Detailed Description

AESCBC driver header.

============================================================================

Warning: This is a beta API. It may change in future releases.

Overview

The Cipher Block Chaining (CBC) mode of operation is a generic block cipher mode of operation. It can be used with any block cipher including AES.

CBC mode encrypts messages of any practical length that have a length evenly divisibly by the block size. Unlike ECB, it guarantees confidentiality of the entire message when the message is larger than one block.

Operation

In CBC encryption, the initialization vector (IV) is XOR'd with a block of plaintext and then encrypted. The output ciphertext block is then XOR'd with the next plaintext block and the result is encryped. This process is repeated until the final block of plaintext has been encrypted.

To decrypt the message, decrypt the first block of ciphertext and XOR the result with the IV. The result is the first plaintext block. For subsequent ciphertext blocks, decrypt each block and XOR the previous block of the encrypted message into the result.

Padding

CBC operates on entire blocks of ciphertext and plaintext at a time. This means that message lengths must be a multiple of the block cipher block size. AES has a block size of 16 bytes no matter the key size. Since messages do not necessarily always have a length that is a multiple of 16 bytes, it may be necessary to pad the message to a 16-byte boundary. Padding requires the sender and receiver to implicitly agree on the padding convention. Improperly designed or implemented padding schemes may leak information to an attacker through a padding oracle attack for example.

Initialization Vectors

The IV is generated by the party performing the encryption operation. Within the scope of any encryption key, the IV value must be unique. The IV does not need to be kept secret and is usually transmitted together with the ciphertext to the decryting party. In CBC mode, the IVs must not be predictable. Two recommended ways to generate IVs is to either:

Apply the block cipher (AESECB), using the same key used with CBC, to a nonce. This nonce must be unique for each key-message pair. A counter will usually suffice. If the same symmetric key is used by both parties to encrypt messages, they should agree to use a nonce scheme that avoids generating the same nonce and thus IV twice. Incrementing the counter by two and making one party use even numbers and the other odd numbers is a common method to avoid such collisions.
Use a TRNG (True Random Number Generator) or PRNG (Pseudo-Random Number Generator) to generate a random number for use as IV.

Drawbacks

CBC mode has several drawbacks. Unless interfacing with legacy devices, it is recommended to use an AEAD (Authenticated Encryption with Associated Data) mode such as CCM or GCM. Below is a non-exhaustive list of reasons to use a different block cipher mode of operation.

CBC mode does not offer authentication or integrity guarantees. In practice, this means that attackers can intercept the encrypted message and manipulate the ciphertext before sending the message on to the receiver. While this does not break confidentiality and reveal the plaintext, it has enabled several attacks in the past. This is especially problematic given that changing the ciphertext of a block will only corrupt the block itself and the subsequent block of resultant plaintext. This property may be used to manipulate only certain parts of the message.
CBC mode requires message lengths to be evenly divisible by the block size. This necessitates a padding scheme. Improperly implemented padding schemes may lead to vulnerabilities that can be exploited by attackers. It often makes more sense to use a dedicated stream cipher such as CTR (Counter) that does not have this restriction. CCM and GCM both use CTR for encryption.

Usage

Before starting a CBC operation

Before starting a CBC operation, the application must do the following:

Call AESCBC_init() to initialize the driver
Call AESCBC_Params_init() to initialize the AESCBC_Params to default values.
Modify the AESCBC_Params as desired
Call AESCBC_open() to open an instance of the driver
Initialize a CryptoKey. These opaque data structures are representations of keying material and its storage. Depending on how the keying material is stored (RAM or flash, key store, key blob), the CryptoKey must be initialized differently. The AESCBC API can handle all types of CryptoKey. However, not all device-specific implementions support all types of CryptoKey. Devices without a key store will not support CryptoKeys with keying material stored in a key store for example. All devices support plaintext CryptoKeys.
Initialise the AESCBC_Operation using AESCBC_Operation_init() and set all length, key, and buffer fields.

Starting a CBC operation

The AESCBC_oneStepEncrypt and AESCBC_oneStepDecrypt functions perform a CBC operation in a single call. They will always be the most highly optimized routines with the least overhead and the fastest runtime. However, they require all plaintext or ciphertext to be available to the function at the start of the call. All devices support single call operations.

After the CBC operation completes

After the CBC operation completes, the application should either start another operation or close the driver by calling AESCBC_close().

