First commit

Chapter5/EncryptingOutputStream/EncryptingOutputStream.xcodeproj/xcuserdata/jdovey.xcuserdatad/xcdebugger/Breakpoints.xcbkptlist

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+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   type = "1"
+   version = "1.0">
+   <FileBreakpoints>
+      <FileBreakpoint
+         shouldBeEnabled = "No"
+         ignoreCount = "0"
+         continueAfterRunningActions = "No"
+         filePath = "EncryptingOutputStream/EncryptingOutputStream.m"
+         timestampString = "360534567.306057"
+         startingColumnNumber = "9223372036854775807"
+         endingColumnNumber = "9223372036854775807"
+         startingLineNumber = "30"
+         endingLineNumber = "30"
+         landmarkName = "-initWithFileURL:passPhrase:"
+         landmarkType = "5">
+      </FileBreakpoint>
+   </FileBreakpoints>
+</Bucket>

Chapter5/EncryptingOutputStream/EncryptingOutputStream.xcodeproj/xcuserdata/jdovey.xcuserdatad/xcschemes/EncryptingOutputStream.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0440"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AB0EF855157BDDD200370583"
+               BuildableName = "EncryptingOutputStream.framework"
+               BlueprintName = "EncryptingOutputStream"
+               ReferencedContainer = "container:EncryptingOutputStream.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AB0EF86D157BDDD200370583"
+               BuildableName = "EncryptingOutputStreamTests.octest"
+               BlueprintName = "EncryptingOutputStreamTests"
+               ReferencedContainer = "container:EncryptingOutputStream.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      allowLocationSimulation = "YES">
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Chapter5/EncryptingOutputStream/EncryptingOutputStream.xcodeproj/xcuserdata/jdovey.xcuserdatad/xcschemes/xcschememanagement.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>EncryptingOutputStream.xcscheme</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+	<key>SuppressBuildableAutocreation</key>
+	<dict>
+		<key>AB0EF855157BDDD200370583</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+		<key>AB0EF86D157BDDD200370583</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+	</dict>
+</dict>
+</plist>

Chapter5/EncryptingOutputStream/EncryptingOutputStream/EncryptingOutputStream-Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>com.apress.BeginningObjectiveC.${PRODUCT_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2012 Apress. All rights reserved.</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

Chapter5/EncryptingOutputStream/EncryptingOutputStream/EncryptingOutputStream-Prefix.pch

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+//
+// Prefix header for all source files of the 'EncryptingOutputStream' target in the 'EncryptingOutputStream' project
+//
+
+#ifdef __OBJC__
+    #import <Cocoa/Cocoa.h>
+#endif

Chapter5/EncryptingOutputStream/EncryptingOutputStream/EncryptingOutputStream.h

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+//
+//  EncryptingOutputStream.h
+//  EncryptingOutputStream
+//
+//  Created by Jim Dovey on 12-06-03.
+//  Copyright (c) 2012 Apress. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface EncryptingOutputStream : NSOutputStream
+- (id) initWithFileURL: (NSURL *) fileURL passPhrase: (NSString *) passPhrase;
+@end

