Implement Bolt8

[nGoline]

C# implementation of Bolt8.

Using libsodium as a backend for cryptographic functions like:

• crypto_aead_chacha20poly1305_ietf_encrypt
• crypto_aead_chacha20poly1305_ietf_decrypt
• crypto_hash_sha256_init
• crypto_hash_sha256_update
• crypto_hash_sha256_final

Using NBitcoin for secp256k1-related functions like:

• Generation of Private and Public Keys
• Exchange shared secret through ECDH

The following code is tested:

• SHA256 functions
• E2E Handshake and Message Exchange
• Handshake and Transport Services

[jaonoctus]

It seems to be working after the last changes.

You got the tests cases from the spec, right?

[nGoline]

It seems to be working after the last changes.

You got the tests cases from the spec, right?

Yes, and I just added a README file under test/NLightning.Bolts.Tests/BOLT8/IntegrationTests/README.md to clarify things up.