155714Skris/* crypto/asn1/a_bitstr.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 59325337Sjkim#include <limits.h> 6055714Skris#include <stdio.h> 6155714Skris#include "cryptlib.h" 6255714Skris#include <openssl/asn1.h> 6355714Skris 6459191Skrisint ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 65280297Sjkim{ 66280297Sjkim return M_ASN1_BIT_STRING_set(x, d, len); 67280297Sjkim} 6859191Skris 6968651Skrisint i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 70280297Sjkim{ 71280297Sjkim int ret, j, bits, len; 72280297Sjkim unsigned char *p, *d; 7355714Skris 74280297Sjkim if (a == NULL) 75280297Sjkim return (0); 7655714Skris 77280297Sjkim len = a->length; 7855714Skris 79280297Sjkim if (len > 0) { 80280297Sjkim if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { 81280297Sjkim bits = (int)a->flags & 0x07; 82280297Sjkim } else { 83280297Sjkim for (; len > 0; len--) { 84280297Sjkim if (a->data[len - 1]) 85280297Sjkim break; 86280297Sjkim } 87280297Sjkim j = a->data[len - 1]; 88280297Sjkim if (j & 0x01) 89280297Sjkim bits = 0; 90280297Sjkim else if (j & 0x02) 91280297Sjkim bits = 1; 92280297Sjkim else if (j & 0x04) 93280297Sjkim bits = 2; 94280297Sjkim else if (j & 0x08) 95280297Sjkim bits = 3; 96280297Sjkim else if (j & 0x10) 97280297Sjkim bits = 4; 98280297Sjkim else if (j & 0x20) 99280297Sjkim bits = 5; 100280297Sjkim else if (j & 0x40) 101280297Sjkim bits = 6; 102280297Sjkim else if (j & 0x80) 103280297Sjkim bits = 7; 104280297Sjkim else 105280297Sjkim bits = 0; /* should not happen */ 106280297Sjkim } 107280297Sjkim } else 108280297Sjkim bits = 0; 109100936Snectar 110280297Sjkim ret = 1 + len; 111280297Sjkim if (pp == NULL) 112280297Sjkim return (ret); 113100936Snectar 114280297Sjkim p = *pp; 11555714Skris 116280297Sjkim *(p++) = (unsigned char)bits; 117280297Sjkim d = a->data; 118325335Sjkim if (len > 0) { 119325335Sjkim memcpy(p, d, len); 120325335Sjkim p += len; 121280297Sjkim p[-1] &= (0xff << bits); 122325335Sjkim } 123280297Sjkim *pp = p; 124280297Sjkim return (ret); 125280297Sjkim} 12655714Skris 127160814SsimonASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, 128280297Sjkim const unsigned char **pp, long len) 129280297Sjkim{ 130280297Sjkim ASN1_BIT_STRING *ret = NULL; 131280297Sjkim const unsigned char *p; 132280297Sjkim unsigned char *s; 133280297Sjkim int i; 13468651Skris 135280297Sjkim if (len < 1) { 136280297Sjkim i = ASN1_R_STRING_TOO_SHORT; 137280297Sjkim goto err; 138280297Sjkim } 139109998Smarkm 140325337Sjkim if (len > INT_MAX) { 141325337Sjkim i = ASN1_R_STRING_TOO_LONG; 142325337Sjkim goto err; 143325337Sjkim } 144325337Sjkim 145280297Sjkim if ((a == NULL) || ((*a) == NULL)) { 146280297Sjkim if ((ret = M_ASN1_BIT_STRING_new()) == NULL) 147280297Sjkim return (NULL); 148280297Sjkim } else 149280297Sjkim ret = (*a); 15068651Skris 151280297Sjkim p = *pp; 152280297Sjkim i = *(p++); 153280297Sjkim if (i > 7) { 154280297Sjkim i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT; 155280297Sjkim goto err; 156280297Sjkim } 157280297Sjkim /* 158280297Sjkim * We do this to preserve the settings. If we modify the settings, via 159280297Sjkim * the _set_bit function, we will recalculate on output 160280297Sjkim */ 161280297Sjkim ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ 162280297Sjkim ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */ 16355714Skris 164280297Sjkim if (len-- > 1) { /* using one because of the bits left byte */ 165280297Sjkim s = (unsigned char *)OPENSSL_malloc((int)len); 166280297Sjkim if (s == NULL) { 167280297Sjkim i = ERR_R_MALLOC_FAILURE; 168280297Sjkim goto err; 169280297Sjkim } 170280297Sjkim