1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
57 #include <openssl/asn1.h>
59 #include <openssl/err.h>
60 #include <openssl/mem.h>
62 int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
63 { return M_ASN1_BIT_STRING_set(x, d, len); }
65 int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
70 if (a == NULL) return(0);
76 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
78 bits=(int)a->flags&0x07;
82 for ( ; len > 0; len--)
84 if (a->data[len-1]) break;
88 else if (j & 0x02) bits=1;
89 else if (j & 0x04) bits=2;
90 else if (j & 0x08) bits=3;
91 else if (j & 0x10) bits=4;
92 else if (j & 0x20) bits=5;
93 else if (j & 0x40) bits=6;
94 else if (j & 0x80) bits=7;
95 else bits=0; /* should not happen */
102 if (pp == NULL) return(ret);
106 *(p++)=(unsigned char)bits;
110 if (len > 0) p[-1]&=(0xff<<bits);
115 ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
116 const unsigned char **pp, long len)
118 ASN1_BIT_STRING *ret=NULL;
119 const unsigned char *p;
125 i=ASN1_R_STRING_TOO_SHORT;
129 if ((a == NULL) || ((*a) == NULL))
131 if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
138 /* We do this to preserve the settings. If we modify
139 * the settings, via the _set_bit function, we will recalculate
141 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
142 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
144 if (len-- > 1) /* using one because of the bits left byte */
146 s=(unsigned char *)OPENSSL_malloc((int)len);
149 i=ERR_R_MALLOC_FAILURE;
152 memcpy(s,p,(int)len);
159 ret->length=(int)len;
160 if (ret->data != NULL) OPENSSL_free(ret->data);
162 ret->type=V_ASN1_BIT_STRING;
163 if (a != NULL) (*a)=ret;
167 OPENSSL_PUT_ERROR(ASN1, c2i_ASN1_BIT_STRING, i);
168 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
169 M_ASN1_BIT_STRING_free(ret);
173 /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
175 int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
188 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
190 if ((a->length < (w+1)) || (a->data == NULL))
192 if (!value) return(1); /* Don't need to set */
194 c=(unsigned char *)OPENSSL_malloc(w+1);
196 c=(unsigned char *)OPENSSL_realloc_clean(a->data,
201 OPENSSL_PUT_ERROR(ASN1, ASN1_BIT_STRING_set_bit, ERR_R_MALLOC_FAILURE);
204 if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length);
208 a->data[w]=((a->data[w])&iv)|v;
209 while ((a->length > 0) && (a->data[a->length-1] == 0))
214 int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
220 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
222 return((a->data[w]&v) != 0);
226 * Checks if the given bit string contains only bits specified by
227 * the flags vector. Returns 0 if there is at least one bit set in 'a'
228 * which is not specified in 'flags', 1 otherwise.
229 * 'len' is the length of 'flags'.
231 int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
232 unsigned char *flags, int flags_len)
235 /* Check if there is one bit set at all. */
236 if (!a || !a->data) return 1;
238 /* Check each byte of the internal representation of the bit string. */
240 for (i = 0; i < a->length && ok; ++i)
242 unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
243 /* We are done if there is an unneeded bit set. */
244 ok = (a->data[i] & mask) == 0;