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/* Copied from libtomcrypt/src/prngs/sprng.c and modified to
* use Dropbear's genrandom(). */
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
*/
#include "options.h"
#include "includes.h"
#include "random.h"
#include "ltc_prng.h"
/**
@file sprng.c
Secure PRNG, Tom St Denis
*/
/* A secure PRNG using the RNG functions. Basically this is a
* wrapper that allows you to use a secure RNG as a PRNG
* in the various other functions.
*/
#ifdef DROPBEAR_LTC_PRNG
/**
Start the PRNG
@param prng [out] The PRNG state to initialize
@return CRYPT_OK if successful
*/
int dropbear_prng_start(prng_state* UNUSED(prng))
{
return CRYPT_OK;
}
/**
Add entropy to the PRNG state
@param in The data to add
@param inlen Length of the data to add
@param prng PRNG state to update
@return CRYPT_OK if successful
*/
int dropbear_prng_add_entropy(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
{
return CRYPT_OK;
}
/**
Make the PRNG ready to read from
@param prng The PRNG to make active
@return CRYPT_OK if successful
*/
int dropbear_prng_ready(prng_state* UNUSED(prng))
{
return CRYPT_OK;
}
/**
Read from the PRNG
@param out Destination
@param outlen Length of output
@param prng The active PRNG to read from
@return Number of octets read
*/
unsigned long dropbear_prng_read(unsigned char* out, unsigned long outlen, prng_state* UNUSED(prng))
{
LTC_ARGCHK(out != NULL);
genrandom(out, outlen);
return outlen;
}
/**
Terminate the PRNG
@param prng The PRNG to terminate
@return CRYPT_OK if successful
*/
int dropbear_prng_done(prng_state* UNUSED(prng))
{
return CRYPT_OK;
}
/**
Export the PRNG state
@param out [out] Destination
@param outlen [in/out] Max size and resulting size of the state
@param prng The PRNG to export
@return CRYPT_OK if successful
*/
int dropbear_prng_export(unsigned char* UNUSED(out), unsigned long* outlen, prng_state* UNUSED(prng))
{
LTC_ARGCHK(outlen != NULL);
*outlen = 0;
return CRYPT_OK;
}
/**
Import a PRNG state
@param in The PRNG state
@param inlen Size of the state
@param prng The PRNG to import
@return CRYPT_OK if successful
*/
int dropbear_prng_import(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
{
return CRYPT_OK;
}
/**
PRNG self-test
@return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
*/
int dropbear_prng_test(void)
{
return CRYPT_OK;
}
const struct ltc_prng_descriptor dropbear_prng_desc =
{
"dropbear_prng", 0,
&dropbear_prng_start,
&dropbear_prng_add_entropy,
&dropbear_prng_ready,
&dropbear_prng_read,
&dropbear_prng_done,
&dropbear_prng_export,
&dropbear_prng_import,
&dropbear_prng_test
};
#endif // DROPBEAR_LTC_PRNG
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