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	/*
	context.cpp - wraps a gpgme key context
	Copyright (C) 2003 Klarälvdalens Datakonsult AB

	This file is part of GPGME++.

	GPGME++ is free software; you can redistribute it and/or
	modify it under the terms of the GNU Library General Public
	License as published by the Free Software Foundation; either
	version 2 of the License, or (at your option) any later version.

	GPGME++ is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU Library General Public License for more details.

	You should have received a copy of the GNU Library General Public License
	along with GPGME++; see the file COPYING.LIB. If not, write to the
	Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	Boston, MA 02110-1301, USA.
	*/

	#include <config-gpgme++.h>

	#include <gpgme++/context.h>
	#include <gpgme++/eventloopinteractor.h>
	#include <gpgme++/trustitem.h>
	#include <gpgme++/keylistresult.h>
	#include <gpgme++/keygenerationresult.h>
	#include <gpgme++/importresult.h>
	#include <gpgme++/decryptionresult.h>
	#include <gpgme++/verificationresult.h>
	#include <gpgme++/signingresult.h>
	#include <gpgme++/encryptionresult.h>
	#include <gpgme++/engineinfo.h>

	#include "callbacks.h"
	#include "data_p.h"
	#include "context_p.h"
	#include "util.h"

	#include <gpgme.h>

	//#include <string>
	//using std::string;
	#ifndef NDEBUG
	#include <iostream>
	using std::cerr;
	using std::endl;
	#endif

	#include <cassert>

	static inline GpgME::Error makeError( gpg_err_code_t code ) {
	return GpgME::Error( gpg_err_make( (gpg_err_source_t)22, code ) );
	}

	namespace GpgME {

	const char * Error::source() const {
	return gpgme_strsource( (gpgme_error_t)mErr );
	}

	const char * Error::asString() const {
	return gpgme_strerror( (gpgme_error_t)mErr );
	}

	int Error::code() const {
	return gpgme_err_code( mErr );
	}

	int Error::sourceID() const {
	return gpgme_err_source( mErr );
	}

	bool Error::isCanceled() const {
	return code() == GPG_ERR_CANCELED;
	}

	Context::Context( gpgme_ctx_t ctx ) {
	d = new Private( ctx );
	}

	Context::~Context() {
	delete d; d = 0;
	}

	Context * Context::createForProtocol( Protocol proto ) {
	gpgme_ctx_t ctx = 0;
	if ( gpgme_new ( &ctx ) != 0 )
	return 0;

	switch ( proto ) {
	case OpenPGP:
	if ( gpgme_set_protocol( ctx, GPGME_PROTOCOL_OpenPGP ) != 0 ) {
	gpgme_release( ctx );
	return 0;
	}
	break;
	case CMS:
	if ( gpgme_set_protocol( ctx, GPGME_PROTOCOL_CMS ) != 0 ) {
	gpgme_release( ctx );
	return 0;
	}
	break;
	default:
	return 0;
	}

	return new Context( ctx );
	}

	//
	//
	// Context attributes:
	//
	//

	Protocol Context::protocol() const {
	gpgme_protocol_t p = gpgme_get_protocol( d->ctx );
	switch ( p ) {
	case GPGME_PROTOCOL_OpenPGP: return OpenPGP;
	case GPGME_PROTOCOL_CMS: return CMS;
	default: return UnknownProtocol;
	}
	}


	void Context::setArmor( bool useArmor ) {
	gpgme_set_armor( d->ctx, int( useArmor ) );
	}
	bool Context::armor() const {
	return gpgme_get_armor( d->ctx );
	}

	void Context::setTextMode( bool useTextMode ) {
	gpgme_set_textmode( d->ctx, int( useTextMode ) );
	}
	bool Context::textMode() const {
	return gpgme_get_textmode( d->ctx );
	}

	void Context::setIncludeCertificates( int which ) {
	if ( which == DefaultCertificates ) {
	#ifdef HAVE_GPGME_INCLUDE_CERTS_DEFAULT
	which = GPGME_INCLUDE_CERTS_DEFAULT;
	#else
	which = 1;
	#endif
	}
	gpgme_set_include_certs( d->ctx, which );
	}

