Trait rand::CryptoRng

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pub trait CryptoRng { }

Expand description

A marker trait used to indicate that an RngCore or BlockRngCore -implementation is supposed to be cryptographically secure.

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Cryptographically secure generators, also known as CSPRNGs, should -satisfy an additional properties over other generators: given the first -k bits of an algorithm’s output -sequence, it should not be possible using polynomial-time algorithms to -predict the next bit with probability significantly greater than 50%.

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Some generators may satisfy an additional property, however this is not -required by this trait: if the CSPRNG’s state is revealed, it should not be -computationally-feasible to reconstruct output prior to this. Some other -generators allow backwards-computation and are considered reversible.

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Note that this trait is provided for guidance only and cannot guarantee -suitability for cryptographic applications. In general it should only be -implemented for well-reviewed code implementing well-regarded algorithms.

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Note also that use of a CryptoRng does not protect against other -weaknesses such as seeding from a weak entropy source or leaking state.

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