Cryptographic Libraries for JavaScript, Python, C# and Java

Cryptography in JavaScript
- ECDSA, elliptic.js, js-sha3.js
Cryptography libraries in Python
- ECDSA, eth_keys
C# and .NET cryptography
- Bouncy Castle .NET, Nethereum
Java cryptography
- JCA, Bouncy Castle, Web3j
C and C++ cryptography
- Crypto++, OpenSSL bindings, Nettle, libgcrypt

TODO:

OpenSSL - https://en.wikipedia.org/wiki/OpenSSL
LibSodium
Crypto++
Lingcrypt - https://en.wikipedia.org/wiki/Libgcrypt
Bouncy Castle
Nettle - https://git.lysator.liu.se/nettle/nettle
Botan - https://botan.randombit.net
Others...

Summary

JavaScript and Python provide simple cryptography libraries
- Hashes, ECC, ECDSA, AES, and many more
Cryptography is C# is heavy
- Use Bouncy Castle .NET for general crypto
- Or Nethereum for simplified secp256k1
Cryptography in Java is heavy
- JCA and Bouncy Castle are hard to use
- Web3j is simplifies library for secp256k1

...