aes-internal-enc.c File Reference

AES (Rijndael) cipher - encrypt. More...

#include "includes.h"
#include "common.h"
#include "crypto.h"
#include "aes_i.h"

Macros
#define	ROUND(i, d, s)

Functions
void *	aes_encrypt_init (const u8 *key, size_t len)
	Initialize AES for encryption. More...
void	aes_encrypt (void *ctx, const u8 *plain, u8 *crypt)
	Encrypt one AES block. More...
void	aes_encrypt_deinit (void *ctx)
	Deinitialize AES encryption. More...

Detailed Description

AES (Rijndael) cipher - encrypt.

Modifications to public domain implementation:

• cleanup
• use C pre-processor to make it easier to change S table access
• added option (AES_SMALL_TABLES) for reducing code size by about 8 kB at cost of reduced throughput (quite small difference on Pentium 4, 10-25% when using -O1 or -O2 optimization)

Macro Definition Documentation

#define ROUND	(		i,
			d,
			s
	)

Value:

d##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \
d##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \
d##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \
d##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3]

Function Documentation

void aes_encrypt	(	void *	ctx,
		const u8 *	plain,
		u8 *	crypt
	)

Encrypt one AES block.

Parameters

ctx	Context pointer from aes_encrypt_init()
plain	Plaintext data to be encrypted (16 bytes)
crypt	Buffer for the encrypted data (16 bytes)

void aes_encrypt_deinit

(

void *

ctx

)

Deinitialize AES encryption.

Parameters

ctx	Context pointer from aes_encrypt_init()

void* aes_encrypt_init	(	const u8 *	key,
		size_t	len
	)

Initialize AES for encryption.

Parameters

key	Encryption key
len	Key length in bytes (usually 16, i.e., 128 bits)

Returns

Pointer to context data or NULL on failure