aes.h File Reference

AES implementation that uses only 8-bit byte operations on the cipher state. More...

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	aes_context

Macros
#define	AES_ENC_PREKEYED   /* AES encryption with a precomputed key schedule */
#define	AES_DEC_PREKEYED   /* AES decryption with a precomputed key schedule */
#define	N_ROW   4
#define	N_COL   4
#define	N_BLOCK   (N_ROW * N_COL)
#define	N_MAX_ROUNDS   14

Typedefs
typedef uint8_t	return_type
typedef uint8_t	length_type

Functions
return_type	aes_set_key (const uint8_t key[], length_type keylen, aes_context ctx[1])
	Sets the key for AES encryption/decryption. More...
return_type	aes_encrypt (const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1])
	Encrypts a single block of 16 bytes. More...
return_type	aes_encrypt_all (const uint8_t *in, uint8_t *out, uint32_t len, const aes_context ctx[1])
	Encrypts a buffer of n x 16 bytes. More...
return_type	aes_cbc_encrypt (const uint8_t *in, uint8_t *out, int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1])
return_type	aes_decrypt (const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1])
	Decrypts a single block of 16 bytes. More...
return_type	aes_decrypt_all (const uint8_t *in, uint8_t *out, uint32_t len, const aes_context ctx[1])
	Decrypts a buffer of n x 16 bytes. More...
return_type	aes_cbc_decrypt (const uint8_t *in, uint8_t *out, int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1])

Detailed Description

AES implementation that uses only 8-bit byte operations on the cipher state.

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Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.

LICENSE TERMS

The redistribution and use of this software (with or without changes) is allowed without the payment of fees or royalties provided that:

1. source code distributions include the above copyright notice, this list of conditions and the following disclaimer;
2. binary distributions include the above copyright notice, this list of conditions and the following disclaimer in their documentation;
3. the name of the copyright holder is not used to endorse products built using this software without specific written permission.

DISCLAIMER

This software is provided 'as is' with no explicit or implied warranties in respect of its properties, including, but not limited to, correctness and/or fitness for purpose.

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Issue 09/09/2006

This is an AES implementation that uses only 8-bit byte operations on the cipher state.

Function Documentation

return_type aes_decrypt	(	const uint8_t	in[N_BLOCK],
		uint8_t	out[N_BLOCK],
		const aes_context	ctx[1]
	)

Decrypts a single block of 16 bytes.

Parameters

in	The block to decrypt.
out	The buffer that will hold the decrypted block.
ctx	The current AES context.

Return values

uint32_t

0 if everything is OK, -1 otherwise.

return_type aes_decrypt_all	(	const uint8_t *	in,
		uint8_t *	out,
		uint32_t	len,
		const aes_context	ctx[1]
	)

Decrypts a buffer of n x 16 bytes.

Parameters

in	The block to decrypt.
out	The buffer that will hold the decrypted block.
len	The length of the buffer.
ctx	The current AES context.

Return values

uint32_t

0 if everything is OK, -1 otherwise.

return_type aes_encrypt	(	const uint8_t	in[N_BLOCK],
		uint8_t	out[N_BLOCK],
		const aes_context	ctx[1]
	)

Encrypts a single block of 16 bytes.

Parameters

in	The block to encrypt.
out	The buffer that will hold the encrypted block.
ctx	The current AES context.

Return values

uint32_t

0 if everything is OK, -1 otherwise.

return_type aes_encrypt_all	(	const uint8_t *	in,
		uint8_t *	out,
		uint32_t	len,
		const aes_context	ctx[1]
	)

Encrypts a buffer of n x 16 bytes.

Parameters

in	The buffer to encrypt.
out	The buffer that will hold the encrypted data.
len	The length of the buffer.
ctx	The current AES context.

Return values

uint32_t

0 if everything is OK, -1 otherwise.

return_type aes_set_key	(	const uint8_t	key[],
		length_type	keylen,
		aes_context	ctx[1]
	)

Sets the key for AES encryption/decryption.

Parameters

key	The AES key to use.
keylen	The length of the key.
ctx	The current AES context.

Return values

uint32_t

0 if everything went OK, -1 otherwise.