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b76afff274
CMasterKey::nDeriveIterations values are deserialized from wallet files as unsigned 32-bit integers, but key derivation narrowed the count to a signed int. A count above INT_MAX became negative in the conversion, and the derivation loop counter then overflowed, which is undefined behavior. Keep the count unsigned through the derivation path to match the serialized type. Add a unit test for zero and normal counts.