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Add option 'use_dev_random' to gen_key application

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This commit is contained in:
Paul Bakker 2014-04-09 15:25:13 +02:00
parent ddd427a8fc
commit 1cfc45835f
2 changed files with 76 additions and 0 deletions
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1
ChangeLog
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@ -6,6 +6,7 @@ ABI Alert: ALPN changes the ABI for the next release.
Features
* Support for the ALPN SSL extension
* Add option 'use_dev_random' to gen_key application
Changes
* x509_crt_info() now prints information about parsed extensions as well

75
programs/pkey/gen_key.c
View File

@ -29,6 +29,10 @@
#include <stdlib.h>
#include <stdio.h>
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
#include <unistd.h>
#endif /* !_WIN32 && POLARSSL_FS_IO */
#include "polarssl/error.h"
#include "polarssl/pk.h"
#include "polarssl/ecdsa.h"
@ -59,6 +63,7 @@ int main( int argc, char *argv[] )
#define DFL_EC_CURVE ecp_curve_list()->grp_id
#define DFL_FILENAME "keyfile.key"
#define DFL_FORMAT FORMAT_PEM
#define DFL_USE_DEV_RANDOM 0
/*
* global options
@ -70,8 +75,48 @@ struct options
int ec_curve; /* curve identifier for EC keys */
const char *filename; /* filename of the key file */
int format; /* the output format to use */
int use_dev_random; /* use /dev/random as entropy source */
} opt;
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
#define DEV_RANDOM_THRESHOLD 32
int dev_random_entropy_poll( void *data, unsigned char *output,
size_t len, size_t *olen )
{
FILE *file;
size_t ret, left = len;
unsigned char *p = output;
((void) data);
*olen = 0;
file = fopen( "/dev/random", "rb" );
if( file == NULL )
return( POLARSSL_ERR_ENTROPY_SOURCE_FAILED );
while( left > 0 )
{
/* /dev/random can return much less than requested. If so, try again */
ret = fread( p, 1, left, file );
if( ret == 0 && ferror( file ) )
{
fclose( file );
return( POLARSSL_ERR_ENTROPY_SOURCE_FAILED );
}
p += ret;
left -= ret;
sleep( 1 );
}
fclose( file );
*olen = len;
return( 0 );
}
#endif /* !_WIN32 && POLARSSL_FS_IO */
static int write_private_key( pk_context *key, const char *output_file )
{
int ret;
@ -108,6 +153,13 @@ static int write_private_key( pk_context *key, const char *output_file )
return( 0 );
}
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
#define USAGE_DEV_RANDOM \
" use_dev_random=0|1 default: 0\n"
#else
#define USAGE_DEV_RANDOM ""
#endif /* !_WIN32 && POLARSSL_FS_IO */
#define USAGE \
"\n usage: gen_key param=<>...\n" \
"\n acceptable parameters:\n" \
@ -116,6 +168,7 @@ static int write_private_key( pk_context *key, const char *output_file )
" ec_curve=%%s see below\n" \
" filename=%%s default: keyfile.key\n" \
" format=pem|der default: pem\n" \
USAGE_DEV_RANDOM \
"\n"
int main( int argc, char *argv[] )
@ -158,6 +211,7 @@ int main( int argc, char *argv[] )
opt.ec_curve = DFL_EC_CURVE;
opt.filename = DFL_FILENAME;
opt.format = DFL_FORMAT;
opt.use_dev_random = DFL_USE_DEV_RANDOM;
for( i = 1; i < argc; i++ )
{
@ -198,6 +252,12 @@ int main( int argc, char *argv[] )
}
else if( strcmp( p, "filename" ) == 0 )
opt.filename = q;
else if( strcmp( p, "use_dev_random" ) == 0 )
{
opt.use_dev_random = atoi( q );
if( opt.use_dev_random < 0 || opt.use_dev_random > 1 )
goto usage;
}
else
goto usage;
}
@ -206,6 +266,21 @@ int main( int argc, char *argv[] )
fflush( stdout );
entropy_init( &entropy );
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
if( opt.use_dev_random )
{
if( ( ret = entropy_add_source( &entropy, dev_random_entropy_poll,
NULL, DEV_RANDOM_THRESHOLD ) ) != 0 )
{
printf( " failed\n ! entropy_add_source returned -0x%04x\n", -ret );
goto exit;
}
printf("\n Using /dev/random, so can take a long time! " );
fflush( stdout );
}
#endif /* !_WIN32 && POLARSSL_FS_IO */
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )