libsecurity_smime/lib/secalgid.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 #include "secoid.h"
  35 #include "SecAsn1Item.h"
  36 #include <security_asn1/secasn1.h>
  37 #include <security_asn1/secerr.h>
  38 #include <security_asn1/secport.h>
  39
  40 const SecAsn1Template SECOID_AlgorithmIDTemplate[] = {
  41     { SEC_ASN1_SEQUENCE,
  42           0, NULL, sizeof(SECAlgorithmID) },
  43     { SEC_ASN1_OBJECT_ID,
  44           offsetof(SECAlgorithmID,algorithm), },
  45     { SEC_ASN1_OPTIONAL | SEC_ASN1_ANY,
  46           offsetof(SECAlgorithmID,parameters), },
  47     { 0 }
  48 };
  49
  50 SECOidTag
  51 SECOID_GetAlgorithmTag(const SECAlgorithmID *id)
  52 {
  53     if (id == NULL || id->algorithm.Data == NULL)
  54                 return SEC_OID_UNKNOWN;
  55
  56     return SECOID_FindOIDTag (&(id->algorithm));
  57 }
  58
  59 SECStatus
  60 SECOID_SetAlgorithmID(PRArenaPool *arena, SECAlgorithmID *id, SECOidTag which,
  61                       const SecAsn1Item *params)
  62 {
  63     SECOidData *oiddata;
  64     Boolean add_null_param;
  65
  66     oiddata = SECOID_FindOIDByTag(which);
  67     if ( !oiddata )
  68         {
  69                 PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
  70                 return SECFailure;
  71     }
  72
  73     if (SECITEM_CopyItem(arena, &id->algorithm, &oiddata->oid))
  74                 return SECFailure;
  75
  76     switch (which)
  77         {
  78         case SEC_OID_MD2:
  79         case SEC_OID_MD4:
  80         case SEC_OID_MD5:
  81         case SEC_OID_SHA1:
  82         case SEC_OID_SHA256:
  83         case SEC_OID_SHA384:
  84         case SEC_OID_SHA512:
  85         case SEC_OID_PKCS1_RSA_ENCRYPTION:
  86         case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION:
  87         case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION:
  88         case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION:
  89         case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION:
  90         case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION:
  91         case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION:
  92         case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION:
  93                 add_null_param = PR_TRUE;
  94                 break;
  95         default:
  96                 add_null_param = PR_FALSE;
  97                 break;
  98     }
  99
 100     if (params) {
 101                 /*
 102                 * I am specifically *not* enforcing the following assertion
 103                 * (by following it up with an error and a return of failure)
 104                 * because I do not want to introduce any change in the current
 105                 * behavior.  But I do want for us to notice if the following is
 106                 * ever true, because I do not think it should be so and probably
 107                 * signifies an error/bug somewhere.
 108                 */
 109                 PORT_Assert(!add_null_param || (params->Length == 2
 110                                         && params->Data[0] == SEC_ASN1_NULL
 111                                         && params->Data[1] == 0));
 112                 if (SECITEM_CopyItem(arena, &id->parameters, params)) {
 113                         return SECFailure;
 114                 }
 115     } else {
 116                 /*
 117                 * Again, this is not considered an error.  But if we assume
 118                 * that nobody tries to set the parameters field themselves
 119                 * (but always uses this routine to do that), then we should
 120                 * not hit the following assertion.  Unless they forgot to zero
 121                 * the structure, which could also be a bad (and wrong) thing.
 122                 */
 123                 PORT_Assert(id->parameters.Data == NULL);
 124
 125                 if (add_null_param) {
 126                         (void) SECITEM_AllocItem(arena, &id->parameters, 2);
 127                         if (id->parameters.Data == NULL) {
 128                                 return SECFailure;
 129                         }
 130                         id->parameters.Data[0] = SEC_ASN1_NULL;
 131                         id->parameters.Data[1] = 0;
 132                 }
 133     }
 134
 135     return SECSuccess;
 136 }
 137
 138 SECStatus
 139 SECOID_CopyAlgorithmID(PRArenaPool *arena, SECAlgorithmID *to, const SECAlgorithmID *from)
 140 {
 141     SECStatus rv;
 142
 143     rv = SECITEM_CopyItem(arena, &to->algorithm, &from->algorithm);
 144     if (rv) return rv;
 145         rv = SECITEM_CopyItem(arena, &to->parameters, &from->parameters);
 146     return rv;
 147 }
 148
 149 void SECOID_DestroyAlgorithmID(SECAlgorithmID *algid, Boolean freeit)
 150 {
 151     SECITEM_FreeItem(&algid->parameters, PR_FALSE);
 152     SECITEM_FreeItem(&algid->algorithm, PR_FALSE);
 153     if(freeit == PR_TRUE)
 154                 PORT_Free(algid);
 155 }
 156
 157 SECComparison
 158 SECOID_CompareAlgorithmID(const SECAlgorithmID *a, const SECAlgorithmID *b)
 159 {
 160     SECComparison rv;
 161
 162     rv = SECITEM_CompareItem(&a->algorithm, &b->algorithm);
 163     if (rv) return rv;
 164     rv = SECITEM_CompareItem(&a->parameters, &b->parameters);
 165     return rv;
 166 }
 167
 168 /* This functions simply returns the address of the above-declared template. */
 169 SEC_ASN1_CHOOSER_IMPLEMENT(SECOID_AlgorithmIDTemplate)
 170