AESCBC Driver Configuration

In order to use the AESCBC APIs, the application is required to provide device-specific AESCBC configuration in the Board.c file. The AESCBC driver interface defines a configuration data structure:

typedef struct AESCBC_Config_ {
    void                   *object;
    void          const    *hwAttrs;
} AESCBC_Config;

The application must declare an array of AESCBC_Config elements, named AESCBC_config[]. Each element of AESCBC_config[] must be populated with pointers to a device specific AESCBC driver implementation's driver object and hardware attributes. The hardware attributes define properties such as the AESCBC peripheral's base address. Each element in AESCBC_config[] corresponds to an AESCBC instance and none of the elements should have NULL pointers. There is no correlation between the index and the peripheral designation (such as AESCBC0 or AESCBC1). For example, it is possible to use AESCBC_config[0] for AESCBC1. Multiple drivers and driver instances may all access the same underlying hardware. This is transparent to the application. Mutual exclusion is performed automatically by the drivers as necessary.

Because the AESCBC configuration is very device dependent, you will need to check the doxygen for the device specific AESCBC implementation. There you will find a description of the AESCBC hardware attributes. Please also refer to the Board.c file of any of your examples to see the AESCBC configuration.

AESCBC Parameters

The AESCBC_Params structure is passed to the AESCBC_open() call. If NULL is passed for the parameters, AESCBC_open() uses default parameters. A AESCBC_Params structure is initialized with default values by passing it to AESCBC_Params_init(). Some of the AESCBC parameters are described below. To see brief descriptions of all the parameters, see AESCBC_Params.

Examples

### Single call CBC encryption with plaintext CryptoKey in blocking return mode #

#include <ti/drivers/AESCBC.h>
#include <ti/drivers/types/cryptoKey/CryptoKey_Plaintext.h>
...
AESCBC_Handle handle;
CryptoKey cryptoKey;
int_fast16_t encryptionResult;
// For example purposes only. Generate IVs in a non-static way in practice.
// Test vector 0 from NIST CAPV set CBCMMT128
uint8_t iv[16] =                {0x2f, 0xe2, 0xb3, 0x33, 0xce, 0xda, 0x8f, 0x98,
                                 0xf4, 0xa9, 0x9b, 0x40, 0xd2, 0xcd, 0x34, 0xa8};
uint8_t plaintext[16] =         {0x45, 0xcf, 0x12, 0x96, 0x4f, 0xc8, 0x24, 0xab,
                                 0x76, 0x61, 0x6a, 0xe2, 0xf4, 0xbf, 0x08, 0x22};
uint8_t ciphertext[sizeof(plaintext)];
uint8_t keyingMaterial[16] =    {0x1f, 0x8e, 0x49, 0x73, 0x95, 0x3f, 0x3f, 0xb0,
                                 0xbd, 0x6b, 0x16, 0x66, 0x2e, 0x9a, 0x3c, 0x17};
// The ciphertext should be the following after the encryption operation:
//  0x0f, 0x61, 0xc4, 0xd4, 0x4c, 0x51, 0x47, 0xc0
//  0x3c, 0x19, 0x5a, 0xd7, 0xe2, 0xcc, 0x12, 0xb2
handle = AESCBC_open(0, NULL);
if (handle == NULL) {
    // handle error
}
CryptoKeyPlaintext_initKey(&cryptoKey, keyingMaterial, sizeof(keyingMaterial));
AESCBC_Operation operation;
AESCBC_Operation_init(&operation);
operation.key               = &cryptoKey;
operation.input             = plaintext;
operation.output            = ciphertext;
operation.inputLength       = sizeof(plaintext);
operation.iv                = iv;
encryptionResult = AESCBC_oneStepEncrypt(handle, &operation);
if (encryptionResult != AESCBC_STATUS_SUCCESS) {
    // handle error
}
AESCBC_close(handle);

