| /* |
| * 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 */ |
| //FIXME: this is temporary until we pull in the code to use OpenSSL for RNG |
| #ifdef OPENSSL |
| #include "aes_icm_ossl.h" /* for aes ctr */ |
| #else |
| #include "aes_icm.h" /* for aes ctr */ |
| #endif |
| |
| #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 |