51 lines
1.2 KiB
Objective-C
51 lines
1.2 KiB
Objective-C
#import "LegacyPasswordGenerator.h"
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@implementation LegacyPasswordGenerator
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@synthesize length = _length, site = _site, passphrase = _passphrase;
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@synthesize 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)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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