/* * Convert PEM to DER * * Copyright The Mbed TLS Contributors * 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. */ #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 exit #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"); mbedtls_exit( 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 mbedtls_exit( exit_code ); } #endif /* MBEDTLS_BASE64_C && MBEDTLS_FS_IO */