samp-core 1.2.0

Substrate Account Messaging Protocol -- Python SDK

samp-core

Python implementation of SAMP (Substrate Account Messaging Protocol). Crypto operations use a native Rust extension via PyO3.

Install

pip install samp-core

Usage

import os

from samp import (
    EncryptedRemark, Seed, decode_remark,
    nonce_from_bytes, plaintext_from_bytes, pubkey_from_bytes, sr25519_signing_scalar,
)
from samp.encryption import compute_view_tag, decrypt, encrypt
from samp.wire import ContentType, encode_encrypted, encode_public

sender_seed = Seed.from_bytes(bytes.fromhex("e5be9a5092b81bca" + "00" * 24))
recipient_pub = pubkey_from_bytes(bytes.fromhex("8eaf04151687736" + "0" + "00" * 24))

# Public message
remark = encode_public(recipient_pub, "Hello from Python")

# Encrypted message
nonce = nonce_from_bytes(os.urandom(12))
plaintext = plaintext_from_bytes(b"Private message")
ciphertext = encrypt(plaintext, recipient_pub, nonce, sender_seed)
tag = compute_view_tag(sender_seed, recipient_pub, nonce)
enc_remark = encode_encrypted(ContentType.ENCRYPTED, tag, nonce, ciphertext)

# Decrypt
recipient_seed = Seed.from_bytes(bytes(32))
scalar = sr25519_signing_scalar(recipient_seed)
parsed = decode_remark(enc_remark)
assert isinstance(parsed, EncryptedRemark)
clear = decrypt(parsed.ciphertext, parsed.nonce, scalar)

API

Wire

Function	Description
encode_public	Public message (0x10)
encode_encrypted	Encrypted or thread message (0x11/0x12)
encode_channel_create	Channel creation (0x13)
encode_channel_msg	Channel message (0x14)
encode_group	Group message (0x15)
decode_remark	Parse any SAMP remark → Remark dataclass
encode_thread_content / decode_thread_content	Thread plaintext (refs + body)
encode_channel_content / decode_channel_content	Channel plaintext (refs + body)
decode_group_content	Group plaintext (refs + body)
encode_group_members / decode_group_members	Group member list
channel_ref_from_recipient	Extract channel ref from recipient field

Crypto

Function	Description
encrypt / decrypt	1:1 ECDH + ChaCha20-Poly1305
decrypt_as_sender	Sender self-decryption via sealed_to
encrypt_for_group / decrypt_from_group	Multi-recipient encryption
sr25519_signing_scalar	Derive signing scalar from sr25519 seed
public_from_seed	Derive public key from seed
compute_view_tag / check_view_tag	1-byte recipient filter
unseal_recipient	Recover recipient from sealed_to field
build_capsules / scan_capsules	Group capsule construction and scanning

Types

Remark (dataclass), SampError (exception)

Test

pytest tests/ -v