Add PK11_ExportDERPrivateKeyInfo and PK11_ExportPrivKeyInfo.

nss/lib/pk11wrap/pk11obj.c

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * This file manages object type indepentent functions.
  */
 #include "seccomon.h"
 #include "secmod.h"
 #include "secmodi.h"
 #include "secmodti.h"
@@ skipping 63 matching lines @@
         PORT_SetError(PK11_MapError(crv));
     }
     PK11_RestoreROSession(slot,rwsession);
     return rv;
 }
 
 /*
  * Read in a single attribute into a SECItem. Allocate space for it with 
  * PORT_Alloc unless an arena is supplied. In the latter case use the arena
  * to allocate the space.
+ *
+ * PK11_ReadAttribute sets the 'data' and 'len' fields of the SECItem but
+ * does not modify its 'type' field.
  */
 SECStatus
 PK11_ReadAttribute(PK11SlotInfo *slot, CK_OBJECT_HANDLE id,
          CK_ATTRIBUTE_TYPE type, PLArenaPool *arena, SECItem *result) {
     CK_ATTRIBUTE attr = { 0, NULL, 0 };
     CK_RV crv;
 
     attr.type = type;
 
     PK11_EnterSlotMonitor(slot);
@@ skipping 1875 matching lines @@
         PORT_SetError( PK11_MapError(crv) );
         return NULL;
     }
 
     item->data = (unsigned char*) theTemplate[0].pValue;
     item->len =theTemplate[0].ulValueLen;
 
     return item;
 }