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/*
* Convert PEM to DER
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_free free
#define mbedtls_calloc calloc
#define mbedtls_printf printf
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */
#if defined(MBEDTLS_BASE64_C) && defined(MBEDTLS_FS_IO)
#include "mbedtls/error.h"
#include "mbedtls/base64.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#define DFL_FILENAME "file.pem"
#define DFL_OUTPUT_FILENAME "file.der"
#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"
#if !defined(MBEDTLS_BASE64_C) || !defined(MBEDTLS_FS_IO)
int main( void )
{
mbedtls_printf("MBEDTLS_BASE64_C and/or MBEDTLS_FS_IO not defined.\n");
return( 0 );
}
#else
/*
* global options
*/
struct options
{
const char *filename; /* filename of the input file */
const char *output_file; /* where to store the output */
} 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;
s1 = (unsigned char *) strstr( (const char *) input, "-----BEGIN" );
if( s1 == NULL )
return( -1 );
s2 = (unsigned char *) strstr( (const char *) input, "-----END" );
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 = mbedtls_base64_decode( NULL, 0, &len, (const unsigned char *) s1, s2 - s1 );
if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
return( ret );
if( len > *olen )
return( -1 );
if( ( ret = mbedtls_base64_decode( output, len, &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 = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
{
fclose( f );
return( -1 );
}
if( fread( *buf, 1, *n, f ) != *n )
{
fclose( f );
free( *buf );
*buf = NULL;
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 );
}
int main( int argc, char *argv[] )
{
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
unsigned char *pem_buffer = NULL;
unsigned char der_buffer[4096];
char buf[1024];
size_t pem_size, der_size = sizeof(der_buffer);
int i;
char *p, *q;
/*
* Set to sane values
*/
memset( buf, 0, sizeof(buf) );
memset( der_buffer, 0, sizeof(der_buffer) );
if( argc == 0 )
{
usage:
mbedtls_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
*/
mbedtls_printf( "\n . Loading the PEM file ..." );
fflush( stdout );
ret = load_file( opt.filename, &pem_buffer, &pem_size );
if( ret != 0 )
{
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror( ret, buf, 1024 );
#endif
mbedtls_printf( " failed\n ! load_file returned %d - %s\n\n", ret, buf );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1.2. Convert from PEM to DER
*/
mbedtls_printf( " . Converting from PEM to DER ..." );
fflush( stdout );
if( ( ret = convert_pem_to_der( pem_buffer, pem_size, der_buffer, &der_size ) ) != 0 )
{
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror( ret, buf, 1024 );
#endif
mbedtls_printf( " failed\n ! convert_pem_to_der %d - %s\n\n", ret, buf );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1.3. Write the DER file
*/
mbedtls_printf( " . Writing the DER file ..." );
fflush( stdout );
ret = write_file( opt.output_file, der_buffer, der_size );
if( ret != 0 )
{
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror( ret, buf, 1024 );
#endif
mbedtls_printf( " failed\n ! write_file returned %d - %s\n\n", ret, buf );
goto exit;
}
mbedtls_printf( " ok\n" );
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
free( pem_buffer );
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( exit_code );
}
#endif /* MBEDTLS_BASE64_C && MBEDTLS_FS_IO */