Security-55163.44.tar.gz

[apple/security.git] / libsecurity_apple_csp / lib / bfContext.cpp

diff --git a/libsecurity_apple_csp/lib/bfContext.cpp b/libsecurity_apple_csp/lib/bfContext.cpp
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+/*
+ * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
+ * 
+ * The contents of this file constitute Original Code as defined in and are
+ * subject to the Apple Public Source License Version 1.2 (the 'License').
+ * You may not use this file except in compliance with the License. Please obtain
+ * a copy of the License at http://www.apple.com/publicsource and read it before
+ * using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
+ * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
+ * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
+ * specific language governing rights and limitations under the License.
+ */
+
+
+/*
+ * bfContext.cpp - glue between BlockCrytpor and ssleay Blowfish
+ *                              implementation
+ * Written by Doug Mitchell 4/23/2003
+ */
+ 
+#include "bfContext.h"
+
+BlowfishContext::~BlowfishContext()
+{
+       deleteKey();
+}
+
+void BlowfishContext::deleteKey()
+{
+       memset(&mBfKey, 0, sizeof(mBfKey));
+       mInitFlag = false;
+}
+
+/* 
+ * Standard CSPContext init, called from CSPFullPluginSession::init().
+ * Reusable, e.g., query followed by en/decrypt.
+ */
+void BlowfishContext::init( 
+       const Context &context, 
+       bool encrypting)
+{
+       if(mInitFlag && !opStarted()) {
+               return;
+       }
+
+       CSSM_SIZE       keyLen;
+       uint8           *keyData = NULL;
+       bool            sameKeySize = false;
+       
+       /* obtain key from context */
+       symmetricKeyBits(context, session(), CSSM_ALGID_BLOWFISH, 
+               encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
+               keyData, keyLen);
+       if((keyLen < BF_MIN_KEY_SIZE_BYTES) || (keyLen > BF_MAX_KEY_SIZE_BYTES)) {
+               CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
+       }
+       
+       /*
+        * Delete existing key if key size changed
+        */
+       if(mRawKeySize == keyLen) {
+               sameKeySize = true;
+       }
+       else {
+               deleteKey();
+       }
+
+       /* init key only if key size or key bits have changed */
+       if(!sameKeySize || memcmp(mRawKey, keyData, mRawKeySize)) {
+               BF_set_key(&mBfKey, keyLen, keyData);
+       
+               /* save this raw key data */
+               memmove(mRawKey, keyData, keyLen); 
+               mRawKeySize = keyLen;
+       }
+       
+       /* Finally, have BlockCryptor do its setup */
+       setup(BF_BLOCK, context);
+       mInitFlag = true;
+}      
+
+/*
+ * Functions called by BlockCryptor
+ */
+void BlowfishContext::encryptBlock(
+       const void              *plainText,                     // length implied (one block)
+       size_t                  plainTextLen,
+       void                    *cipherText,    
+       size_t                  &cipherTextLen,         // in/out, throws on overflow
+       bool                    final)                          // ignored
+{
+       if(plainTextLen != BF_BLOCK) {
+               CssmError::throwMe(CSSMERR_CSP_INPUT_LENGTH_ERROR);
+       }
+       if(cipherTextLen < BF_BLOCK) {
+               CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+       }
+       BF_ecb_encrypt((const unsigned char *)plainText, (unsigned char *)cipherText,
+               &mBfKey, BF_ENCRYPT);
+       cipherTextLen = BF_BLOCK;
+}
+
+void BlowfishContext::decryptBlock(
+       const void              *cipherText,            // length implied (one block)
+       size_t                  cipherTextLen,
+       void                    *plainText,     
+       size_t                  &plainTextLen,          // in/out, throws on overflow
+       bool                    final)                          // ignored
+{
+       if(plainTextLen < BF_BLOCK) {
+               CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+       }
+       BF_ecb_encrypt((const unsigned char *)cipherText, (unsigned char *)plainText,
+               &mBfKey, BF_DECRYPT);
+       plainTextLen = BF_BLOCK;
+}