OSX/libsecurity_smime/lib/cmsdigdata.c

   1 /*
   2  * The contents of this file are subject to the Mozilla Public
   3  * License Version 1.1 (the "License"); you may not use this file
   4  * except in compliance with the License. You may obtain a copy of
   5  * the License at http://www.mozilla.org/MPL/
   6  *
   7  * Software distributed under the License is distributed on an "AS
   8  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
   9  * implied. See the License for the specific language governing
  10  * rights and limitations under the License.
  11  *
  12  * The Original Code is the Netscape security libraries.
  13  *
  14  * The Initial Developer of the Original Code is Netscape
  15  * Communications Corporation.  Portions created by Netscape are
  16  * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
  17  * Rights Reserved.
  18  *
  19  * Contributor(s):
  20  *
  21  * Alternatively, the contents of this file may be used under the
  22  * terms of the GNU General Public License Version 2 or later (the
  23  * "GPL"), in which case the provisions of the GPL are applicable
  24  * instead of those above.  If you wish to allow use of your
  25  * version of this file only under the terms of the GPL and not to
  26  * allow others to use your version of this file under the MPL,
  27  * indicate your decision by deleting the provisions above and
  28  * replace them with the notice and other provisions required by
  29  * the GPL.  If you do not delete the provisions above, a recipient
  30  * may use your version of this file under either the MPL or the
  31  * GPL.
  32  */
  33
  34 /*
  35  * CMS digestedData methods.
  36  */
  37
  38 #include <Security/SecCmsDigestedData.h>
  39
  40 #include <Security/SecCmsContentInfo.h>
  41 #include <Security/SecCmsDigestContext.h>
  42
  43 #include "cmslocal.h"
  44
  45 #include "secitem.h"
  46 #include "secoid.h"
  47 #include <security_asn1/secasn1.h>
  48 #include <security_asn1/secerr.h>
  49
  50 /*
  51  * SecCmsDigestedDataCreate - create a digestedData object (presumably for encoding)
  52  *
  53  * version will be set by SecCmsDigestedDataEncodeBeforeStart
  54  * digestAlg is passed as parameter
  55  * contentInfo must be filled by the user
  56  * digest will be calculated while encoding
  57  */
  58 SecCmsDigestedDataRef
  59 SecCmsDigestedDataCreate(SecCmsMessageRef cmsg, SECAlgorithmID *digestalg)
  60 {
  61     void *mark;
  62     SecCmsDigestedDataRef digd;
  63     PLArenaPool *poolp;
  64
  65     poolp = cmsg->poolp;
  66
  67     mark = PORT_ArenaMark(poolp);
  68
  69     digd = (SecCmsDigestedDataRef)PORT_ArenaZAlloc(poolp, sizeof(SecCmsDigestedData));
  70     if (digd == NULL)
  71         goto loser;
  72
  73     digd->cmsg = cmsg;
  74
  75     if (SECOID_CopyAlgorithmID (poolp, &(digd->digestAlg), digestalg) != SECSuccess)
  76         goto loser;
  77
  78     PORT_ArenaUnmark(poolp, mark);
  79     return digd;
  80
  81 loser:
  82     PORT_ArenaRelease(poolp, mark);
  83     return NULL;
  84 }
  85
  86 /*
  87  * SecCmsDigestedDataDestroy - destroy a digestedData object
  88  */
  89 void
  90 SecCmsDigestedDataDestroy(SecCmsDigestedDataRef digd)
  91 {
  92     /* everything's in a pool, so don't worry about the storage */
  93     SecCmsContentInfoDestroy(&(digd->contentInfo));
  94     return;
  95 }
  96
  97 /*
  98  * SecCmsDigestedDataGetContentInfo - return pointer to digestedData object's contentInfo
  99  */
 100 SecCmsContentInfoRef
 101 SecCmsDigestedDataGetContentInfo(SecCmsDigestedDataRef digd)
 102 {
 103     return &(digd->contentInfo);
 104 }
 105
 106 /*
 107  * SecCmsDigestedDataEncodeBeforeStart - do all the necessary things to a DigestedData
 108  *     before encoding begins.
 109  *
 110  * In particular:
 111  *  - set the right version number. The contentInfo's content type must be set up already.
