the total payload data to be processed

size_t nonceLen

Size of the Nonce in bytes. Possible values are {7,8,9,10,11,12,13}

uint32_t tmpBuf [ 4 ]

Temporary buffer used for internal computations

uint32_t tmpBufUse

Number of bytes in use for internal computations