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// For example, you can get a derived key for e.g. AES-256 (which needs a
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// 32-byte key) by doing:
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// dk := scrypt.Key([]byte("some password"), salt, 16384, 8, 1, 32)
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// dk, err := scrypt.Key([]byte("some password"), salt, 16384, 8, 1, 32)
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// The recommended parameters for interactive logins as of 2009 are N=16384,
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// r=8, p=1. They should be increased as memory latency and CPU parallelism