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@synthesize output = _output;
+ (instancetype)generator
{
return [[[self alloc] init] autorelease];
}
- init
- (instancetype)init
{
self = [super init];
_length = 16;
return self;
}
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- (void)derivePassword
{
OFSHA256Hash *siteHash = [OFSHA256Hash cryptoHash];
size_t passphraseLength, combinedPassphraseLength;
char *combinedPassphrase;
[siteHash updateWithBuffer: [_site UTF8String]
length: [_site UTF8StringLength]];
[siteHash updateWithBuffer: _site.UTF8String
length: _site.UTF8StringLength];
if (_output != NULL) {
of_explicit_memset(_output, 0, _length);
[self freeMemory: _output];
}
_output = [self allocMemoryWithSize: _length + 1];
passphraseLength = combinedPassphraseLength = strlen(_passphrase);
if (_keyfile != nil) {
if (SIZE_MAX - combinedPassphraseLength < [_keyfile count])
if (SIZE_MAX - combinedPassphraseLength < _keyfile.count)
@throw [OFOutOfRangeException exception];
combinedPassphraseLength += [_keyfile count];
combinedPassphraseLength += _keyfile.count;
}
if ((combinedPassphrase = malloc(combinedPassphraseLength)) == NULL)
@throw [OFOutOfMemoryException
exceptionWithRequestedSize: combinedPassphraseLength];
@try {
memcpy(combinedPassphrase, _passphrase, passphraseLength);
if (_keyfile != nil)
memcpy(combinedPassphrase + passphraseLength,
[_keyfile items], [_keyfile count]);
_keyfile.items, _keyfile.count);
of_scrypt(8, 524288, 2, [siteHash digest],
[[siteHash class] digestSize], combinedPassphrase,
of_scrypt(8, 524288, 2, siteHash.digest,
[siteHash.class digestSize], combinedPassphrase,
combinedPassphraseLength, _output, _length);
} @finally {
of_explicit_memset(combinedPassphrase, 0,
combinedPassphraseLength);
free(combinedPassphrase);
}
|