rand.c File Reference

Pseudo-random number generator. More...

Data Structures
struct	Hash_DRBG_CTX
struct	xmpp_rand_t

Macros
#define	outlen   SHA1_DIGEST_SIZE
#define	seedlen   (440 / 8)
#define	reseed_interval   0x7fffffff
#define	GENERATE_MAX   (outlen * 10)
#define	ENTROPY_MAX   128
#define	NONCE_MAX   8
#define	RESEED_NEEDED   (-1)
#define	round_up(x, y)   (((x) + (y)-1) / (y) * (y))
#define	div_round_up(x, y)   (((x) + (y)-1) / (y))
#define	ENTROPY_ACCUMULATE(ptr, last, type, arg)

Functions
static void	arr_add (uint8_t *arr1, size_t arr1_len, uint8_t *arr2, size_t arr2_len)
static void	store_be32 (uint32_t val, uint8_t be[4])
static void	Hash_df (uint8_t *input_string, size_t input_string_len, uint8_t *output_string, size_t no_of_bytes_to_return)
static void	Hash_DRBG_Instantiate (Hash_DRBG_CTX *ctx, uint8_t *entropy_input, size_t entropy_input_len, uint8_t *nonce, size_t nonce_len)
static void	Hash_DRBG_Reseed (Hash_DRBG_CTX *ctx, uint8_t *entropy_input, size_t entropy_input_len)
static void	Hashgen (uint8_t *V, uint8_t *output, size_t requested_number_of_bytes)
static int	Hash_DRBG_Generate (Hash_DRBG_CTX *ctx, uint8_t *output, size_t requested_number_of_bytes)
static void	xmpp_rand_reseed (xmpp_rand_t *rand)
xmpp_rand_t *	xmpp_rand_new (xmpp_ctx_t *ctx)
	Create new xmpp_rand_t object.
void	xmpp_rand_free (xmpp_ctx_t *ctx, xmpp_rand_t *rand)
	Destroy an xmpp_rand_t object.
void	xmpp_rand_bytes (xmpp_rand_t *rand, unsigned char *output, size_t len)
	Generate random bytes.
int	xmpp_rand (xmpp_rand_t *rand)
	Generate random integer.
static void	rand_byte2hex (unsigned char byte, char *hex)
void	xmpp_rand_nonce (xmpp_rand_t *rand, char *output, size_t len)
	Generate a nonce that is printable randomized string.

Detailed Description

Pseudo-random number generator.

Implemented Hash_DRBG mechanism according to NIST SP 800-90A. Hash function is SHA1.

Macro Definition Documentation

outlen

#define outlen   SHA1_DIGEST_SIZE

seedlen

#define seedlen   (440 / 8)

reseed_interval

#define reseed_interval   0x7fffffff

GENERATE_MAX

#define GENERATE_MAX   (outlen * 10)

ENTROPY_MAX

#define ENTROPY_MAX   128

NONCE_MAX

#define NONCE_MAX   8

RESEED_NEEDED

#define RESEED_NEEDED   (-1)

round_up

#define round_up	(		x,
			y
	)		(((x) + (y)-1) / (y) * (y))

div_round_up

#define div_round_up	(		x,
			y
	)		(((x) + (y)-1) / (y))

ENTROPY_ACCUMULATE

#define ENTROPY_ACCUMULATE	(		ptr,
			last,
			type,
			arg
	)

Value:

    do {                                                  \
        type __arg = (type)(arg);                         \
        if ((char *)ptr + sizeof(__arg) < (char *)last) { \
            *(type *)ptr = __arg;                         \
            ptr = (void *)((char *)ptr + sizeof(__arg));  \
        }                                                 \
    } while (0)

Function Documentation

arr_add()

static void arr_add ( uint8_t *  arr1, size_t  arr1_len, uint8_t *  arr2, size_t  arr2_len  )

static

store_be32()

static void store_be32 ( uint32_t  val, uint8_t  be[4]  )

static

Hash_df()

static void Hash_df ( uint8_t *  input_string, size_t  input_string_len, uint8_t *  output_string, size_t  no_of_bytes_to_return  )

static

Hash_DRBG_Instantiate()

static void Hash_DRBG_Instantiate ( Hash_DRBG_CTX *  ctx, uint8_t *  entropy_input, size_t  entropy_input_len, uint8_t *  nonce, size_t  nonce_len  )

static

Hash_DRBG_Reseed()

static void Hash_DRBG_Reseed ( Hash_DRBG_CTX *  ctx, uint8_t *  entropy_input, size_t  entropy_input_len  )

static

Hashgen()

static void Hashgen ( uint8_t *  V, uint8_t *  output, size_t  requested_number_of_bytes  )

static

Hash_DRBG_Generate()

static int Hash_DRBG_Generate ( Hash_DRBG_CTX *  ctx, uint8_t *  output, size_t  requested_number_of_bytes  )

static

xmpp_rand_reseed()

static void xmpp_rand_reseed ( xmpp_rand_t *  rand )

static

rand_byte2hex()

static void rand_byte2hex ( unsigned char  byte, char *  hex  )

static