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70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#ifdef LTC_RNG_MAKE_PRNG
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/**
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@file rng_make_prng.c
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portable way to get secure random bits to feed a PRNG (Tom St Denis)
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*/
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/**
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Create a PRNG from a RNG
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@param bits Number of bits of entropy desired (64 ... 1024)
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@param wprng Index of which PRNG to setup
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@param prng [out] PRNG state to initialize
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@param callback A pointer to a void function for when the RNG is slow, this can be NULL
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@return CRYPT_OK if successful
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*/
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int rng_make_prng(int bits, int wprng, prng_state *prng,
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void (*callback)(void))
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{
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unsigned char buf[256];
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int err;
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LTC_ARGCHK(prng != NULL);
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/* check parameter */
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if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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return err;
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}
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if (bits < 64 || bits > 1024) {
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return CRYPT_INVALID_PRNGSIZE;
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}
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if ((err = prng_descriptor[wprng].start(prng)) != CRYPT_OK) {
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return err;
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}
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bits = ((bits/8)+((bits&7)!=0?1:0)) * 2;
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if (rng_get_bytes(buf, (unsigned long)bits, callback) != (unsigned long)bits) {
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return CRYPT_ERROR_READPRNG;
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}
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if ((err = prng_descriptor[wprng].add_entropy(buf, (unsigned long)bits, prng)) != CRYPT_OK) {
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return err;
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}
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if ((err = prng_descriptor[wprng].ready(prng)) != CRYPT_OK) {
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return err;
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}
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#ifdef LTC_CLEAN_STACK
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zeromem(buf, sizeof(buf));
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#endif
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return CRYPT_OK;
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}
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#endif /* #ifdef LTC_RNG_MAKE_PRNG */
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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