	int Context::includeCertificates() const {
	return gpgme_get_include_certs( d->ctx );
	}

	void Context::setKeyListMode( unsigned int mode ) {
	gpgme_set_keylist_mode( d->ctx, add_to_gpgme_keylist_mode_t( 0, mode ) );
	}

	void Context::addKeyListMode( unsigned int mode ) {
	const unsigned int cur = gpgme_get_keylist_mode( d->ctx );
	gpgme_set_keylist_mode( d->ctx, add_to_gpgme_keylist_mode_t( cur, mode ) );
	}


	unsigned int Context::keyListMode() const {
	return convert_from_gpgme_keylist_mode_t( gpgme_get_keylist_mode( d->ctx ) );
	}

	void Context::setProgressProvider( ProgressProvider * provider ) {
	gpgme_set_progress_cb( d->ctx, provider ? &progress_callback : 0, provider );
	}
	ProgressProvider * Context::progressProvider() const {
	void * pp = 0;
	gpgme_progress_cb_t pcb = &progress_callback;
	gpgme_get_progress_cb( d->ctx, &pcb, &pp );
	return static_cast<ProgressProvider*>( pp );
	}

	void Context::setPassphraseProvider( PassphraseProvider * provider ) {
	gpgme_set_passphrase_cb( d->ctx, provider ? &passphrase_callback : 0, provider );
	}

	PassphraseProvider * Context::passphraseProvider() const {
	void * pp = 0;
	gpgme_passphrase_cb_t pcb = &passphrase_callback;
	gpgme_get_passphrase_cb( d->ctx, &pcb, &pp );
	return static_cast<PassphraseProvider*>( pp );
	}

	void Context::setManagedByEventLoopInteractor( bool manage ) {
	if ( !EventLoopInteractor::instance() ) {
	#ifndef NDEBUG
	cerr << "Context::setManagedByEventLoopInteractor(): "
	"You must create an instance of EventLoopInteractor "
	"before using anything that needs one." << endl;
	#endif
	return;
	}
	if ( manage )
	EventLoopInteractor::instance()->manage( this );
	else
	EventLoopInteractor::instance()->unmanage( this );
	}
	bool Context::managedByEventLoopInteractor() const {
	return d->iocbs != 0;
	}


	void Context::installIOCallbacks( gpgme_io_cbs * iocbs ) {
	if ( !iocbs ) {
	uninstallIOCallbacks();
	return;
	}
	gpgme_set_io_cbs( d->ctx, iocbs );
	delete d->iocbs; d->iocbs = iocbs;
	}

	void Context::uninstallIOCallbacks() {
	static gpgme_io_cbs noiocbs = { 0, 0, 0, 0, 0 };
	// io.add == 0 means disable io callbacks:
	gpgme_set_io_cbs( d->ctx, &noiocbs );
	delete d->iocbs; d->iocbs = 0;
	}

	Error Context::setLocale( int cat, const char * val ) {
	return Error( d->lasterr = gpgme_set_locale( d->ctx, cat, val ) );
	}

	EngineInfo Context::engineInfo() const {
	#ifdef HAVE_GPGME_CTX_GETSET_ENGINE_INFO
	return EngineInfo( gpgme_ctx_get_engine_info( d->ctx ) );
	#else
	return EngineInfo();
	#endif
	}

	Error Context::setEngineFileName( const char * filename ) {
	#ifdef HAVE_GPGME_CTX_GETSET_ENGINE_INFO
	const char * const home_dir = engineInfo().homeDirectory();
	return Error( gpgme_ctx_set_engine_info( d->ctx, gpgme_get_protocol( d->ctx ), filename, home_dir ) );
	#else
	return makeError( GPG_ERR_NOT_IMPLEMENTED );
	#endif
	}

	Error Context::setEngineHomeDirectory( const char * home_dir ) {
	#ifdef HAVE_GPGME_CTX_GETSET_ENGINE_INFO
	const char * const filename = engineInfo().fileName();
	return Error( gpgme_ctx_set_engine_info( d->ctx, gpgme_get_protocol( d->ctx ), filename, home_dir ) );
	#else
	return makeError( GPG_ERR_NOT_IMPLEMENTED );
	#endif
	}

