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core: add small wrappers around cryptographic PRNG with an interface …
…like fastrand
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/* | ||
* cryptographic secure pseudo random generation | ||
* | ||
* Copyright (C) 2019 Henning Westerholt | ||
* | ||
* Permission to use, copy, modify, and distribute this software for any | ||
* purpose with or without fee is hereby granted, provided that the above | ||
* copyright notice and this permission notice appear in all copies. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
*/ | ||
/* wrapper around fortuna cryptographic pseudo random number generator | ||
* https://en.wikipedia.org/wiki/Fortuna_(PRNG) | ||
*/ | ||
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#include "cryptorand.h" | ||
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#include "fortuna/random.h" | ||
#include "../dprint.h" | ||
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/* seed the generator, will also use system randomness */ | ||
void cryptorand_seed(const unsigned int seed) { | ||
u_int8_t bytes[4]; | ||
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bytes[0] = (seed >> 24) & 0xFF; | ||
bytes[1] = (seed >> 16) & 0xFF; | ||
bytes[2] = (seed >> 8) & 0xFF; | ||
bytes[3] = seed & 0xFF; | ||
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LM_DBG("seeding cryptorand generator with %u\n", seed); | ||
sr_add_entropy(bytes, 4); | ||
} | ||
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/* generate a 32 bit random number */ | ||
unsigned int cryptorand(void) { | ||
u_int8_t bytes[4]; | ||
u_int32_t result = 0; | ||
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sr_get_pseudo_random_bytes(bytes, 4); | ||
result |= (u_int32_t)bytes[0] << 24; | ||
result |= (u_int32_t)bytes[1] << 16; | ||
result |= (u_int32_t)bytes[2] << 8; | ||
result |= (u_int32_t)bytes[3]; | ||
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return result; | ||
} | ||
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/* | ||
* cryptographic secure pseudo random generation | ||
* | ||
* Copyright (C) 2019 Henning Westerholt | ||
* | ||
* Permission to use, copy, modify, and distribute this software for any | ||
* purpose with or without fee is hereby granted, provided that the above | ||
* copyright notice and this permission notice appear in all copies. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
*/ | ||
/* wrapper around fortuna cryptographic pseudo random number generator | ||
* https://en.wikipedia.org/wiki/Fortuna_(PRNG) | ||
*/ | ||
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#ifndef _cryptorand_h | ||
#define _cryptorand_h | ||
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#include <sys/types.h> | ||
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/* seed the generator, will also use system randomness */ | ||
void cryptorand_seed(const unsigned int seed); | ||
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/* generate a 32 bit random number */ | ||
unsigned int cryptorand(void); | ||
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#endif |