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/*
* Copyright (c) 2016 - 2019 Jonathan Schleifer <js@heap.zone>
* Copyright (c) 2016 - 2020 Jonathan Schleifer <js@nil.im>
*
* https://heap.zone/git/cryptopassphrase.git
* https://nil.im/git/cryptopassphrase.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
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}
- (void)derivePassword
{
OFSHA256Hash *siteHash = [OFSHA256Hash
cryptoHashWithAllowsSwappableMemory: true];
size_t passphraseLength, combinedPassphraseLength;
OFSecureData *combinedPassphrase;
char *combinedPassphrase;
char *combinedPassphraseItems;
unsigned char *outputItems;
[siteHash updateWithBuffer: _site.UTF8String
length: _site.UTF8StringLength];
if (_output != NULL) {
[_output release];
of_explicit_memset(_output, 0, _length);
[self freeMemory: _output];
}
_output = [self allocMemoryWithSize: _length + 1];
passphraseLength = combinedPassphraseLength = strlen(_passphrase);
passphraseLength = combinedPassphraseLength = _passphrase.count - 1;
if (_keyFile != nil) {
if (SIZE_MAX - combinedPassphraseLength < _keyFile.count)
@throw [OFOutOfRangeException exception];
combinedPassphraseLength += _keyFile.count;
}
if ((combinedPassphrase = malloc(combinedPassphraseLength)) == NULL)
combinedPassphrase = [OFSecureData
@throw [OFOutOfMemoryException
exceptionWithRequestedSize: combinedPassphraseLength];
@try {
memcpy(combinedPassphrase, _passphrase, passphraseLength);
if (_keyFile != nil)
memcpy(combinedPassphrase + passphraseLength,
_keyFile.items, _keyFile.count);
of_scrypt(8, 524288, 2, siteHash.digest,
[siteHash.class digestSize], combinedPassphrase,
combinedPassphraseLength, _output, _length, true);
} @finally {
of_explicit_memset(combinedPassphrase, 0,
combinedPassphraseLength);
free(combinedPassphrase);
}
_output[0] = "abcdefghijklmnopqrstuvwxyz"[_output[0] % 26];
_output[1] = "0123456789"[_output[1] % 10];
_output[2] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[_output[2] % 26];
outputItems[0] = "abcdefghijklmnopqrstuvwxyz"[outputItems[0] % 26];
outputItems[1] = "0123456789"[outputItems[1] % 10];
outputItems[2] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[outputItems[2] % 26];
for (size_t i = 3; i < _length; i++)
_output[i] = "abcdefghijklmnopqrstuvwxyz"
outputItems[i] = "abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"[_output[i] % (26 + 26 + 10)];
"0123456789"[outputItems[i] % (26 + 26 + 10)];
}
@end
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