aes.h File Reference

AES block cipher. More...

#include "config.h"
#include <stddef.h>
#include <stdint.h>

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Data Structures
struct	mbedtls_aes_context
	AES context structure. More...

Macros
#define	MBEDTLS_AES_ENCRYPT   1
#define	MBEDTLS_AES_DECRYPT   0
#define	MBEDTLS_ERR_AES_INVALID_KEY_LENGTH   -0x0020
	Invalid key length. More...
#define	MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH   -0x0022
	Invalid data input length. More...

Functions
void	mbedtls_aes_init (mbedtls_aes_context *ctx)
	Initialize AES context. More...
void	mbedtls_aes_free (mbedtls_aes_context *ctx)
	Clear AES context. More...
int	mbedtls_aes_setkey_enc (mbedtls_aes_context *ctx, const unsigned char *key, unsigned int keybits)
	AES key schedule (encryption) More...
int	mbedtls_aes_setkey_dec (mbedtls_aes_context *ctx, const unsigned char *key, unsigned int keybits)
	AES key schedule (decryption) More...
int	mbedtls_aes_crypt_ecb (mbedtls_aes_context *ctx, int mode, const unsigned char input[16], unsigned char output[16])
	AES-ECB block encryption/decryption. More...
int	mbedtls_aes_crypt_cbc (mbedtls_aes_context *ctx, int mode, size_t length, unsigned char iv[16], const unsigned char *input, unsigned char *output)
	AES-CBC buffer encryption/decryption Length should be a multiple of the block size (16 bytes) More...
int	mbedtls_aes_crypt_cfb128 (mbedtls_aes_context *ctx, int mode, size_t length, size_t *iv_off, unsigned char iv[16], const unsigned char *input, unsigned char *output)
	AES-CFB128 buffer encryption/decryption. More...
int	mbedtls_aes_crypt_cfb8 (mbedtls_aes_context *ctx, int mode, size_t length, unsigned char iv[16], const unsigned char *input, unsigned char *output)
	AES-CFB8 buffer encryption/decryption. More...
int	mbedtls_aes_crypt_ctr (mbedtls_aes_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)
	AES-CTR buffer encryption/decryption. More...
void	mbedtls_aes_encrypt (mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16])
	Internal AES block encryption function (Only exposed to allow overriding it, see MBEDTLS_AES_ENCRYPT_ALT) More...
void	mbedtls_aes_decrypt (mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16])
	Internal AES block decryption function (Only exposed to allow overriding it, see MBEDTLS_AES_DECRYPT_ALT) More...
int	mbedtls_aes_self_test (int verbose)
	Checkup routine. More...

Detailed Description

AES block cipher.

Copyright (C) 2006-2014, ARM Limited, All Rights Reserved

This file is part of mbed TLS (https://tls.mbed.org)

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Definition in file aes.h.

Macro Definition Documentation

#define MBEDTLS_AES_DECRYPT   0

Definition at line 38 of file aes.h.

#define MBEDTLS_AES_ENCRYPT   1

Definition at line 37 of file aes.h.

#define MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH   -0x0022

Invalid data input length.

Definition at line 41 of file aes.h.

#define MBEDTLS_ERR_AES_INVALID_KEY_LENGTH   -0x0020

Invalid key length.

Definition at line 40 of file aes.h.

Function Documentation

int mbedtls_aes_crypt_cbc	(	mbedtls_aes_context *	ctx,
		int	mode,
		size_t	length,
		unsigned char	iv[16],
		const unsigned char *	input,
		unsigned char *	output
	)

AES-CBC buffer encryption/decryption Length should be a multiple of the block size (16 bytes)

Note

Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.

Parameters

ctx	AES context
mode	MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
length	length of the input data
iv	initialization vector (updated after use)
input	buffer holding the input data
output	buffer holding the output data

Returns

0 if successful, or MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH

int mbedtls_aes_crypt_cfb128	(	mbedtls_aes_context *	ctx,
		int	mode,
		size_t	length,
		size_t *	iv_off,
		unsigned char	iv[16],
		const unsigned char *	input,
		unsigned char *	output
	)

AES-CFB128 buffer encryption/decryption.

