Security-55163.44.tar.gz

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

diff --git a/libsecurity_apple_csp/lib/ascContext.h b/libsecurity_apple_csp/lib/ascContext.h
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+++ b/libsecurity_apple_csp/lib/ascContext.h
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+/*
+ * ascContext.h - glue between BlockCrytpor and ComCryption (a.k.a. Apple
+ *                               Secure Compression). 
+ * Written by Doug Mitchell 4/4/2001
+ */
+
+#ifdef ASC_CSP_ENABLE
+
+#ifndef _ASC_CONTEXT_H_
+#define _ASC_CONTEXT_H_
+
+#include "AppleCSPContext.h"
+#include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.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 */