mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-27 02:24:16 +01:00
263 lines
9.1 KiB
C
263 lines
9.1 KiB
C
/*
|
|
* HAVEGE: HArdware Volatile Entropy Gathering and Expansion
|
|
*
|
|
* Copyright (C) 2006-2010, Paul Bakker <polarssl_maintainer at polarssl.org>
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
/*
|
|
* The HAVEGE RNG was designed by Andre Seznec in 2002.
|
|
*
|
|
* http://www.irisa.fr/caps/projects/hipsor/publi.php
|
|
*
|
|
* Contact: seznec(at)irisa_dot_fr - orocheco(at)irisa_dot_fr
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "polarssl/config.h"
|
|
|
|
#if defined(POLARSSL_HAVEGE_C)
|
|
|
|
#include "polarssl/havege.h"
|
|
#include "polarssl/timing.h"
|
|
|
|
/* ------------------------------------------------------------------------
|
|
* On average, one iteration accesses two 8-word blocks in the havege WALK
|
|
* table, and generates 16 words in the RES array.
|
|
*
|
|
* The data read in the WALK table is updated and permuted after each use.
|
|
* The result of the hardware clock counter read is used for this update.
|
|
*
|
|
* 25 conditional tests are present. The conditional tests are grouped in
|
|
* two nested groups of 12 conditional tests and 1 test that controls the
|
|
* permutation; on average, there should be 6 tests executed and 3 of them
|
|
* should be mispredicted.
|
|
* ------------------------------------------------------------------------
|
|
*/
|
|
|
|
#define SWAP(X,Y) { int *T = X; X = Y; Y = T; }
|
|
|
|
#define TST1_ENTER if( PTEST & 1 ) { PTEST ^= 3; PTEST >>= 1;
|
|
#define TST2_ENTER if( PTEST & 1 ) { PTEST ^= 3; PTEST >>= 1;
|
|
|
|
#define TST1_LEAVE U1++; }
|
|
#define TST2_LEAVE U2++; }
|
|
|
|
#define ONE_ITERATION \
|
|
\
|
|
PTEST = PT1 >> 20; \
|
|
\
|
|
TST1_ENTER TST1_ENTER TST1_ENTER TST1_ENTER \
|
|
TST1_ENTER TST1_ENTER TST1_ENTER TST1_ENTER \
|
|
TST1_ENTER TST1_ENTER TST1_ENTER TST1_ENTER \
|
|
\
|
|
TST1_LEAVE TST1_LEAVE TST1_LEAVE TST1_LEAVE \
|
|
TST1_LEAVE TST1_LEAVE TST1_LEAVE TST1_LEAVE \
|
|
TST1_LEAVE TST1_LEAVE TST1_LEAVE TST1_LEAVE \
|
|
\
|
|
PTX = (PT1 >> 18) & 7; \
|
|
PT1 &= 0x1FFF; \
|
|
PT2 &= 0x1FFF; \
|
|
CLK = (int) hardclock(); \
|
|
\
|
|
i = 0; \
|
|
A = &WALK[PT1 ]; RES[i++] ^= *A; \
|
|
B = &WALK[PT2 ]; RES[i++] ^= *B; \
|
|
C = &WALK[PT1 ^ 1]; RES[i++] ^= *C; \
|
|
D = &WALK[PT2 ^ 4]; RES[i++] ^= *D; \
|
|
\
|
|
IN = (*A >> (1)) ^ (*A << (31)) ^ CLK; \
|
|
*A = (*B >> (2)) ^ (*B << (30)) ^ CLK; \
|
|
*B = IN ^ U1; \
|
|
*C = (*C >> (3)) ^ (*C << (29)) ^ CLK; \
|
|
*D = (*D >> (4)) ^ (*D << (28)) ^ CLK; \
|
|
\
|
|
A = &WALK[PT1 ^ 2]; RES[i++] ^= *A; \
|
|
B = &WALK[PT2 ^ 2]; RES[i++] ^= *B; \
|
|
C = &WALK[PT1 ^ 3]; RES[i++] ^= *C; \
|
|
D = &WALK[PT2 ^ 6]; RES[i++] ^= *D; \
|
|
\
|
|
if( PTEST & 1 ) SWAP( A, C ); \
|
|
\
|
|
IN = (*A >> (5)) ^ (*A << (27)) ^ CLK; \
|
|
*A = (*B >> (6)) ^ (*B << (26)) ^ CLK; \
|
|
*B = IN; CLK = (int) hardclock(); \
|
|
*C = (*C >> (7)) ^ (*C << (25)) ^ CLK; \
|
|
*D = (*D >> (8)) ^ (*D << (24)) ^ CLK; \
|
|
\
|
|
A = &WALK[PT1 ^ 4]; \
|
|
B = &WALK[PT2 ^ 1]; \
|
|
\
|
|
PTEST = PT2 >> 1; \
|
|
\
|
|
PT2 = (RES[(i - 8) ^ PTY] ^ WALK[PT2 ^ PTY ^ 7]); \
|
|
PT2 = ((PT2 & 0x1FFF) & (~8)) ^ ((PT1 ^ 8) & 0x8); \
|
|
PTY = (PT2 >> 10) & 7; \
|
|
\
|
|
TST2_ENTER TST2_ENTER TST2_ENTER TST2_ENTER \
