1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 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 (at) cryptsoft.com). 14 * 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. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 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 (at) 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 (at) cryptsoft.com)" 39 * 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 50 * SUCH DAMAGE. 51 * 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.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <limits.h> 60 #include <string.h> 61 62 #include <openssl/err.h> 63 #include <openssl/mem.h> 64 65 #include "../internal.h" 66 67 68 /* 69 * Code for ENUMERATED type: identical to INTEGER apart from a different tag. 70 * for comments on encoding see a_int.c 71 */ 72 73 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) 74 { 75 int j, k; 76 unsigned int i; 77 unsigned char buf[sizeof(long) + 1]; 78 long d; 79 80 a->type = V_ASN1_ENUMERATED; 81 if (a->length < (int)(sizeof(long) + 1)) { 82 if (a->data != NULL) 83 OPENSSL_free(a->data); 84 if ((a->data = 85 (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL) 86 OPENSSL_memset((char *)a->data, 0, sizeof(long) + 1); 87 } 88 if (a->data == NULL) { 89 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 90 return (0); 91 } 92 d = v; 93 if (d < 0) { 94 d = -d; 95 a->type = V_ASN1_NEG_ENUMERATED; 96 } 97 98 for (i = 0; i < sizeof(long); i++) { 99 if (d == 0) 100 break; 101 buf[i] = (int)d & 0xff; 102 d >>= 8; 103 } 104 j = 0; 105 for (k = i - 1; k >= 0; k--) 106 a->data[j++] = buf[k]; 107 a->length = j; 108 return (1); 109 } 110 111 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a) 112 { 113 int neg = 0, i; 114 115 if (a == NULL) 116 return (0L); 117 i = a->type; 118 if (i == V_ASN1_NEG_ENUMERATED) 119 neg = 1; 120 else if (i != V_ASN1_ENUMERATED) 121 return -1; 122 123 OPENSSL_COMPILE_ASSERT(sizeof(uint64_t) >= sizeof(long), 124 long_larger_than_uint64_t); 125 126 if (a->length > (int)sizeof(uint64_t)) { 127 /* hmm... a bit ugly */ 128 return -1; 129 } 130 131 uint64_t r64 = 0; 132 if (a->data != NULL) { 133 for (i = 0; i < a->length; i++) { 134 r64 <<= 8; 135 r64 |= (unsigned char)a->data[i]; 136 } 137 138 if (r64 > LONG_MAX) { 139 return -1; 140 } 141 } 142 143 long r = (long) r64; 144 if (neg) 145 r = -r; 146 147 return r; 148 } 149 150 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai) 151 { 152 ASN1_ENUMERATED *ret; 153 int len, j; 154 155 if (ai == NULL) 156 ret = M_ASN1_ENUMERATED_new(); 157 else 158 ret = ai; 159 if (ret == NULL) { 160 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR); 161 goto err; 162 } 163 if (BN_is_negative(bn)) 164 ret->type = V_ASN1_NEG_ENUMERATED; 165 else 166 ret->type = V_ASN1_ENUMERATED; 167 j = BN_num_bits(bn); 168 len = ((j == 0) ? 0 : ((j / 8) + 1)); 169 if (ret->length < len + 4) { 170 unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4); 171 if (!new_data) { 172 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 173 goto err; 174 } 175 ret->data = new_data; 176 } 177 178 ret->length = BN_bn2bin(bn, ret->data); 179 return (ret); 180 err: 181 if (ret != ai) 182 M_ASN1_ENUMERATED_free(ret); 183 return (NULL); 184 } 185 186 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn) 187 { 188 BIGNUM *ret; 189 190 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) 191 OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB); 192 else if (ai->type == V_ASN1_NEG_ENUMERATED) 193 BN_set_negative(ret, 1); 194 return (ret); 195 } 196
