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/**
 * Licensed to the University Corporation for Advanced Internet
 * Development, Inc. (UCAID) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 *
 * UCAID licenses this file to you under the Apache License,
 * Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the
 * License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */

/**
 * @file xmltooling/security/Credential.h
 *
 * Wraps keys and related functionality.
 */

#if !defined(__xmltooling_cred_h__) && !defined(XMLTOOLING_NO_XMLSEC)
#define __xmltooling_cred_h__

#include <xmltooling/base.h>

#include <set>
#include <string>

class XSECCryptoKey;

namespace xmlsignature {
    class XMLTOOL_API KeyInfo;
};

namespace xmltooling {

    class XMLTOOL_API CredentialCriteria;
    class XMLTOOL_API CredentialContext;

    /**
     * Wraps keys and related functionality.
     *
     * <p>Shared credential implementations should implement reference counting
     * and honor any locking parameters to ensure appropriate synchronization.
     */
    class XMLTOOL_API Credential
    {
        MAKE_NONCOPYABLE(Credential);
    protected:
        Credential();

    public:
        virtual ~Credential();

        /**
         * Bitmask constants for limiting resolution process inside a CredentialResolver.
         */
        enum ResolveTypes {
            RESOLVE_KEYS = 1,
            RESOLVE_NAMES = 2
        };

        /**
         * Bitmask of use cases for credentials.
         */
        enum UsageTypes {
            UNSPECIFIED_CREDENTIAL = 0,
            SIGNING_CREDENTIAL = 1,
            TLS_CREDENTIAL = 2,
            ENCRYPTION_CREDENTIAL = 4
        };

        /**
         * Bitmask of supported KeyInfo content to generate.
         */
        enum KeyInfoTypes {
            KEYINFO_KEY_VALUE = 1,
            KEYINFO_KEY_NAME = 2
        };

        /**
         * Get credential usage types.
         *
         * @return the usage bitmask
         */
        virtual unsigned int getUsage() const=0;

        /**
         * Returns an algorithm identifier for the Credential.
         *
         * @return  the Credential algorithm, or nullptr if indeterminate
         */
        virtual const char* getAlgorithm() const=0;

        /**
         * Returns the size of the key in bits.
         *
         * @return  the key size, or 0 if indeterminate
         */
        virtual unsigned int getKeySize() const=0;

        /**
         * Returns a secret or private key to use for signing or decryption operations.
         *
         * @return  a secret or private key
         */
        virtual XSECCryptoKey* getPrivateKey() const=0;

        /**
         * Returns a secret or public key to use for verification or encryption operations.
         *
         * @return  a secret or public key
         */
        virtual XSECCryptoKey* getPublicKey() const=0;

        /**
         * Returns names representing the Credential.
         *
         * <p>Names should be unique in the context of the comparisons against CredentialCriteria
         * that deployments expect to see.
         *
         * @return  a sorted set of names
         */
        virtual const std::set<std::string>& getKeyNames() const=0;

        /**
         * Returns a ds:KeyInfo object representing the Credential for use in
         * communicating with other entities.
         *
         * @param compact   true iff the communication medium is such that only compact forms should be included
         * @return a KeyInfo object, which must be freed by the caller
         */
        virtual xmlsignature::KeyInfo* getKeyInfo(bool compact=false) const=0;

        /**
         * Get the credential context information, which provides additional information
         * specific to the context in which the credential was resolved.
         *
         * @return resolution context of the credential
         */
        virtual const CredentialContext* getCredentalContext() const;
    };
};

#endif /* __xmltooling_cred_h__ */