libsecurity_asn1/lib/SecNssCoder.cpp

   1 /*
   2  * Copyright (c) 2003-2006,2008,2010 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  *
  23  * SecNssCoder.cpp: simple C++ wrapper for PLArenaPool and the
  24  * high-level ANS1 encode/decode routines.
  25  */
  26
  27 #include <TargetConditionals.h>
  28 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
  29
  30 #include "SecNssCoder.h"
  31 #include <Security/cssmerr.h>
  32 #include <security_utilities/utilities.h>
  33 #include <security_asn1/secasn1.h>
  34 #include <string.h>
  35 #include <assert.h>
  36
  37 #ifdef  NDEBUG
  38 #define THROW_ENABLE    1
  39 #else
  40 /* disable link against Security framework when true */
  41 #define THROW_ENABLE    0
  42 #endif
  43
  44 #if             THROW_ENABLE
  45 #define THROW_ERROR     Security::CssmError::throwMe(CSSMERR_CSSM_MEMORY_ERROR)
  46 #else
  47 #define THROW_ERROR
  48 #endif
  49
  50 SecNssCoder::SecNssCoder(PRUint32 chunkSize /* = SNC_CHUNKSIZE_DEF */)
  51         : mPool(NULL)
  52 {
  53         mPool = PORT_NewArena(chunkSize);
  54         if(mPool == NULL) {
  55                 THROW_ERROR;
  56         }
  57 }
  58
  59 SecNssCoder::~SecNssCoder()
  60 {
  61         if(mPool != NULL) {
  62                 /*
  63                  * Note: we're asking for a memory zero here, but
  64                  * PORT_FreeArena doesn't do that (yet).
  65                  */
  66                 PORT_FreeArena(mPool, PR_TRUE);
  67                 mPool = NULL;
  68         }
  69 }
  70
  71 PRErrorCode     SecNssCoder::decode(
  72         const void                              *src,           // BER-encoded source
  73         size_t                          len,
  74         const SecAsn1Template   *templ,
  75         void                                    *dest)
  76 {
  77         SECStatus prtn;
  78
  79         assert(mPool != NULL);
  80         prtn = SEC_ASN1Decode(mPool, dest, templ, (const char *)src, len);
  81         if(prtn) {
  82                 return PR_GetError();
  83         }
  84         else {
  85                 return 0;
  86         }
  87 }
  88
  89 PRErrorCode SecNssCoder::encodeItem(
  90         const void                              *src,
  91         const SecAsn1Template   *templ,
  92         SECItem                                 &dest)
  93 {
  94         assert(mPool != NULL);
  95
  96         dest.Data = NULL;
  97         dest.Length = 0;
  98
  99         SECItem *rtnItem = SEC_ASN1EncodeItem(mPool, &dest, src, templ);
 100         if(rtnItem == NULL) {
 101                 return PR_GetError();
 102         }
 103         else {
 104                 return 0;
 105         }
 106 }
 107
 108 void *SecNssCoder::malloc(size_t len)
 109 {
 110         assert(mPool != NULL);
 111         void *rtn = PORT_ArenaAlloc(mPool, len);
 112         if(rtn == NULL) {
 113                 THROW_ERROR;
 114         }
 115         return rtn;
 116 }
 117
 118 /* malloc item.Data, set item.Length */
 119 void SecNssCoder::allocItem(
 120         SECItem                                 &item,
 121         size_t                                  len)
 122 {
 123         item.Data = (uint8 *)malloc(len);
 124         item.Length = len;
 125 }
 126
 127 /* malloc and copy */
 128 void SecNssCoder::allocCopyItem(
 129         const void                              *src,
 130         size_t                                  len,
 131         SECItem                                 &dest)
 132 {
 133         allocItem(dest, len);
 134         memmove(dest.Data, src, len);
 135 }
 136
 137 /*
 138  * This is pretty much a copy of SEC_ASN1EncodeItem, with a Allocator
 139  * malloc replacing the sec_asn1e_allocate_item to alloc the output data.
 140  */
 141 PRErrorCode SecNssEncodeItem(
 142         const void                              *src,
 143         const SecAsn1Template   *templ,
 144         Security::Allocator     &alloc,
 145         SECItem                                 &dest)
 146 {
 147     unsigned long encoding_length = 0;
 148     SECStatus rv;
 149
 150         dest.Data = NULL;
 151         dest.Length = 0;
 152
 153     rv = SEC_ASN1Encode (src, templ,
 154                          sec_asn1e_encode_item_count, &encoding_length);
 155     if (rv != SECSuccess) {
 156                 return PR_GetError();
 157         }
 158
 159         /* replace this...
 160     dest = sec_asn1e_allocate_item (poolp, dest, encoding_length);
 161     if (dest == NULL)
 162         return NULL;
 163         ... with this: */
 164         dest.Data = (uint8 *)alloc.malloc(encoding_length);
 165         dest.Length = 0;
 166         /* end replacement */
 167
 168     rv = SEC_ASN1Encode (src, templ, sec_asn1e_encode_item_store, &dest);
 169     if (rv != SECSuccess) {
 170                 return PR_GetError();
 171         }
 172
 173     assert(encoding_length == dest.Length);
 174     return 0;
 175 }
 176
 177 PRErrorCode SecNssEncodeItemOdata(
 178         const void                              *src,
 179         const SecAsn1Template   *templ,
 180         CssmOwnedData                   &odata)
 181 {
 182         Allocator &alloc = odata.allocator;
 183         SECItem sitem;
 184         PRErrorCode prtn;
 185
 186         prtn = SecNssEncodeItem(src, templ, alloc, sitem);
 187         if(prtn) {
 188                 return prtn;
 189         }
 190         odata.set(sitem.Data, sitem.Length);
 191         return 0;
 192 }
 193
 194 #endif /* TARGET_OS_MAC */