Single call CBC decryption with plaintext CryptoKey in callback return mode

#include <ti/drivers/AESCBC.h>
#include <ti/drivers/cryptoutils/cryptokey/CryptoKeyPlaintext.h>
...
// Test vector 0 from NIST CAPV set CBCMMT256
uint8_t iv[16] =                {0xdd, 0xbb, 0xb0, 0x17, 0x3f, 0x1e, 0x2d, 0xeb,
                                 0x23, 0x94, 0xa6, 0x2a, 0xa2, 0xa0, 0x24, 0x0e};
uint8_t ciphertext[16] =        {0xd5, 0x1d, 0x19, 0xde, 0xd5, 0xca, 0x4a, 0xe1,
                                 0x4b, 0x2b, 0x20, 0xb0, 0x27, 0xff, 0xb0, 0x20};
uint8_t keyingMaterial[] =      {0x43, 0xe9, 0x53, 0xb2, 0xae, 0xa0, 0x8a, 0x3a,
                                 0xd5, 0x2d, 0x18, 0x2f, 0x58, 0xc7, 0x2b, 0x9c,
                                 0x60, 0xfb, 0xe4, 0xa9, 0xca, 0x46, 0xa3, 0xcb,
                                 0x89, 0xe3, 0x86, 0x38, 0x45, 0xe2, 0x2c, 0x9e};
uint8_t plaintext[sizeof(ciphertext)];
// The plaintext should be the following after the decryption operation:
//  0x07, 0x27, 0x0d, 0x0e, 0x63, 0xaa, 0x36, 0xda
//  0xed, 0x8c, 0x6a, 0xde, 0x13, 0xac, 0x1a, 0xf1
void cbcCallback(AESCBC_Handle handle,
                 int_fast16_t returnValue,
                 AESCBC_Operation *operation,
                 AESCBC_OperationType operationType) {
    if (returnValue != AESCBC_STATUS_SUCCESS) {
        // handle error
    }
}
AESCBC_Operation operation;
void cbcStartFunction(void) {
    AESCBC_Handle handle;
    AESCBC_Params params;
    CryptoKey cryptoKey;
    int_fast16_t decryptionResult;
    AESCBC_Params_init(&params);
    params.returnBehavior = AESCBC_RETURN_BEHAVIOR_CALLBACK;
    params.callbackFxn = cbcCallback;
    handle = AESCBC_open(0, &params);
    if (handle == NULL) {
        // handle error
    }
    CryptoKeyPlaintext_initKey(&cryptoKey, keyingMaterial, sizeof(keyingMaterial));
    AESCBC_Operation_init(&operation);
    operation.key               = &cryptoKey;
    operation.input             = plaintext;
    operation.output            = ciphertext;
    operation.inputLength       = sizeof(plaintext);
    operation.iv                = iv;
    decryptionResult = AESCBC_oneStepDecrypt(handle, &operation);
    if (decryptionResult != AESCBC_STATUS_SUCCESS) {
        // handle error
    }
    // do other things while CBC operation completes in the background
}

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <ti/drivers/cryptoutils/cryptokey/CryptoKey.h>

Go to the source code of this file.

Data Structures
struct	AESCBC_Operation_
	Struct containing the parameters required for encrypting/decrypting a message. More...

struct	AESCBC_Config_
	AESCBC Global configuration. More...

struct	AESCBC_Params_
	CBC Parameters. More...

Macros
#define	AESCBC_CMD_RESERVED (32)

#define	AESCBC_STATUS_RESERVED (-32)

#define	AESCBC_STATUS_SUCCESS (0)
	Successful status code. More...

#define	AESCBC_STATUS_ERROR (-1)
	Generic error status code. More...

#define	AESCBC_STATUS_UNDEFINEDCMD (-2)
	An error status code returned by AESCBC_control() for undefined command codes. More...

#define	AESCBC_STATUS_RESOURCE_UNAVAILABLE (-3)
	An error status code returned if the hardware or software resource is currently unavailable. More...

Typedefs
typedef struct AESCBC_Config_ *	AESCBC_Handle
	A handle that is returned from an AESCBC_open() call. More...

typedef enum AESCBC_ReturnBehavior_	AESCBC_ReturnBehavior
	The way in which CBC function calls return after performing an encryption or decryption operation. More...

typedef enum AESCBC_Mode_	AESCBC_Mode
	Enum for the direction of the CBC operation. More...

typedef struct AESCBC_Operation_	AESCBC_Operation
	Struct containing the parameters required for encrypting/decrypting a message. More...

typedef enum AESCBC_OperationType_	AESCBC_OperationType
	Enum for the operation types supported by the driver. More...

typedef struct AESCBC_Config_	AESCBC_Config
	AESCBC Global configuration. More...

typedef void(*	AESCBC_CallbackFxn) (AESCBC_Handle handle, int_fast16_t returnValue, AESCBC_Operation *operation, AESCBC_OperationType operationType)
	The definition of a callback function used by the AESCBC driver when used in AESCBC_RETURN_BEHAVIOR_CALLBACK. More...

typedef struct AESCBC_Params_	AESCBC_Params
	CBC Parameters. More...

