2
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5
/* ====================================================================
6
* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8
* Redistribution and use in source and binary forms, with or without
9
* modification, are permitted provided that the following conditions
12
* 1. Redistributions of source code must retain the above copyright
13
* notice, this list of conditions and the following disclaimer.
15
* 2. Redistributions in binary form must reproduce the above copyright
16
* notice, this list of conditions and the following disclaimer in
17
* the documentation and/or other materials provided with the
20
* 3. All advertising materials mentioning features or use of this
21
* software must display the following acknowledgment:
22
* "This product includes software developed by the OpenSSL Project
23
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26
* endorse or promote products derived from this software without
27
* prior written permission. For written permission, please contact
28
* licensing@OpenSSL.org.
30
* 5. Products derived from this software may not be called "OpenSSL"
31
* nor may "OpenSSL" appear in their names without prior written
32
* permission of the OpenSSL Project.
34
* 6. Redistributions of any form whatsoever must retain the following
36
* "This product includes software developed by the OpenSSL Project
37
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50
* OF THE POSSIBILITY OF SUCH DAMAGE.
51
* ====================================================================
53
* This product includes cryptographic software written by Eric Young
54
* (eay@cryptsoft.com). This product includes software written by Tim
55
* Hudson (tjh@cryptsoft.com).
59
/* Experimental ASN1 BIO. When written through the data is converted
60
* to an ASN1 string type: default is OCTET STRING. Additional functions
61
* can be provided to add prefix and suffix data.
65
#include <openssl/bio.h>
66
#include <openssl/asn1.h>
68
/* Must be large enough for biggest tag+length */
69
#define DEFAULT_ASN1_BUF_SIZE 20
76
ASN1_STATE_HEADER_COPY,
82
typedef struct BIO_ASN1_EX_FUNCS_st
84
asn1_ps_func *ex_func;
85
asn1_ps_func *ex_free_func;
88
typedef struct BIO_ASN1_BUF_CTX_t
91
asn1_bio_state_t state;
96
/* Current position in buffer */
98
/* Current buffer length */
100
/* Amount of data to copy */
102
/* Class and tag to use */
103
int asn1_class, asn1_tag;
104
asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
105
/* Extra buffer for prefix and suffix data */
106
unsigned char *ex_buf;
113
static int asn1_bio_write(BIO *h, const char *buf,int num);
114
static int asn1_bio_read(BIO *h, char *buf, int size);
115
static int asn1_bio_puts(BIO *h, const char *str);
116
static int asn1_bio_gets(BIO *h, char *str, int size);
117
static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
118
static int asn1_bio_new(BIO *h);
119
static int asn1_bio_free(BIO *data);
120
static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
122
static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
123
static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
124
asn1_ps_func *cleanup, asn1_bio_state_t next);
125
static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
127
asn1_bio_state_t ex_state,
128
asn1_bio_state_t other_state);
130
static BIO_METHOD methods_asn1=
141
asn1_bio_callback_ctrl,
144
BIO_METHOD *BIO_f_asn1(void)
146
return(&methods_asn1);
150
static int asn1_bio_new(BIO *b)
152
BIO_ASN1_BUF_CTX *ctx;
153
ctx = OPENSSL_malloc(sizeof(BIO_ASN1_BUF_CTX));
156
if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE))
159
b->ptr = (char *)ctx;
164
static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
166
ctx->buf = OPENSSL_malloc(size);
173
ctx->asn1_class = V_ASN1_UNIVERSAL;
174
ctx->asn1_tag = V_ASN1_OCTET_STRING;
178
ctx->state = ASN1_STATE_START;
182
static int asn1_bio_free(BIO *b)
184
BIO_ASN1_BUF_CTX *ctx;
185
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
189
OPENSSL_free(ctx->buf);
197
static int asn1_bio_write(BIO *b, const char *in , int inl)
199
BIO_ASN1_BUF_CTX *ctx;
200
int wrmax, wrlen, ret;
202
if (!in || (inl < 0) || (b->next_bio == NULL))
204
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
216
/* Setup prefix data, call it */
