node-forge
JavaScript implementations of network transports, cryptography, ciphers, PKI, message digests, and various utilities.
jsrsasign
opensource free pure JavaScript cryptographic library supports RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, OCSP, CMS SignedData, TimeStamp and CAdES and JSON Web Signature(JWS)/Token(JWT)/Key(JWK)
kruptein
crypto; from kruptein to hide or conceal