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Author image Felipe Gasper
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Crypt::Perl - Cryptography in pure Perl


Just as it sounds: cryptography with no non-core XS dependencies! This is useful if you don’t have access to other tools that do this work like OpenSSL, CryptX, etc. Of course, if you do have access to one of those tools, they may suit your purpose better.

See submodules for usage examples of:



Given the number of original tests in this distribution, I am reasonably confident that this code is as secure as the random number generation in Bytes::Random::Secure::Tiny can allow. The tests verify the logic here against OpenSSL, on which millions of applications rely every day.

That said: NO GUARANTEES!!! The tests here are original, but the production logic is ported from elsewhere. There has been no formal security review. I found at least one security flaw in one of the source libraries; there may be more.

Of course, OpenSSL has not been trouble-free, either!

Caveat emptor.


RSA key generation is slow—too slow, probably, unless you have Math::BigInt::GMP or Math::BigInt::Pari (either of which requires XS). It’s one application where pure-Perl cryptography just doesn’t seem feasible. :-( Everything else, though, including all ECDSA and Ed25519 operations, should be fine.

Note that this distribution’s test suite is pretty slow without an XS backend.


There are TODO items listed in the submodules; the following are general to the entire distribution.

  • Document the exception system so that applications can use it.

  • Add more tests, e.g., against CryptX.

  • Some formal security audit would be nice.

  • Make it faster :)


Much of the logic here comes from Kenji Urushima’s jsrsasign.

Most of the tests depend on the near-ubiquitous OpenSSL, without which the Internet would be a very, very different reality from what we know!

The Ed25519 logic is ported from forge.js.

Other parts are ported from LibTomCrypt.


This library is licensed under the same license as Perl.


Felipe Gasper (FELIPE)