217
case ASN1_STATE_START:
218
if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
219
ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
223
/* Copy any pre data first */
224
case ASN1_STATE_PRE_COPY:
226
ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
234
case ASN1_STATE_HEADER:
236
ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
237
OPENSSL_assert(ctx->buflen <= ctx->bufsize);
239
ASN1_put_object(&p, 0, inl,
240
ctx->asn1_tag, ctx->asn1_class);
242
ctx->state = ASN1_STATE_HEADER_COPY;
246
case ASN1_STATE_HEADER_COPY:
247
ret = BIO_write(b->next_bio,
248
ctx->buf + ctx->bufpos, ctx->buflen);
258
ctx->state = ASN1_STATE_DATA_COPY;
263
case ASN1_STATE_DATA_COPY:
265
if (inl > ctx->copylen)
266
wrmax = ctx->copylen;
269
ret = BIO_write(b->next_bio, in, wrmax);
277
if (ctx->copylen == 0)
278
ctx->state = ASN1_STATE_HEADER;
286
BIO_clear_retry_flags(b);
294
BIO_clear_retry_flags(b);
295
BIO_copy_next_retry(b);
297
return (wrlen > 0) ? wrlen : ret;
301
static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
302
asn1_ps_func *cleanup, asn1_bio_state_t next)
305
if (ctx->ex_len <= 0)
309
ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos,
319
cleanup(b, &ctx->ex_buf, &ctx->ex_len,
329
static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
331
asn1_bio_state_t ex_state,
332
asn1_bio_state_t other_state)
334
if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg))
336
BIO_clear_retry_flags(b);
340
ctx->state = ex_state;
342
ctx->state = other_state;
346
static int asn1_bio_read(BIO *b, char *in , int inl)
350
return BIO_read(b->next_bio, in , inl);
353
static int asn1_bio_puts(BIO *b, const char *str)
355
return asn1_bio_write(b, str, strlen(str));
358
static int asn1_bio_gets(BIO *b, char *str, int size)
362
return BIO_gets(b->next_bio, str , size);
365
static long asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
367
if (b->next_bio == NULL) return(0);
368
return BIO_callback_ctrl(b->next_bio,cmd,fp);
371
static long asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
373
BIO_ASN1_BUF_CTX *ctx;
374
BIO_ASN1_EX_FUNCS *ex_func;
376
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
382
case BIO_C_SET_PREFIX:
384
ctx->prefix = ex_func->ex_func;
385
ctx->prefix_free = ex_func->ex_free_func;
388
case BIO_C_GET_PREFIX:
390
ex_func->ex_func = ctx->prefix;
391
ex_func->ex_free_func = ctx->prefix_free;
394
case BIO_C_SET_SUFFIX:
396
ctx->suffix = ex_func->ex_func;
397
ctx->suffix_free = ex_func->ex_free_func;
400
case BIO_C_GET_SUFFIX:
402
ex_func->ex_func = ctx->suffix;
403
ex_func->ex_free_func = ctx->suffix_free;
406
case BIO_C_SET_EX_ARG:
410
case BIO_C_GET_EX_ARG:
411
*(void **)arg2 = ctx->ex_arg;
418
/* Call post function if possible */
419
if (ctx->state == ASN1_STATE_HEADER)
421
if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
422
ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
426
if (ctx->state == ASN1_STATE_POST_COPY)
428
ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
434
if (ctx->state == ASN1_STATE_DONE)
435
return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
438
BIO_clear_retry_flags(b);
447
return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
454
static int asn1_bio_set_ex(BIO *b, int cmd,
455
asn1_ps_func *ex_func, asn1_ps_func *ex_free_func)
457
BIO_ASN1_EX_FUNCS extmp;
458
extmp.ex_func = ex_func;
459
extmp.ex_free_func = ex_free_func;
460
return BIO_ctrl(b, cmd, 0, &extmp);
463
static int asn1_bio_get_ex(BIO *b, int cmd,
464
asn1_ps_func **ex_func, asn1_ps_func **ex_free_func)
466
BIO_ASN1_EX_FUNCS extmp;
468
ret = BIO_ctrl(b, cmd, 0, &extmp);
471
*ex_func = extmp.ex_func;
472
*ex_free_func = extmp.ex_free_func;
477
int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, asn1_ps_func *prefix_free)
479
return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
482
int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, asn1_ps_func **pprefix_free)
484
return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
487
int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, asn1_ps_func *suffix_free)
489
return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
492
int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, asn1_ps_func **psuffix_free)
494
return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);