1 /* $OpenBSD: a_enum.c,v 1.20 2019/04/28 05:05:56 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <limits.h> 60 #include <stdio.h> 61 62 #include <openssl/asn1.h> 63 #include <openssl/bn.h> 64 #include <openssl/err.h> 65 66 /* 67 * Code for ENUMERATED type: identical to INTEGER apart from a different tag. 68 * for comments on encoding see a_int.c 69 */ 70 71 int 72 ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) 73 { 74 int j, k; 75 unsigned int i; 76 unsigned char buf[sizeof(long) + 1]; 77 long d; 78 79 a->type = V_ASN1_ENUMERATED; 80 if (a->length < (int)(sizeof(long) + 1)) { 81 free(a->data); 82 a->data = calloc(1, sizeof(long) + 1); 83 } 84 if (a->data == NULL) { 85 ASN1error(ERR_R_MALLOC_FAILURE); 86 return (0); 87 } 88 d = v; 89 if (d < 0) { 90 d = -d; 91 a->type = V_ASN1_NEG_ENUMERATED; 92 } 93 94 for (i = 0; i < sizeof(long); i++) { 95 if (d == 0) 96 break; 97 buf[i] = (int)d & 0xff; 98 d >>= 8; 99 } 100 j = 0; 101 for (k = i - 1; k >= 0; k--) 102 a->data[j++] = buf[k]; 103 a->length = j; 104 return (1); 105 } 106 107 long 108 ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a) 109 { 110 int neg = 0, i; 111 unsigned long r = 0; 112 113 if (a == NULL) 114 return (0L); 115 i = a->type; 116 if (i == V_ASN1_NEG_ENUMERATED) 117 neg = 1; 118 else if (i != V_ASN1_ENUMERATED) 119 return -1; 120 121 if (a->length > (int)sizeof(long)) { 122 /* hmm... a bit ugly */ 123 return -1; 124 } 125 if (a->data == NULL) 126 return 0; 127 128 for (i = 0; i < a->length; i++) { 129 r <<= 8; 130 r |= (unsigned char)a->data[i]; 131 } 132 133 if (r > LONG_MAX) 134 return -1; 135 136 if (neg) 137 return -(long)r; 138 return (long)r; 139 } 140 141 ASN1_ENUMERATED * 142 BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai) 143 { 144 ASN1_ENUMERATED *ret; 145 int len, j; 146 147 if (ai == NULL) 148 ret = ASN1_ENUMERATED_new(); 149 else 150 ret = ai; 151 if (ret == NULL) { 152 ASN1error(ERR_R_NESTED_ASN1_ERROR); 153 goto err; 154 } 155 if (BN_is_negative(bn)) 156 ret->type = V_ASN1_NEG_ENUMERATED; 157 else 158 ret->type = V_ASN1_ENUMERATED; 159 j = BN_num_bits(bn); 160 len = ((j == 0) ? 0 : ((j / 8) + 1)); 161 if (ret->length < len + 4) { 162 unsigned char *new_data = realloc(ret->data, len + 4); 163 if (!new_data) { 164 ASN1error(ERR_R_MALLOC_FAILURE); 165 goto err; 166 } 167 ret->data = new_data; 168 } 169 ret->length = BN_bn2bin(bn, ret->data); 170 171 /* Correct zero case */ 172 if (!ret->length) { 173 ret->data[0] = 0; 174 ret->length = 1; 175 } 176 return (ret); 177 178 err: 179 if (ret != ai) 180 ASN1_ENUMERATED_free(ret); 181 return (NULL); 182 } 183 184 BIGNUM * 185 ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn) 186 { 187 BIGNUM *ret; 188 189 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) 190 ASN1error(ASN1_R_BN_LIB); 191 else if (ai->type == V_ASN1_NEG_ENUMERATED) 192 BN_set_negative(ret, 1); 193 return (ret); 194 } 195