aes.h File Reference

The Advanced Encryption Standard (AES) specifies a FIPS-approved cryptographic algorithm that can be used to protect electronic data. More...

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

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Data Structures
struct	mbedtls_aes_context
	The AES context-type definition. More...
Defines
#define	MBEDTLS_AES_ENCRYPT   1
#define	MBEDTLS_AES_DECRYPT   0
#define	MBEDTLS_ERR_AES_INVALID_KEY_LENGTH   -0x0020
#define	MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH   -0x0022
#define	MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE   -0x0023
#define	MBEDTLS_ERR_AES_HW_ACCEL_FAILED   -0x0025
#define	MBEDTLS_DEPRECATED
Functions
void	mbedtls_aes_init (mbedtls_aes_context *ctx)
	This function initializes the specified AES context.
void	mbedtls_aes_free (mbedtls_aes_context *ctx)
	This function releases and clears the specified AES context.
int	mbedtls_aes_setkey_enc (mbedtls_aes_context *ctx, const unsigned char *key, unsigned int keybits)
	This function sets the encryption key.
int	mbedtls_aes_setkey_dec (mbedtls_aes_context *ctx, const unsigned char *key, unsigned int keybits)
	This function sets the decryption key.
int	mbedtls_aes_crypt_ecb (mbedtls_aes_context *ctx, int mode, const unsigned char input[16], unsigned char output[16])
	This function performs an AES single-block encryption or decryption operation.
int	mbedtls_internal_aes_encrypt (mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16])
	Internal AES block encryption function. This is only exposed to allow overriding it using MBEDTLS_AES_ENCRYPT_ALT.
int	mbedtls_internal_aes_decrypt (mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16])
	Internal AES block decryption function. This is only exposed to allow overriding it using see MBEDTLS_AES_DECRYPT_ALT.
MBEDTLS_DEPRECATED void	mbedtls_aes_encrypt (mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16])
	Deprecated internal AES block encryption function without return value.
MBEDTLS_DEPRECATED void	mbedtls_aes_decrypt (mbedtls_aes_context *ctx, const unsigned char input[16], unsigned char output[16])
	Deprecated internal AES block decryption function without return value.
int	mbedtls_aes_self_test (int verbose)
	Checkup routine.

---

Detailed Description

The Advanced Encryption Standard (AES) specifies a FIPS-approved cryptographic algorithm that can be used to protect electronic data.

The AES algorithm is a symmetric block cipher that can encrypt and decrypt information. For more information, see FIPS Publication 197: Advanced Encryption Standard and ISO/IEC 18033-2:2006: Information technology -- Security techniques -- Encryption algorithms -- Part 2: Asymmetric ciphers.

Definition in file aes.h.

---

Define Documentation

#define MBEDTLS_AES_DECRYPT   0

AES decryption.

Definition at line 73 of file aes.h.

#define MBEDTLS_AES_ENCRYPT   1

AES encryption.

Definition at line 72 of file aes.h.

#define MBEDTLS_DEPRECATED

Definition at line 387 of file aes.h.

#define MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE   -0x0023

Feature not available. For example, an unsupported AES key size.

Definition at line 80 of file aes.h.

#define MBEDTLS_ERR_AES_HW_ACCEL_FAILED   -0x0025

AES hardware accelerator failed.

Definition at line 81 of file aes.h.

#define MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH   -0x0022

Invalid data input length.

Definition at line 77 of file aes.h.

#define MBEDTLS_ERR_AES_INVALID_KEY_LENGTH   -0x0020

Invalid key length.

Definition at line 76 of file aes.h.

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Function Documentation

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

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

It performs the operation defined in the mode parameter (encrypt or decrypt), on the input data buffer defined in the input parameter.

mbedtls_aes_init(), and either mbedtls_aes_setkey_enc() or mbedtls_aes_setkey_dec() must be called before the first call to this API with the same context.

Parameters:

	ctx	The AES context to use for encryption or decryption.
	mode	The AES operation: MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT.
	input	The 16-Byte buffer holding the input data.
	output	The 16-Byte buffer holding the output data.

Returns:

0 on success.

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

Deprecated internal AES block decryption function without return value.

Deprecated:

Superseded by mbedtls_aes_decrypt_ext() in 2.5.0.

Parameters:

	ctx	The AES context to use for decryption.
	input	Ciphertext block.
	output	Output (plaintext) block.

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

Deprecated internal AES block encryption function without return value.

Deprecated:

Superseded by mbedtls_aes_encrypt_ext() in 2.5.0.

Parameters:

	ctx	The AES context to use for encryption.
	input	Plaintext block.
	output	Output (ciphertext) block.

void mbedtls_aes_free

(

mbedtls_aes_context *

ctx

)

This function releases and clears the specified AES context.

Parameters:

ctx

The AES context to clear.

void mbedtls_aes_init

(

mbedtls_aes_context *

ctx

)

This function initializes the specified AES context.

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

Parameters:

ctx

The AES context to initialize.

int mbedtls_aes_self_test

(

int

verbose

)

Checkup routine.

Returns:

0 on success, or 1 on failure.

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

This function sets the decryption key.

Parameters:

	ctx	The AES context to which the key should be bound.
	key	The decryption key.
	keybits	The size of data passed. Valid options are: 128 bits 192 bits 256 bits

Returns:

0 on success, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.

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

This function sets the encryption key.

Parameters:

	ctx	The AES context to which the key should be bound.
	key	The encryption key.
	keybits	The size of data passed in bits. Valid options are: 128 bits 192 bits 256 bits

Returns:

0 on success or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.

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

Internal AES block decryption function. This is only exposed to allow overriding it using see MBEDTLS_AES_DECRYPT_ALT.

Parameters:

	ctx	The AES context to use for decryption.
	input	The ciphertext block.
	output	The output (plaintext) block.

Returns:

0 on success.

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

Internal AES block encryption function. This is only exposed to allow overriding it using MBEDTLS_AES_ENCRYPT_ALT.

Parameters:

	ctx	The AES context to use for encryption.
	input	The plaintext block.
	output	The output (ciphertext) block.

Returns:

0 on success.