OSX/libsecurity_apple_csp/lib/desContext.cpp

   1 /*
   2  * Copyright (c) 2000-2001,2011,2014 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 obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * 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 EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20  * desContext.cpp - glue between BlockCrytpor and DES implementation
  21  */
  22
  23 #include "desContext.h"
  24 #include <security_utilities/debugging.h>
  25 #include <security_utilities/globalizer.h>
  26 #include <security_utilities/threading.h>
  27
  28 #define DESDebug(args...)       secdebug("desContext", ## args)
  29
  30 /*
  31  * DES encrypt/decrypt.
  32  */
  33 DESContext::DESContext(AppleCSPSession &session) : BlockCryptor(session), DesInst(NULL)
  34 {
  35 }
  36
  37 DESContext::~DESContext()
  38 {
  39     if (DesInst != NULL) {
  40         CCCryptorRelease(DesInst);
  41     }
  42
  43     DesInst = NULL;
  44 }
  45
  46 /*
  47  * Standard CSPContext init, called from CSPFullPluginSession::init().
  48  * Reusable, e.g., query followed by en/decrypt.
  49  */
  50 void DESContext::init(
  51         const Context &context,
  52         bool encrypting)
  53 {
  54         CSSM_SIZE       keyLen;
  55         uint8           *keyData        = NULL;
  56
  57         /* obtain key from context */
  58         symmetricKeyBits(context, session(), CSSM_ALGID_DES,
  59                 encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
  60                 keyData, keyLen);
  61         if(keyLen != (DES_KEY_SIZE_BITS_EXTERNAL / 8)) {
  62                 CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
  63         }
  64
  65     if (DesInst != NULL)
  66     {
  67         CCCryptorRelease(DesInst);
  68     }
  69
  70     (void) CCCryptorCreateWithMode(0, kCCModeECB, kCCAlgorithmDES, ccDefaultPadding, NULL, keyData, kCCKeySizeDES, NULL, 0, 0, 0, &DesInst);
  71
  72         /* Finally, have BlockCryptor do its setup */
  73         setup(DES_BLOCK_SIZE_BYTES, context);
  74 }
  75
  76 /*
  77  * Functions called by BlockCryptor
  78  * DES does encrypt/decrypt in place
  79  */
  80 void DESContext::encryptBlock(
  81         const void              *plainText,                     // length implied (one block)
  82         size_t                  plainTextLen,
  83         void                    *cipherText,
  84         size_t                  &cipherTextLen,         // in/out, throws on overflow
  85         bool                    final)                          // ignored
  86 {
  87         if(plainTextLen != DES_BLOCK_SIZE_BYTES) {
  88                 CssmError::throwMe(CSSMERR_CSP_INPUT_LENGTH_ERROR);
  89         }
  90         if(cipherTextLen < DES_BLOCK_SIZE_BYTES) {
  91                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
  92         }
  93     (void) CCCryptorEncryptDataBlock(DesInst, NULL, plainText, DES_BLOCK_SIZE_BYTES, cipherText);
  94         cipherTextLen = DES_BLOCK_SIZE_BYTES;
  95 }
  96
  97 void DESContext::decryptBlock(
  98         const void              *cipherText,            // length implied (one block)
  99         size_t                  cipherTextLen,
 100         void                    *plainText,
 101         size_t                  &plainTextLen,          // in/out, throws on overflow
 102         bool                    final)                          // ignored
 103 {
 104         if(plainTextLen < DES_BLOCK_SIZE_BYTES) {
 105                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
 106         }
 107         if(plainText != cipherText) {
 108                 /* little optimization for callers who want to decrypt in place */
 109                 memmove(plainText, cipherText, DES_BLOCK_SIZE_BYTES);
 110         }
 111     (void) CCCryptorDecryptDataBlock(DesInst, NULL, cipherText, DES_BLOCK_SIZE_BYTES, plainText);
 112         plainTextLen = DES_BLOCK_SIZE_BYTES;
 113 }
 114
 115 /***
 116  *** Triple-DES - EDE, 24-bit key only
 117  ***/
 118
 119 DES3Context::DES3Context(AppleCSPSession &session) : BlockCryptor(session), DesInst(NULL)
 120 {
 121 }
 122
 123
 124
 125 DES3Context::~DES3Context()
 126 {
 127     if (DesInst != NULL) {
 128         CCCryptorRelease(DesInst);
 129     }
 130
 131     DesInst = NULL;
 132 }
 133
 134 /*
 135  * Standard CSPContext init, called from CSPFullPluginSession::init().
 136  * Reusable, e.g., query followed by en/decrypt.
 137  */
 138 void DES3Context::init(
 139         const Context &context,
 140         bool encrypting)
 141 {
 142         CSSM_SIZE       keyLen;
 143         uint8           *keyData        = NULL;
 144
 145         /* obtain key from context */
 146         symmetricKeyBits(context, session(), CSSM_ALGID_3DES_3KEY_EDE,
 147                 encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
 148                 keyData, keyLen);
 149         if(keyLen != DES3_KEY_SIZE_BYTES) {
 150                 CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
 151         }
 152
 153     if (DesInst != NULL) {
 154         CCCryptorRelease(DesInst);
 155     }
 156
 157     (void) CCCryptorCreateWithMode(0, kCCModeECB, kCCAlgorithm3DES, ccDefaultPadding, NULL, keyData, kCCKeySize3DES, NULL, 0, 0, 0, &DesInst);
 158
 159         /* Finally, have BlockCryptor do its setup */
 160         setup(DES3_BLOCK_SIZE_BYTES, context);
 161 }
 162
 163 /*
 164  * Functions called by BlockCryptor
 165  * DES does encrypt/decrypt in place
 166  */
 167 void DES3Context::encryptBlock(
 168         const void              *plainText,                     // length implied (one block)
 169         size_t                  plainTextLen,
 170         void                    *cipherText,
 171         size_t                  &cipherTextLen,         // in/out, throws on overflow
 172         bool                    final)                          // ignored
 173 {
 174         if(plainTextLen != DES3_BLOCK_SIZE_BYTES) {
 175                 CssmError::throwMe(CSSMERR_CSP_INPUT_LENGTH_ERROR);
 176         }
 177         if(cipherTextLen < DES3_BLOCK_SIZE_BYTES) {
 178                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
 179         }
 180     (void) CCCryptorEncryptDataBlock(DesInst, NULL, plainText, DES3_BLOCK_SIZE_BYTES, cipherText);
 181         cipherTextLen = DES3_BLOCK_SIZE_BYTES;
 182 }
 183
 184 void DES3Context::decryptBlock(
 185         const void              *cipherText,            // length implied (one block)
 186         size_t                  cipherTextLen,
 187         void                    *plainText,
 188         size_t                  &plainTextLen,          // in/out, throws on overflow
 189         bool                    final)                          // ignored
 190 {
 191         if(plainTextLen < DES3_BLOCK_SIZE_BYTES) {
 192                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
 193         }
 194     (void) CCCryptorDecryptDataBlock(DesInst, NULL, cipherText, DES3_BLOCK_SIZE_BYTES, plainText);
 195         plainTextLen = DES3_BLOCK_SIZE_BYTES;
 196 }