net_instaweb::HashedNonceGenerator Class Reference

#include "hashed_nonce_generator.h"

Inheritance diagram for net_instaweb::HashedNonceGenerator:

Public Member Functions
	HashedNonceGenerator (const Hasher *hasher, StringPiece key, AbstractMutex *mutex)
Public Member Functions inherited from net_instaweb::NonceGenerator
uint64	NewNonce ()
	Generate a fresh, ideally cryptographic, nonce. Thread-safe.

Protected Member Functions
virtual uint64	NewNonceImpl ()
	Subclasses must implement this method. Locking is already handled.
Protected Member Functions inherited from net_instaweb::NonceGenerator
	NonceGenerator (AbstractMutex *mutex)
	Takes ownership of mutex.

Detailed Description

Implements a NonceGenerator using a hasher and a count, starting from an initial secret. See: http://en.wikipedia.org/wiki/Cryptographically_secure_pseudorandom_number_generator Basically we initialize a key and a counter with random data, then return the hash of the string obtained by appending them. Incrementing the counter gives us a new hash. This means that different instantiations of a HashedNonceGenerator must use different keys to avoid repetition of nonce values. Note that (according to the above article) this is sufficient for cryptographic nonce generation, but not for generating a cryptographically secure bit stream for use as a one-time pad.

Constructor & Destructor Documentation

net_instaweb::HashedNonceGenerator::HashedNonceGenerator	(	const Hasher *	hasher,
		StringPiece	key,
		AbstractMutex *	mutex
	)

key must be at least 2*hasher->RawHashSizeInBytes() in length. Takes ownership of mutex, but not of hasher.

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The documentation for this class was generated from the following file:

• pagespeed/kernel/util/hashed_nonce_generator.h