Enumerations
enum	AESCBC_ReturnBehavior_ { AESCBC_RETURN_BEHAVIOR_CALLBACK = 1, AESCBC_RETURN_BEHAVIOR_BLOCKING = 2, AESCBC_RETURN_BEHAVIOR_POLLING = 4 }
	The way in which CBC function calls return after performing an encryption or decryption operation. More...

enum	AESCBC_Mode_ { AESCBC_MODE_ENCRYPT = 1, AESCBC_MODE_DECRYPT = 2 }
	Enum for the direction of the CBC operation. More...

enum	AESCBC_OperationType_ { AESCBC_OPERATION_TYPE_ENCRYPT = 1, AESCBC_OPERATION_TYPE_DECRYPT = 2 }
	Enum for the operation types supported by the driver. More...

Functions
void	AESCBC_init (void)
	This function initializes the CBC module. More...

void	AESCBC_Params_init (AESCBC_Params *params)
	Function to initialize the AESCBC_Params struct to its defaults. More...

AESCBC_Handle	AESCBC_open (uint_least8_t index, AESCBC_Params *params)
	This function opens a given CBC peripheral. More...

void	AESCBC_close (AESCBC_Handle handle)
	Function to close a CBC peripheral specified by the CBC handle. More...

int_fast16_t	AESCBC_control (AESCBC_Handle handle, uint32_t cmd, void *args)
	Function performs implementation specific features on a given AESCBC_Handle. More...

void	AESCBC_Operation_init (AESCBC_Operation *operationStruct)
	Function to initialize an AESCBC_Operation struct to its defaults. More...

int_fast16_t	AESCBC_oneStepEncrypt (AESCBC_Handle handle, AESCBC_Operation *operationStruct)
	Function to perform an AESCBC encryption operation in one call. More...

int_fast16_t	AESCBC_oneStepDecrypt (AESCBC_Handle handle, AESCBC_Operation *operationStruct)
	Function to perform an AESCBC decryption operation in one call. More...

Variables
const AESCBC_Params	AESCBC_defaultParams
	Default AESCBC_Params structure. More...

Typedef Documentation

§ AESCBC_Handle

typedef struct AESCBC_Config_* AESCBC_Handle

A handle that is returned from an AESCBC_open() call.

§ AESCBC_ReturnBehavior

typedef enum AESCBC_ReturnBehavior_ AESCBC_ReturnBehavior

The way in which CBC function calls return after performing an encryption or decryption operation.

Not all CBC operations exhibit the specified return behavor. Functions that do not require significant computation and cannot offload that computation to a background thread behave like regular functions. Which functions exhibit the specfied return behavior is not implementation dependent. Specifically, a software-backed implementation run on the same CPU as the application will emulate the return behavior while not actually offloading the computation to the background thread.

AESCBC functions exhibiting the specified return behavior have restrictions on the context from which they may be called.

	Task	Hwi	Swi
AESCBC_RETURN_BEHAVIOR_CALLBACK	X	X	X
AESCBC_RETURN_BEHAVIOR_BLOCKING	X
AESCBC_RETURN_BEHAVIOR_POLLING	X	X	X

§ AESCBC_Mode

typedef enum AESCBC_Mode_ AESCBC_Mode

Enum for the direction of the CBC operation.

§ AESCBC_Operation

typedef struct AESCBC_Operation_ AESCBC_Operation

Struct containing the parameters required for encrypting/decrypting a message.

§ AESCBC_OperationType

typedef enum AESCBC_OperationType_ AESCBC_OperationType

Enum for the operation types supported by the driver.

§ AESCBC_Config

typedef struct AESCBC_Config_ AESCBC_Config

AESCBC Global configuration.

The AESCBC_Config structure contains a set of pointers used to characterize the AESCBC driver implementation.

This structure needs to be defined before calling AESCBC_init() and it must not be changed thereafter.

