mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-26 06:40:42 +00:00
286 lines
9.4 KiB
Python
286 lines
9.4 KiB
Python
|
# Copyright 2013 Donald Stufft and individual contributors
|
||
|
|
#
|
||
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
# you may not use this file except in compliance with the License.
|
||
|
|
# You may obtain a copy of the License at
|
||
|
|
#
|
||
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
#
|
||
|
|
# Unless required by applicable law or agreed to in writing, software
|
||
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
# See the License for the specific language governing permissions and
|
||
|
|
# limitations under the License.
|
||
|
|
|
||
|
|
from __future__ import absolute_import, division, print_function
|
||
|
|
|
||
|
|
from nacl import exceptions as exc
|
||
|
|
from nacl._sodium import ffi, lib
|
||
|
|
from nacl.exceptions import ensure
|
||
|
|
|
||
|
|
|
||
|
|
crypto_sign_BYTES = lib.crypto_sign_bytes()
|
||
|
|
# crypto_sign_SEEDBYTES = lib.crypto_sign_seedbytes()
|
||
|
|
crypto_sign_SEEDBYTES = lib.crypto_sign_secretkeybytes() // 2
|
||
|
|
crypto_sign_PUBLICKEYBYTES = lib.crypto_sign_publickeybytes()
|
||
|
|
crypto_sign_SECRETKEYBYTES = lib.crypto_sign_secretkeybytes()
|
||
|
|
|
||
|
|
crypto_sign_curve25519_BYTES = lib.crypto_box_secretkeybytes()
|
||
|
|
|
||
|
|
crypto_sign_ed25519ph_STATEBYTES = lib.crypto_sign_ed25519ph_statebytes()
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_keypair():
|
||
|
|
"""
|
||
|
|
Returns a randomly generated public key and secret key.
|
||
|
|
|
||
|
|
:rtype: (bytes(public_key), bytes(secret_key))
|
||
|
|
"""
|
||
|
|
pk = ffi.new("unsigned char[]", crypto_sign_PUBLICKEYBYTES)
|
||
|
|
sk = ffi.new("unsigned char[]", crypto_sign_SECRETKEYBYTES)
|
||
|
|
|
||
|
|
rc = lib.crypto_sign_keypair(pk, sk)
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
return (
|
||
|
|
ffi.buffer(pk, crypto_sign_PUBLICKEYBYTES)[:],
|
||
|
|
ffi.buffer(sk, crypto_sign_SECRETKEYBYTES)[:],
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_seed_keypair(seed):
|
||
|
|
"""
|
||
|
|
Computes and returns the public key and secret key using the seed ``seed``.
|
||
|
|
|
||
|
|
:param seed: bytes
|
||
|
|
:rtype: (bytes(public_key), bytes(secret_key))
|
||
|
|
"""
|
||
|
|
if len(seed) != crypto_sign_SEEDBYTES:
|
||
|
|
raise exc.ValueError("Invalid seed")
|
||
|
|
|
||
|
|
pk = ffi.new("unsigned char[]", crypto_sign_PUBLICKEYBYTES)
|
||
|
|
sk = ffi.new("unsigned char[]", crypto_sign_SECRETKEYBYTES)
|
||
|
|
|
||
|
|
rc = lib.crypto_sign_seed_keypair(pk, sk, seed)
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
return (
|
||
|
|
ffi.buffer(pk, crypto_sign_PUBLICKEYBYTES)[:],
|
||
|
|
ffi.buffer(sk, crypto_sign_SECRETKEYBYTES)[:],
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign(message, sk):
|
||
|
|
"""
|
||
|
|
Signs the message ``message`` using the secret key ``sk`` and returns the
|
||
|
|
signed message.
|
||
|
|
|
||
|
|
:param message: bytes
|
||
|
|
:param sk: bytes
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
signed = ffi.new("unsigned char[]", len(message) + crypto_sign_BYTES)
|
||
|
|
signed_len = ffi.new("unsigned long long *")
|
||
|
|
|
||
|
|
rc = lib.crypto_sign(signed, signed_len, message, len(message), sk)
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
return ffi.buffer(signed, signed_len[0])[:]
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_open(signed, pk):
|
||
|
|
"""
|
||
|
|
Verifies the signature of the signed message ``signed`` using the public
|
||
|
|
key ``pk`` and returns the unsigned message.
