OSX/libsecurity_apple_csp/lib/AppleCSPKeys.cpp

   1 /*
   2  * Copyright (c) 2003,2011-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please
   7  * obtain a copy of the License at http://www.apple.com/publicsource and
   8  * read it before using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  12  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  13  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  15  * Please see the License for the specific language governing rights and
  16  * limitations under the License.
  17  */
  18 /*
  19  * AppleCSPKeys.cpp - Key support
  20  */
  21
  22 #include "AppleCSPKeys.h"
  23 #include "AppleCSPUtils.h"
  24 /*
  25  * CSPKeyInfoProvider for symmetric keys.
  26  */
  27 CSPKeyInfoProvider *SymmetricKeyInfoProvider::provider(
  28                 const CssmKey   &cssmKey,
  29                 AppleCSPSession &session)
  30 {
  31         if(cssmKey.blobType() != CSSM_KEYBLOB_RAW) {
  32                 errorLog0("KeyInfoProvider deals only with RAW keys!\n");
  33                 CssmError::throwMe(CSSMERR_CSP_INTERNAL_ERROR);
  34         }
  35         if(cssmKey.keyClass() != CSSM_KEYCLASS_SESSION_KEY) {
  36                 /* that's all we need to know */
  37                 return NULL;
  38         }
  39         return new SymmetricKeyInfoProvider(cssmKey, session);
  40 }
  41
  42 SymmetricKeyInfoProvider::SymmetricKeyInfoProvider(
  43         const CssmKey   &cssmKey,
  44         AppleCSPSession &session) :
  45                 CSPKeyInfoProvider(cssmKey, session)
  46 {
  47 }
  48
  49 /* cook up a Binary key */
  50 void SymmetricKeyInfoProvider::CssmKeyToBinary(
  51         CssmKey                         *paramKey,      // ignored
  52         CSSM_KEYATTR_FLAGS      &attrFlags,     // IN/OUT
  53         BinaryKey                       **binKey)
  54 {
  55         CASSERT(mKey.keyClass() == CSSM_KEYCLASS_SESSION_KEY);
  56         SymmetricBinaryKey *symBinKey = new SymmetricBinaryKey(
  57                 mKey.KeyHeader.LogicalKeySizeInBits);
  58         copyCssmData(mKey,
  59                 symBinKey->mKeyData,
  60                 symBinKey->mAllocator);
  61         *binKey = symBinKey;
  62 }
  63
  64 /* obtain key size in bits */
  65 void SymmetricKeyInfoProvider::QueryKeySizeInBits(
  66         CSSM_KEY_SIZE &keySize)
  67 {
  68         /* FIXME - do we ever need to calculate RC2 effective size here? */
  69         keySize.LogicalKeySizeInBits = keySize.EffectiveKeySizeInBits =
  70                 (uint32)(mKey.length() * 8);
  71 }
  72
  73 /*
  74  * Obtain blob suitable for hashing in CSSM_APPLECSP_KEYDIGEST
  75  * passthrough.
  76  */
  77 bool SymmetricKeyInfoProvider::getHashableBlob(
  78         Allocator       &allocator,
  79         CssmData                &blob)                  // blob to hash goes here
  80 {
  81         /*
  82          * This is trivial: the raw key is already in the "proper" format.
  83          */
  84         assert(mKey.blobType() == CSSM_KEYBLOB_RAW);
  85         const CssmData &keyBlob = CssmData::overlay(mKey.KeyData);
  86         copyCssmData(keyBlob, blob, allocator);
  87         return true;
  88 }
  89