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extendedSalt = [OFSecureData
dataWithCount: param.saltLength + 4
allowsSwappableMemory: param.allowsSwappableMemory];
extendedSaltItems = extendedSalt.mutableItems;
@try {
uint32_t i = OF_BSWAP32_IF_LE(1);
[param.HMAC setKey: param.password
length: param.passwordLength];
memcpy(extendedSaltItems, param.salt, param.saltLength);
while (param.keyLength > 0) {
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extendedSalt = [OFSecureData
dataWithCount: param.saltLength + 4
allowsSwappableMemory: param.allowsSwappableMemory];
extendedSaltItems = extendedSalt.mutableItems;
@try {
uint32_t i = OFToBigEndian32(1);
[param.HMAC setKey: param.password
length: param.passwordLength];
memcpy(extendedSaltItems, param.salt, param.saltLength);
while (param.keyLength > 0) {
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if (length > param.keyLength)
length = param.keyLength;
memcpy(param.key, bufferItems, length);
param.key += length;
param.keyLength -= length;
i = OF_BSWAP32_IF_LE(OF_BSWAP32_IF_LE(i) + 1);
}
} @catch (id e) {
[extendedSalt zero];
[buffer zero];
[digest zero];
@throw e;
} @finally {
[param.HMAC zero];
}
objc_autoreleasePoolPop(pool);
}
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if (length > param.keyLength)
length = param.keyLength;
memcpy(param.key, bufferItems, length);
param.key += length;
param.keyLength -= length;
i = OFToBigEndian32(OFFromBigEndian32(i) + 1);
}
} @catch (id e) {
[extendedSalt zero];
[buffer zero];
[digest zero];
@throw e;
} @finally {
[param.HMAC zero];
}
objc_autoreleasePoolPop(pool);
}
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