summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/asn1/der_put.c
blob: 54fc0cb5f86b298ca99f4042d67804fd480f0cd2 (plain)
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
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/*
 * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "der_locl.h"

RCSID("$Id$");

/*
 * All encoding functions take a pointer `p' to first position in
 * which to write, from the right, `len' which means the maximum
 * number of characters we are able to write.  The function returns
 * the number of characters written in `size' (if non-NULL).
 * The return value is 0 or an error.
 */

int
der_put_unsigned (unsigned char *p, size_t len, const unsigned *v, size_t *size)
{
    unsigned char *base = p;
    unsigned val = *v;

    if (val) {
	while (len > 0 && val) {
	    *p-- = val % 256;
	    val /= 256;
	    --len;
	}
	if (val != 0)
	    return ASN1_OVERFLOW;
	else {
	    if(p[1] >= 128) {
		if(len < 1)
		    return ASN1_OVERFLOW;
		*p-- = 0;
	    }
	    *size = base - p;
	    return 0;
	}
    } else if (len < 1)
	return ASN1_OVERFLOW;
    else {
	*p    = 0;
	*size = 1;
	return 0;
    }
}

int
der_put_integer (unsigned char *p, size_t len, const int *v, size_t *size)
{
    unsigned char *base = p;
    int val = *v;

    if(val >= 0) {
	do {
	    if(len < 1)
		return ASN1_OVERFLOW;
	    *p-- = val % 256;
	    len--;
	    val /= 256;
	} while(val);
	if(p[1] >= 128) {
	    if(len < 1)
		return ASN1_OVERFLOW;
	    *p-- = 0;
	    len--;
	}
    } else {
	val = ~val;
	do {
	    if(len < 1)
		return ASN1_OVERFLOW;
	    *p-- = ~(val % 256);
	    len--;
	    val /= 256;
	} while(val);
	if(p[1] < 128) {
	    if(len < 1)
		return ASN1_OVERFLOW;
	    *p-- = 0xff;
	    len--;
	}
    }
    *size = base - p;
    return 0;
}


int
der_put_length (unsigned char *p, size_t len, size_t val, size_t *size)
{
    if (len < 1)
	return ASN1_OVERFLOW;

    if (val < 128) {
	*p = val;
	*size = 1;
    } else {
	size_t l = 0;

	while(val > 0) {
	    if(len < 2)
		return ASN1_OVERFLOW;
	    *p-- = val % 256;
	    val /= 256;
	    len--;
	    l++;
	}
	*p = 0x80 | l;
	if(size)
	    *size = l + 1;
    }
    return 0;
}

int
der_put_boolean(unsigned char *p, size_t len, const int *data, size_t *size)
{
    if(len < 1)
	return ASN1_OVERFLOW;
    if(*data != 0)
	*p = 0xff;
    else
	*p = 0;
    *size = 1;
    return 0;
}

int
der_put_general_string (unsigned char *p, size_t len, 
			const heim_general_string *str, size_t *size)
{
    size_t slen = strlen(*str);

    if (len < slen)
	return ASN1_OVERFLOW;
    p -= slen;
    len -= slen;
    memcpy (p+1, *str, slen);
    *size = slen;
    return 0;
}

int
der_put_utf8string (unsigned char *p, size_t len, 
		    const heim_utf8_string *str, size_t *size)
{
    return der_put_general_string(p, len, str, size);
}

int
der_put_printable_string (unsigned char *p, size_t len, 
			  const heim_printable_string *str, size_t *size)
{
    return der_put_general_string(p, len, str, size);
}

int
der_put_ia5_string (unsigned char *p, size_t len, 
		    const heim_ia5_string *str, size_t *size)
{
    return der_put_general_string(p, len, str, size);
}

int
der_put_bmp_string (unsigned char *p, size_t len, 
		    const heim_bmp_string *data, size_t *size)
{
    size_t i;
    if (len / 2 < data->length)
	return ASN1_OVERFLOW;
    p -= data->length * 2;
    len -= data->length * 2;
    for (i = 0; i < data->length; i++) {
	p[1] = (data->data[i] >> 8) & 0xff;
	p[2] = data->data[i] & 0xff;
	p += 2;
    }
    if (size) *size = data->length * 2;
    return 0;
}

int
der_put_universal_string (unsigned char *p, size_t len, 
			  const heim_universal_string *data, size_t *size)
{
    size_t i;
    if (len / 4 < data->length)
	return ASN1_OVERFLOW;
    p -= data->length * 4;
    len -= data->length * 4;
    for (i = 0; i < data->length; i++) {
	p[1] = (data->data[i] >> 24) & 0xff;
	p[2] = (data->data[i] >> 16) & 0xff;
	p[3] = (data->data[i] >> 8) & 0xff;
	p[4] = data->data[i] & 0xff;
	p += 4;
    }
    if (size) *size = data->length * 4;
    return 0;
}

int
der_put_visible_string (unsigned char *p, size_t len, 
			 const heim_visible_string *str, size_t *size)
{
    return der_put_general_string(p, len, str, size);
}

int
der_put_octet_string (unsigned char *p, size_t len, 
		      const heim_octet_string *data, size_t *size)
{
    if (len < data->length)
	return ASN1_OVERFLOW;
    p -= data->length;
    len -= data->length;
    memcpy (p+1, data->data, data->length);
    *size = data->length;
    return 0;
}

int
der_put_heim_integer (unsigned char *p, size_t len, 
		     const heim_integer *data, size_t *size)
{
    unsigned char *buf = data->data;
    int hibitset = 0;

