There are 2 repositories under ecdh topic.
PHP Secure Communications Library
Practical Cryptography for Developers: Hashes, MAC, Key Derivation, DHKE, Symmetric and Asymmetric Ciphers, Public Key Cryptosystems, RSA, Elliptic Curves, ECC, secp256k1, ECDH, ECIES, Digital Signatures, ECDSA, EdDSA
Open-source implementation of a substantial portion of the API of Apple CryptoKit suitable for use on Linux platforms.
pure-python ECDSA signature/verification and ECDH key agreement
Fastest JS implementation of secp256k1. Independently audited, high-security, 0-dependency ECDSA & Schnorr signatures.
SM2/SM3/SM4/ECDH library based on OpenSSL.
Library for elliptic curves cryptography
Small portable Elliptic-Curve Diffie-Hellman in C
Ed25519 signing, verification and encryption, decryption for arbitary files; like OpenBSD signifiy but with more functionality and written in Golang - only easier and simpler
Elliptic Curve operations, Schnorr, and ZKP for Bitcoin. Supports iOS macOS tvOS watchOS + Linux.
Elliptic Curve Cryptography playground/toolkit written in pure Python
A lightweight, encrypted, WAN oriented, software defined network device.
Tests support and behavior of elliptic curve cryptography implementations on JavaCards (TYPE_EC_FP and TYPE_EC_F2M) and in selected software libraries.
a native library implementing secp256k1 purely for the crystal language.
VESvault End-to-End Encryption API: Encrypt Everything Without Fear of Losing the Key
An easy-to-use XChaCha20-encryption wrapper for io.ReadWriteCloser (even lossy UDP) using ECDH key exchange algorithm, ED25519 signatures and Blake3+Poly1305 checksums/message-authentication for Go (golang). Also a multiplexer.
Bindings to lib-secp256k1 for golang
PoC of a UEFI Petya ransomware
Bitcoin address key pairs for encrypted messaging
iOS Framework for end-to-end encrypted messages
Microchip AVR based smartcard/token with ECC and RSA cryptography
Pure Rust implementation of HPKE (https://www.rfc-editor.org/rfc/rfc9180.html)
Secure communication between Arduino Uno microcontroller and Android application over BLE (Bluetooth Low Energy).
Crypto Forum Research Group's draft HPKE: Hybrid Public Key Encryption in Go
Solutions to https://cryptopals.com problems
Demo implementation for share key negotiation between openssl and java bouncycastle (ECDH secp256k1)
Java library for Elliptic Curve Cryptography
Reversed source code of the Babuk Ransomware Version 1
Tiny utility library for asymetric encryption via WebCrypto with zero dependencies.
Elliptic Curve Diffie Hellman Key Exchange over HTTP on iOS
Web service to generate decryption key from NotPetyaAgain ransomware