Chapter5/EncryptingOutputStream/EncryptingOutputStream/EncryptingOutputStream.m

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+//
+//  EncryptingOutputStream.m
+//  EncryptingOutputStream
+//
+//  Created by Jim Dovey on 12-06-03.
+//  Copyright (c) 2012 Apress. All rights reserved.
+//
+
+#import "EncryptingOutputStream.h"
+#import "SimpleRunLoopSource.h"
+#import <CommonCrypto/CommonCryptor.h>
+
+@implementation EncryptingOutputStream
+{
+    CCCryptorRef            _cryptor;
+    NSFileHandle *          _output;
+    SimpleRunLoopSource *   _source;
+    id<NSStreamDelegate>    _delegate __weak;
+    NSStreamEvent           _currentEvent;
+    NSStreamStatus          _status;
+    NSError *               _error;
+}
+
+- (id) initWithFileURL: (NSURL *) fileURL passPhrase: (NSString *) passPhrase
+{
+    NSParameterAssert([fileURL isFileURL]);
+    NSParameterAssert([passPhrase length] != 0);
+
+    self = [super init];
+    if ( self == nil )
+        return ( nil );
+
+    // get the password as data, padded/truncated to the AES256 key size
+    NSMutableData * passData = [[passPhrase dataUsingEncoding: NSUTF8StringEncoding] mutableCopy];
+    [passData setLength: kCCKeySizeAES256];
+
+    if ( CCCryptorCreate(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
+                         [passData bytes], [passData length], NULL, &_cryptor) != kCCSuccess )
+    {
+        return ( nil );
+    }
+
+    // NSFileHandle can't open a file that isn't there. Ensure the destination exists.
+    if ( [[NSFileManager defaultManager] fileExistsAtPath: [fileURL path]] == NO )
+        [[NSData data] writeToURL: fileURL options: 0 error: NULL];
+
+    // open the output file
+    _output = [NSFileHandle fileHandleForWritingToURL: fileURL error: NULL];
+
+    // create the runloop source, with a simple handler
+    _source = [[SimpleRunLoopSource alloc] initWithSourceHandler: ^{
+        if ( _currentEvent == NSStreamEventOpenCompleted )
+            _status = NSStreamStatusOpen;
+
+        [_delegate stream: self handleEvent: _currentEvent];
+
+        // always signal space-available for NSFileHandle-based streams, since NSFileHandles can always be written to
+        _currentEvent = NSStreamEventHasSpaceAvailable;
+        [_source signal];
+    }];
+
+    // the initial status of the stream
+    _status = NSStreamStatusNotOpen;
+
+    return ( self );
+}
+
+- (void) dealloc
+{
+    if ( _cryptor != NULL )
+        CCCryptorRelease(_cryptor);
+}
+
+- (void) open
+{
+    _status = NSStreamStatusOpening;
+    _currentEvent = NSStreamEventOpenCompleted;
+    [_source signal];
+}
+
+- (NSInteger) write: (const uint8_t *) buffer maxLength: (NSUInteger) len
+{
+    // update our status to indicate we're in the middle of a write operation
+    _status = NSStreamStatusWriting;
+
+    // encrypt the data
+    NSMutableData * encrypted = [[NSMutableData alloc] initWithLength: len];
+    size_t numWritten = 0;
+    CCCryptorStatus status = CCCryptorUpdate(_cryptor, buffer, len, [encrypted mutableBytes], len, &numWritten);
+    if ( status != kCCSuccess )
+    {
+        // an error occurred-- note it, signal the condition, and return -1
+        _error = [NSError errorWithDomain: @"CoreCryptoErrorDomain" code: status userInfo: nil];
+        _status = NSStreamStatusError;
+        _currentEvent = NSStreamEventErrorOccurred;
+        [_source signal];       // tell the delegate about it
+        return ( -1 );
+    }
+
+    // write this data out via the superclass
+    [_output writeData: encrypted];
+
+    // reset our status and return the length of the data we wrote (we wrote all of it)
+    _status = NSStreamStatusOpen;
+    return ( len );
+}
+
+- (void) close
+{
+    // write any final data first
+    NSMutableData * final = [[NSMutableData alloc] initWithLength: kCCBlockSizeAES128];
+    size_t numWritten = 0;
+    if ( CCCryptorFinal(_cryptor, [final mutableBytes], [final length], &numWritten) == kCCSuccess && numWritten != 0 )
+        [_output writeData: final];
+
+    // flush any filesystem buffers to the disk and close the file
+    [_output synchronizeFile];
+    [_output closeFile];
+
+    // update our status
+    _status = NSStreamStatusClosed;
+}
+
+- (void) setDelegate: (id<NSStreamDelegate>) delegate
+{
+    _delegate = delegate;
+}
+
+- (id<NSStreamDelegate>) delegate
+{
+    return ( _delegate );
+}
+
+- (void) scheduleInRunLoop: (NSRunLoop *) aRunLoop forMode: (NSString *) mode
+{
+    [_source addToRunLoop: aRunLoop forMode: mode];
+}
+
+- (void) removeFromRunLoop: (NSRunLoop *) aRunLoop forMode: (NSString *) mode
+{
+    [_source removeFromRunLoop: aRunLoop forMode: mode];
+}
+
+- (NSStreamStatus) streamStatus
+{
+    return ( _status );
+}
+
+- (NSError *) streamError
+{
+    return ( _error );
+}
+
+@end

Chapter5/EncryptingOutputStream/EncryptingOutputStream/SimpleRunLoopSource.h

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+//
+//  SimpleRunLoopSource.h
+//  EncryptingOutputStream
+//
+//  Created by Jim Dovey on 12-06-03.
+//  Copyright (c) 2012 Apress. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface SimpleRunLoopSource : NSObject
+
+- (id) initWithSourceHandler: (void (^)(void)) handler;
+
+- (void) signal;
+- (void) invalidate;
+
+- (void) addToRunLoop: (NSRunLoop *) runLoop forMode: (NSString *) mode;
+- (void) removeFromRunLoop: (NSRunLoop *) runLoop forMode: (NSString *) mode;
+
+@end