pcaversaccio

# pragma version ^0.3.10
"""
@title P256 Signature Verification Function
@custom:contract-name P256Verifier
@license GNU Affero General Public License v3.0 only
@author pcaversaccio
@notice The `verify` function can be used to natively (currently
        only supported on Polygon Mumbai test network) verify a
        P256 (a.k.a. secp256r1 elliptic curve) signature. For more
        technical details, please refer to EIP-7212:

pcaversaccio

🐍 How to get started with Vyper modules

1. Create a new, clean testing directory test

mkdir test
cd test

2. Set up pyenv

pcaversaccio

-----BEGIN PGP PUBLIC KEY BLOCK-----
Comment: Type:          3,072-bit RSA
Comment: Fingerprint:   063E966C93AB4356492FE0327C3B4B4B7725111F


mQGNBGBUv08BDADTYA0GjLhbKbCezlVAubakXh0jcIbkqZPF1wueSbSgDjlS6+d8
67V6ft4hNXJhpNxqr07LrcbUEDdB7WK8EUA9qsLtVRznR/B8y2HwrFs7jbYAUzl6
lZ6UgzXl2QCeKI3B3foa7aGDeBkm1um3zXlR4+b8d4krO8pZTJepC5T+UF3C81Kb
lV+6s+bSsHPtLHwBh+tJtSFF7hQoU1lhVW0hKVGUUwGfoFuYjWh47fLtiEvvtM2e
EUZ/0v9nMTKg+tuk4nrR7J+ARdDxaqDWLNTwzGvuTAgkjw6I+zrzFmgsAbdFLFKE

pcaversaccio

# pragma version ~=0.4.0rc5
"""
@title `erc4626_fees` Module Reference Implementation
@custom:contract-name erc4626_fees_mock
@license GNU Affero General Public License v3.0 only
@author pcaversaccio
@custom:security I have coded this in ~30mins. It's completely
                 untested code, so please be careful!
"""

pcaversaccio

import hashlib


def base58_encode(data: bytes) -> str:
    alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
    value = int.from_bytes(data, "big")
    result = []

    while value:
        value, remainder = divmod(value, 58)

pcaversaccio

import base58
import hashlib


def eth_to_tron(eth_address):
    eth_address_bytes = bytes.fromhex(
        eth_address[2:] if eth_address.startswith("0x") else eth_address
    )
    tron_address_bytes = b"\x41" + eth_address_bytes
    checksum = hashlib.sha256(hashlib.sha256(tron_address_bytes).digest()).digest()[:4]

pcaversaccio

Reentrancy for Solidity Built-in Functions transfer and send

I only show this here for transfer, but it also applies to send.

// SPDX-License-Identifier: WTFPL
pragma solidity 0.8.29;

contract Victim {
    mapping(address account => uint256 balances) public balances;

pcaversaccio

# pragma version ~=0.4.2
"""
@title `CREATE`, `CREATE2`, and `CREATE3` Utility Functions
@license GNU Affero General Public License v3.0 only
@author pcaversaccio
"""

PROXY_CHILD_BYTECODE: constant(Bytes[16]) = x"67363d3d37363d34f03d5260086018f3"

pcaversaccio

#!/usr/bin/env bash

while [[ "$#" -gt 0 ]]; do
	case $1 in
	--network)
		network="$2"
		shift
		;;
	--address)
		address="$2"

pcaversaccio

# pragma version ~=0.4.1
"""
@title Historical Block Hashes Oracle
@custom:contract-name block_hash_oracle
@license GNU Affero General Public License v3.0 only
@author pcaversaccio
@notice The contract function `block_hash` can be used to access the
        historical block hashes beyond the default 256-block limit.
        We use the EIP-2935 (https://eips.ethereum.org/EIPS/eip-2935)
        history contract, which maintains a ring buffer of the last