mirror of
http://galexander.org/git/simplesshd.git
synced 2024-11-30 11:18:12 +00:00
137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/* 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 "includes.h"
|
|
#include "dbrandom.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.
|
|
*/
|
|
|
|
#if 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 */
|