Note: Due to the nature of CFB you should use the same key schedule for both encryption and decryption. So a context initialized with mbedtls_aes_setkey_enc() for both MBEDTLS_AES_ENCRYPT and MBEDTLS_AES_DECRYPT.

Note

Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.

Parameters

ctx	AES context
mode	MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
length	length of the input data
iv_off	offset in IV (updated after use)
iv	initialization vector (updated after use)
input	buffer holding the input data
output	buffer holding the output data

Returns

0 if successful

int mbedtls_aes_crypt_cfb8	(	mbedtls_aes_context *	ctx,
		int	mode,
		size_t	length,
		unsigned char	iv[16],
		const unsigned char *	input,
		unsigned char *	output
	)

AES-CFB8 buffer encryption/decryption.

Note: Due to the nature of CFB you should use the same key schedule for both encryption and decryption. So a context initialized with mbedtls_aes_setkey_enc() for both MBEDTLS_AES_ENCRYPT and MBEDTLS_AES_DECRYPT.

Note

Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.

Parameters

ctx	AES context
mode	MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
length	length of the input data
iv	initialization vector (updated after use)
input	buffer holding the input data
output	buffer holding the output data

Returns

0 if successful

int mbedtls_aes_crypt_ctr	(	mbedtls_aes_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
	)

AES-CTR buffer encryption/decryption.

Warning: You have to keep the maximum use of your counter in mind!

Note: Due to the nature of CTR you should use the same key schedule for both encryption and decryption. So a context initialized with mbedtls_aes_setkey_enc() for both MBEDTLS_AES_ENCRYPT and MBEDTLS_AES_DECRYPT.

Parameters

ctx	AES context
length	The length of the data
nc_off	The offset in the current stream_block (for resuming within current cipher stream). The offset pointer to should be 0 at the start of a stream.
nonce_counter	The 128-bit nonce and counter.
stream_block	The saved stream-block for resuming. Is overwritten by the function.
input	The input data stream
output	The output data stream

Returns

0 if successful

int mbedtls_aes_crypt_ecb	(	mbedtls_aes_context *	ctx,
		int	mode,
		const unsigned char	input[16],
		unsigned char	output[16]
	)

AES-ECB block encryption/decryption.

Parameters

ctx	AES context
mode	MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
input	16-byte input block
output	16-byte output block

Returns

0 if successful

void mbedtls_aes_decrypt	(	mbedtls_aes_context *	ctx,
		const unsigned char	input[16],
		unsigned char	output[16]
	)

Internal AES block decryption function (Only exposed to allow overriding it, see MBEDTLS_AES_DECRYPT_ALT)

Parameters

ctx	AES context
input	Ciphertext block
output	Output (plaintext) block

void mbedtls_aes_encrypt	(	mbedtls_aes_context *	ctx,
		const unsigned char	input[16],
		unsigned char	output[16]
	)

Internal AES block encryption function (Only exposed to allow overriding it, see MBEDTLS_AES_ENCRYPT_ALT)

Parameters

ctx	AES context
input	Plaintext block
output	Output (ciphertext) block

void mbedtls_aes_free

(

mbedtls_aes_context *

ctx

)

Clear AES context.

Parameters

ctx	AES context to be cleared

void mbedtls_aes_init

(

mbedtls_aes_context *

ctx

)

Initialize AES context.

Parameters

ctx	AES context to be initialized

int mbedtls_aes_self_test

(

int

verbose

)

Checkup routine.

Returns

0 if successful, or 1 if the test failed

int mbedtls_aes_setkey_dec	(	mbedtls_aes_context *	ctx,
		const unsigned char *	key,
		unsigned int	keybits
	)

AES key schedule (decryption)

Parameters

ctx	AES context to be initialized
key	decryption key
keybits	must be 128, 192 or 256

Returns

0 if successful, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH

int mbedtls_aes_setkey_enc	(	mbedtls_aes_context *	ctx,
		const unsigned char *	key,
		unsigned int	keybits
	)

AES key schedule (encryption)

Parameters

ctx	AES context to be initialized
key	encryption key
keybits	must be 128, 192 or 256

Returns

0 if successful, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH