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- /*
- * 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
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