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Update dh_genprime program

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- default size 2048 bits
- make size a command-line argument
- remove warning about using own params
This commit is contained in:
Manuel Pégourié-Gonnard 2015-07-03 16:57:52 +02:00
parent cf26e211f7
commit 77c656217b
1 changed files with 50 additions and 27 deletions
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77
programs/pkey/dh_genprime.c
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@ -33,24 +33,6 @@
#define mbedtls_printf printf
#endif
#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
defined(MBEDTLS_GENPRIME)
#include "mbedtls/bignum.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <stdio.h>
#include <string.h>
#endif
/*
* Note: G = 4 is always a quadratic residue mod P,
* so it is a generator of order Q (with P = 2*Q+1).
*/
#define DH_P_SIZE 1024
#define GENERATOR "4"
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
!defined(MBEDTLS_GENPRIME)
@ -62,7 +44,28 @@ int main( void )
return( 0 );
}
#else
int main( void )
#include "mbedtls/bignum.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <stdio.h>
#include <string.h>
#define USAGE \
"\n usage: dh_genprime param=<>...\n" \
"\n acceprable parameters:\n" \
" bits=%%d default: 2048\n"
#define DFL_BITS 2048
/*
* Note: G = 4 is always a quadratic residue mod P,
* so it is a generator of order Q (with P = 2*Q+1).
*/
#define GENERATOR "4"
int main( int argc, char **argv )
{
int ret = 1;
mbedtls_mpi G, P, Q;
@ -70,24 +73,44 @@ int main( void )
mbedtls_ctr_drbg_context ctr_drbg;
const char *pers = "dh_genprime";
FILE *fout;
int nbits = DFL_BITS;
int i;
char *p, *q;
mbedtls_mpi_init( &G ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_entropy_init( &entropy );
if( argc == 0 )
{
usage:
mbedtls_printf( USAGE );
return( 1 );
}
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
if( strcmp( p, "bits" ) == 0 )
{
nbits = atoi( q );
if( nbits < 0 || nbits > MBEDTLS_MPI_MAX_BITS )
goto usage;
}
else
goto usage;
}
if( ( ret = mbedtls_mpi_read_string( &G, 10, GENERATOR ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_read_string returned %d\n", ret );
goto exit;
}
mbedtls_printf( "\nWARNING: You should not generate and use your own DHM primes\n" );
mbedtls_printf( " unless you are very certain of what you are doing!\n" );
mbedtls_printf( " Failing to follow this instruction may result in\n" );
mbedtls_printf( " weak security for your connections! Use the\n" );
mbedtls_printf( " predefined DHM parameters from dhm.h instead!\n\n" );
mbedtls_printf( "============================================================\n\n" );
mbedtls_printf( " ! Generating large primes may take minutes!\n" );
mbedtls_printf( "\n . Seeding the random number generator..." );
@ -107,7 +130,7 @@ int main( void )
/*
* This can take a long time...
*/
if( ( ret = mbedtls_mpi_gen_prime( &P, DH_P_SIZE, 1,
if( ( ret = mbedtls_mpi_gen_prime( &P, nbits, 1,
mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_gen_prime returned %d\n\n", ret );