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- import hashlib
- import hmac
- from typing import (
- Union,
- )
- import unicodedata
- from eth_keys import (
- keys,
- )
- from eth_utils import (
- ValidationError,
- )
- from hexbytes import (
- HexBytes,
- )
- PBKDF2_ROUNDS = 2048
- SECP256K1_N = int(
- "FFFFFFFF_FFFFFFFF_FFFFFFFF_FFFFFFFE_BAAEDCE6_AF48A03B_BFD25E8C_D0364141", 16
- )
- def unicode_decompose_string(txt: Union[str, bytes]) -> str:
- if isinstance(txt, bytes):
- utxt = txt.decode("utf8")
- elif isinstance(txt, str):
- utxt = txt
- else:
- raise ValidationError("String value expected")
- return unicodedata.normalize("NFKD", utxt)
- def unicode_compose_string(txt: Union[str, bytes]) -> str:
- if isinstance(txt, bytes):
- utxt = txt.decode("utf8")
- elif isinstance(txt, str):
- utxt = txt
- else:
- raise ValidationError("String value expected")
- return unicodedata.normalize("NFKC", utxt)
- def sha256(data: bytes) -> bytes:
- return hashlib.sha256(data).digest()
- def hmac_sha512(chain_code: bytes, data: bytes) -> bytes:
- """
- As specified by RFC4231 - https://tools.ietf.org/html/rfc4231 .
- """
- return hmac.new(chain_code, data, hashlib.sha512).digest()
- def pbkdf2_hmac_sha512(passcode: str, salt: str) -> bytes:
- return hashlib.pbkdf2_hmac(
- "sha512",
- passcode.encode("utf-8"),
- salt.encode("utf-8"),
- PBKDF2_ROUNDS,
- )
- def ec_point(pkey: bytes) -> bytes:
- """
- Compute `point(p)`, where `point` is ecdsa point multiplication.
- Note: Result is ecdsa public key serialized to compressed form
- """
- return keys.PrivateKey(HexBytes(pkey)).public_key.to_compressed_bytes()
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