ctaes.c File Reference

#include "ctaes.h"

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Macros
#define	BIT_RANGE(from, to)
#define	BIT_RANGE_LEFT(x, from, to, shift)
#define	BIT_RANGE_RIGHT(x, from, to, shift)
#define	ROT(x, b)

Functions
static void	LoadByte (AES_state *s, unsigned char byte, int r, int c)
	Convert a byte to sliced form, storing it corresponding to given row and column in s.
static void	LoadBytes (AES_state *s, const unsigned char *data16)
	Load 16 bytes of data into 8 sliced integers.
static void	SaveBytes (unsigned char *data16, const AES_state *s)
	Convert 8 sliced integers into 16 bytes of data.
static void	SubBytes (AES_state *s, int inv)
static void	ShiftRows (AES_state *s)
static void	InvShiftRows (AES_state *s)
static void	MixColumns (AES_state *s, int inv)
static void	AddRoundKey (AES_state *s, const AES_state *round)
static void	GetOneColumn (AES_state *s, const AES_state *a, int c)
	column_0(s) = column_c(a)
static void	KeySetupColumnMix (AES_state *s, AES_state *r, const AES_state *a, int c1, int c2)
	column_c1(r) |= (column_0(s) ^= column_c2(a))
static void	KeySetupTransform (AES_state *s, const AES_state *r)
	Rotate the rows in s one position upwards, and xor in r.
static void	MultX (AES_state *s)
static void	AES_setup (AES_state *rounds, const uint8_t *key, int nkeywords, int nrounds)
	Expand the cipher key into the key schedule.
static void	AES_encrypt (const AES_state *rounds, int nrounds, unsigned char *cipher16, const unsigned char *plain16)
static void	AES_decrypt (const AES_state *rounds, int nrounds, unsigned char *plain16, const unsigned char *cipher16)
void	AES128_init (AES128_ctx *ctx, const unsigned char *key16)
void	AES128_encrypt (const AES128_ctx *ctx, size_t blocks, unsigned char *cipher16, const unsigned char *plain16)
void	AES128_decrypt (const AES128_ctx *ctx, size_t blocks, unsigned char *plain16, const unsigned char *cipher16)
void	AES192_init (AES192_ctx *ctx, const unsigned char *key24)
void	AES192_encrypt (const AES192_ctx *ctx, size_t blocks, unsigned char *cipher16, const unsigned char *plain16)
void	AES192_decrypt (const AES192_ctx *ctx, size_t blocks, unsigned char *plain16, const unsigned char *cipher16)
void	AES256_init (AES256_ctx *ctx, const unsigned char *key32)
void	AES256_encrypt (const AES256_ctx *ctx, size_t blocks, unsigned char *cipher16, const unsigned char *plain16)
void	AES256_decrypt (const AES256_ctx *ctx, size_t blocks, unsigned char *plain16, const unsigned char *cipher16)

Macro Definition Documentation

BIT_RANGE

#define BIT_RANGE	(		from,
			to )

Value:

(((1 << ((to) - (from))) - 1) << (from))

Definition at line 258 of file ctaes.c.

BIT_RANGE_LEFT

#define BIT_RANGE_LEFT	(		x,
			from,
			to,
			shift )

Value:

(((x) & BIT_RANGE((from), (to))) << (shift))

Definition at line 260 of file ctaes.c.

BIT_RANGE_RIGHT

#define BIT_RANGE_RIGHT	(		x,
			from,
			to,
			shift )

Value:

(((x) & BIT_RANGE((from), (to))) >> (shift))

Definition at line 261 of file ctaes.c.

ROT

#define ROT	(		x,
			b )

Value:

(((x) >> ((b) * 4)) | ((x) << ((4-(b)) * 4)))

Definition at line 287 of file ctaes.c.

Function Documentation

AddRoundKey()

void AddRoundKey ( AES_state * s, const AES_state * round )

static

Definition at line 354 of file ctaes.c.

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AES128_decrypt()

void AES128_decrypt	(	const AES128_ctx *	ctx,
		size_t	blocks,
		unsigned char *	plain16,
		const unsigned char *	cipher16 )

Definition at line 509 of file ctaes.c.

