1 /* crypto/asn1/a_enum.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/asn1.h> 62 #include <openssl/bn.h> 63 64 /* 65 * Code for ENUMERATED type: identical to INTEGER apart from a different tag. 66 * for comments on encoding see a_int.c 67 */ 68 69 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) 70 { 71 int j,k; 72 unsigned int i; 73 unsigned char buf[sizeof(long)+1]; 74 long d; 75 76 a->type=V_ASN1_ENUMERATED; 77 if (a->length < (int)(sizeof(long)+1)) 78 { 79 if (a->data != NULL) 80 OPENSSL_free(a->data); 81 if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL) 82 memset((char *)a->data,0,sizeof(long)+1); 83 } 84 if (a->data == NULL) 85 { 86 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE); 87 return(0); 88 } 89 d=v; 90 if (d < 0) 91 { 92 d= -d; 93 a->type=V_ASN1_NEG_ENUMERATED; 94 } 95 96 for (i=0; i<sizeof(long); i++) 97 { 98 if (d == 0) break; 99 buf[i]=(int)d&0xff; 100 d>>=8; 101 } 102 j=0; 103 for (k=i-1; k >=0; k--) 104 a->data[j++]=buf[k]; 105 a->length=j; 106 return(1); 107 } 108 109 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a) 110 { 111 int neg=0,i; 112 long r=0; 113 114 if (a == NULL) 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 { 123 /* hmm... a bit ugly */ 124 return(0xffffffffL); 125 } 126 if (a->data == NULL) 127 return 0; 128 129 for (i=0; i<a->length; i++) 130 { 131 r<<=8; 132 r|=(unsigned char)a->data[i]; 133 } 134 if (neg) r= -r; 135 return(r); 136 } 137 138 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai) 139 { 140 ASN1_ENUMERATED *ret; 141 int len,j; 142 143 if (ai == NULL) 144 ret=M_ASN1_ENUMERATED_new(); 145 else 146 ret=ai; 147 if (ret == NULL) 148 { 149 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR); 150 goto err; 151 } 152 if(BN_is_negative(bn)) ret->type = V_ASN1_NEG_ENUMERATED; 153 else ret->type=V_ASN1_ENUMERATED; 154 j=BN_num_bits(bn); 155 len=((j == 0)?0:((j/8)+1)); 156 if (ret->length < len+4) 157 { 158 unsigned char *new_data=OPENSSL_realloc(ret->data, len+4); 159 if (!new_data) 160 { 161 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE); 162 goto err; 163 } 164 ret->data=new_data; 165 } 166 167 ret->length=BN_bn2bin(bn,ret->data); 168 return(ret); 169 err: 170 if (ret != ai) M_ASN1_ENUMERATED_free(ret); 171 return(NULL); 172 } 173 174 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn) 175 { 176 BIGNUM *ret; 177 178 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL) 179 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB); 180 else if(ai->type == V_ASN1_NEG_ENUMERATED) BN_set_negative(ret,1); 181 return(ret); 182 } 183
