def hash_atoms(cls, atoms: List['Atom'], output: str = 'base17') -> Union[str, None, List]:
"""
:param atoms: List[Atom]
:param output: str default base17
:return: Union[str, None, List]
"""
atom_list = Atom.sort_atoms(atoms)
molecular_sponge = shake()
number_of_atoms = strings.encode(str(len(atom_list)))
for atom in atom_list:
molecular_sponge.update(number_of_atoms)
for prop, value in atom.__dict__.items():
if value is None and prop in ['batchId', 'characters', 'pubkey']:
continue
if prop in ['otsFragment', 'index']:
continue
if prop in ['meta']:
atom.meta = Meta.normalize_meta(value)
for index, meta in enumerate(atom.meta):
if meta['value'] is not None:
atom.meta[index]['value'] = str(meta['value'])
for key in ['key', 'value']:
molecular_sponge.update(strings.encode(meta[key]))
continue
if prop in ['position', 'walletAddress', 'isotope']:
molecular_sponge.update(strings.encode('' if value is None else value))
continue
if value is not None:
molecular_sponge.update(strings.encode(value))
target = None
if output in ['hex']:
target = molecular_sponge.hexdigest(32)
elif output in ['array']:
target = list(molecular_sponge.hexdigest(32))
elif output in ['base17']:
target = strings.charset_base_convert(
molecular_sponge.hexdigest(32), 16, 17, '0123456789abcdef', '0123456789abcdefg'
)
target = target.rjust(64, '0') if isinstance(target, str) else None
return target
def ots(molecule: 'Molecule') -> bool:
"""
This section describes the function DecodeOtsFragments(Om, Hm), which is used to transform a collection
of signature fragments Om and a molecular hash Hm into a single-use wallet address to be matched against
the sender’s address.
:param molecule: Molecule
:return: bool
:raises [MolecularHashMissingException, AtomsMissingException, SignatureMalformedException, SignatureMismatchException]:
"""
missing(molecule)
# Determine first atom
first_atom = molecule.atoms[0]
# Rebuilding OTS out of all the atoms
key = ''.join([atom.otsFragment for atom in molecule.atoms])
# Wrong size? Maybe it's compressed
if 2048 != len(key):
# Attempt decompression
key = strings.base64_to_hex(key)
# Still wrong? That's a failure
if 2048 != len(key):
raise SignatureMalformedException()
key_fragments = molecule.signature_fragments(key, False)
# Absorb the hashed Kk into the sponge to receive the digest Dk
sponge = shake()
sponge.update(strings.encode(key_fragments))
digest = sponge.hexdigest(1024)
# Squeeze the sponge to retrieve a 128 byte (64 character) string that should match the sender’s
# wallet address
sponge = shake()
sponge.update(strings.encode(digest))
address = sponge.hexdigest(32)
if address != first_atom.walletAddress:
raise SignatureMismatchException()
return True
def generate_public_key(cls, key: str) -> str:
"""
:param key: str
:return: str
"""
digest_sponge = shake()
for fragment in strings.chunk_substr(key, 128):
working_fragment = fragment
for _ in range(16):
working_sponge = shake()
working_sponge.update(strings.encode(working_fragment))
working_fragment = working_sponge.hexdigest(64)
digest_sponge.update(strings.encode(working_fragment))
sponge = shake()
sponge.update(strings.encode(digest_sponge.hexdigest(1024)))
return sponge.hexdigest(32)
def signature_fragments(self, key, encode: bool = True):
key_fragments = ''
normalized_hash = self.normalized_hash()
# Subdivide Kk into 16 segments of 256 bytes (128 characters) each
for index, ots_chunk in enumerate(map(''.join, zip(*[iter(key)] * 128))):
working_chunk = ots_chunk
for _ in range(8 + normalized_hash[index] * (-1 if encode else 1)):
sponge = shake()
sponge.update(strings.encode(working_chunk))
working_chunk = sponge.hexdigest(64)
key_fragments = '%s%s' % (key_fragments, working_chunk)
return key_fragments
def generate_private_key(cls, secret: str, token: str, position: str) -> str:
"""
:param secret: str
:param token: str
:param position: str
:return: str
"""
# Converting secret to bigInt
# Adding new position to the user secret to produce the indexed key
indexed_key = '%x' % add(array([int(secret, 16)], dtype='object'),
array([int(position, 16)], dtype='object'))[0]
# Hashing the indexed key to produce the intermediate key
intermediate_key_sponge = shake()
intermediate_key_sponge.update(indexed_key.encode('utf-8'))
if token not in ['']:
intermediate_key_sponge.update(token.encode('utf-8'))
# Hashing the intermediate key to produce the private key
sponge = shake()
sponge.update(strings.encode(intermediate_key_sponge.hexdigest(1024)))
return sponge.hexdigest(1024)