ctaes.c File Reference

#include "ctaes.h"

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Macros
#define	BIT_RANGE(from, to)   (((1 << ((to) - (from))) - 1) << (from))
#define	BIT_RANGE_LEFT(x, from, to, shift)    (((x)&BIT_RANGE((from), (to))) << (shift))
#define	BIT_RANGE_RIGHT(x, from, to, shift)    (((x)&BIT_RANGE((from), (to))) >> (shift))
#define	ROT(x, b)   (((x) >> ((b)*4)) | ((x) << ((4 - (b)) * 4)))

Functions
static void	LoadByte (AES_state *s, uint8_t byte, int r, int c)
	Convert a byte to sliced form, storing it corresponding to given row and column in s. More...
static void	LoadBytes (AES_state *s, const uint8_t *data16)
	Load 16 bytes of data into 8 sliced integers. More...
static void	SaveBytes (uint8_t *data16, const AES_state *s)
	Convert 8 sliced integers into 16 bytes of data. More...
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) More...
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)) More...
static void	KeySetupTransform (AES_state *s, const AES_state *r)
	Rotate the rows in s one position upwards, and xor in r. More...
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. More...
static void	AES_encrypt (const AES_state *rounds, int nrounds, uint8_t *cipher16, const uint8_t *plain16)
static void	AES_decrypt (const AES_state *rounds, int nrounds, uint8_t *plain16, const uint8_t *cipher16)
void	AES128_init (AES128_ctx *ctx, const uint8_t *key16)
void	AES128_encrypt (const AES128_ctx *ctx, size_t blocks, uint8_t *cipher16, const uint8_t *plain16)
void	AES128_decrypt (const AES128_ctx *ctx, size_t blocks, uint8_t *plain16, const uint8_t *cipher16)
void	AES192_init (AES192_ctx *ctx, const uint8_t *key24)
void	AES192_encrypt (const AES192_ctx *ctx, size_t blocks, uint8_t *cipher16, const uint8_t *plain16)
void	AES192_decrypt (const AES192_ctx *ctx, size_t blocks, uint8_t *plain16, const uint8_t *cipher16)
void	AES256_init (AES256_ctx *ctx, const uint8_t *key32)
void	AES256_encrypt (const AES256_ctx *ctx, size_t blocks, uint8_t *cipher16, const uint8_t *plain16)
void	AES256_decrypt (const AES256_ctx *ctx, size_t blocks, uint8_t *plain16, const uint8_t *cipher16)

Macro Definition Documentation

BIT_RANGE

#define BIT_RANGE	(		from,
			to
	)		(((1 << ((to) - (from))) - 1) << (from))

Definition at line 267 of file ctaes.c.

BIT_RANGE_LEFT

#define BIT_RANGE_LEFT	(		x,
			from,
			to,
			shift
	)		(((x)&BIT_RANGE((from), (to))) << (shift))

Definition at line 269 of file ctaes.c.

BIT_RANGE_RIGHT

#define BIT_RANGE_RIGHT	(		x,
			from,
			to,
			shift
	)		(((x)&BIT_RANGE((from), (to))) >> (shift))

Definition at line 271 of file ctaes.c.

ROT

#define ROT	(		x,
			b
	)		(((x) >> ((b)*4)) | ((x) << ((4 - (b)) * 4)))

Definition at line 298 of file ctaes.c.

Function Documentation

AddRoundKey()

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

static

Definition at line 367 of file ctaes.c.

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AES128_decrypt()

void AES128_decrypt	(	const AES128_ctx *	ctx,
		size_t	blocks,
		uint8_t *	plain16,
		const uint8_t *	cipher16
	)

Definition at line 531 of file ctaes.c.

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AES128_encrypt()

void AES128_encrypt	(	const AES128_ctx *	ctx,
		size_t	blocks,
		uint8_t *	cipher16,
		const uint8_t *	plain16
	)

Definition at line 522 of file ctaes.c.

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AES128_init()

void AES128_init	(	AES128_ctx *	ctx,
		const uint8_t *	key16
	)

Definition at line 518 of file ctaes.c.

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AES192_decrypt()

void AES192_decrypt	(	const AES192_ctx *	ctx,
		size_t	blocks,
		uint8_t *	plain16,
		const uint8_t *	cipher16
	)

Definition at line 553 of file ctaes.c.

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AES192_encrypt()

void AES192_encrypt	(	const AES192_ctx *	ctx,
		size_t	blocks,
		uint8_t *	cipher16,
		const uint8_t *	plain16
	)

Definition at line 544 of file ctaes.c.

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AES192_init()

void AES192_init	(	AES192_ctx *	ctx,
		const uint8_t *	key24
	)

Definition at line 540 of file ctaes.c.

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AES256_decrypt()

void AES256_decrypt	(	const AES256_ctx *	ctx,
		size_t	blocks,
		uint8_t *	plain16,
		const uint8_t *	cipher16
	)

Definition at line 575 of file ctaes.c.

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AES256_encrypt()

void AES256_encrypt	(	const AES256_ctx *	ctx,
		size_t	blocks,
		uint8_t *	cipher16,
		const uint8_t *	plain16
	)

Definition at line 566 of file ctaes.c.

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AES256_init()

void AES256_init	(	AES256_ctx *	ctx,
		const uint8_t *	key32
	)

Definition at line 562 of file ctaes.c.

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AES_decrypt()

static void AES_decrypt ( const AES_state *  rounds, int  nrounds, uint8_t *  plain16, const uint8_t *  cipher16  )

static

Definition at line 490 of file ctaes.c.

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AES_encrypt()

static void AES_encrypt ( const AES_state *  rounds, int  nrounds, uint8_t *  cipher16, const uint8_t *  plain16  )

static

Definition at line 468 of file ctaes.c.

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AES_setup()

static 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 423 of file ctaes.c.

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GetOneColumn()

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

static

column_0(s) = column_c(a)

Definition at line 375 of file ctaes.c.

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InvShiftRows()

static void InvShiftRows ( AES_state *  s )

static

Definition at line 286 of file ctaes.c.

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KeySetupColumnMix()

static 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 383 of file ctaes.c.

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KeySetupTransform()

static 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 393 of file ctaes.c.

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LoadByte()

static void LoadByte ( AES_state *  s, uint8_t  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 29 of file ctaes.c.

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LoadBytes()

static void LoadBytes ( AES_state *  s, const uint8_t *  data16  )

static

Load 16 bytes of data into 8 sliced integers.

Definition at line 38 of file ctaes.c.

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MixColumns()

static void MixColumns ( AES_state *  s, int  inv  )

static

Definition at line 300 of file ctaes.c.

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MultX()

static void MultX ( AES_state *  s )

static

Definition at line 402 of file ctaes.c.

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SaveBytes()

static void SaveBytes ( uint8_t *  data16, const AES_state *  s  )

static

Convert 8 sliced integers into 16 bytes of data.

Definition at line 49 of file ctaes.c.

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ShiftRows()

static void ShiftRows ( AES_state *  s )

static

Definition at line 274 of file ctaes.c.

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SubBytes()

static void SubBytes ( AES_state *  s, int  inv  )

static

Definition at line 68 of file ctaes.c.

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