|
|
TST2_ENTER TST2_ENTER TST2_ENTER TST2_ENTER \
|
|
TST2_ENTER TST2_ENTER TST2_ENTER TST2_ENTER \
|
|
\
|
|
TST2_LEAVE TST2_LEAVE TST2_LEAVE TST2_LEAVE \
|
|
TST2_LEAVE TST2_LEAVE TST2_LEAVE TST2_LEAVE \
|
|
TST2_LEAVE TST2_LEAVE TST2_LEAVE TST2_LEAVE \
|
|
\
|
|
C = &WALK[PT1 ^ 5]; \
|
|
D = &WALK[PT2 ^ 5]; \
|
|
\
|
|
RES[i++] ^= *A; \
|
|
RES[i++] ^= *B; \
|
|
RES[i++] ^= *C; \
|
|
RES[i++] ^= *D; \
|
|
\
|
|
IN = (*A >> ( 9)) ^ (*A << (23)) ^ CLK; \
|
|
*A = (*B >> (10)) ^ (*B << (22)) ^ CLK; \
|
|
*B = IN ^ U2; \
|
|
*C = (*C >> (11)) ^ (*C << (21)) ^ CLK; \
|
|
*D = (*D >> (12)) ^ (*D << (20)) ^ CLK; \
|
|
\
|
|
A = &WALK[PT1 ^ 6]; RES[i++] ^= *A; \
|
|
B = &WALK[PT2 ^ 3]; RES[i++] ^= *B; \
|
|
C = &WALK[PT1 ^ 7]; RES[i++] ^= *C; \
|
|
D = &WALK[PT2 ^ 7]; RES[i++] ^= *D; \
|
|
\
|
|
IN = (*A >> (13)) ^ (*A << (19)) ^ CLK; \
|
|
*A = (*B >> (14)) ^ (*B << (18)) ^ CLK; \
|
|
*B = IN; \
|
|
*C = (*C >> (15)) ^ (*C << (17)) ^ CLK; \
|
|
*D = (*D >> (16)) ^ (*D << (16)) ^ CLK; \
|
|
\
|
|
PT1 = ( RES[(i - 8) ^ PTX] ^ \
|
|
WALK[PT1 ^ PTX ^ 7] ) & (~1); \
|
|
PT1 ^= (PT2 ^ 0x10) & 0x10; \
|
|
\
|
|
for( n++, i = 0; i < 16; i++ ) \
|
|
hs->pool[n % COLLECT_SIZE] ^= RES[i];
|
|
|
|
/*
|
|
* Entropy gathering function
|
|
*/
|
|
static void havege_fill( havege_state *hs )
|
|
{
|
|
int i, n = 0;
|
|
int U1, U2, *A, *B, *C, *D;
|
|
int PT1, PT2, *WALK, RES[16];
|
|
int PTX, PTY, CLK, PTEST, IN;
|
|
|
|
WALK = hs->WALK;
|
|
PT1 = hs->PT1;
|
|
PT2 = hs->PT2;
|
|
|
|
PTX = U1 = 0;
|
|
PTY = U2 = 0;
|
|
|
|
memset( RES, 0, sizeof( RES ) );
|
|
|
|
while( n < COLLECT_SIZE * 4 )
|
|
{
|
|
ONE_ITERATION
|
|
ONE_ITERATION
|
|
ONE_ITERATION
|
|
ONE_ITERATION
|
|
}
|
|
|
|
hs->PT1 = PT1;
|
|
hs->PT2 = PT2;
|
|
|
|
hs->offset[0] = 0;
|
|
hs->offset[1] = COLLECT_SIZE / 2;
|
|
}
|
|
|
|
/*
|
|
* HAVEGE initialization
|
|
*/
|
|
void havege_init( havege_state *hs )
|
|
{
|
|
memset( hs, 0, sizeof( havege_state ) );
|
|
|
|
havege_fill( hs );
|
|
}
|
|
|
|
/*
|
|
* HAVEGE rand function
|
|
*/
|
|
int havege_rand( void *p_rng )
|
|
{
|
|
int ret;
|
|
havege_state *hs = (havege_state *) p_rng;
|
|
|
|
if( hs->offset[1] >= COLLECT_SIZE )
|
|
havege_fill( hs );
|
|
|
|
ret = hs->pool[hs->offset[0]++];
|
|
ret ^= hs->pool[hs->offset[1]++];
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(POLARSSL_RAND_TEST)
|
|
|
|
#include <stdio.h>
|
|
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
FILE *f;
|
|
time_t t;
|
|
int i, j, k;
|
|
havege_state hs;
|
|
unsigned char buf[1024];
|
|
|
|
if( argc < 2 )
|
|
{
|
|
fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
|
|
return( 1 );
|
|
}
|
|
|
|
if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
|
|
{
|
|
printf( "failed to open '%s' for writing.\n", argv[0] );
|
|
return( 1 );
|
|
}
|
|
|
|
havege_init( &hs );
|
|
|
|
t = time( NULL );
|
|
|
|
for( i = 0, k = 32768; i < k; i++ )
|
|
{
|
|
for( j = 0; j < sizeof( buf ); j++ )
|
|
buf[j] = havege_rand( &hs );
|
|
|
|
fwrite( buf, sizeof( buf ), 1, f );
|
|
|
|
printf( "Generating 32Mb of data in file '%s'... %04.1f" \
|
|
"%% done\r", argv[1], (100 * (float) (i + 1)) / k );
|
|
fflush( stdout );
|
|
}
|
|
|
|
if( t == time( NULL ) )
|
|
t--;
|
|
|
|
fclose( f );
|
|
return( 0 );
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|