See also: AESCBC_init()

§ AESCBC_CallbackFxn

typedef void(* AESCBC_CallbackFxn) (AESCBC_Handle handle, int_fast16_t returnValue, AESCBC_Operation *operation, AESCBC_OperationType operationType)

The definition of a callback function used by the AESCBC driver when used in AESCBC_RETURN_BEHAVIOR_CALLBACK.

Parameters

handle	Handle of the client that started the CBC operation.
returnValue	The result of the CBC operation. May contain an error code. Informs the application of why the callback function was called.
operation	A pointer to an operation struct.
operationType	This parameter determines which operation the callback refers to.

§ AESCBC_Params

typedef struct AESCBC_Params_ AESCBC_Params

CBC Parameters.

CBC Parameters are used to with the AESCBC_open() call. Default values for these parameters are set using AESCBC_Params_init().

See also: AESCBC_Params_init()

Enumeration Type Documentation

§ AESCBC_ReturnBehavior_

enum AESCBC_ReturnBehavior_

The way in which CBC function calls return after performing an encryption or decryption operation.

Not all CBC operations exhibit the specified return behavor. Functions that do not require significant computation and cannot offload that computation to a background thread behave like regular functions. Which functions exhibit the specfied return behavior is not implementation dependent. Specifically, a software-backed implementation run on the same CPU as the application will emulate the return behavior while not actually offloading the computation to the background thread.

AESCBC functions exhibiting the specified return behavior have restrictions on the context from which they may be called.

	Task	Hwi	Swi
AESCBC_RETURN_BEHAVIOR_CALLBACK	X	X	X
AESCBC_RETURN_BEHAVIOR_BLOCKING	X
AESCBC_RETURN_BEHAVIOR_POLLING	X	X	X

Enumerator
AESCBC_RETURN_BEHAVIOR_CALLBACK	The function call will return immediately while the CBC operation goes on in the background. The registered callback function is called after the operation completes. The context the callback function is called (task, HWI, SWI) is implementation-dependent.
AESCBC_RETURN_BEHAVIOR_BLOCKING	The function call will block while the CBC operation goes on in the background. CBC operation results are available after the function returns.
AESCBC_RETURN_BEHAVIOR_POLLING	The function call will continuously poll a flag while CBC operation goes on in the background. CBC operation results are available after the function returns.

§ AESCBC_Mode_

enum AESCBC_Mode_

Enum for the direction of the CBC operation.

Enumerator
AESCBC_MODE_ENCRYPT
AESCBC_MODE_DECRYPT

§ AESCBC_OperationType_

enum AESCBC_OperationType_

Enum for the operation types supported by the driver.

Enumerator
AESCBC_OPERATION_TYPE_ENCRYPT
AESCBC_OPERATION_TYPE_DECRYPT

Function Documentation

§ AESCBC_init()

void AESCBC_init ( void )

This function initializes the CBC module.

Precondition: The AESCBC_config structure must exist and be persistent before this function can be called. This function must also be called before any other CBC driver APIs. This function call does not modify any peripheral registers.

§ AESCBC_Params_init()

void AESCBC_Params_init ( AESCBC_Params * params )

Function to initialize the AESCBC_Params struct to its defaults.

Parameters

params An pointer to AESCBC_Params structure for initialization

Defaults values are: returnBehavior = AESCBC_RETURN_BEHAVIOR_BLOCKING callbackFxn = NULL timeout = SemaphoreP_WAIT_FOREVER custom = NULL

§ AESCBC_open()

AESCBC_Handle AESCBC_open	(	uint_least8_t	index,
		AESCBC_Params *	params
	)

This function opens a given CBC peripheral.

Precondition: CBC controller has been initialized using AESCBC_init()

Parameters

index	Logical peripheral number for the CBC indexed into the AESCBC_config table
params	Pointer to an parameter block, if NULL it will use default values.

Returns: An AESCBC_Handle on success or a NULL on an error or if it has been opened already.

See also: AESCBC_init(); AESCBC_close()

§ AESCBC_close()

void AESCBC_close ( AESCBC_Handle handle )

Function to close a CBC peripheral specified by the CBC handle.

Precondition: AESCBC_open() has to be called first.

