You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: DDKeychain.m
    path of file: ./repos/macSVG/CocoaHTTPServer-master/Samples/SecureWebSocketServer/SecureWebSocketServer
    
    the code of the file until where you have to start completion: #import "DDKeychain.h"


@implementation DDKeychain

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#pragma mark Server:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

/**
 * Retrieves the password stored in the keychain for the HTTP server.
**/
+ (NSString *)passwordForHTTPServer
{
	NSString *password = nil;
	
	const char *service = [@"HTTP Server" UTF8String];
	const char *account = [@"Deusty" UTF8String];
	
	UInt32 passwordLength = 0;
	void *passwordBytes = nil;
	
	OSStatus status;
	status = SecKeychainFindGenericPassword(NULL,            // default keychain
	                                (UInt32)strlen(service), // length of service name
	                                        service,         // service name
	                                (UInt32)strlen(account), // length of account name
	                                        account,         // account name
	                                        &passwordLength, // length of password
	                                        &passwordBytes,  // pointer to password data
	                                        NULL);           // keychain item reference (NULL if unneeded)
	
	if(status == noErr)
	{
		NSData *passwordData = [NSData dataWithBytesNoCopy:passwordBytes length:passwordLength freeWhenDone:NO];
		password = [[NSString alloc] initWithData:passwordData encoding:NSUTF8StringEncoding];
	}
	
	// SecKeychainItemFreeContent(attrList, data)
	// attrList - previously returned attributes
	// data - previously returned password
	
	if(passwordBytes) SecKeychainItemFreeContent(NULL, passwordBytes);
	
	return password;
}


/**
 * This method sets the password for the HTTP server.
**/
+ (BOOL)setPasswordForHTTPServer:(NSString *)password
{
	const char *service = [@"HTTP Server" UTF8String];
	const char *account = [@"Deusty" UTF8String];
	const char *kind    = [@"Deusty password" UTF8String];
	const char *passwd  = [password UTF8String];
	
	SecKeychainItemRef itemRef = NULL;
	
	// The first thing we need to do is check to see a password for the library already exists in the keychain
	OSStatus status;
	status = SecKeychainFindGenericPassword(NULL,            // default keychain
	                                (UInt32)strlen(service), // length of service name
	                                        service,         // service name
	                                (UInt32)strlen(account), // length of account name
	                                        account,         // account name
	                                        NULL,            // length of password (NULL if unneeded)
	                                        NULL,            // pointer to password data (NULL if unneeded)
	                                        &itemRef);       // the keychain item reference
	
	if(status == errSecItemNotFound)
	{
		// Setup the attributes the for the keychain item
		SecKeychainAttribute attrs[] = {
			{ kSecServiceItemAttr,     (UInt32)strlen(service), (char *)service },
			{ kSecAccountItemAttr,     (UInt32)strlen(account), (char *)account },
			{ kSec
    
function has determined the external representation to be in.
	 *     Pass NULL if you donÕt know the format and donÕt want the format returned to you.
	 * SecExternalItemType *itemType
	 *     On input, points to the item type of the item or items contained in the external representation.
	 *     Pass kSecItemTypeUnknown if you do not know the item type.
	 *     On output, points to the item type that the function has determined the external representation to contain.
	 *     Pass NULL if you donÕt know the item type and donÕt want the type returned to you.
	 * SecItemImportExportFlags flags
	 *     Unused; pass in 0.
	 * const SecKeyImportExportParameters *keyParams
	 *     A pointer to a structure containing a set of input parameters for the function.
	 *     If no key items are being imported, these parameters are optional
	 *     and you can set the keyParams parameter to NULL.
	 * SecKeychainRef importKeychain
	 *     A keychain object indicating the keychain to which the key or certificate should be imported.
	 *     If you pass NULL, the item is not imported.
	 *     Use the SecKeychainCopyDefault function to get a reference to the default keychain.
	 *     If the kSecKeyImportOnlyOne bit is set and there is more than one key in the
	 *     incoming external representation, no items are imported to the specified keychain and the
	 *     error errSecMultiplePrivKeys is returned.
	 * CFArrayRef *outItems
	 *     On output, points to an array of SecKeychainItemRef objects for the imported items.
	 *     You must provide a valid pointer to a CFArrayRef object to receive this information.
	 *     If you pass NULL for this parameter, the function does not return the imported items.
	 *     Release this object by calling the CFRelease function when you no longer need it.
	**/
	
	SecExternalFormat inputFormat = kSecFormatPKCS12;
	SecExternalItemType itemType = kSecItemTypeUnknown;
	
	SecKeychainCopyDefault(&keychain);
	