	//
	//
	// Key Management
	//
	//

	Error Context::startKeyListing( const char * pattern, bool secretOnly ) {
	d->lastop = Private::KeyList;
	return Error( d->lasterr = gpgme_op_keylist_start( d->ctx, pattern, int( secretOnly ) ) );
	}

	Error Context::startKeyListing( const char * patterns[], bool secretOnly ) {
	d->lastop = Private::KeyList;
	return Error( d->lasterr = gpgme_op_keylist_ext_start( d->ctx, patterns, int( secretOnly ), 0 ) );
	}

	Key Context::nextKey( GpgME::Error & e ) {
	d->lastop = Private::KeyList;
	gpgme_key_t key;
	e = Error( d->lasterr = gpgme_op_keylist_next( d->ctx, &key ) );
	return Key( key, false );
	}

	KeyListResult Context::endKeyListing() {
	d->lasterr = gpgme_op_keylist_end( d->ctx );
	return keyListResult();
	}

	KeyListResult Context::keyListResult() const {
	return KeyListResult( d->ctx, d->lasterr );
	}

	Key Context::key( const char * fingerprint, GpgME::Error & e , bool secret /, bool forceUpdate/ ) {
	d->lastop = Private::KeyList;
	gpgme_key_t key;
	e = Error( d->lasterr = gpgme_get_key( d->ctx, fingerprint, &key, int( secret )/, int( forceUpdate )/ ) );
	return Key( key, false );
	}

	KeyGenerationResult Context::generateKey( const char * parameters, Data & pubKey ) {
	d->lastop = Private::KeyGen;
	Data::Private * const dp = pubKey.impl();
	d->lasterr = gpgme_op_genkey( d->ctx, parameters, dp ? dp->data : 0, 0 );
	return KeyGenerationResult( d->ctx, d->lasterr );
	}

	Error Context::startKeyGeneration( const char * parameters, Data & pubKey ) {
	d->lastop = Private::KeyGen;
	Data::Private * const dp = pubKey.impl();
	return Error( d->lasterr = gpgme_op_genkey_start( d->ctx, parameters, dp ? dp->data : 0, 0 ) );
	}

	KeyGenerationResult Context::keyGenerationResult() const {
	if ( d->lastop & Private::KeyGen )
	return KeyGenerationResult( d->ctx, d->lasterr );
	else
	return KeyGenerationResult();
	}

	Error Context::exportPublicKeys( const char * pattern, Data & keyData ) {
	d->lastop = Private::Export;
	Data::Private * const dp = keyData.impl();
	return Error( d->lasterr = gpgme_op_export( d->ctx, pattern, 0, dp ? dp->data : 0 ) );
	}

	Error Context::exportPublicKeys( const char * patterns[], Data & keyData ) {
	d->lastop = Private::Export;
	Data::Private * const dp = keyData.impl();
	return Error( d->lasterr = gpgme_op_export_ext( d->ctx, patterns, 0, dp ? dp->data : 0 ) );
	}

	Error Context::startPublicKeyExport( const char * pattern, Data & keyData ) {
	d->lastop = Private::Export;
	Data::Private * const dp = keyData.impl();
	return Error( d->lasterr = gpgme_op_export_start( d->ctx, pattern, 0, dp ? dp->data : 0 ) );
	}

	Error Context::startPublicKeyExport( const char * patterns[], Data & keyData ) {
	d->lastop = Private::Export;
	Data::Private * const dp = keyData.impl();
	return Error( d->lasterr = gpgme_op_export_ext_start( d->ctx, patterns, 0, dp ? dp->data : 0 ) );
	}


	ImportResult Context::importKeys( const Data & data ) {
	d->lastop = Private::Import;
	const Data::Private * const dp = data.impl();
	d->lasterr = gpgme_op_import( d->ctx, dp ? dp->data : 0 );
	return ImportResult( d->ctx, d->lasterr );
	}

