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138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/* Copied from libtomcrypt/src/prngs/sprng.c and modified to
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* use Dropbear's genrandom(). */
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/* 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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* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
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*/
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#include "options.h"
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#include "includes.h"
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#include "dbrandom.h"
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#include "ltc_prng.h"
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/**
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@file sprng.c
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Secure PRNG, Tom St Denis
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*/
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/* A secure PRNG using the RNG functions. Basically this is a
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* wrapper that allows you to use a secure RNG as a PRNG
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* in the various other functions.
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*/
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#ifdef DROPBEAR_LTC_PRNG
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/**
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Start the PRNG
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@param prng [out] The PRNG state to initialize
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@return CRYPT_OK if successful
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*/
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int dropbear_prng_start(prng_state* UNUSED(prng))
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{
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return CRYPT_OK;
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}
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/**
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Add entropy to the PRNG state
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@param in The data to add
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@param inlen Length of the data to add
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@param prng PRNG state to update
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@return CRYPT_OK if successful
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*/
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int dropbear_prng_add_entropy(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
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{
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return CRYPT_OK;
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}
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/**
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Make the PRNG ready to read from
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@param prng The PRNG to make active
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@return CRYPT_OK if successful
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*/
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int dropbear_prng_ready(prng_state* UNUSED(prng))
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{
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return CRYPT_OK;
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}
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/**
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Read from the PRNG
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@param out Destination
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@param outlen Length of output
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@param prng The active PRNG to read from
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@return Number of octets read
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*/
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unsigned long dropbear_prng_read(unsigned char* out, unsigned long outlen, prng_state* UNUSED(prng))
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{
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LTC_ARGCHK(out != NULL);
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genrandom(out, outlen);
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return outlen;
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}
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/**
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Terminate the PRNG
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@param prng The PRNG to terminate
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@return CRYPT_OK if successful
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*/
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int dropbear_prng_done(prng_state* UNUSED(prng))
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{
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return CRYPT_OK;
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}
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/**
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Export the PRNG state
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@param out [out] Destination
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@param outlen [in/out] Max size and resulting size of the state
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@param prng The PRNG to export
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@return CRYPT_OK if successful
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*/
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int dropbear_prng_export(unsigned char* UNUSED(out), unsigned long* outlen, prng_state* UNUSED(prng))
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{
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LTC_ARGCHK(outlen != NULL);
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*outlen = 0;
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return CRYPT_OK;
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}
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/**
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Import a PRNG state
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@param in The PRNG state
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@param inlen Size of the state
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@param prng The PRNG to import
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@return CRYPT_OK if successful
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*/
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int dropbear_prng_import(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
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{
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return CRYPT_OK;
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}
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/**
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PRNG self-test
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@return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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*/
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int dropbear_prng_test(void)
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{
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return CRYPT_OK;
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}
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const struct ltc_prng_descriptor dropbear_prng_desc =
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{
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"dropbear_prng", 0,
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&dropbear_prng_start,
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&dropbear_prng_add_entropy,
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&dropbear_prng_ready,
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&dropbear_prng_read,
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&dropbear_prng_done,
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&dropbear_prng_export,
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&dropbear_prng_import,
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&dropbear_prng_test
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};
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#endif /* DROPBEAR_LTC_PRNG */
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