Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_apple_csp / lib / ascContext.h

diff --git a/Security/libsecurity_apple_csp/lib/ascContext.h b/Security/libsecurity_apple_csp/lib/ascContext.h
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+/*
+ * Copyright (c) 2001,2011,2013-2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The 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.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+#ifdef ASC_CSP_ENABLE
+
+#ifndef _ASC_CONTEXT_H_
+#define _ASC_CONTEXT_H_
+
+#include "AppleCSPContext.h"
+#include <security_comcryption/comcryption.h>
+
+/* symmetric encrypt/decrypt context */
+class ASCContext : public AppleCSPContext {
+public:
+       ASCContext(AppleCSPSession &session) :
+               AppleCSPContext(session),
+               mCcObj(NULL)    { }
+       ~ASCContext();
+       
+       // called by CSPFullPluginSession
+       void init(
+               const Context   &context, 
+               bool encoding = true);
+       void update(
+               void                    *inp, 
+               size_t                  &inSize,                        // in/out
+               void                    *outp, 
+               size_t                  &outSize);                      // in/out
+       void final(
+               CssmData                &out);
+
+       size_t inputSize(
+               size_t                  outSize);                       // input for given output size
+       size_t outputSize(
+               bool                    final = false, 
+               size_t                  inSize = 0);            // output for given input size
+       void minimumProgress(
+               size_t                  &in, 
+               size_t                  &out);                          // minimum progress chunks
+       
+private:
+       comcryptObj                     mCcObj;
+       
+       /*
+        * For first implementation, we have to cope with the fact that the final
+        * decrypt call down to the comcryption engine requires *some* ciphertext.
+        * On decrypt, we'll just save one byte on each update in preparation for
+        * the final call. Hopefull we'll have time to fix deComcryptData() so this
+        * is unneccesary.
+        */
+       unsigned char           mDecryptBuf;
+       bool                            mDecryptBufValid;
+       
+};     /* RC4Context */
+
+#endif         /*_ASC_CONTEXT_H_ */
+#endif /* ASC_CSP_ENABLE */