| /* |
| * prng.h |
| * |
| * pseudorandom source |
| * |
| * David A. McGrew |
| * Cisco Systems, Inc. |
| */ |
| |
| /* |
| * |
| * Copyright (c) 2001-2006, Cisco Systems, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * Neither the name of the Cisco Systems, Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #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 |