Alexandre Lision | 8af73cb | 2013-12-10 14:11:20 -0500 | [diff] [blame] | 1 | /* |
| 2 | * prng.h |
| 3 | * |
| 4 | * pseudorandom source |
| 5 | * |
| 6 | * David A. McGrew |
| 7 | * Cisco Systems, Inc. |
| 8 | */ |
| 9 | |
| 10 | #ifndef PRNG_H |
| 11 | #define PRNG_H |
| 12 | |
| 13 | #include "rand_source.h" /* for rand_source_func_t definition */ |
| 14 | #include "aes.h" /* for aes */ |
| 15 | #include "aes_icm.h" /* for aes ctr */ |
| 16 | |
| 17 | #define MAX_PRNG_OUT_LEN 0xffffffffU |
| 18 | |
| 19 | /* |
| 20 | * x917_prng is an ANSI X9.17-like AES-based PRNG |
| 21 | */ |
| 22 | |
| 23 | typedef struct { |
| 24 | v128_t state; /* state data */ |
| 25 | aes_expanded_key_t key; /* secret key */ |
| 26 | uint32_t octet_count; /* number of octets output since last init */ |
| 27 | rand_source_func_t rand; /* random source for re-initialization */ |
| 28 | } x917_prng_t; |
| 29 | |
| 30 | err_status_t |
| 31 | x917_prng_init(rand_source_func_t random_source); |
| 32 | |
| 33 | err_status_t |
| 34 | x917_prng_get_octet_string(uint8_t *dest, uint32_t len); |
| 35 | |
| 36 | |
| 37 | /* |
| 38 | * ctr_prng is an AES-CTR based PRNG |
| 39 | */ |
| 40 | |
| 41 | typedef struct { |
| 42 | uint32_t octet_count; /* number of octets output since last init */ |
| 43 | aes_icm_ctx_t state; /* state data */ |
| 44 | rand_source_func_t rand; /* random source for re-initialization */ |
| 45 | } ctr_prng_t; |
| 46 | |
| 47 | err_status_t |
| 48 | ctr_prng_init(rand_source_func_t random_source); |
| 49 | |
| 50 | err_status_t |
| 51 | ctr_prng_get_octet_string(void *dest, uint32_t len); |
| 52 | |
| 53 | |
| 54 | #endif |