Hashlib

AS3Crypto

Fork of Henri Torgemane's excellent as3 cryptography library

BlooddyCrypto

ActionScript (AS3) library for processing binary data. This library contains MD5, SHA-1, SHA-2 ( SHA-224 и SHA-256 ), Base64, CRC32 algorithms, JSON encoder & decoder as well as PNG and JPEG encoders.

ASCrypt

Open-source crypto library with a similar API for multiple languages.

Nexuslib

An Actionscript library providing robust reflection, serialization, seeded random number generation, cryptography, networking, and more.