cryptoservices/certificateandkeymgmt/inc/pkcs7encrypteddataobject.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 10 Sep 2009 14:01:51 +0300
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/*
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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/**
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 @file
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 @publishedPartner
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 @released 
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*/
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#ifndef __PKCS7_ENCRYPTED_DATA_OBJECT_H__
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#define __PKCS7_ENCRYPTED_DATA_OBJECT_H__
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#include <asn1dec.h>
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#include <signed.h>
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#include <pbedata.h>
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#include <asnpkcs.h>
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#include <pkcs7contentinfo_v2.h>
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#include <pkcs12kdf.h>
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/**
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 A representation of a PKCS7 (Encrypted data) entity
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 This class decodes the PKCS7 Encrypted Data content. 
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 It provides various exported methods which will 
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 return the values present in the EncryptedData ::= SEQUENCE.
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 */
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class CPKCS7EncryptedDataObject : public CBase
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	{
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public:
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	enum TContentType
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	/**
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	 Identifies the type of ContentType present in the EncryptedContentInfo ::= SEQUENCE
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	 */
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		{
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	    EPkcs7Data = 1
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		};  
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   	/**
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	 Creates a new PKCS#7 EncryptedData object. 
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	 @param     aContentInfo contains a reference to CPKCS7ContentInfo.
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	 @return    A pointer to the newly allocated object.
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	 */
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	IMPORT_C static CPKCS7EncryptedDataObject* NewL(const CPKCS7ContentInfo& aContentInfo);
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	/**
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	 Destructor.
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	 */
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	virtual ~CPKCS7EncryptedDataObject();
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    /**
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     Provides access to the version number within the EncryptedData SEQUENCE.
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     Version is the syntax version number.It shall be 0 for this version of the standard
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	 @return    The version number
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	 */ 
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    IMPORT_C TInt Version() const;
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	/**
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	 Provides access to the ContentType present within the EncryptedContentInfo. 
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	 ContentType indicates the type of content.This is represented using the OID.
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     @return    ContentType present in the EncryptedContentInfo structure.
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     */ 
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    IMPORT_C CPKCS7EncryptedDataObject::TContentType ContentType() const;
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    /**
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     Provides access to the encryptedContent within the EncryptedContentInfo SEQUENCE.
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     encryptedContent is OPTIONAL in EncryptedContentInfo SEQUENCE
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     This will return a NULL pointer in case there is no encryptedContent
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	 @return    The encryptedContent
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     */
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	IMPORT_C const TDesC8& EncryptedContentInfoData() const;
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    /**
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     Provides access to the contentEncryptionAlgorithm within the 
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     EncryptedContentInfo SEQUENCE.
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	 @return    A CPBEncryptParms object which has the Encrypt Parameters 
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     			EncryptedContent present in EncryptedContentInfo Sequence
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     */
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    IMPORT_C const CPBEncryptParms& EncryptParams() const;
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    /**
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	 This method decrypts the encrypted information. The caller assumes 
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	 ownership of the returned object.
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	 @param     aPassword is the password used for decryption.
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	 @return    The plaintext data obtained after decryption.
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	 @leave     KErrNotSupported if otherthan pkcs12 pbeIds used.
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	 @leave     KErrGeneral if decrypt descriptor length is less than 0.
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	 @see		PKCS12KDF, TPBPassword, CPBEncryptElement, CPBDecryptor.
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	 */
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	IMPORT_C HBufC8* DecryptDataL(const TDesC& aPassword) const;
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private:
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	/**
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	 Constructor.
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	 */
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    CPKCS7EncryptedDataObject(void);
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    /**
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     Copy Constructor.
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     @param aEncryptedDataObject A CPKCS7EncryptedDataObject object.
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     */
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    CPKCS7EncryptedDataObject(const CPKCS7EncryptedDataObject& aEncryptedDataObject);
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    /**
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	 Assignment operator.
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	 @param aEncryptedDataObject A CPKCS7EncryptedDataObject object.
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	 @return A reference to CPKCS7EncryptedDataObject class.
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	 */
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	CPKCS7EncryptedDataObject& operator=(const CPKCS7EncryptedDataObject& aEncryptedDataObject);
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    /**    	
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     This decrypt the encrypted data. Below is the ASN1 syntax.
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	 EncryptedData ::= SEQUENCE
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	  	 {
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	     version                Version,
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	     encryptedContentInfo   EncryptedContentInfo
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	  	 } 
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	 EncryptedContentInfo ::= SEQUENCE 
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	  	 {
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	     contentType                 PKCS7-CONTENT-TYPE.&id({PKCS7ContentTable}),
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	     contentEncryptionAlgorithm  ContentEncryptionAlgorithmIdentifier,
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	     encryptedContent            [0]  ENCRYPTED{PKCS7-CONTENT-TYPE.&Type({PKCS7ContentTable}{@.contentType})} OPTIONAL
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	  	 }
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	 EncryptedContent ::= OCTET STRING
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	 ContentInfo ::= SEQUENCE 
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	  	{
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	    contentType ContentType,
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	    content[0] EXPLICIT ANY DEFINED BY contentType OPTIONAL 
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	  	}
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	 ContentType ::= OBJECT IDENTIFIER
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	 @param 	aContentInfo Contains a reference to  CPKCS7ContentInfo
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	 @leave		KErrArgument if the data is not valid PKCS#7 EncryptedData Structure.
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	 @see       CPKCS7ContentInfo
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     */
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	void ConstructL(const CPKCS7ContentInfo& aContentInfo);
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	/**
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     Provides access to the Encrypt Parameters present within the 
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     ContentEncryptionAlgorithm Sequence. Below is the ASN1 Syntax.
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     ContentEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
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     AlgorithmIdentifier: A type that identifies an algorithm (by object identifier) and associated parameters
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     AlgorithmIdentifier ::= SEQUENCE 
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               {
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               algorithm   ALGORITHM.&id({SupportedAlgorithms}),
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               parameters  ALGORITHM.&Type({SupportedAlgorithms}{@ algorithm}) OPTIONAL
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               }
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	 @param     aBinaryData  which is the ContentEncryptionAlgorithmIdentifier
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	            and is AlgorithIdentifier Type.
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	            AlgorithmIdentifier: A type that identifies an 
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	            algorithm (by object identifier) and associated parameters.
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     @return    Encrypt Parameters. This Identifies the 
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	            content-encryption algorithm (and any associated parameters) 
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	            under which the content is encrypted.
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	 @leave     KErrArgument if the data is not valid PKCS#7 ContentEncryptionAlgorithm 
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	 			sequence.
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	 @see 	    CPBEncryptParms, TASN1DecPKCS5.
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     */ 
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    CPBEncryptParms* DecodeContentEncryptionAlgorithmL(const TDesC8& aBinaryData) const;
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private:
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     /** version is the syntax version number in PKCS#7 EncryptedData ::= SEQUENCE*/
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     TInt iVersion;
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	 /** Indicates the type of content in PKCS7 EncryptedContentInfo Sequence */
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	 TContentType iContentType;
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	 /** Identifies the content-encryption algorithm (and any associated parameters) 
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	     under which the content is encrypted */
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     CPBEncryptParms* iEncryptParams;
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	 /** Contains the encrypted content */
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	 TPtrC8 iEncryptedContent;
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};
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#endif //__PKCS7_ENCRYPTED_DATA_OBJECT_H__