File: | src/lib/libcrypto/asn1/bio_ndef.c |
Warning: | line 168, column 2 Value stored to 'derlen' is never read |
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1 | /* $OpenBSD: bio_ndef.c,v 1.11 2021/12/25 13:17:48 jsing Exp $ */ |
2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
3 | * project. |
4 | */ |
5 | /* ==================================================================== |
6 | * Copyright (c) 2008 The OpenSSL Project. All rights reserved. |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without |
9 | * modification, are permitted provided that the following conditions |
10 | * are met: |
11 | * |
12 | * 1. Redistributions of source code must retain the above copyright |
13 | * notice, this list of conditions and the following disclaimer. |
14 | * |
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 |
18 | * distribution. |
19 | * |
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/)" |
24 | * |
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. |
29 | * |
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. |
33 | * |
34 | * 6. Redistributions of any form whatsoever must retain the following |
35 | * acknowledgment: |
36 | * "This product includes software developed by the OpenSSL Project |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
38 | * |
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 | * ==================================================================== |
52 | * |
53 | */ |
54 | |
55 | #include <openssl/asn1.h> |
56 | #include <openssl/asn1t.h> |
57 | #include <openssl/bio.h> |
58 | #include <openssl/err.h> |
59 | |
60 | #include <stdio.h> |
61 | |
62 | /* Experimental NDEF ASN1 BIO support routines */ |
63 | |
64 | /* The usage is quite simple, initialize an ASN1 structure, |
65 | * get a BIO from it then any data written through the BIO |
66 | * will end up translated to approptiate format on the fly. |
67 | * The data is streamed out and does *not* need to be |
68 | * all held in memory at once. |
69 | * |
70 | * When the BIO is flushed the output is finalized and any |
71 | * signatures etc written out. |
72 | * |
73 | * The BIO is a 'proper' BIO and can handle non blocking I/O |
74 | * correctly. |
75 | * |
76 | * The usage is simple. The implementation is *not*... |
77 | */ |
78 | |
79 | /* BIO support data stored in the ASN1 BIO ex_arg */ |
80 | |
81 | typedef struct ndef_aux_st { |
82 | /* ASN1 structure this BIO refers to */ |
83 | ASN1_VALUE *val; |
84 | const ASN1_ITEM *it; |
85 | /* Top of the BIO chain */ |
86 | BIO *ndef_bio; |
87 | /* Output BIO */ |
88 | BIO *out; |
89 | /* Boundary where content is inserted */ |
90 | unsigned char **boundary; |
91 | /* DER buffer start */ |
92 | unsigned char *derbuf; |
93 | } NDEF_SUPPORT; |
94 | |
95 | static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg); |
96 | static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); |
97 | static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg); |
98 | static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); |
99 | |
100 | BIO * |
101 | BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it) |
102 | { |
103 | NDEF_SUPPORT *ndef_aux = NULL((void*)0); |
104 | BIO *asn_bio = NULL((void*)0); |
105 | const ASN1_AUX *aux = it->funcs; |
106 | ASN1_STREAM_ARG sarg; |
107 | |
108 | if (!aux || !aux->asn1_cb) { |
109 | ASN1error(ASN1_R_STREAMING_NOT_SUPPORTED)ERR_put_error(13,(0xfff),(202),"/usr/src/lib/libcrypto/asn1/bio_ndef.c" ,109); |
110 | return NULL((void*)0); |
111 | } |
112 | ndef_aux = malloc(sizeof(NDEF_SUPPORT)); |
113 | asn_bio = BIO_new(BIO_f_asn1()); |
