CryptoPassphrase  Documentation

/*
 * Copyright (c) 2016, Jonathan Schleifer <js@heap.zone>
 *
 * https://heap.zone/git/scrypt-pwgen.git
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice is present in all copies.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#import "NewPasswordGenerator.h"

@implementation NewPasswordGenerator
@synthesize length = _length, site = _site, passphrase = _passphrase;
@synthesize output = _output;

+ (instancetype)generator
{
	return [[[self alloc] init] autorelease];
}

- init
{
	self = [super init];

	_length = 16;

	return self;
}

- (void)derivePassword
{
	OFSHA384Hash *siteHash = [OFSHA384Hash cryptoHash];
	[siteHash updateWithBuffer: [_site UTF8String]
			    length: [_site UTF8StringLength]];

	if (_output != NULL) {
		of_explicit_memset(_output, 0, _length);
		[self freeMemory: _output];
	}

	_output = [self allocMemoryWithSize: _length + 1];

	of_scrypt(8, 524288, 2, [siteHash digest],
	    [[siteHash class] digestSize], _passphrase, strlen(_passphrase),
	    _output, _length);

	for (size_t i = 0; i < _length; i++)
		_output[i] =
		    "123456789"
		    "abcdefghijkmnopqrstuvwxyz"
		    "ABCDEFGHJKLMNPQRSTUVWXYZ"
		    "#$%-=?"[_output[i] & 0x3F];
}
@end