ARIA

Data Structures
struct	mbedtls_aria_context
	The ARIA context-type definition. More...

Macros
#define	MBEDTLS_ARIA_ENCRYPT   1
	ARIA encryption. More...
#define	MBEDTLS_ARIA_DECRYPT   0
	ARIA decryption. More...
#define	MBEDTLS_ARIA_BLOCKSIZE   16
	ARIA block size in bytes. More...
#define	MBEDTLS_ARIA_MAX_ROUNDS   16
	Maxiumum number of rounds in ARIA. More...
#define	MBEDTLS_ARIA_MAX_KEYSIZE   32
	Maximum size of an ARIA key in bytes. More...
#define	MBEDTLS_ERR_ARIA_BAD_INPUT_DATA   -0x005C
	Bad input data. More...
#define	MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH   -0x005E
	Invalid data input length. More...
#define	MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE   -0x005A
	Feature not available. More...
#define	MBEDTLS_ERR_ARIA_HW_ACCEL_FAILED   -0x0058
	ARIA hardware accelerator failed. More...

Typedefs
typedef struct mbedtls_aria_context	mbedtls_aria_context
	The ARIA context-type definition. More...

Functions
void	mbedtls_aria_init (mbedtls_aria_context *ctx)
	This function initializes the specified ARIA context. More...
void	mbedtls_aria_free (mbedtls_aria_context *ctx)
	This function releases and clears the specified ARIA context. More...
int	mbedtls_aria_setkey_enc (mbedtls_aria_context *ctx, const unsigned char *key, unsigned int keybits)
	This function sets the encryption key. More...
int	mbedtls_aria_setkey_dec (mbedtls_aria_context *ctx, const unsigned char *key, unsigned int keybits)
	This function sets the decryption key. More...
int	mbedtls_aria_crypt_ecb (mbedtls_aria_context *ctx, const unsigned char input[16], unsigned char output[16])
	This function performs an ARIA single-block encryption or decryption operation. More...
int	mbedtls_aria_crypt_ctr (mbedtls_aria_context *ctx, size_t length, size_t *nc_off, unsigned char nonce_counter[16], unsigned char stream_block[16], const unsigned char *input, unsigned char *output)
	This function performs an ARIA-CTR encryption or decryption operation. More...

Detailed Description

Macro Definition Documentation

MBEDTLS_ARIA_ENCRYPT

#define MBEDTLS_ARIA_ENCRYPT   1

ARIA encryption.

Definition at line 50 of file aria.h.

MBEDTLS_ARIA_DECRYPT

#define MBEDTLS_ARIA_DECRYPT   0

ARIA decryption.

Definition at line 51 of file aria.h.

MBEDTLS_ARIA_BLOCKSIZE

#define MBEDTLS_ARIA_BLOCKSIZE   16

ARIA block size in bytes.

Definition at line 53 of file aria.h.

MBEDTLS_ARIA_MAX_ROUNDS

#define MBEDTLS_ARIA_MAX_ROUNDS   16

Maxiumum number of rounds in ARIA.

Definition at line 54 of file aria.h.

MBEDTLS_ARIA_MAX_KEYSIZE

#define MBEDTLS_ARIA_MAX_KEYSIZE   32

Maximum size of an ARIA key in bytes.

Definition at line 55 of file aria.h.

MBEDTLS_ERR_ARIA_BAD_INPUT_DATA

#define MBEDTLS_ERR_ARIA_BAD_INPUT_DATA   -0x005C

Bad input data.

Definition at line 60 of file aria.h.

MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH

#define MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH   -0x005E

Invalid data input length.

Definition at line 62 of file aria.h.

MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE

#define MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE   -0x005A

Feature not available.

For example, an unsupported ARIA key size.

Definition at line 66 of file aria.h.

MBEDTLS_ERR_ARIA_HW_ACCEL_FAILED

#define MBEDTLS_ERR_ARIA_HW_ACCEL_FAILED   -0x0058

ARIA hardware accelerator failed.

Definition at line 69 of file aria.h.

Typedef Documentation

mbedtls_aria_context

typedef struct mbedtls_aria_context mbedtls_aria_context

The ARIA context-type definition.

Function Documentation

mbedtls_aria_init()

void mbedtls_aria_init

(

mbedtls_aria_context *

ctx

)

This function initializes the specified ARIA context.

            It must be the first API called before using
            the context.

Parameters

ctx	The ARIA context to initialize. This must not be NULL.

mbedtls_aria_free()

void mbedtls_aria_free

(

mbedtls_aria_context *

ctx

)

This function releases and clears the specified ARIA context.

Parameters

ctx	The ARIA context to clear. This may be NULL, in which case this function returns immediately. If it is not NULL, it must point to an initialized ARIA context.

mbedtls_aria_setkey_enc()

int mbedtls_aria_setkey_enc	(	mbedtls_aria_context *	ctx,
		const unsigned char *	key,
		unsigned int	keybits
	)

This function sets the encryption key.

