96 lines
2.9 KiB
Objective-C
96 lines
2.9 KiB
Objective-C
/*
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* Copyright (c) 2016 - 2024 Jonathan Schleifer <js@nil.im>
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*
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* https://git.nil.im/js/CryptoPassphrase
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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 appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#import "NewPasswordGenerator.h"
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@implementation NewPasswordGenerator
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@synthesize length = _length, site = _site, keyFile = _keyFile;
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@synthesize 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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- (instancetype)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)derivePassword
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{
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OFSHA384Hash *siteHash = [OFSHA384Hash
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hashWithAllowsSwappableMemory: true];
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size_t passphraseLength, combinedPassphraseLength;
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OFSecureData *combinedPassphrase;
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char *combinedPassphraseItems;
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unsigned char *outputItems;
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[siteHash updateWithBuffer: _site.UTF8String
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length: _site.UTF8StringLength];
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[siteHash calculate];
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[_output release];
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_output = nil;
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_output = [[OFSecureData alloc] initWithCount: _length + 1
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allowsSwappableMemory: true];
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passphraseLength = combinedPassphraseLength = _passphrase.count - 1;
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if (_keyFile != nil) {
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if (SIZE_MAX - combinedPassphraseLength < _keyFile.count)
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@throw [OFOutOfRangeException exception];
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combinedPassphraseLength += _keyFile.count;
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}
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combinedPassphrase = [OFSecureData
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dataWithCount: combinedPassphraseLength
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allowsSwappableMemory: true];
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combinedPassphraseItems = combinedPassphrase.mutableItems;
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memcpy(combinedPassphraseItems, _passphrase.items, passphraseLength);
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if (_keyFile != nil)
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memcpy(combinedPassphraseItems + passphraseLength,
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_keyFile.items, _keyFile.count);
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outputItems = _output.mutableItems;
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OFScrypt((OFScryptParameters){
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.blockSize = 8,
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.costFactor = 524288,
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.parallelization = 2,
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.salt = siteHash.digest,
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.saltLength = [siteHash.class digestSize],
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.password = combinedPassphraseItems,
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.passwordLength = combinedPassphraseLength,
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.key = outputItems,
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.keyLength = _length,
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.allowsSwappableMemory = true
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});
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for (size_t i = 0; i < _length; i++)
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outputItems[i] =
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"123456789"
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"abcdefghijkmnopqrstuvwxyz"
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"ABCDEFGHJKLMNPQRSTUVWXYZ"
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"#$%-=?"[outputItems[i] & 0x3F];
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}
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@end
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