1 /* asn_pack.c */ 2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3 * project 1999. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/asn1.h> 62 63 /* ASN1 packing and unpacking functions */ 64 65 /* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */ 66 67 STACK *ASN1_seq_unpack(unsigned char *buf, int len, char *(*d2i)(), 68 void (*free_func)()) 69 { 70 STACK *sk; 71 unsigned char *pbuf; 72 pbuf = buf; 73 if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func, 74 V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL))) 75 ASN1err(ASN1_F_ASN1_SEQ_UNPACK,ASN1_R_DECODE_ERROR); 76 return sk; 77 } 78 79 /* Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a 80 * Malloc'ed buffer 81 */ 82 83 unsigned char *ASN1_seq_pack(STACK *safes, int (*i2d)(), unsigned char **buf, 84 int *len) 85 { 86 int safelen; 87 unsigned char *safe, *p; 88 if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE, 89 V_ASN1_UNIVERSAL, IS_SEQUENCE))) { 90 ASN1err(ASN1_F_ASN1_SEQ_PACK,ASN1_R_ENCODE_ERROR); 91 return NULL; 92 } 93 if (!(safe = Malloc (safelen))) { 94 ASN1err(ASN1_F_ASN1_SEQ_PACK,ERR_R_MALLOC_FAILURE); 95 return NULL; 96 } 97 p = safe; 98 i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL, 99 IS_SEQUENCE); 100 if (len) *len = safelen; 101 if (buf) *buf = safe; 102 return safe; 103 } 104 105 /* Extract an ASN1 object from an ASN1_STRING */ 106 107 void *ASN1_unpack_string (ASN1_STRING *oct, char *(*d2i)()) 108 { 109 unsigned char *p; 110 char *ret; 111 112 p = oct->data; 113 if(!(ret = d2i(NULL, &p, oct->length))) 114 ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR); 115 return ret; 116 } 117 118 /* Pack an ASN1 object into an ASN1_STRING */ 119 120 ASN1_STRING *ASN1_pack_string (void *obj, int (*i2d)(), ASN1_STRING **oct) 121 { 122 unsigned char *p; 123 ASN1_STRING *octmp; 124 125 if (!oct || !*oct) { 126 if (!(octmp = ASN1_STRING_new ())) { 127 ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE); 128 return NULL; 129 } 130 if (oct) *oct = octmp; 131 } else octmp = *oct; 132 133 if (!(octmp->length = i2d(obj, NULL))) { 134 ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR); 135 return NULL; 136 } 137 if (!(p = Malloc (octmp->length))) { 138 ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE); 139 return NULL; 140 } 141 octmp->data = p; 142 i2d (obj, &p); 143 return octmp; 144 } 145 146