Jonathan Schleifer
914314b927
The scrypt-genpass compatible one is now the legacy algorithm (activated with -L or --legacy).
85 lines
2.5 KiB
Objective-C
85 lines
2.5 KiB
Objective-C
/*
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* Copyright (c) 2016, Jonathan Schleifer <js@heap.zone>
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*
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* https://heap.zone/git/?p=scrypt-pwgen.git
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "LegacyPasswordGenerator.h"
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@implementation LegacyPasswordGenerator
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@synthesize site = _site, passphrase = _passphrase, output = _output;
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+ (instancetype)generator
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{
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return [[[self alloc] init] autorelease];
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}
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- init
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{
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self = [super init];
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_length = 16;
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return self;
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}
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- (void)setLength: (size_t)length
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{
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if (length < 3)
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@throw [OFInvalidArgumentException exception];
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_length = length;
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}
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- (size_t)length
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{
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return _length;
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}
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- (void)derivePassword
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{
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OFSHA256Hash *siteHash = [OFSHA256Hash cryptoHash];
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[siteHash updateWithBuffer: [_site UTF8String]
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length: [_site UTF8StringLength]];
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if (_output != NULL) {
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of_explicit_memset(_output, 0, _length);
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[self freeMemory: _output];
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}
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_output = [self allocMemoryWithSize: _length + 1];
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of_scrypt(8, 524288, 2, [siteHash digest],
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[[siteHash class] digestSize], _passphrase, strlen(_passphrase),
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_output, _length);
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/*
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* This has a bias, however, this is what scrypt-genpass does and the
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* legacy mode wants to be compatible to scrypt-genpass.
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*/
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_output[0] = "abcdefghijklmnopqrstuvwxyz"[_output[0] % 26];
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_output[1] = "0123456789"[_output[1] % 10];
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_output[2] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[_output[2] % 26];
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for (size_t i = 3; i < _length; i++)
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_output[i] = "abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"0123456789"[_output[i] % (26 + 26 + 10)];
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}
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@end
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