 112  */
 113 OSStatus
 114 SecCmsDigestedDataEncodeBeforeStart(SecCmsDigestedDataRef digd)
 115 {
 116     unsigned long version;
 117     CSSM_DATA_PTR dummy;
 118
 119     version = SEC_CMS_DIGESTED_DATA_VERSION_DATA;
 120     if (SecCmsContentInfoGetContentTypeTag(&(digd->contentInfo)) != SEC_OID_PKCS7_DATA)
 121         version = SEC_CMS_DIGESTED_DATA_VERSION_ENCAP;
 122
 123     dummy = SEC_ASN1EncodeInteger(digd->cmsg->poolp, &(digd->version), version);
 124     return (dummy == NULL) ? SECFailure : SECSuccess;
 125 }
 126
 127 /*
 128  * SecCmsDigestedDataEncodeBeforeData - do all the necessary things to a DigestedData
 129  *     before the encapsulated data is passed through the encoder.
 130  *
 131  * In detail:
 132  *  - set up the digests if necessary
 133  */
 134 OSStatus
 135 SecCmsDigestedDataEncodeBeforeData(SecCmsDigestedDataRef digd)
 136 {
 137     /* set up the digests */
 138     if (digd->digestAlg.algorithm.Length != 0 && digd->digest.Length == 0) {
 139         /* if digest is already there, do nothing */
 140         digd->contentInfo.digcx = SecCmsDigestContextStartSingle(&(digd->digestAlg));
 141         if (digd->contentInfo.digcx == NULL)
 142             return SECFailure;
 143     }
 144     return SECSuccess;
 145 }
 146
 147 /*
 148  * SecCmsDigestedDataEncodeAfterData - do all the necessary things to a DigestedData
 149  *     after all the encapsulated data was passed through the encoder.
 150  *
 151  * In detail:
 152  *  - finish the digests
 153  */
 154 OSStatus
 155 SecCmsDigestedDataEncodeAfterData(SecCmsDigestedDataRef digd)
 156 {
 157     OSStatus rv = SECSuccess;
 158     /* did we have digest calculation going on? */
 159     if (digd->contentInfo.digcx) {
 160         rv = SecCmsDigestContextFinishSingle(digd->contentInfo.digcx,
 161                                              (SecArenaPoolRef)digd->cmsg->poolp, &(digd->digest));
 162         /* error has been set by SecCmsDigestContextFinishSingle */
 163         digd->contentInfo.digcx = NULL;
 164     }
 165
 166     return rv;
 167 }
 168
 169 /*
 170  * SecCmsDigestedDataDecodeBeforeData - do all the necessary things to a DigestedData
 171  *     before the encapsulated data is passed through the encoder.
 172  *
 173  * In detail:
 174  *  - set up the digests if necessary
 175  */
 176 OSStatus
 177 SecCmsDigestedDataDecodeBeforeData(SecCmsDigestedDataRef digd)
 178 {
 179     /* is there a digest algorithm yet? */
 180     if (digd->digestAlg.algorithm.Length == 0)
 181         return SECFailure;
 182
 183     digd->contentInfo.digcx = SecCmsDigestContextStartSingle(&(digd->digestAlg));
 184     if (digd->contentInfo.digcx == NULL)
 185         return SECFailure;
 186
 187     return SECSuccess;
 188 }
 189
 190 /*
 191  * SecCmsDigestedDataDecodeAfterData - do all the necessary things to a DigestedData
 192  *     after all the encapsulated data was passed through the encoder.
 193  *
 194  * In detail:
 195  *  - finish the digests
 196  */
 197 OSStatus
 198 SecCmsDigestedDataDecodeAfterData(SecCmsDigestedDataRef digd)
 199 {
 200     OSStatus rv = SECSuccess;
 201     /* did we have digest calculation going on? */
 202     if (digd->contentInfo.digcx) {
 203         rv = SecCmsDigestContextFinishSingle(digd->contentInfo.digcx,
 204                                              (SecArenaPoolRef)digd->cmsg->poolp, &(digd->cdigest));
 205         /* error has been set by SecCmsDigestContextFinishSingle */
 206         digd->contentInfo.digcx = NULL;
 207     }
 208
 209     return rv;
 210 }
 211
 212 /*
 213  * SecCmsDigestedDataDecodeAfterEnd - finalize a digestedData.
 214  *
 215  * In detail:
 216  *  - check the digests for equality
 217  */
 218 OSStatus
 219 SecCmsDigestedDataDecodeAfterEnd(SecCmsDigestedDataRef digd)
 220 {
 221     /* did we have digest calculation going on? */
 222     if (digd->cdigest.Length != 0) {
 223         /* XXX comparision btw digest & cdigest */
 224         /* XXX set status */
 225         /* TODO!!!! */
 226     }
 227
 228     return SECSuccess;
 229 }