memcpy(s, p, (int)len); 171280297Sjkim s[len - 1] &= (0xff << i); 172280297Sjkim p += len; 173280297Sjkim } else 174280297Sjkim s = NULL; 17555714Skris 176280297Sjkim ret->length = (int)len; 177280297Sjkim if (ret->data != NULL) 178280297Sjkim OPENSSL_free(ret->data); 179280297Sjkim ret->data = s; 180280297Sjkim ret->type = V_ASN1_BIT_STRING; 181280297Sjkim if (a != NULL) 182280297Sjkim (*a) = ret; 183280297Sjkim *pp = p; 184280297Sjkim return (ret); 185280297Sjkim err: 186280297Sjkim ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i); 187280297Sjkim if ((ret != NULL) && ((a == NULL) || (*a != ret))) 188280297Sjkim M_ASN1_BIT_STRING_free(ret); 189280297Sjkim return (NULL); 190280297Sjkim} 19155714Skris 192280297Sjkim/* 193280297Sjkim * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 19455714Skris */ 19555714Skrisint ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 196280297Sjkim{ 197280297Sjkim int w, v, iv; 198280297Sjkim unsigned char *c; 19955714Skris 200280297Sjkim w = n / 8; 201280297Sjkim v = 1 << (7 - (n & 0x07)); 202280297Sjkim iv = ~v; 203280297Sjkim if (!value) 204280297Sjkim v = 0; 20555714Skris 206280297Sjkim if (a == NULL) 207280297Sjkim return 0; 208160814Ssimon 209280297Sjkim a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ 21055714Skris 211280297Sjkim if ((a->length < (w + 1)) || (a->data == NULL)) { 212280297Sjkim if (!value) 213280297Sjkim return (1); /* Don't need to set */ 214280297Sjkim if (a->data == NULL) 215280297Sjkim c = (unsigned char *)OPENSSL_malloc(w + 1); 216280297Sjkim else 217280297Sjkim c = (unsigned char *)OPENSSL_realloc_clean(a->data, 218280297Sjkim a->length, w + 1); 219280297Sjkim if (c == NULL) { 220280297Sjkim ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE); 221280297Sjkim return 0; 222280297Sjkim } 223280297Sjkim if (w + 1 - a->length > 0) 224280297Sjkim memset(c + a->length, 0, w + 1 - a->length); 225280297Sjkim a->data = c; 226280297Sjkim a->length = w + 1; 227280297Sjkim } 228280297Sjkim a->data[w] = ((a->data[w]) & iv) | v; 229280297Sjkim while ((a->length > 0) && (a->data[a->length - 1] == 0)) 230280297Sjkim a->length--; 231280297Sjkim return (1); 232280297Sjkim} 23355714Skris 23455714Skrisint ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 235280297Sjkim{ 236280297Sjkim int w, v; 23755714Skris 238280297Sjkim w = n / 8; 239280297Sjkim v = 1 << (7 - (n & 0x07)); 240280297Sjkim if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) 241280297Sjkim return (0); 242280297Sjkim return ((a->data[w] & v) != 0); 243280297Sjkim} 24455714Skris 245238405Sjkim/* 246280297Sjkim * Checks if the given bit string contains only bits specified by 247238405Sjkim * the flags vector. Returns 0 if there is at least one bit set in 'a' 248238405Sjkim * which is not specified in 'flags', 1 otherwise. 249238405Sjkim * 'len' is the length of 'flags'. 250238405Sjkim */ 251238405Sjkimint ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, 252280297Sjkim unsigned char *flags, int flags_len) 253280297Sjkim{ 254280297Sjkim int i, ok; 255280297Sjkim /* Check if there is one bit set at all. */ 256280297Sjkim if (!a || !a->data) 257280297Sjkim return 1; 258238405Sjkim 259280297Sjkim /* 260280297Sjkim * Check each byte of the internal representation of the bit string. 261280297Sjkim */ 262280297Sjkim ok = 1; 263280297Sjkim for (i = 0; i < a->length && ok; ++i) { 264280297Sjkim unsigned char mask = i < flags_len ? ~flags[i] : 0xff; 265280297Sjkim /* We are done if there is an unneeded bit set. */ 266280297Sjkim ok = (a->data[i] & mask) == 0; 267280297Sjkim } 268280297Sjkim return ok; 269280297Sjkim} 270