mbedtls/programs/util/pem2der.c

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/*
* Convert PEM to DER
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: 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.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "polarssl/error.h"
#include "polarssl/base64.h"
#define DFL_FILENAME "file.pem"
#define DFL_OUTPUT_FILENAME "file.der"
#if !defined(POLARSSL_BASE64_C) || !defined(POLARSSL_FS_IO)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_BASE64_C and/or POLARSSL_FS_IO not defined.\n");
return( 0 );
}
#else
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/*
* global options
*/
struct options
{
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const char *filename; /* filename of the input file */
const char *output_file; /* where to store the output */
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} opt;
int convert_pem_to_der( const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen )
{
int ret;
const unsigned char *s1, *s2, *end = input + ilen;
size_t len = 0;
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s1 = (unsigned char *) strstr( (const char *) input, "-----BEGIN" );
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if( s1 == NULL )
return( -1 );
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s2 = (unsigned char *) strstr( (const char *) input, "-----END" );
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if( s2 == NULL )
return( -1 );
s1 += 10;
while( s1 < end && *s1 != '-' )
s1++;
while( s1 < end && *s1 == '-' )
s1++;
if( *s1 == '\r' ) s1++;
if( *s1 == '\n' ) s1++;
if( s2 <= s1 || s2 > end )
return( -1 );
ret = base64_decode( NULL, &len, (const unsigned char *) s1, s2 - s1 );
if( ret == POLARSSL_ERR_BASE64_INVALID_CHARACTER )
return( ret );
if( len > *olen )
return( -1 );
if( ( ret = base64_decode( output, &len, (const unsigned char *) s1,
s2 - s1 ) ) != 0 )
{
return( ret );
}
*olen = len;
return( 0 );
}
/*
* Load all data from a file into a given buffer.
*/
static int load_file( const char *path, unsigned char **buf, size_t *n )
{
FILE *f;
long size;
if( ( f = fopen( path, "rb" ) ) == NULL )
return( -1 );
fseek( f, 0, SEEK_END );
if( ( size = ftell( f ) ) == -1 )
{
fclose( f );
return( -1 );
}
fseek( f, 0, SEEK_SET );
*n = (size_t) size;
if( *n + 1 == 0 ||
( *buf = (unsigned char *) malloc( *n + 1 ) ) == NULL )
{
fclose( f );
return( -1 );
}
if( fread( *buf, 1, *n, f ) != *n )
{
fclose( f );
free( *buf );
*buf = NULL;
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return( -1 );
}
fclose( f );
(*buf)[*n] = '\0';
return( 0 );
}
/*
* Write buffer to a file
*/
static int write_file( const char *path, unsigned char *buf, size_t n )
{
FILE *f;
if( ( f = fopen( path, "wb" ) ) == NULL )
return( -1 );
if( fwrite( buf, 1, n, f ) != n )
{
fclose( f );
return( -1 );
}
fclose( f );
return( 0 );
}
#define USAGE \
"\n usage: pem2der param=<>...\n" \
"\n acceptable parameters:\n" \
" filename=%%s default: file.pem\n" \
" output_file=%%s default: file.der\n" \
"\n"
int main( int argc, char *argv[] )
{
int ret = 0;
unsigned char *pem_buffer = NULL;
unsigned char der_buffer[4096];
char buf[1024];
size_t pem_size, der_size = sizeof(der_buffer);
int i;
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char *p, *q;
/*
* Set to sane values
*/
memset( buf, 0, sizeof(buf) );
memset( der_buffer, 0, sizeof(der_buffer) );
if( argc == 0 )
{
usage:
printf( USAGE );
goto exit;
}
opt.filename = DFL_FILENAME;
opt.output_file = DFL_OUTPUT_FILENAME;
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
if( strcmp( p, "filename" ) == 0 )
opt.filename = q;
else if( strcmp( p, "output_file" ) == 0 )
opt.output_file = q;
else
goto usage;
}
/*
* 1.1. Load the PEM file
*/
printf( "\n . Loading the PEM file ..." );
fflush( stdout );
ret = load_file( opt.filename, &pem_buffer, &pem_size );
if( ret != 0 )
{
#ifdef POLARSSL_ERROR_C
polarssl_strerror( ret, buf, 1024 );
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#endif
printf( " failed\n ! load_file returned %d - %s\n\n", ret, buf );
goto exit;
}
printf( " ok\n" );
/*
* 1.2. Convert from PEM to DER
*/
printf( " . Converting from PEM to DER ..." );
fflush( stdout );
if( ( ret = convert_pem_to_der( pem_buffer, pem_size, der_buffer, &der_size ) ) != 0 )
{
#ifdef POLARSSL_ERROR_C
polarssl_strerror( ret, buf, 1024 );
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#endif
printf( " failed\n ! convert_pem_to_der %d - %s\n\n", ret, buf );
goto exit;
}
printf( " ok\n" );
/*
* 1.3. Write the DER file
*/
printf( " . Writing the DER file ..." );
fflush( stdout );
ret = write_file( opt.output_file, der_buffer, der_size );
if( ret != 0 )
{
#ifdef POLARSSL_ERROR_C
polarssl_strerror( ret, buf, 1024 );
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#endif
printf( " failed\n ! write_file returned %d - %s\n\n", ret, buf );
goto exit;
}
printf( " ok\n" );
exit:
free( pem_buffer );
#if defined(_WIN32)
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_BASE64_C && POLARSSL_FS_IO */