	Error Context::startKeyImport( const Data & data ) {
	d->lastop = Private::Import;
	const Data::Private * const dp = data.impl();
	return Error( d->lasterr = gpgme_op_import_start( d->ctx, dp ? dp->data : 0 ) );
	}

	ImportResult Context::importResult() const {
	if ( d->lastop & Private::Import )
	return ImportResult( d->ctx, d->lasterr );
	else
	return ImportResult();
	}

	Error Context::deleteKey( const Key & key, bool allowSecretKeyDeletion ) {
	d->lastop = Private::Delete;
	return Error( d->lasterr = gpgme_op_delete( d->ctx, key.impl(), int( allowSecretKeyDeletion ) ) );
	}

	Error Context::startKeyDeletion( const Key & key, bool allowSecretKeyDeletion ) {
	d->lastop = Private::Delete;
	return Error( d->lasterr = gpgme_op_delete_start( d->ctx, key.impl(), int( allowSecretKeyDeletion ) ) );
	}

	Error Context::startTrustItemListing( const char * pattern, int maxLevel ) {
	d->lastop = Private::TrustList;
	return Error( d->lasterr = gpgme_op_trustlist_start( d->ctx, pattern, maxLevel ) );
	}

	TrustItem Context::nextTrustItem( Error & e ) {
	gpgme_trust_item_t ti = 0;
	e = Error( d->lasterr = gpgme_op_trustlist_next( d->ctx, &ti ) );
	return TrustItem( ti );
	}

	Error Context::endTrustItemListing() {
	return Error( d->lasterr = gpgme_op_trustlist_end( d->ctx ) );
	}

	DecryptionResult Context::decrypt( const Data & cipherText, Data & plainText ) {
	d->lastop = Private::Decrypt;
	const Data::Private * const cdp = cipherText.impl();
	Data::Private * const pdp = plainText.impl();
	d->lasterr = gpgme_op_decrypt( d->ctx, cdp ? cdp->data : 0, pdp ? pdp->data : 0 );
	return DecryptionResult( d->ctx, d->lasterr );
	}

	Error Context::startDecryption( const Data & cipherText, Data & plainText ) {
	d->lastop = Private::Decrypt;
	const Data::Private * const cdp = cipherText.impl();
	Data::Private * const pdp = plainText.impl();
	return Error( d->lasterr = gpgme_op_decrypt_start( d->ctx, cdp ? cdp->data : 0, pdp ? pdp->data : 0 ) );
	}

	DecryptionResult Context::decryptionResult() const {
	if ( d->lastop & Private::Decrypt )
	return DecryptionResult( d->ctx, d->lasterr );
	else
	return DecryptionResult();
	}



	VerificationResult Context::verifyDetachedSignature( const Data & signature, const Data & signedText ) {
	d->lastop = Private::Verify;
	const Data::Private * const sdp = signature.impl();
	const Data::Private * const tdp = signedText.impl();
	d->lasterr = gpgme_op_verify( d->ctx, sdp ? sdp->data : 0, tdp ? tdp->data : 0, 0 );
	return VerificationResult( d->ctx, d->lasterr );
	}

	VerificationResult Context::verifyOpaqueSignature( const Data & signedData, Data & plainText ) {
	d->lastop = Private::Verify;
	const Data::Private * const sdp = signedData.impl();
	Data::Private * const pdp = plainText.impl();
	d->lasterr = gpgme_op_verify( d->ctx, sdp ? sdp->data : 0, 0, pdp ? pdp->data : 0 );
	return VerificationResult( d->ctx, d->lasterr );
	}

	Error Context::startDetachedSignatureVerification( const Data & signature, const Data & signedText ) {
	d->lastop = Private::Verify;
	const Data::Private * const sdp = signature.impl();
	const Data::Private * const tdp = signedText.impl();
	return Error( d->lasterr = gpgme_op_verify_start( d->ctx, sdp ? sdp->data : 0, tdp ? tdp->data : 0, 0 ) );
	}

