def _do_digest(data, func):
"""Return the binary digest of `data` with the given `func`."""
func = FuncReg.get(func)
hash = FuncReg.hash_from_func(func)
if not hash:
raise ValueError("no available hash function for hash", func)
hash.update(data)
return bytes(hash.digest())
def _do_digest(data, func):
"""Return the binary digest of `data` with the given `func`."""
func = FuncReg.get(func)
hash = FuncReg.hash_from_func(func)
if not hash:
raise ValueError("no available hash function for hash", func)
hash.update(data)
return bytes(hash.digest())
def __new__(cls, func, digest):
try:
func = FuncReg.get(func)
except KeyError:
if _is_app_specific_func(func):
# Application-specific function codes
# are allowed even if not registered.
func = int(func)
else:
raise
digest = bytes(digest)
return super(cls, Multihash).__new__(cls, func, digest)
def __new__(cls, func, digest):
try:
func = FuncReg.get(func)
except KeyError:
if _is_app_specific_func(func):
# Application-specific function codes
# are allowed even if not registered.
func = int(func)
else:
raise
digest = bytes(digest)
return super(cls, Multihash).__new__(cls, func, digest)
def from_hash(self, hash):
"""Create a `Multihash` from a hashlib-compatible `hash` object.
>>> import hashlib
>>> data = b'foo'
>>> hash = hashlib.sha1(data)
>>> digest = hash.digest()
>>> mh = Multihash.from_hash(hash)
>>> mh == (Func.sha1, digest)
True
Application-specific hash functions are also supported (see
`FuncReg`).
If there is no matching multihash hash function for the given `hash`,
a `ValueError` is raised.
"""
try:
func = FuncReg.func_from_hash(hash)
except KeyError as ke:
raise ValueError(
"no matching multihash function", hash.name) from ke
digest = hash.digest()
return Multihash(func, digest)
def from_hash(self, hash):
"""Create a `Multihash` from a hashlib-compatible `hash` object.
>>> import hashlib
>>> data = b'foo'
>>> hash = hashlib.sha1(data)
>>> digest = hash.digest()
>>> mh = Multihash.from_hash(hash)
>>> mh == (Func.sha1, digest)
True
Application-specific hash functions are also supported (see
`FuncReg`).
If there is no matching multihash hash function for the given `hash`,
a `ValueError` is raised.
"""
try:
func = FuncReg.func_from_hash(hash)
except KeyError as ke:
raise ValueError(
"no matching multihash function", hash.name) from ke
digest = hash.digest()
return Multihash(func, digest)