    if (data->length == 0) {
	if (len < 1)
	    return ASN1_OVERFLOW;
	*p-- = 0;
	if (size)
	    *size = 1;
	return 0;
    }
    if (len < data->length)
	return ASN1_OVERFLOW;

    len -= data->length;

    if (data->negative) {
	int i, carry;
	for (i = data->length - 1, carry = 1; i >= 0; i--) {
	    *p = buf[i] ^ 0xff;
	    if (carry)
		carry = !++*p;
	    p--;
	}
	if (p[1] < 128) {
	    if (len < 1)
		return ASN1_OVERFLOW;
	    *p-- = 0xff;
	    len--;
	    hibitset = 1;
	}
    } else {
	p -= data->length;
	memcpy(p + 1, buf, data->length);

	if (p[1] >= 128) {
	    if (len < 1)
		return ASN1_OVERFLOW;
	    p[0] = 0;
	    len--;
	    hibitset = 1;
	}
    }
    if (size)
	*size = data->length + hibitset;
    return 0;
}

int
der_put_generalized_time (unsigned char *p, size_t len, 
			  const time_t *data, size_t *size)
{
    heim_octet_string k;
    size_t l;
    int e;

    e = _heim_time2generalizedtime (*data, &k, 1);
    if (e)
	return e;
    e = der_put_octet_string(p, len, &k, &l);
    free(k.data);
    if(e)
	return e;
    if(size)
	*size = l;
    return 0;
}

int
der_put_utctime (unsigned char *p, size_t len, 
		 const time_t *data, size_t *size)
{
    heim_octet_string k;
    size_t l;
    int e;

    e = _heim_time2generalizedtime (*data, &k, 0);
    if (e)
	return e;
    e = der_put_octet_string(p, len, &k, &l);
    free(k.data);
    if(e)
	return e;
    if(size)
	*size = l;
    return 0;
}

int
der_put_oid (unsigned char *p, size_t len,
	     const heim_oid *data, size_t *size)
{
    unsigned char *base = p;
    int n;

    for (n = data->length - 1; n >= 2; --n) {
	unsigned u = data->components[n];

	if (len < 1)
	    return ASN1_OVERFLOW;
	*p-- = u % 128;
	u /= 128;
	--len;
	while (u > 0) {
	    if (len < 1)
		return ASN1_OVERFLOW;
	    *p-- = 128 + u % 128;
	    u /= 128;
	    --len;
	}
    }
    if (len < 1)
	return ASN1_OVERFLOW;
    *p-- = 40 * data->components[0] + data->components[1];
    *size = base - p;
    return 0;
}

int
der_put_tag (unsigned char *p, size_t len, Der_class class, Der_type type,
	     unsigned int tag, size_t *size)
{
    if (tag <= 30) {
	if (len < 1)
	    return ASN1_OVERFLOW;
	*p = MAKE_TAG(class, type, tag);
	*size = 1;
    } else {
	size_t ret = 0;
	unsigned int continuation = 0;
	
	do {
	    if (len < 1)
		return ASN1_OVERFLOW;
	    *p-- = tag % 128 | continuation;
	    len--;
	    ret++;
	    tag /= 128;
	    continuation = 0x80;
	} while(tag > 0);
	if (len < 1)
	    return ASN1_OVERFLOW;
	*p-- = MAKE_TAG(class, type, 0x1f);
	ret++;
	*size = ret;
    }
    return 0;
}

int
der_put_length_and_tag (unsigned char *p, size_t len, size_t len_val,
			Der_class class, Der_type type, 
			unsigned int tag, size_t *size)
{
    size_t ret = 0;
    size_t l;
    int e;

    e = der_put_length (p, len, len_val, &l);
    if(e)
	return e;
    p -= l;
    len -= l;
    ret += l;
    e = der_put_tag (p, len, class, type, tag, &l);
    if(e)
	return e;
    p -= l;
    len -= l;
    ret += l;
    *size = ret;
    return 0;
}

int
_heim_time2generalizedtime (time_t t, heim_octet_string *s, int gtimep)
{
     struct tm *tm;
     const size_t len = gtimep ? 15 : 13;

     s->data = malloc(len + 1);
     if (s->data == NULL)
	 return ENOMEM;
     s->length = len;
     tm = gmtime (&t);
     if (gtimep)
	 snprintf (s->data, len + 1, "%04d%02d%02d%02d%02d%02dZ", 
		   tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 
		   tm->tm_hour, tm->tm_min, tm->tm_sec);
     else
	 snprintf (s->data, len + 1, "%02d%02d%02d%02d%02d%02dZ", 
		   tm->tm_year % 100, tm->tm_mon + 1, tm->tm_mday, 
		   tm->tm_hour, tm->tm_min, tm->tm_sec);

     return 0;
}

int
der_put_bit_string (unsigned char *p, size_t len, 
		    const heim_bit_string *data, size_t *size)
{
    size_t data_size = (data->length + 7) / 8;
    if (len < data_size + 1)
	return ASN1_OVERFLOW;
    p -= data_size + 1;
    len -= data_size + 1;
    memcpy (p+2, data->data, data_size);
    if (data->length && (data->length % 8) != 0)
	p[1] = 8 - (data->length % 8);
    else
	p[1] = 0;
    *size = data_size + 1;
    return 0;
}

int 
_heim_der_set_sort(const void *a1, const void *a2)
{
    const struct heim_octet_string *s1 = a1, *s2 = a2;
    int ret;

    ret = memcmp(s1->data, s2->data, 
		 s1->length < s2->length ? s1->length : s2->length);
    if(ret)
	return ret;
    return s1->length - s2->length;
}