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)

v11.1.0 URL: https://unpkg.com/jsrsasign@11.1.0/lib/jsrsasign.js

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eckles

💯 PEM-to-JWK and JWK-to-PEM (and SSH) for ECDSA keys in a lightweight, zero-dependency library focused on perfect universal compatibility.

v1.4.1 URL: https://unpkg.com/eckles@1.4.1/index.js

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zero-dependency JWK-to-PEM PEM-to-JWK ECDSA EC SSH-to-JWK JWK-to-SSH p-256 prime256v1 secp256r1 p-384 secp384r1

jodid25519

jodid25519 - Curve 25519-based cryptography

v1.0.2 URL: https://unpkg.com/jodid25519@1.0.2/index.js

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Curve25519 Ed25519 ECDH EdDSA ECDSA encryption signing

@root/keypairs

Lightweight, Zero-Dependency RSA and EC/ECDSA crypto for Node.js and Browsers

v0.10.3 URL: https://unpkg.com/@root/keypairs@0.10.3/keypairs.js

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ASN.1 DER PEM x509 RSA EC ECDSA asn1

@root/csr

Lightweight, Zero-Dependency CSR (Certificate Signing Request) generator and parser for Node.js and Browsers

v0.8.1 URL: https://unpkg.com/@root/csr@0.8.1/csr.js

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CSR ASN.1 DER PEM x509 RSA EC ECDSA letsencrypt ACME asn1