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from ._base import lib, c_void_p, c_size_t, c_char_p, \
create_string_buffer, ERR, OlmError
lib.olm_utility_size.argtypes = []
lib.olm_utility_size.restype = c_size_t
lib.olm_utility.argtypes = [c_void_p]
lib.olm_utility.restype = c_void_p
lib.olm_utility_last_error.argtypes = [c_void_p]
lib.olm_utility_last_error.restype = c_char_p
def utility_errcheck(res, func, args):
if res == ERR:
raise OlmError("%s: %s" % (
func.__name__, lib.olm_utility_last_error(args[0])
))
return res
def utility_function(func, *types):
func.argtypes = (c_void_p,) + types
func.restypes = c_size_t
func.errcheck = utility_errcheck
utility_function(
lib.olm_ed25519_verify,
c_void_p, c_size_t, # key, key_length
c_void_p, c_size_t, # message, message_length
c_void_p, c_size_t, # signature, signature_length
)
class Utility(object):
def __init__(self):
self.buf = create_string_buffer(lib.olm_utility_size())
self.ptr = lib.olm_utility(self.buf)
_utility = None
def ed25519_verify(key, message, signature):
""" Verify an ed25519 signature. Raises an OlmError if verification fails.
Args:
key(bytes): The ed25519 public key used for signing.
message(bytes): The signed message.
signature(bytes): The message signature.
"""
global _utility
if not _utility:
_utility = Utility()
lib.olm_ed25519_verify(_utility.ptr,
key, len(key),
message, len(message),
signature, len(signature))
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