Math::Prime::Util::ChaCha - Pure Perl ChaCha20 CSPRNG
A pure Perl implementation of ChaCha20 with a CSPRNG interface.
Takes a binary string as input and seeds the internal CSPRNG.
A method for sieving the CSPRNG with a small value. This will not be secure but can be useful for simulations and emulating the system
With no argument, chooses a random number, seeds and returns the number. With a single integer argument, seeds and returns the number.
Returns a random 32-bit integer.
Returns a random 64-bit integer.
Takes an unsigned number
n as input and returns that many random bytes as a single binary string.
Dana Jacobsen <email@example.com>
Daniel J. Bernstein wrote the ChaCha family of stream ciphers in 2008 as an update to the popular Salsa20 cipher from 2005.
RFC7539: "ChaCha20 and Poly1305 for IETF Protocols" was used to create both the C and Perl implementations. Test vectors from that document are used here as well.
For final optimizations I got ideas from Christopher Madsen's Crypt::Salsa20 for how to best work around some of Perl's aggressive dynamic typing. Our core is still about 20% slower than Salsa20.
Copyright 2017 by Dana Jacobsen <firstname.lastname@example.org>
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.