55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
|
|
* prng.h
|
|
*
|
|
* pseudorandom source
|
|
*
|
|
* David A. McGrew
|
|
* Cisco Systems, Inc.
|
|
*/
|
|
|
|
#ifndef PRNG_H
|
|
#define PRNG_H
|
|
|
|
#include "rand_source.h" /* for rand_source_func_t definition */
|
|
#include "aes.h" /* for aes */
|
|
#include "aes_icm.h" /* for aes ctr */
|
|
|
|
#define MAX_PRNG_OUT_LEN 0xffffffffU
|
|
|
|
/*
|
|
* x917_prng is an ANSI X9.17-like AES-based PRNG
|
|
*/
|
|
|
|
typedef struct {
|
|
v128_t state; /* state data */
|
|
aes_expanded_key_t key; /* secret key */
|
|
uint32_t octet_count; /* number of octets output since last init */
|
|
rand_source_func_t rand; /* random source for re-initialization */
|
|
} x917_prng_t;
|
|
|
|
err_status_t
|
|
x917_prng_init(rand_source_func_t random_source);
|
|
|
|
err_status_t
|
|
x917_prng_get_octet_string(uint8_t *dest, uint32_t len);
|
|
|
|
|
|
/*
|
|
* ctr_prng is an AES-CTR based PRNG
|
|
*/
|
|
|
|
typedef struct {
|
|
uint32_t octet_count; /* number of octets output since last init */
|
|
aes_icm_ctx_t state; /* state data */
|
|
rand_source_func_t rand; /* random source for re-initialization */
|
|
} ctr_prng_t;
|
|
|
|
err_status_t
|
|
ctr_prng_init(rand_source_func_t random_source);
|
|
|
|
err_status_t
|
|
ctr_prng_get_octet_string(void *dest, uint32_t len);
|
|
|
|
|
|
#endif
|