The Tor Browser: netwerk/srtp/src/crypto/include/prng.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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  */

    45 #ifndef PRNG_H

    46 #define PRNG_H

    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                             */

    52 #define MAX_PRNG_OUT_LEN 0xffffffffU

    54 /*

    55  * x917_prng is an ANSI X9.17-like AES-based PRNG

    56  */

    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;

    65 err_status_t

    66 x917_prng_init(rand_source_func_t random_source);

    68 err_status_t

    69 x917_prng_get_octet_string(uint8_t *dest, uint32_t len);

    72 /*

    73  * ctr_prng is an AES-CTR based PRNG

    74  */

    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;

    82 err_status_t

    83 ctr_prng_init(rand_source_func_t random_source);

    85 err_status_t

    86 ctr_prng_get_octet_string(void *dest, uint32_t len);

    89 #endif

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