Asm.js implementation of WebCrypto API
npm install asmcrypto.jsasmCrypto  
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JavaScript implementation of popular cryptographic utilities with performance in mind.
Build & Test
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Then download and build the stuff:
git clone https://github.com/asmcrypto/asmcrypto.js.git
cd asmcrypto.js/
npm install
Running tests is always a good idea:
npm test
Congratulations! Now you have your asmcrypto.js ready to use ☺
Support
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* NodeJS 10
* IE11
* last two Chrome versions
* last two Firefox versions and the latest Firefox ESR
* last two Edge versions
* last two Safari versions
AsmCrypto 2.0
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* Moved to TypeScript
* I have no confident knowledge on random generation, so I don't feel right maintaining it. As of 2.0 all custom random generation and seeding code is removed, the underlying browsers and environments have to provide secure random.