# Path: pycoind/util/base58.py
# def decode_check(payload):
#     'Returns the base58 decoded value, verifying the checksum.'
#     payload = b58decode(payload, None)
#     if payload and sha256d(payload[:-4])[:4] == payload[-4:]:
#         return payload[:-4]
#     return None
# 
# def encode_check(payload):
#     'Returns the base58 encoding with a 4-byte checksum.'
# 
#     checksum = sha256d(payload)[:4]
#     return b58encode(payload + checksum)
# 
# Path: pycoind/util/hash.py
# def sha256d(data):
#     return sha256(sha256(data))
# 
# Path: pycoind/util/key.py
# def privkey_from_wif(privkey, prefix = chr(0x80)):
#     key = base58.decode_check(privkey)
#     if prefix != key[0]:
#         raise ValueError('wif private key has does not match prefix')
#     if len(key) == 33:
#         if privkey[0] != '5':
#             raise ValueError('uncompressed wif private key does not begin with 5')
#         return key[1:]
#     elif len(key) == 34:
#         if key[-1] != chr(0x01):
#             raise ValueError('compressed wif private key missing compression bit')
#         if privkey[0] not in ('L', 'K'):
#             raise ValueError('uncompressed wif private key does not begin with 5')
#         return key[1:-1]
#     raise ValueError('invalid wif private key')
# 
# def privkey_to_wif(privkey, prefix = chr(0x80)):
#     return base58.encode_check(prefix + privkey)
# 
# def publickey_to_address(publickey, version = chr(0)):
#     return pubkeyhash_to_address(hash160(publickey), version)


import base64
from .base58 import decode_check, encode_check
from .hash import sha256d
from .ecdsa import SECP256k1 as curve
from .ecdsa import ellipticcurve
from .ecdsa.util import randrange, string_to_number, number_to_string
from .key import privkey_from_wif, privkey_to_wif, publickey_to_address
    qr = '\x84\x7c\x20' + chr(missing) + chr(required) + checksum
    for private_key in binary:
        qr += private_key[1]

    return base64.b32encode(qr).strip('=')

def partial_split_qr_decode(qr_code):
    'Decode a partial key-set QR code.'

    # calculate padding that would have been stripped
    padding = (len(qr_code) * 5 - 9 * 8) % 32
    binary = base64.b32decode(qr_code + ('=' * padding))

    # check the header
    if not binary.startswith('\x84\x7c\x20'):
        raise ValueError('invalid header')

    # the missing index for this set
    missing = ord(binary[3])

    required = ord(binary[4])
    checksum = binary[5:9]

    # extract each binary key and recompose the key
    keys = set()
    start = 9
    index = 0
    while start + 32 <= len(binary):
        if index == missing: index += 1
        key = '\x10\x01' + chr(index) + chr(required) + checksum + binary[start:start + 32]

# Path: pycoind/util/base58.py
# def decode_check(payload):
#     'Returns the base58 decoded value, verifying the checksum.'
#     payload = b58decode(payload, None)
#     if payload and sha256d(payload[:-4])[:4] == payload[-4:]:
#         return payload[:-4]
#     return None
# 
# def encode_check(payload):
#     'Returns the base58 encoding with a 4-byte checksum.'
# 
#     checksum = sha256d(payload)[:4]
#     return b58encode(payload + checksum)
# 
# Path: pycoind/util/hash.py
# def sha256d(data):
#     return sha256(sha256(data))
# 
# Path: pycoind/util/key.py
# def privkey_from_wif(privkey, prefix = chr(0x80)):
#     key = base58.decode_check(privkey)
#     if prefix != key[0]:
#         raise ValueError('wif private key has does not match prefix')
#     if len(key) == 33:
#         if privkey[0] != '5':
#             raise ValueError('uncompressed wif private key does not begin with 5')
#         return key[1:]
#     elif len(key) == 34:
#         if key[-1] != chr(0x01):
#             raise ValueError('compressed wif private key missing compression bit')
#         if privkey[0] not in ('L', 'K'):
#             raise ValueError('uncompressed wif private key does not begin with 5')
#         return key[1:-1]
#     raise ValueError('invalid wif private key')
# 
# def privkey_to_wif(privkey, prefix = chr(0x80)):
#     return base58.encode_check(prefix + privkey)
# 
# def publickey_to_address(publickey, version = chr(0)):
#     return pubkeyhash_to_address(hash160(publickey), version)


# Path: pycoind/util/piecewise.py
import base64
from .base58 import decode_check, encode_check
from .hash import sha256d
from .ecdsa import SECP256k1 as curve
from .ecdsa import ellipticcurve
from .ecdsa.util import randrange, string_to_number, number_to_string
from .key import privkey_from_wif, privkey_to_wif, publickey_to_address

    qr = '\x84\x7c\x20' + chr(missing) + chr(required) + checksum
    for private_key in binary:
        qr += private_key[1]

    return base64.b32encode(qr).strip('=')

def partial_split_qr_decode(qr_code):
    'Decode a partial key-set QR code.'

    # calculate padding that would have been stripped
    padding = (len(qr_code) * 5 - 9 * 8) % 32
    binary = base64.b32decode(qr_code + ('=' * padding))

    # check the header
    if not binary.startswith('\x84\x7c\x20'):
        raise ValueError('invalid header')

    # the missing index for this set
    missing = ord(binary[3])

    required = ord(binary[4])
    checksum = binary[5:9]

    # extract each binary key and recompose the key
    keys = set()
    start = 9
    index = 0
    while start + 32 <= len(binary):
        if index == missing: index += 1
        key = '\x10\x01' + chr(index) + chr(required) + checksum + binary[start:start + 32]

        keys.add(encode_check(key))