from hashlib import new as hashlib_new
from hashlib import sha256 as hashlib_sha256
from hashlib import sha512 as hashlib_sha512
import hmac

bytes_from_hex = bytes.fromhex

def sha256(h, hex=False):
    if isinstance(h, str):
        h = bytes_from_hex(h)
    return hashlib_sha256(h).hexdigest() if hex else hashlib_sha256(h).digest()


def double_sha256(h, hex=False):
    if isinstance(h,str):
        h = bytes_from_hex(h)
    return sha256(sha256(h), True) if hex else sha256(sha256(h))


def hmac_sha512(key, data, hex=False):
    if hex:
        return hmac.new(key, data, hashlib_sha512).hexdigest()
    return hmac.new(key, data, hashlib_sha512).digest()


def ripemd160(h, hex=False):
    if isinstance(h, str):
        h = bytes_from_hex(h)
    a = hashlib_new('ripemd160')
    a.update(h)
    return a.hexdigest() if hex else a.digest()


def hash160(h, hex=False):
    if isinstance(h, str):
        bytes_from_hex(h)
    return ripemd160(sha256(h), True) if hex else ripemd160(sha256(h))