Parameters

ctx	The ARIA context to which the key should be bound. This must be initialized.
key	The encryption key. This must be a readable buffer of size keybits Bits.
keybits	The size of key in Bits. Valid options are: 128 bits 192 bits 256 bits

Returns

0 on success.

A negative error code on failure.

mbedtls_aria_setkey_dec()

int mbedtls_aria_setkey_dec	(	mbedtls_aria_context *	ctx,
		const unsigned char *	key,
		unsigned int	keybits
	)

This function sets the decryption key.

Parameters

ctx	The ARIA context to which the key should be bound. This must be initialized.
key	The decryption key. This must be a readable buffer of size keybits Bits.
keybits	The size of data passed. Valid options are: 128 bits 192 bits 256 bits

Returns

0 on success.

A negative error code on failure.

mbedtls_aria_crypt_ecb()

int mbedtls_aria_crypt_ecb	(	mbedtls_aria_context *	ctx,
		const unsigned char	input[16],
		unsigned char	output[16]
	)

This function performs an ARIA single-block encryption or decryption operation.

It performs encryption or decryption (depending on whether the key was set for encryption on decryption) on the input data buffer defined in the input parameter.

mbedtls_aria_init(), and either mbedtls_aria_setkey_enc() or mbedtls_aria_setkey_dec() must be called before the first call to this API with the same context.

Parameters

ctx	The ARIA context to use for encryption or decryption. This must be initialized and bound to a key.
input	The 16-Byte buffer holding the input data.
output	The 16-Byte buffer holding the output data.

Returns

0 on success.

A negative error code on failure.

mbedtls_aria_crypt_ctr()

int mbedtls_aria_crypt_ctr	(	mbedtls_aria_context *	ctx,
		size_t	length,
		size_t *	nc_off,
		unsigned char	nonce_counter[16],
		unsigned char	stream_block[16],
		const unsigned char *	input,
		unsigned char *	output
	)

This function performs an ARIA-CTR encryption or decryption operation.

This function performs the operation defined in the mode parameter (encrypt/decrypt), on the input data buffer defined in the input parameter.

Due to the nature of CTR, you must use the same key schedule for both encryption and decryption operations. Therefore, you must use the context initialized with mbedtls_aria_setkey_enc() for both MBEDTLS_ARIA_ENCRYPT and MBEDTLS_ARIA_DECRYPT.

Warning

You must never reuse a nonce value with the same key. Doing so would void the encryption for the two messages encrypted with the same nonce and key.

There are two common strategies for managing nonces with CTR:

1. You can handle everything as a single message processed over successive calls to this function. In that case, you want to set nonce_counter and nc_off to 0 for the first call, and then preserve the values of nonce_counter, nc_off and stream_block across calls to this function as they will be updated by this function.

With this strategy, you must not encrypt more than 2**128 blocks of data with the same key.

1. You can encrypt separate messages by dividing the nonce_counter buffer in two areas: the first one used for a per-message nonce, handled by yourself, and the second one updated by this function internally.

For example, you might reserve the first 12 bytes for the per-message nonce, and the last 4 bytes for internal use. In that case, before calling this function on a new message you need to set the first 12 bytes of nonce_counter to your chosen nonce value, the last 4 to 0, and nc_off to 0 (which will cause stream_block to be ignored). That way, you can encrypt at most 2**96 messages of up to 2**32 blocks each with the same key.

The per-message nonce (or information sufficient to reconstruct it) needs to be communicated with the ciphertext and must be unique. The recommended way to ensure uniqueness is to use a message counter. An alternative is to generate random nonces, but this limits the number of messages that can be securely encrypted: for example, with 96-bit random nonces, you should not encrypt more than 2**32 messages with the same key.

Note that for both stategies, sizes are measured in blocks and that an ARIA block is 16 bytes.

Warning

Upon return, stream_block contains sensitive data. Its content must not be written to insecure storage and should be securely discarded as soon as it's no longer needed.

Parameters

ctx	The ARIA context to use for encryption or decryption. This must be initialized and bound to a key.
length	The length of the input data input in Bytes.
nc_off	The offset in Bytes in the current stream_block, for resuming within the current cipher stream. The offset pointer should be 0 at the start of a stream. This must not be larger than 15 Bytes.
nonce_counter	The 128-bit nonce and counter. This must point to a read/write buffer of length 16 bytes.
stream_block	The saved stream block for resuming. This must point to a read/write buffer of length 16 bytes. This is overwritten by the function.
input	The buffer holding the input data. This must be a readable buffer of length length Bytes.
output	The buffer holding the output data. This must be a writable buffer of length length Bytes.

Returns

0 on success.

A negative error code on failure.