Convert a JSON formatted encrypted private key into a raw unencrypted private key (with options for testing against multiple passwords)

eth_json_test.py

import hashlib
from Crypto.Hash import keccak
import codecs
from Crypto.Cipher import AES
from Crypto.Util import Counter

pws = [ "password1", "password2" ]
cipher 	= "0000000000000000000000000000000000000000000000000000000000000001"
salt 	= "0000000000000000000000000000000000000000000000000000000000000001"
iv 		= "00000000000000000000000000000001"
mac 	= "0000000000000000000000000000000000000000000000000000000000000001"

print("Testing with: "+str(len(pws))+" passwords...")
for pw in pws:
	print("-----")
	print("Password: "+pw)
	dec_key = hashlib.scrypt(bytes(pw, 'utf-8'), salt=bytes.fromhex(salt), n=262144, r=8, p=1, maxmem=2000000000, dklen=32)
	print("Decoded key: "+str(dec_key))

	validate = dec_key[16:] + bytes.fromhex(cipher)
	keccak_hash=keccak.new(digest_bits=256)
	keccak_hash.update(validate)
	print("Computed Mac: "+keccak_hash.hexdigest())
	print("         Mac: "+mac)

	if keccak_hash.hexdigest() == mac:
		iv_int=int(iv, 16)
		ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
		dec_suite = AES.new(dec_key[:16], AES.MODE_CTR, counter=ctr)
		plain_key = dec_suite.decrypt(bytes.fromhex(cipher))
		print("Key bytes: "+str(plain_key))
		print("Key encoded: "+codecs.encode(plain_key, "hex").decode("ascii"))
	else:
		print("Computed mac is not the same as the given mac. The password or ciphertext are likely incorrectly entered.")