	OSStatus err = 0;
	err = SecKeychainItemImport((__bridge CFDataRef)certData,  // CFDataRef importedData
								NULL,                          // CFStringRef fileNameOrExtension
								&inputFormat,                  // SecExternalFormat *inputFormat
								&itemType,                     // SecExternalItemType *itemType
								0,                             // SecItemImportExportFlags flags (Unused)
								&importParameters,             // const SecKeyImportExportParameters *keyParams
								keychain,                      // SecKeychainRef importKeychain
								&outItems);                    // CFArrayRef *outItems
	
	NSLog(@"OSStatus: %i", err);
	
	NSLog(@"SecExternalFormat: %@", [DDKeychain stringForSecExternalFormat:inputFormat]);
	NSLog(@"SecExternalItemType: %@", [DDKeychain stringForSecExternalItemType:itemType]);
	
	NSLog(@"outItems: %@", (__bridge NSArray *)outItems);
	
	// Don't forget to delete the temporary files
	[[NSFileManager defaultManager] removeItemAtPath:privateKeyPath  error:nil];
	[[NSFileManager defaultManager] removeItemAtPath:reqConfPath     error:nil];
	[[NSFileManager defaultManager] removeItemAtPath:certificatePath error:nil];
	[[NSFileManager defaultManager] removeItemAtPath:certWrapperPath error:nil];
	
	// Don't forget to release anything we may have created
	if(keychain)   CFRelease(keychain);
	if(outItems)   CFRelease(outItems);
}

/**
 * Returns an array of SecCertificateRefs except for the first element in the array, which is a SecIdentityRef.
 * Currently this method is designed to return the identity created in the method above.
 * You will most likely alter this method to return a proper identity based on what it is you're trying to do.
**/
+ (NSArray *)SSLIdentityAndCertificates
{
	// Declare any Carbon variables we may create
	// We do this here so it's easier to compare to the bottom of this method where we release them all
	SecKeychainRef keychain = NULL;
	SecIdentitySearchRef searchRef = NULL;
	
	// Create array to hold the results
	NSMutableArray *result = [NSMutableArray array];
	
	/* SecKeychainAttribute - typedef struct
	 * Contains keychain attributes.
	 *
	 * struct SecKeychainAttribute
	 * {
	 *   SecKeychainAttrType tag;
	 *   UInt32 length;
	 *   void *data;
	 * };
	 *
	 * Fields:
	 * tag
	 *     A 4-byte attribute tag. See ÒKeychain Item Attribute ConstantsÓ for valid attribute types.
	 * length
	 *     The length of the buffer pointed to by data.
	 * data
	 *     A pointer to the attribute data.
	**/

	/* SecKeychainAttributeList - typedef struct
	 * Represents a list of keychain attributes.
	 * 
	 * struct SecKeychainAttributeList
	 * {
	 *   UInt32 count;
	 *   SecKeychainAttribute *attr;
	 * };
	 *
	 * Fields:
	 * count
	 *     An unsigned 32-bit integer that represents the number of keychain attributes in the array.
	 * attr
	 *     A pointer to the first keychain attribute in the array.
	**/
	
	SecKeychainCopyDefault(&keychain);
	
	SecIdentitySearchCreate(keychain, CSSM_KEYUSE_ANY, &searchRef);
	
	SecIdentityRef currentIdentityRef = NULL;
	while(searchRef && (SecIdentitySearchCopyNext(searchRef, &currentIdentityRef) != errSecItemNotFound))
	{
		// Extract the private key from the identity, and examine it to see if it will work for us
		SecKeyRef privateKeyRef = NULL;
		SecIdentityCopyPrivateKey(currentIdentityRef, &privateKeyRef);
		
		if(privateKeyRef)
		{
			// Get the name attribute of the private key
			// We're looking for a private key with the name of "Mojo User"
			
			SecItemAttr itemAttributes[] = {kSecKeyPrintName};
			
			SecExternalFormat externalFormats[] = {kSecFormatUnknown};
			
			int itemAttributesSize  = sizeof(itemAttributes) / sizeof(*itemAttributes);
			int externalFormatsSize = sizeof(externalFormats) / sizeof(*externalFormats);
			NSAssert(itemAttributesSize == externalFormatsSize, @"Arrays must have identical counts!");
			
			SecKeychainAttributeInfo info = {itemAttributesSize, (void *)&itemAttributes, (void *)&externalFormats};
			
			SecKeychainAttributeList *privateKeyAttributeList = NULL;
			SecKeychainItemCopyAttributesAndData((SecKeychainItemRef)privateKeyRef,
			                                     &info, NULL, &privateKeyAttributeList, NULL, NULL);
			
			if(privateKeyAttributeList)
			{
				SecKeychainAttribute nameAttribute = privateKeyAttributeList->attr[0];
				
				NSString *name = [[NSString alloc] initWithBytes:nameAttribute.data
														   length:(nameAttribute.length)
														 encoding:NSUTF8StringEncoding];
				
				// Ugly Hack
				// For some reason, name sometimes contains odd characters at the end