/* 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 "tomcrypt.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 SPRNG
const
struct
ltc_prng_descriptor sprng_desc =
{
"sprng"
, 0,
&sprng_start,
&sprng_add_entropy,
&sprng_ready,
&sprng_read,
&sprng_done,
&sprng_export,
&sprng_import,
&sprng_test
};
/**
Start the PRNG
@param prng [out] The PRNG state to initialize
@return CRYPT_OK if successful
*/
int
sprng_start(prng_state *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
sprng_add_entropy(
const
unsigned
char
*in, unsigned
long
inlen, prng_state *prng)
{
return
CRYPT_OK;
}
/**
Make the PRNG ready to read from
@param prng The PRNG to make active
@return CRYPT_OK if successful
*/
int
sprng_ready(prng_state *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
sprng_read(unsigned
char
*out, unsigned
long
outlen, prng_state *prng)
{
LTC_ARGCHK(out != NULL);
return
rng_get_bytes(out, outlen, NULL);
}
/**
Terminate the PRNG
@param prng The PRNG to terminate
@return CRYPT_OK if successful
*/
int
sprng_done(prng_state *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
sprng_export(unsigned
char
*out, unsigned
long
*outlen, prng_state *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
sprng_import(
const
unsigned
char
*in, unsigned
long
inlen, prng_state *prng)
{
return
CRYPT_OK;
}
/**
PRNG self-test
@return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
*/
int
sprng_test(
void
)
{
return
CRYPT_OK;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/prngs/sprng.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2006/03/31 14:15:35 $ */