chacha_private.h File Reference

Go to the source code of this file.

Data Structures
struct	chacha_ctx
Defines
#define	U8C(v)   (v##U)
#define	U32C(v)   (v##U)
#define	U8V(v)   ((u8)(v) & U8C(0xFF))
#define	U32V(v)   ((u32)(v) & U32C(0xFFFFFFFF))
#define	ROTL32(v, n)   (U32V((v) << (n)) | ((v) >> (32 - (n))))
#define	U8TO32_LITTLE(p)
#define	U32TO8_LITTLE(p, v)
#define	ROTATE(v, c)   (ROTL32(v,c))
#define	XOR(v, w)   ((v) ^ (w))
#define	PLUS(v, w)   (U32V((v) + (w)))
#define	PLUSONE(v)   (PLUS((v),1))
#define	QUARTERROUND(a, b, c, d)
Typedefs
typedef unsigned char	u8
typedef unsigned int	u32
Functions
static void	chacha_keysetup (chacha_ctx *x, const u8 *k, u32 kbits, u32 ivbits)
static void	chacha_ivsetup (chacha_ctx *x, const u8 *iv)
static void	chacha_encrypt_bytes (chacha_ctx *x, const u8 *m, u8 *c, u32 bytes)
Variables
static const char	sigma [16]
static const char	tau [16]

---

Define Documentation

#define U8C

(

v

)

(v##U)

Definition at line 20 of file chacha_private.h.

#define U32C

(

v

)

(v##U)

Definition at line 21 of file chacha_private.h.

#define U8V

(

v

)

((u8)(v) & U8C(0xFF))

Definition at line 23 of file chacha_private.h.

#define U32V

(

v

)

((u32)(v) & U32C(0xFFFFFFFF))

Definition at line 24 of file chacha_private.h.

#define ROTL32	(	v,
		n		)	(U32V((v) << (n)) | ((v) >> (32 - (n))))

Definition at line 26 of file chacha_private.h.

#define U8TO32_LITTLE

(

p

)

Value:

(((u32)((p)[0])      ) | \
   ((u32)((p)[1]) <<  8) | \
   ((u32)((p)[2]) << 16) | \
   ((u32)((p)[3]) << 24))

Definition at line 29 of file chacha_private.h.

Referenced by chacha_encrypt_bytes(), chacha_ivsetup(), and chacha_keysetup().

#define U32TO8_LITTLE	(	p,
		v		)

Value:

do { \
    (p)[0] = U8V((v)      ); \
    (p)[1] = U8V((v) >>  8); \
    (p)[2] = U8V((v) >> 16); \
    (p)[3] = U8V((v) >> 24); \
  } while (0)

Definition at line 35 of file chacha_private.h.

Referenced by chacha_encrypt_bytes().

#define ROTATE	(	v,
		c		)	(ROTL32(v,c))

Definition at line 43 of file chacha_private.h.

#define XOR	(	v,
		w		)	((v) ^ (w))

Definition at line 44 of file chacha_private.h.

Referenced by chacha_encrypt_bytes().

#define PLUS	(	v,
		w		)	(U32V((v) + (w)))

Definition at line 45 of file chacha_private.h.

Referenced by chacha_encrypt_bytes().

#define PLUSONE

(

v

)

(PLUS((v),1))

Definition at line 46 of file chacha_private.h.

Referenced by chacha_encrypt_bytes().

#define QUARTERROUND	(	a,
		b,
		c,
		d		)

Value:

a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \
  c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \
  a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
  c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);

Definition at line 48 of file chacha_private.h.

Referenced by chacha_encrypt_bytes().

---

Typedef Documentation

typedef unsigned char u8

Definition at line 12 of file chacha_private.h.

typedef unsigned int u32

Definition at line 13 of file chacha_private.h.

---

Function Documentation

static void chacha_keysetup	(	chacha_ctx *	x,
		const u8 *	k,
		u32	kbits,
		u32	ivbits
	)			[static]

Definition at line 60 of file chacha_private.h.

References chacha_ctx::input, sigma, tau, U8TO32_LITTLE, and UNUSED.

Referenced by chacha_reinit().

static void chacha_ivsetup	(	chacha_ctx *	x,
		const u8 *	iv
	)			[static]

Definition at line 87 of file chacha_private.h.

References chacha_ctx::input, and U8TO32_LITTLE.

Referenced by chacha_reinit().

static void chacha_encrypt_bytes	(	chacha_ctx *	x,
		const u8 *	m,
		u8 *	c,
		u32	bytes
	)			[static]

Definition at line 96 of file chacha_private.h.

References chacha_ctx::input, PLUS, PLUSONE, QUARTERROUND, U32TO8_LITTLE, U8TO32_LITTLE, and XOR.

Referenced by chacha_rekey().

---

Variable Documentation

const char sigma[16] [static]

Initial value:

 { 'e', 'x', 'p', 'a', 'n', 'd', ' ', '3',
                                '2', '-', 'b', 'y', 't', 'e', ' ', 'k' }

Definition at line 54 of file chacha_private.h.

Referenced by chacha_keysetup().

const char tau[16] [static]

Initial value:

 { 'e', 'x', 'p', 'a', 'n', 'd', ' ', '1',
                              '6', '-', 'b', 'y', 't', 'e', ' ', 'k' }

Definition at line 56 of file chacha_private.h.

Referenced by chacha_keysetup(), and runs().

---