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/**
* A javascript implementation of a cryptographically-secure
* Pseudo Random Number Generator (PRNG). The Fortuna algorithm is followed
* here though the use of SHA-256 is not enforced; when generating an
* a PRNG context, the hashing algorithm and block cipher used for
* the generator are specified via a plugin.
*
* @author Dave Longley
*
* Copyright (c) 2010-2014 Digital Bazaar, Inc.
*/
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