Security-57031.1.35.tar.gz

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

diff --git a/Security/libsecurity_apple_csp/lib/SignatureContext.h b/Security/libsecurity_apple_csp/lib/SignatureContext.h
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+/*
+ * Copyright (c) 2000-2001,2011-2012,2014 Apple 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.
+ */
+
+
+/*
+ * SignatureContext.h - AppleCSPContext subclass for generic sign/verify
+ *
+ * This class performs all of the sign/verify operations in the CSP. The general
+ * scheme is that an instance of this class has references to one DigestObject
+ * and one RawSigner. Sign and Verify "updates" go to the DigestObject. The "final"
+ * operation consists of obtaining the final digest from the DigestObject and 
+ * performing a sign or verify on that data via the RawSigner. 
+ *
+ * This class knows nothing about any of the algorithms involved; all sign and 
+ * verify operations follow this same scheme. Various modules' AlgorithmFactories
+ * construct one of these objects by providing the appropriate DigestObject and
+ * RawSigner. 
+ *
+ * The seemingly special case of "raw RSA sign", in which the app calculates the 
+ * digest separately from the sign operation, is handled via the NullDigest object.
+ */
+ 
+#ifndef        _SIGNATURE_CONTEXT_H_
+#define _SIGNATURE_CONTEXT_H_
+
+#include <RawSigner.h>
+#include <security_cdsa_utilities/digestobject.h>
+#include <AppleCSPContext.h>
+
+class SignatureContext : public AppleCSPContext  {
+public:
+       SignatureContext(
+               AppleCSPSession &session,
+               DigestObject    &digest,
+               RawSigner               &signer) : 
+                       AppleCSPContext(session), 
+                       mDigest(digest), 
+                       mSigner(signer),
+                       mInitFlag(false) { }
+                       
+       ~SignatureContext();
+       
+       /* called out from CSPFullPluginSession....
+        * both sign & verify: */
+       void init(const Context &context, bool isSigning);
+       void update(const CssmData &data);
+       
+       /* sign only */
+       void final(CssmData &out);      
+       
+       /* verify only */
+       void final(const CssmData &in); 
+
+       size_t outputSize(bool final, size_t inSize);
+
+       /* for raw sign/verify - optionally called after init */ 
+       virtual void setDigestAlgorithm(CSSM_ALGORITHMS digestAlg);
+
+
+private:
+       DigestObject    &mDigest;
+       RawSigner               &mSigner;
+       bool                    mInitFlag;                      // true after init
+};
+
+
+#endif /* _SIGNATURE_CONTEXT_H_ */