The 'jsrsasign' (RSA-Sign JavaScript Library) is an opensource free cryptography library supporting RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, OCSP, CMS SignedData, TimeStamp, CAdES JSON Web Signature/Token in pure JavaScript.

Open-source implementation of a substantial portion of the API of Apple CryptoKit suitable for use on Linux platforms.

📡 An AX.25 packet radio chat protocol with support for digital signatures and binary compression. Like IRC over radio waves.

"JSON Web Almost Everything" - JWA, JWS, JWE, JWK, JWT, JWKS for Node.js with minimal dependencies

Crypt::LE - Let's Encrypt / Buypass / ACME client and library in Perl for obtaining free SSL certificates (inc. generating RSA/ECC keys and CSRs). HTTP/DNS verification is supported out of the box, easily extended with plugins, easily dockerized.

Compiler-free Python crypto library backed by the OS, supporting CPython and PyPy

JSON Web Token library

Windows Secure Shell Client With Support For Smart Cards & Certificates

A simple library to recover the private key of ECDSA and DSA signatures sharing the same nonce k and therefore having identical signature parameter r

PHP library to generate BTC addresses and signatures from private keys.

Python library for fast elliptic curve crypto

Multi-provider digital signature library for Rust

Crypto for Modern Object Pascal

This gem implements the Elliptic Curve Digital Signature Algorithm (ECDSA) almost entirely in pure Ruby.

Pure Java implementation of curve25519, salsa20, hsalsa20, xsalsa20 and poly1305 cryptographic primitives, along with a NaCl "Box" implementation

Cryptographic signature algorithms: ECDSA, Ed25519

Gotham city is a fully functional project to demonstrate real-life example of minimalist Bitcoin decentralized HD wallet using 2 party ECDSA

Pure Rust client for YubiHSM2 devices

Datagram Transport Layer Security (DTLS) client.

A BIP32 compatible library.

Python code to implement various number theory, elliptic curve and finite field computations.

Cryptographic libraries for R6RS Scheme

Noble secp256k1. Fast, high-security, easily auditable, 0-dep, 1-file pubkey & ECDSA signature scheme

Elliptic Curve Cryptography playground/toolkit written in pure Python

Simple registration framework for OS X apps. DSA/ECDSA support. No OpenSSL required.

Algorithms to re-compute a private key, to fake signatures and some other funny things with Bitcoin.

Proof of concept of bitcoin private key recovery using weak ECDSA signatures

Timing Attack on TLS' ECDSA signature