	Error Context::startOpaqueSignatureVerification( const Data & signedData, Data & plainText ) {
	d->lastop = Private::Verify;
	const Data::Private * const sdp = signedData.impl();
	Data::Private * const pdp = plainText.impl();
	return Error( d->lasterr = gpgme_op_verify_start( d->ctx, sdp ? sdp->data : 0, 0, pdp ? pdp->data : 0 ) );
	}

	VerificationResult Context::verificationResult() const {
	if ( d->lastop & Private::Verify )
	return VerificationResult( d->ctx, d->lasterr );
	else
	return VerificationResult();
	}


	std::pair<DecryptionResult,VerificationResult> Context::decryptAndVerify( const Data & cipherText, Data & plainText ) {
	d->lastop = Private::DecryptAndVerify;
	const Data::Private * const cdp = cipherText.impl();
	Data::Private * const pdp = plainText.impl();
	d->lasterr = gpgme_op_decrypt_verify( d->ctx, cdp ? cdp->data : 0, pdp ? pdp->data : 0 );
	return std::make_pair( DecryptionResult( d->ctx, d->lasterr ),
	VerificationResult( d->ctx, d->lasterr ) );
	}

	Error Context::startCombinedDecryptionAndVerification( const Data & cipherText, Data & plainText ) {
	d->lastop = Private::DecryptAndVerify;
	const Data::Private * const cdp = cipherText.impl();
	Data::Private * const pdp = plainText.impl();
	return Error( d->lasterr = gpgme_op_decrypt_verify_start( d->ctx, cdp ? cdp->data : 0, pdp ? pdp->data : 0 ) );
	}




	void Context::clearSigningKeys() {
	gpgme_signers_clear( d->ctx );
	}

	Error Context::addSigningKey( const Key & key ) {
	return Error( d->lasterr = gpgme_signers_add( d->ctx, key.impl() ) );
	}

	Key Context::signingKey( unsigned int idx ) const {
	gpgme_key_t key = gpgme_signers_enum( d->ctx, idx );
	return Key( key, false );
	}

	std::vector<Key> Context::signingKeys() const {
	std::vector<Key> result;
	for ( unsigned int i = 0 ; gpgme_key_t key = gpgme_signers_enum( d->ctx, i ) ; ++i )
	result.push_back( Key( key, false ) );
	return result;
	}

	void Context::clearSignatureNotations() {
	#ifdef HAVE_GPGME_SIG_NOTATION_CLEARADDGET
	gpgme_sig_notation_clear( d->ctx );
	#endif
	}

	GpgME::Error Context::addSignatureNotation( const char * name, const char * value, unsigned int flags ) {
	#ifdef HAVE_GPGME_SIG_NOTATION_CLEARADDGET
	return Error( gpgme_sig_notation_add( d->ctx, name, value, add_to_gpgme_sig_notation_flags_t( 0, flags ) ) );
	#else
	(void)name; (void)value; (void)flags;
	return makeError( GPG_ERR_NOT_IMPLEMENTED );
	#endif
	}

	GpgME::Error Context::addSignaturePolicyURL( const char * url, bool critical ) {
	#ifdef HAVE_GPGME_SIG_NOTATION_CLEARADDGET
	return Error( gpgme_sig_notation_add( d->ctx, 0, url, critical ? GPGME_SIG_NOTATION_CRITICAL : 0 ) );
	#else
	(void)url; (void)critical;
	return makeError( GPG_ERR_NOT_IMPLEMENTED );
	#endif
	}

	const char * Context::signaturePolicyURL() const {
	#ifdef HAVE_GPGME_SIG_NOTATION_CLEARADDGET
	for ( gpgme_sig_notation_t n = gpgme_sig_notation_get( d->ctx ) ; n ; n = n->next )
	if ( !n->name )
	return n->value;
	#endif
	return 0;
	}

