px5g-standalone: use /dev/urandom instead of havege (fixes #20216)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 47025

3 files changed, 20 insertions, 358 deletions

diff --git a/package/utils/px5g-standalone/src/library/havege.c b/package/utils/px5g-standalone/src/library/havege.c
deleted file mode 100644
index 266299d..0000000
--- a/package/utils/px5g-standalone/src/library/havege.c
+++ /dev/null
@@ -1,276 +0,0 @@
-/*
- *  HAVEGE: HArdware Volatile Entropy Gathering and Expansion
- *
- *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
- *
- *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
- *
- *  All rights reserved.
- *
- *  Redistribution and use in source and binary forms, with or without
- *  modification, are permitted provided that the following conditions
- *  are met:
- *  
- *    * Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *    * Redistributions in binary form must reproduce the above copyright
- *      notice, this list of conditions and the following disclaimer in the
- *      documentation and/or other materials provided with the distribution.
- *    * Neither the names of PolarSSL or XySSL nor the names of its contributors
- *      may be used to endorse or promote products derived from this software
- *      without specific prior written permission.
- *  
- *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- *  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-/*
- *  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
diff --git a/package/utils/px5g-standalone/src/polarssl/havege.h b/package/utils/px5g-standalone/src/polarssl/havege.h
deleted file mode 100644
index c27ceca..0000000
--- a/package/utils/px5g-standalone/src/polarssl/havege.h
+++ /dev/null
@@ -1,75 +0,0 @@
-/**
- * \file havege.h
- *
- *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
- *
- *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
- *
- *  All rights reserved.
- *
- *  Redistribution and use in source and binary forms, with or without
- *  modification, are permitted provided that the following conditions
- *  are met:
- *  
- *    * Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *    * Redistributions in binary form must reproduce the above copyright
- *      notice, this list of conditions and the following disclaimer in the
- *      documentation and/or other materials provided with the distribution.
- *    * Neither the names of PolarSSL or XySSL nor the names of its contributors
- *      may be used to endorse or promote products derived from this software
- *      without specific prior written permission.
- *  
- *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- *  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef POLARSSL_HAVEGE_H
-#define POLARSSL_HAVEGE_H
-
-#define COLLECT_SIZE 1024
-
-/**
- * \brief          HAVEGE state structure
- */
-typedef struct
-{
-    int PT1, PT2, offset[2];
-    int pool[COLLECT_SIZE];
-    int WALK[8192];
-}
-havege_state;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * \brief          HAVEGE initialization
- *
- * \param hs       HAVEGE state to be initialized
- */
-void havege_init( havege_state *hs );
-
-/**
- * \brief          HAVEGE rand function
- *
- * \param rng_st   points to an HAVEGE state
- *
- * \return         A random int
- */
-int havege_rand( void *p_rng );
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* havege.h */
diff --git a/package/utils/px5g-standalone/src/px5g.c b/package/utils/px5g-standalone/src/px5g.c
index cf50ad2..34ab34f 100644
--- a/package/utils/px5g-standalone/src/px5g.c
+++ b/package/utils/px5g-standalone/src/px5g.c
@@ -23,7 +23,8 @@
 #include <string.h>
 #include <time.h>
 #include <limits.h>
-#include "polarssl/havege.h"
+#include <fcntl.h>
+#include <unistd.h>
 #include "polarssl/bignum.h"
 #include "polarssl/x509.h"
 #include "polarssl/rsa.h"
@@ -32,8 +33,17 @@
 #define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
 #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
 
+static int urandom_fd;
+
+static int _urandom(void *ctx)
+{
+	int ret;
+	read(urandom_fd, &ret, sizeof(ret));
+	return ret;
+}
+
+
 int rsakey(char **arg) {
-	havege_state hs;
 	rsa_context rsa;
 
 	unsigned int ksize = 512;
@@ -57,8 +67,7 @@ int rsakey(char **arg) {
 		ksize = (unsigned int)atoi(*arg);
 	}
 
-	havege_init(&hs);
-	rsa_init(&rsa, RSA_PKCS_V15, 0, havege_rand, &hs);
+	rsa_init(&rsa, RSA_PKCS_V15, 0, _urandom, NULL);
 
 	fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
 	if (rsa_gen_key(&rsa, ksize, exp)) {
@@ -76,7 +85,6 @@ int rsakey(char **arg) {
 }
 
 int selfsigned(char **arg) {
-	havege_state hs;
 	rsa_context rsa;
 	x509_node node;
 
@@ -139,8 +147,7 @@ int selfsigned(char **arg) {
 		arg++;
 	}
 
-	havege_init(&hs);
-	rsa_init(&rsa, RSA_PKCS_V15, 0, havege_rand, &hs);
+	rsa_init(&rsa, RSA_PKCS_V15, 0, _urandom, NULL);
 	x509write_init_node(&node);
 	fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
 	if (rsa_gen_key(&rsa, ksize, exp)) {
@@ -184,6 +191,12 @@ int selfsigned(char **arg) {
 }
 
 int main(int argc, char *argv[]) {
+	urandom_fd = open("/dev/urandom", O_RDONLY);
+	if (urandom_fd < 0) {
+		perror("open(/dev/urandom)");
+		return 1;
+	}
+
 	if (!argv[1]) {
 		//Usage
 	} else if (!strcmp(argv[1], "rsakey")) {