forked from Mbed-TLS/mbedtls
-
Notifications
You must be signed in to change notification settings - Fork 0
/
pem2der.c
293 lines (239 loc) · 6.6 KB
/
pem2der.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
/*
* 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 */