	Notation Context::signatureNotation( unsigned int idx ) const {
	#ifdef HAVE_GPGME_SIG_NOTATION_CLEARADDGET
	for ( gpgme_sig_notation_t n = gpgme_sig_notation_get( d->ctx ) ; n ; n = n->next )
	if ( n->name )
	if ( idx-- == 0 )
	return Notation( n );
	#endif
	return Notation();
	}

	std::vector<Notation> Context::signatureNotations() const {
	std::vector<Notation> result;
	#ifdef HAVE_GPGME_SIG_NOTATION_CLEARADDGET
	for ( gpgme_sig_notation_t n = gpgme_sig_notation_get( d->ctx ) ; n ; n = n->next )
	if ( n->name )
	result.push_back( Notation( n ) );
	#endif
	return result;
	}

	static gpgme_sig_mode_t sigmode2sigmode( SignatureMode mode ) {
	switch ( mode ) {
	default:
	case NormalSignatureMode: return GPGME_SIG_MODE_NORMAL;
	case Detached: return GPGME_SIG_MODE_DETACH;
	case Clearsigned: return GPGME_SIG_MODE_CLEAR;
	}
	}

	SigningResult Context::sign( const Data & plainText, Data & signature, SignatureMode mode ) {
	d->lastop = Private::Sign;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const sdp = signature.impl();
	d->lasterr = gpgme_op_sign( d->ctx, pdp ? pdp->data : 0, sdp ? sdp->data : 0, sigmode2sigmode( mode ) );
	return SigningResult( d->ctx, d->lasterr );
	}


	Error Context::startSigning( const Data & plainText, Data & signature, SignatureMode mode ) {
	d->lastop = Private::Sign;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const sdp = signature.impl();
	return Error( d->lasterr = gpgme_op_sign_start( d->ctx, pdp ? pdp->data : 0, sdp ? sdp->data : 0, sigmode2sigmode( mode ) ) );
	}

	SigningResult Context::signingResult() const {
	if ( d->lastop & Private::Sign )
	return SigningResult( d->ctx, d->lasterr );
	else
	return SigningResult();
	}


	EncryptionResult Context::encrypt( const std::vector<Key> & recipients, const Data & plainText, Data & cipherText, EncryptionFlags flags ) {
	d->lastop = Private::Encrypt;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const cdp = cipherText.impl();
	gpgme_key_t * const keys = new gpgme_key_t[ recipients.size() + 1 ];
	gpgme_key_t * keys_it = keys;
	for ( std::vector<Key>::const_iterator it = recipients.begin() ; it != recipients.end() ; ++it )
	if ( it->impl() )
	*keys_it++ = it->impl();
	*keys_it++ = 0;
	d->lasterr = gpgme_op_encrypt( d->ctx, keys,
	flags & AlwaysTrust ? GPGME_ENCRYPT_ALWAYS_TRUST : (gpgme_encrypt_flags_t)0,
	pdp ? pdp->data : 0, cdp ? cdp->data : 0 );
	delete[] keys;
	return EncryptionResult( d->ctx, d->lasterr );
	}

	Error Context::encryptSymmetrically( const Data & plainText, Data & cipherText ) {
	d->lastop = Private::Encrypt;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const cdp = cipherText.impl();
	return Error( d->lasterr = gpgme_op_encrypt( d->ctx, 0, (gpgme_encrypt_flags_t)0,
	pdp ? pdp->data : 0, cdp ? cdp->data : 0 ) );
	}

	Error Context::startEncryption( const std::vector<Key> & recipients, const Data & plainText, Data & cipherText, EncryptionFlags flags ) {
	d->lastop = Private::Encrypt;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const cdp = cipherText.impl();
	gpgme_key_t * const keys = new gpgme_key_t[ recipients.size() + 1 ];
	gpgme_key_t * keys_it = keys;
	for ( std::vector<Key>::const_iterator it = recipients.begin() ; it != recipients.end() ; ++it )
	if ( it->impl() )
	*keys_it++ = it->impl();
	*keys_it++ = 0;
	d->lasterr = gpgme_op_encrypt_start( d->ctx, keys,
	flags & AlwaysTrust ? GPGME_ENCRYPT_ALWAYS_TRUST : (gpgme_encrypt_flags_t)0,
	pdp ? pdp->data : 0, cdp ? cdp->data : 0 );
	delete[] keys;
	return Error( d->lasterr );
	}

