1386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* 2386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * prng.h 3386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 4386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * pseudorandom source 5386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 6386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * David A. McGrew 7386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Cisco Systems, Inc. 8386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari */ 9386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 10386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#ifndef PRNG_H 11386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#define PRNG_H 12386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 13386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#include "rand_source.h" /* for rand_source_func_t definition */ 14386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#include "aes.h" /* for aes */ 15386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#include "aes_icm.h" /* for aes ctr */ 16386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 17386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#define MAX_PRNG_OUT_LEN 0xffffffffU 18386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 19386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* 20386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * x917_prng is an ANSI X9.17-like AES-based PRNG 21386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari */ 22386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 23386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagaritypedef struct { 24386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari v128_t state; /* state data */ 25386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari aes_expanded_key_t key; /* secret key */ 26386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari uint32_t octet_count; /* number of octets output since last init */ 27386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari rand_source_func_t rand; /* random source for re-initialization */ 28386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} x917_prng_t; 29386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 30386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 31386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarix917_prng_init(rand_source_func_t random_source); 32386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 33386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 34386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarix917_prng_get_octet_string(uint8_t *dest, uint32_t len); 35386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 36386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 37386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* 38386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * ctr_prng is an AES-CTR based PRNG 39386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari */ 40386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 41386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagaritypedef struct { 42386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari uint32_t octet_count; /* number of octets output since last init */ 43386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari aes_icm_ctx_t state; /* state data */ 44386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari rand_source_func_t rand; /* random source for re-initialization */ 45386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} ctr_prng_t; 46386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 47386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 48386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarictr_prng_init(rand_source_func_t random_source); 49386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 50386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 51386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarictr_prng_get_octet_string(void *dest, uint32_t len); 52386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 53386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 54386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#endif 55