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comparison: netwerk/srtp/src/crypto/include/prng.h
netwerk/srtp/src/crypto/include/prng.h
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:11b9c2113e00 |
|---|---|
| 1 /* | |
| 2 * prng.h | |
| 3 * | |
| 4 * pseudorandom source | |
| 5 * | |
| 6 * David A. McGrew | |
| 7 * Cisco Systems, Inc. | |
| 8 */ | |
| 9 /* | |
| 10 * | |
| 11 * Copyright (c) 2001-2006, Cisco Systems, Inc. | |
| 12 * All rights reserved. | |
| 13 * | |
| 14 * Redistribution and use in source and binary forms, with or without | |
| 15 * modification, are permitted provided that the following conditions | |
| 16 * are met: | |
| 17 * | |
| 18 * Redistributions of source code must retain the above copyright | |
| 19 * notice, this list of conditions and the following disclaimer. | |
| 20 * | |
| 21 * Redistributions in binary form must reproduce the above | |
| 22 * copyright notice, this list of conditions and the following | |
| 23 * disclaimer in the documentation and/or other materials provided | |
| 24 * with the distribution. | |
| 25 * | |
| 26 * Neither the name of the Cisco Systems, Inc. nor the names of its | |
| 27 * contributors may be used to endorse or promote products derived | |
| 28 * from this software without specific prior written permission. | |
| 29 * | |
| 30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
| 33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
| 34 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
| 35 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 36 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 37 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 41 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 42 * | |
| 43 */ | |
| 44 | |
| 45 #ifndef PRNG_H | |
| 46 #define PRNG_H | |
| 47 | |
| 48 #include "rand_source.h" /* for rand_source_func_t definition */ | |
| 49 #include "aes.h" /* for aes */ | |
| 50 #include "aes_icm.h" /* for aes ctr */ | |
| 51 | |
| 52 #define MAX_PRNG_OUT_LEN 0xffffffffU | |
| 53 | |
| 54 /* | |
| 55 * x917_prng is an ANSI X9.17-like AES-based PRNG | |
| 56 */ | |
| 57 | |
| 58 typedef struct { | |
| 59 v128_t state; /* state data */ | |
| 60 aes_expanded_key_t key; /* secret key */ | |
| 61 uint32_t octet_count; /* number of octets output since last init */ | |
| 62 rand_source_func_t rand; /* random source for re-initialization */ | |
| 63 } x917_prng_t; | |
| 64 | |
| 65 err_status_t | |
| 66 x917_prng_init(rand_source_func_t random_source); | |
| 67 | |
| 68 err_status_t | |
| 69 x917_prng_get_octet_string(uint8_t *dest, uint32_t len); | |
| 70 | |
| 71 | |
| 72 /* | |
| 73 * ctr_prng is an AES-CTR based PRNG | |
| 74 */ | |
| 75 | |
| 76 typedef struct { | |
| 77 uint32_t octet_count; /* number of octets output since last init */ | |
| 78 aes_icm_ctx_t state; /* state data */ | |
| 79 rand_source_func_t rand; /* random source for re-initialization */ | |
| 80 } ctr_prng_t; | |
| 81 | |
| 82 err_status_t | |
| 83 ctr_prng_init(rand_source_func_t random_source); | |
| 84 | |
| 85 err_status_t | |
| 86 ctr_prng_get_octet_string(void *dest, uint32_t len); | |
| 87 | |
| 88 | |
| 89 #endif |