|
||
|
|
|
||
|
|
:param signed: bytes
|
||
|
|
:param pk: bytes
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
message = ffi.new("unsigned char[]", len(signed))
|
||
|
|
message_len = ffi.new("unsigned long long *")
|
||
|
|
|
||
|
|
if lib.crypto_sign_open(
|
||
|
|
message, message_len, signed, len(signed), pk) != 0:
|
||
|
|
raise exc.BadSignatureError("Signature was forged or corrupt")
|
||
|
|
|
||
|
|
return ffi.buffer(message, message_len[0])[:]
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_ed25519_pk_to_curve25519(public_key_bytes):
|
||
|
|
"""
|
||
|
|
Converts a public Ed25519 key (encoded as bytes ``public_key_bytes``) to
|
||
|
|
a public Curve25519 key as bytes.
|
||
|
|
|
||
|
|
Raises a ValueError if ``public_key_bytes`` is not of length
|
||
|
|
``crypto_sign_PUBLICKEYBYTES``
|
||
|
|
|
||
|
|
:param public_key_bytes: bytes
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
if len(public_key_bytes) != crypto_sign_PUBLICKEYBYTES:
|
||
|
|
raise exc.ValueError("Invalid curve public key")
|
||
|
|
|
||
|
|
curve_public_key_len = crypto_sign_curve25519_BYTES
|
||
|
|
curve_public_key = ffi.new("unsigned char[]", curve_public_key_len)
|
||
|
|
|
||
|
|
rc = lib.crypto_sign_ed25519_pk_to_curve25519(curve_public_key,
|
||
|
|
public_key_bytes)
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
return ffi.buffer(curve_public_key, curve_public_key_len)[:]
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_ed25519_sk_to_curve25519(secret_key_bytes):
|
||
|
|
"""
|
||
|
|
Converts a secret Ed25519 key (encoded as bytes ``secret_key_bytes``) to
|
||
|
|
a secret Curve25519 key as bytes.
|
||
|
|
|
||
|
|
Raises a ValueError if ``secret_key_bytes``is not of length
|
||
|
|
``crypto_sign_SECRETKEYBYTES``
|
||
|
|
|
||
|
|
:param public_key_bytes: bytes
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
if len(secret_key_bytes) != crypto_sign_SECRETKEYBYTES:
|
||
|
|
raise exc.ValueError("Invalid curve public key")
|
||
|
|
|
||
|
|
curve_secret_key_len = crypto_sign_curve25519_BYTES
|
||
|
|
curve_secret_key = ffi.new("unsigned char[]", curve_secret_key_len)
|
||
|
|
|
||
|
|
rc = lib.crypto_sign_ed25519_sk_to_curve25519(curve_secret_key,
|
||
|
|
secret_key_bytes)
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
return ffi.buffer(curve_secret_key, curve_secret_key_len)[:]
|
||
|
|
|
||
|
|
|
||
|
|
class crypto_sign_ed25519ph_state(object):
|
||
|
|
"""
|
||
|
|
State object wrapping the sha-512 state used in ed25519ph computation
|
||
|
|
"""
|
||
|
|
__slots__ = ['state']
|
||
|
|
|
||
|
|
def __init__(self):
|
||
|
|
self.state = ffi.new('unsigned char[]',
|
||
|
|
crypto_sign_ed25519ph_STATEBYTES)
|
||
|
|
|
||
|
|
rc = lib.crypto_sign_ed25519ph_init(self.state)
|
||
|
|
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_ed25519ph_update(edph, pmsg):
|
||
|
|
"""
|
||
|
|
Update the hash state wrapped in edph
|
||
|
|
|
||
|
|
:param edph: the ed25519ph state being updated
|
||
|
|
:type edph: crypto_sign_ed25519ph_state
|
||
|
|
:param pmsg: the partial message
|
||
|
|
:type pmsg: bytes
|
||
|
|
:rtype: None
|
||
|
|
"""
|
||
|
|
ensure(isinstance(edph, crypto_sign_ed25519ph_state),
|
||
|
|