114 | |
115 | /* ASN1 bio needs to be next to output BIO */ |
116 | |
117 | out = BIO_push(asn_bio, out); |
118 | |
119 | if (!ndef_aux || !asn_bio || !out) |
120 | goto err; |
121 | |
122 | BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free); |
123 | BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free); |
124 | |
125 | /* Now let callback prepend any digest, cipher etc BIOs |
126 | * ASN1 structure needs. |
127 | */ |
128 | |
129 | sarg.out = out; |
130 | sarg.ndef_bio = NULL((void*)0); |
131 | sarg.boundary = NULL((void*)0); |
132 | |
133 | if (aux->asn1_cb(ASN1_OP_STREAM_PRE10, &val, it, &sarg) <= 0) |
134 | goto err; |
135 | |
136 | ndef_aux->val = val; |
137 | ndef_aux->it = it; |
138 | ndef_aux->ndef_bio = sarg.ndef_bio; |
139 | ndef_aux->boundary = sarg.boundary; |
140 | ndef_aux->out = out; |
141 | |
142 | BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG153, 0, ndef_aux); |
143 | |
144 | return sarg.ndef_bio; |
145 | |
146 | err: |
147 | BIO_free(asn_bio); |
148 | free(ndef_aux); |
149 | return NULL((void*)0); |
150 | } |
151 | |
152 | static int |
153 | ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg) |
154 | { |
155 | NDEF_SUPPORT *ndef_aux; |
156 | unsigned char *p; |
157 | int derlen; |
158 | |
159 | if (!parg) |
160 | return 0; |
161 | |
162 | ndef_aux = *(NDEF_SUPPORT **)parg; |
163 | |
164 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL((void*)0), ndef_aux->it); |
165 | p = malloc(derlen); |
166 | ndef_aux->derbuf = p; |
167 | *pbuf = p; |
168 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); |
Value stored to 'derlen' is never read | |
169 | |
170 | if (!*ndef_aux->boundary) |
171 | return 0; |
172 | |
173 | *plen = *ndef_aux->boundary - *pbuf; |
174 | |
175 | return 1; |
176 | } |
177 | |
178 | static int |
179 | ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) |
180 | { |
181 | NDEF_SUPPORT *ndef_aux; |
182 | |
183 | if (!parg) |
184 | return 0; |
185 | |
186 | ndef_aux = *(NDEF_SUPPORT **)parg; |
187 | |
188 | free(ndef_aux->derbuf); |
189 | |
190 | ndef_aux->derbuf = NULL((void*)0); |
191 | *pbuf = NULL((void*)0); |
192 | *plen = 0; |
193 | return 1; |
194 | } |
195 | |
196 | static int |
197 | ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) |
198 | { |
199 | NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg; |
200 | if (!ndef_prefix_free(b, pbuf, plen, parg)) |
201 | return 0; |
202 | free(*pndef_aux); |
203 | *pndef_aux = NULL((void*)0); |
204 | return 1; |
205 | } |
206 | |
207 | static int |
208 | ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg) |
209 | { |
210 | NDEF_SUPPORT *ndef_aux; |
211 | unsigned char *p; |
212 | int derlen; |
213 | const ASN1_AUX *aux; |
214 | ASN1_STREAM_ARG sarg; |
215 | |
216 | if (!parg) |
217 | return 0; |
218 | |
219 | ndef_aux = *(NDEF_SUPPORT **)parg; |
220 | |
221 | aux = ndef_aux->it->funcs; |
222 | |
223 | /* Finalize structures */ |
224 | sarg.ndef_bio = ndef_aux->ndef_bio; |
225 | sarg.out = ndef_aux->out; |
226 | sarg.boundary = ndef_aux->boundary; |
227 | if (aux->asn1_cb(ASN1_OP_STREAM_POST11, |
228 | &ndef_aux->val, ndef_aux->it, &sarg) <= 0) |
229 | return 0; |
230 | |
231 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL((void*)0), ndef_aux->it); |
232 | p = malloc(derlen); |
233 | ndef_aux->derbuf = p; |
234 | *pbuf = p; |
235 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); |
236 | |
237 | if (!*ndef_aux->boundary) |
238 | return 0; |
239 | *pbuf = *ndef_aux->boundary; |
240 | *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf); |
241 | |
242 | return 1; |
243 | } |