294 lines
6.6 KiB
C
294 lines
6.6 KiB
C
/*
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* Convert PEM to DER
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_free free
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#define mbedtls_calloc calloc
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#define mbedtls_printf printf
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#define mbedtls_exit exit
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif /* MBEDTLS_PLATFORM_C */
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#if defined(MBEDTLS_BASE64_C) && defined(MBEDTLS_FS_IO)
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#include "mbedtls/error.h"
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#include "mbedtls/base64.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#endif
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#define DFL_FILENAME "file.pem"
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#define DFL_OUTPUT_FILENAME "file.der"
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#define USAGE \
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"\n usage: pem2der param=<>...\n" \
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"\n acceptable parameters:\n" \
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" filename=%%s default: file.pem\n" \
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" output_file=%%s default: file.der\n" \
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"\n"
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#if !defined(MBEDTLS_BASE64_C) || !defined(MBEDTLS_FS_IO)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_BASE64_C and/or MBEDTLS_FS_IO not defined.\n");
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mbedtls_exit( 0 );
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}
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#else
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/*
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* global options
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*/
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struct options
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{
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const char *filename; /* filename of the input file */
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const char *output_file; /* where to store the output */
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} opt;
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int convert_pem_to_der( const unsigned char *input, size_t ilen,
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unsigned char *output, size_t *olen )
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{
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int ret;
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const unsigned char *s1, *s2, *end = input + ilen;
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size_t len = 0;
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s1 = (unsigned char *) strstr( (const char *) input, "-----BEGIN" );
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if( s1 == NULL )
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return( -1 );
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s2 = (unsigned char *) strstr( (const char *) input, "-----END" );
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if( s2 == NULL )
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return( -1 );
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s1 += 10;
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while( s1 < end && *s1 != '-' )
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s1++;
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while( s1 < end && *s1 == '-' )
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s1++;
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if( *s1 == '\r' ) s1++;
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if( *s1 == '\n' ) s1++;
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if( s2 <= s1 || s2 > end )
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return( -1 );
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ret = mbedtls_base64_decode( NULL, 0, &len, (const unsigned char *) s1, s2 - s1 );
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if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
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return( ret );
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if( len > *olen )
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return( -1 );
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if( ( ret = mbedtls_base64_decode( output, len, &len, (const unsigned char *) s1,
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s2 - s1 ) ) != 0 )
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{
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return( ret );
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}
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*olen = len;
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return( 0 );
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}
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/*
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* Load all data from a file into a given buffer.
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*/
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static int load_file( const char *path, unsigned char **buf, size_t *n )
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{
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FILE *f;
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long size;
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if( ( f = fopen( path, "rb" ) ) == NULL )
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return( -1 );
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fseek( f, 0, SEEK_END );
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if( ( size = ftell( f ) ) == -1 )
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{
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fclose( f );
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return( -1 );
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}
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fseek( f, 0, SEEK_SET );
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*n = (size_t) size;
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if( *n + 1 == 0 ||
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( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
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{
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fclose( f );
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return( -1 );
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}
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if( fread( *buf, 1, *n, f ) != *n )
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{
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fclose( f );
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free( *buf );
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*buf = NULL;
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return( -1 );
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}
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fclose( f );
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(*buf)[*n] = '\0';
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return( 0 );
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}
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/*
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* Write buffer to a file
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*/
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static int write_file( const char *path, unsigned char *buf, size_t n )
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{
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FILE *f;
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if( ( f = fopen( path, "wb" ) ) == NULL )
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return( -1 );
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if( fwrite( buf, 1, n, f ) != n )
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{
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fclose( f );
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return( -1 );
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}
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fclose( f );
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return( 0 );
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}
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int main( int argc, char *argv[] )
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{
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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unsigned char *pem_buffer = NULL;
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unsigned char der_buffer[4096];
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char buf[1024];
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size_t pem_size, der_size = sizeof(der_buffer);
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int i;
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char *p, *q;
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/*
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* Set to sane values
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*/
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memset( buf, 0, sizeof(buf) );
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memset( der_buffer, 0, sizeof(der_buffer) );
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if( argc == 0 )
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{
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usage:
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mbedtls_printf( USAGE );
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goto exit;
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}
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opt.filename = DFL_FILENAME;
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opt.output_file = DFL_OUTPUT_FILENAME;
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for( i = 1; i < argc; i++ )
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{
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p = argv[i];
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if( ( q = strchr( p, '=' ) ) == NULL )
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goto usage;
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*q++ = '\0';
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if( strcmp( p, "filename" ) == 0 )
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opt.filename = q;
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else if( strcmp( p, "output_file" ) == 0 )
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opt.output_file = q;
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else
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goto usage;
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}
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/*
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* 1.1. Load the PEM file
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*/
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mbedtls_printf( "\n . Loading the PEM file ..." );
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fflush( stdout );
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ret = load_file( opt.filename, &pem_buffer, &pem_size );
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if( ret != 0 )
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{
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#ifdef MBEDTLS_ERROR_C
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mbedtls_strerror( ret, buf, 1024 );
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#endif
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mbedtls_printf( " failed\n ! load_file returned %d - %s\n\n", ret, buf );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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/*
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* 1.2. Convert from PEM to DER
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*/
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mbedtls_printf( " . Converting from PEM to DER ..." );
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fflush( stdout );
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if( ( ret = convert_pem_to_der( pem_buffer, pem_size, der_buffer, &der_size ) ) != 0 )
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{
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#ifdef MBEDTLS_ERROR_C
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mbedtls_strerror( ret, buf, 1024 );
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#endif
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mbedtls_printf( " failed\n ! convert_pem_to_der %d - %s\n\n", ret, buf );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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/*
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* 1.3. Write the DER file
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*/
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mbedtls_printf( " . Writing the DER file ..." );
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fflush( stdout );
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ret = write_file( opt.output_file, der_buffer, der_size );
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if( ret != 0 )
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{
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#ifdef MBEDTLS_ERROR_C
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mbedtls_strerror( ret, buf, 1024 );
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#endif
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mbedtls_printf( " failed\n ! write_file returned %d - %s\n\n", ret, buf );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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free( pem_buffer );
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#if defined(_WIN32)
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mbedtls_printf( " + Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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mbedtls_exit( exit_code );
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}
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#endif /* MBEDTLS_BASE64_C && MBEDTLS_FS_IO */
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