'edph parameter must be a ed25519ph_state object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(isinstance(pmsg, bytes),
|
||
|
|
'pmsg parameter must be a bytes object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
rc = lib.crypto_sign_ed25519ph_update(edph.state,
|
||
|
|
pmsg,
|
||
|
|
len(pmsg))
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_ed25519ph_final_create(edph,
|
||
|
|
sk):
|
||
|
|
"""
|
||
|
|
Create a signature for the data hashed in edph
|
||
|
|
using the secret key sk
|
||
|
|
|
||
|
|
:param edph: the ed25519ph state for the data
|
||
|
|
being signed
|
||
|
|
:type edph: crypto_sign_ed25519ph_state
|
||
|
|
:param sk: the ed25519 secret part of the signing key
|
||
|
|
:type sk: bytes
|
||
|
|
:return: ed25519ph signature
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
ensure(isinstance(edph, crypto_sign_ed25519ph_state),
|
||
|
|
'edph parameter must be a ed25519ph_state object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(isinstance(sk, bytes),
|
||
|
|
'secret key parameter must be a bytes object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(len(sk) == crypto_sign_SECRETKEYBYTES,
|
||
|
|
('secret key must be {0} '
|
||
|
|
'bytes long').format(crypto_sign_SECRETKEYBYTES),
|
||
|
|
raising=exc.TypeError)
|
||
|
|
signature = ffi.new("unsigned char[]", crypto_sign_BYTES)
|
||
|
|
rc = lib.crypto_sign_ed25519ph_final_create(edph.state,
|
||
|
|
signature,
|
||
|
|
ffi.NULL,
|
||
|
|
sk)
|
||
|
|
ensure(rc == 0,
|
||
|
|
'Unexpected library error',
|
||
|
|
raising=exc.RuntimeError)
|
||
|
|
|
||
|
|
return ffi.buffer(signature, crypto_sign_BYTES)[:]
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_sign_ed25519ph_final_verify(edph,
|
||
|
|
signature,
|
||
|
|
pk):
|
||
|
|
"""
|
||
|
|
Verify a prehashed signature using the public key pk
|
||
|
|
|
||
|
|
:param edph: the ed25519ph state for the data
|
||
|
|
being verified
|
||
|
|
:type edph: crypto_sign_ed25519ph_state
|
||
|
|
:param signature: the signature being verified
|
||
|
|
:type signature: bytes
|
||
|
|
:param pk: the ed25519 public part of the signing key
|
||
|
|
:type pk: bytes
|
||
|
|
:return: True if the signature is valid
|
||
|
|
:rtype: boolean
|
||
|
|
:raises exc.BadSignatureError: if the signature is not valid
|
||
|
|
"""
|
||
|
|
ensure(isinstance(edph, crypto_sign_ed25519ph_state),
|
||
|
|
'edph parameter must be a ed25519ph_state object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(isinstance(signature, bytes),
|
||
|
|
'signature parameter must be a bytes object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(len(signature) == crypto_sign_BYTES,
|
||
|
|
('signature must be {0} '
|
||
|
|
'bytes long').format(crypto_sign_BYTES),
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(isinstance(pk, bytes),
|
||
|
|
'public key parameter must be a bytes object',
|
||
|
|
raising=exc.TypeError)
|
||
|
|
ensure(len(pk) == crypto_sign_PUBLICKEYBYTES,
|
||
|
|
('public key must be {0} '
|
||
|
|
'bytes long').format(crypto_sign_PUBLICKEYBYTES),
|
||
|
|
raising=exc.TypeError)
|
||
|
|
rc = lib.crypto_sign_ed25519ph_final_verify(edph.state,
|
||
|
|
signature,
|
||
|
|
pk)
|
||
|
|
if rc != 0:
|
||
|
|
raise exc.BadSignatureError("Signature was forged or corrupt")
|
||
|
|
|
||
|
|
return True
|