Parameters

handle A CBC handle returned from AESCBC_open()

See also: AESCBC_open()

§ AESCBC_control()

int_fast16_t AESCBC_control	(	AESCBC_Handle	handle,
		uint32_t	cmd,
		void *	args
	)

Function performs implementation specific features on a given AESCBC_Handle.

Commands for AESCBC_control can originate from AESCBC.h or from implementation specific AESCBC*.h (AESCBCCC26XX.h, AESCBCMSP432.h, etc.. ) files. While commands from AESCBC.h are API portable across driver implementations, not all implementations may support all these commands. Conversely, commands from driver implementation specific AESCBC*.h files add unique driver capabilities but are not API portable across all AESCBC driver implementations.

Commands supported by AESCBC.h follow an AESCBC_CMD_<cmd> naming convention.
Commands supported by AESCBC*.h follow an AESCBC*_CMD_<cmd> naming convention.
Each control command defines arg differently. The types of arg are documented with each command.

See AESCBC_CMD "AESCBC_control command codes" for command codes.

See AESCBC_STATUS "AESCBC_control return status codes" for status codes.

Precondition: AESCBC_open() has to be called first.

Parameters

handle	An AESCBC handle returned from AESCBC_open()
cmd	AESCBC.h or AESCBC*.h commands.
args	An optional R/W (read/write) command argument accompanied with cmd

Returns: Implementation specific return codes. Negative values indicate unsuccessful operations.

See also: AESCBC_open()

§ AESCBC_Operation_init()

void AESCBC_Operation_init ( AESCBC_Operation * operationStruct )

Function to initialize an AESCBC_Operation struct to its defaults.

Parameters

operationStruct A pointer to an AESCBC_Operation structure for initialization

Defaults values are all zeros.

§ AESCBC_oneStepEncrypt()

int_fast16_t AESCBC_oneStepEncrypt	(	AESCBC_Handle	handle,
		AESCBC_Operation *	operationStruct
	)

Function to perform an AESCBC encryption operation in one call.

Note: None of the buffers provided as arguments may be altered by the application during an ongoing operation. Doing so can yield corrupted ciphertext.

Precondition: AESCBC_open() and AESCBC_Operation_init() must be called first.

Parameters

[in]	handle	A CBC handle returned from AESCBC_open()
[in]	operationStruct	A pointer to a struct containing the parameters required to perform the operation.

Returns: A status code

See also: AESCBC_oneStepDecrypt()

§ AESCBC_oneStepDecrypt()

int_fast16_t AESCBC_oneStepDecrypt	(	AESCBC_Handle	handle,
		AESCBC_Operation *	operationStruct
	)

Function to perform an AESCBC decryption operation in one call.

Note: None of the buffers provided as arguments may be altered by the application during an ongoing operation. Doing so can yield corrupted plaintext.

Precondition: AESCBC_open() and AESCBC_Operation_init() must be called first.

Parameters

[in]	handle	A CBC handle returned from AESCBC_open()
[in]	operationStruct	A pointer to a struct containing the parameters required to perform the operation.

Returns: A status code

See also: AESCBC_oneStepEncrypt()

Variable Documentation

§ AESCBC_defaultParams

const AESCBC_Params AESCBC_defaultParams

Default AESCBC_Params structure.

See also: AESCBC_Params_init()

Detailed Description

Overview

Operation

Padding

Initialization Vectors

Drawbacks

Usage

Before starting a CBC operation

Starting a CBC operation

After the CBC operation completes

AESCBC Driver Configuration

AESCBC Parameters

Examples

Single call CBC decryption with plaintext CryptoKey in callback return mode

Data Structures

Macros

Typedefs

Enumerations

Functions

Variables

Typedef Documentation

§ AESCBC_Handle

§ AESCBC_ReturnBehavior

§ AESCBC_Mode

§ AESCBC_Operation

§ AESCBC_OperationType

§ AESCBC_Config

§ AESCBC_CallbackFxn

§ AESCBC_Params

Enumeration Type Documentation

§ AESCBC_ReturnBehavior_

§ AESCBC_Mode_

§ AESCBC_OperationType_

Function Documentation

§ AESCBC_init()

§ AESCBC_Params_init()

§ AESCBC_open()

§ AESCBC_close()

§ AESCBC_control()

§ AESCBC_Operation_init()

§ AESCBC_oneStepEncrypt()

§ AESCBC_oneStepDecrypt()

Variable Documentation

§ AESCBC_defaultParams