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AES128_encrypt()

void AES128_encrypt	(	const AES128_ctx *	ctx,
		size_t	blocks,
		unsigned char *	cipher16,
		const unsigned char *	plain16 )

Definition at line 501 of file ctaes.c.

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AES128_init()

void AES128_init	(	AES128_ctx *	ctx,
		const unsigned char *	key16 )

Definition at line 497 of file ctaes.c.

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AES192_decrypt()

void AES192_decrypt	(	const AES192_ctx *	ctx,
		size_t	blocks,
		unsigned char *	plain16,
		const unsigned char *	cipher16 )

Definition at line 530 of file ctaes.c.

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AES192_encrypt()

void AES192_encrypt	(	const AES192_ctx *	ctx,
		size_t	blocks,
		unsigned char *	cipher16,
		const unsigned char *	plain16 )

Definition at line 521 of file ctaes.c.

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AES192_init()

void AES192_init	(	AES192_ctx *	ctx,
		const unsigned char *	key24 )

Definition at line 517 of file ctaes.c.

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AES256_decrypt()

void AES256_decrypt	(	const AES256_ctx *	ctx,
		size_t	blocks,
		unsigned char *	plain16,
		const unsigned char *	cipher16 )

Definition at line 550 of file ctaes.c.

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AES256_encrypt()

void AES256_encrypt	(	const AES256_ctx *	ctx,
		size_t	blocks,
		unsigned char *	cipher16,
		const unsigned char *	plain16 )

Definition at line 542 of file ctaes.c.

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AES256_init()

void AES256_init	(	AES256_ctx *	ctx,
		const unsigned char *	key32 )

Definition at line 538 of file ctaes.c.

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AES_decrypt()

void AES_decrypt ( const AES_state * rounds, int nrounds, unsigned char * plain16, const unsigned char * cipher16 )

static

Definition at line 470 of file ctaes.c.

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AES_encrypt()

void AES_encrypt ( const AES_state * rounds, int nrounds, unsigned char * cipher16, const unsigned char * plain16 )

static

Definition at line 449 of file ctaes.c.

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AES_setup()

void AES_setup ( AES_state * rounds, const uint8_t * key, int nkeywords, int nrounds )

static

Expand the cipher key into the key schedule.

state must be a pointer to an array of size nrounds + 1. key must be a pointer to 4 * nkeywords bytes.

AES128 uses nkeywords = 4, nrounds = 10 AES192 uses nkeywords = 6, nrounds = 12 AES256 uses nkeywords = 8, nrounds = 14

Definition at line 407 of file ctaes.c.

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GetOneColumn()

void GetOneColumn ( AES_state * s, const AES_state * a, int c )

static

column_0(s) = column_c(a)

Definition at line 362 of file ctaes.c.

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InvShiftRows()

void InvShiftRows ( AES_state * s )

static

Definition at line 275 of file ctaes.c.

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KeySetupColumnMix()

void KeySetupColumnMix ( AES_state * s, AES_state * r, const AES_state * a, int c1, int c2 )

static

column_c1(r) |= (column_0(s) ^= column_c2(a))

Definition at line 370 of file ctaes.c.

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KeySetupTransform()

void KeySetupTransform ( AES_state * s, const AES_state * r )

static

Rotate the rows in s one position upwards, and xor in r.

Definition at line 378 of file ctaes.c.

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LoadByte()

void LoadByte ( AES_state * s, unsigned char byte, int r, int c )

static

Convert a byte to sliced form, storing it corresponding to given row and column in s.

Definition at line 25 of file ctaes.c.

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LoadBytes()

void LoadBytes ( AES_state * s, const unsigned char * data16 )

static

Load 16 bytes of data into 8 sliced integers.

Definition at line 34 of file ctaes.c.

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MixColumns()

void MixColumns ( AES_state * s, int inv )

static

Definition at line 289 of file ctaes.c.

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MultX()

void MultX ( AES_state * s )

static

Definition at line 386 of file ctaes.c.

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SaveBytes()

void SaveBytes ( unsigned char * data16, const AES_state * s )

static

Convert 8 sliced integers into 16 bytes of data.

Definition at line 45 of file ctaes.c.

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ShiftRows()

void ShiftRows ( AES_state * s )

static

Definition at line 263 of file ctaes.c.

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SubBytes()

void SubBytes ( AES_state * s, int inv )

static

Definition at line 64 of file ctaes.c.

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