	EncryptionResult Context::encryptionResult() const {
	if ( d->lastop & Private::Encrypt )
	return EncryptionResult( d->ctx, d->lasterr );
	else
	return EncryptionResult();
	}

	std::pair<SigningResult,EncryptionResult> Context::signAndEncrypt( const std::vector<Key> & recipients, const Data & plainText, Data & cipherText, EncryptionFlags flags ) {
	d->lastop = Private::SignAndEncrypt;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const cdp = cipherText.impl();
	gpgme_key_t * const keys = new gpgme_key_t[ recipients.size() + 1 ];
	gpgme_key_t * keys_it = keys;
	for ( std::vector<Key>::const_iterator it = recipients.begin() ; it != recipients.end() ; ++it )
	if ( it->impl() )
	*keys_it++ = it->impl();
	*keys_it++ = 0;
	d->lasterr = gpgme_op_encrypt_sign( d->ctx, keys,
	flags & AlwaysTrust ? GPGME_ENCRYPT_ALWAYS_TRUST : (gpgme_encrypt_flags_t)0,
	pdp ? pdp->data : 0, cdp ? cdp->data : 0 );
	delete[] keys;
	return std::make_pair( SigningResult( d->ctx, d->lasterr ),
	EncryptionResult( d->ctx, d->lasterr ) );
	}

	Error Context::startCombinedSigningAndEncryption( const std::vector<Key> & recipients, const Data & plainText, Data & cipherText, EncryptionFlags flags ) {
	d->lastop = Private::SignAndEncrypt;
	const Data::Private * const pdp = plainText.impl();
	Data::Private * const cdp = cipherText.impl();
	gpgme_key_t * const keys = new gpgme_key_t[ recipients.size() + 1 ];
	gpgme_key_t * keys_it = keys;
	for ( std::vector<Key>::const_iterator it = recipients.begin() ; it != recipients.end() ; ++it )
	if ( it->impl() )
	*keys_it++ = it->impl();
	*keys_it++ = 0;
	d->lasterr = gpgme_op_encrypt_sign_start( d->ctx, keys,
	flags & AlwaysTrust ? GPGME_ENCRYPT_ALWAYS_TRUST : (gpgme_encrypt_flags_t)0,
	pdp ? pdp->data : 0, cdp ? cdp->data : 0 );
	delete[] keys;
	return Error( d->lasterr );
	}


	Error Context::cancelPendingOperation() {
	return Error( gpgme_cancel( d->ctx ) );
	}

	bool Context::poll() {
	gpgme_error_t e = GPG_ERR_NO_ERROR;
	const bool finished = gpgme_wait( d->ctx, &e, 0 );
	if ( finished )
	d->lasterr = e;
	return finished;
	}

	Error Context::wait() {
	gpgme_error_t e = GPG_ERR_NO_ERROR;
	gpgme_wait( d->ctx, &e, 1 );
	return Error( d->lasterr = e );
	}

	Error Context::lastError() const {
	return Error( d->lasterr );
	}


	} // namespace GpgME

	GpgME::Error GpgME::setDefaultLocale( int cat, const char * val ) {
	return Error( gpgme_set_locale( 0, cat, val ) );
	}

	GpgME::EngineInfo GpgME::engineInfo( GpgME::Protocol proto ) {
	gpgme_engine_info_t ei = 0;
	if ( gpgme_get_engine_info( &ei ) )
	return EngineInfo();

	const gpgme_protocol_t p = proto == CMS ? GPGME_PROTOCOL_CMS : GPGME_PROTOCOL_OpenPGP ;

	for ( gpgme_engine_info_t i = ei ; i ; i = i->next )
	if ( i->protocol == p )
	return EngineInfo( i );

	return EngineInfo();
	}

	GpgME::Error GpgME::checkEngine( GpgME::Protocol proto ) {
	const gpgme_protocol_t p = proto == CMS ? GPGME_PROTOCOL_CMS : GPGME_PROTOCOL_OpenPGP ;

	return Error( gpgme_engine_check_version( p ) );
	}

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