def sign_channel_config(self, config, to_string=True):
"""This method uses the client instance's current signing identity to
sign over the configuration bytes passed in.
Args:
config: The configuration update in bytes form.
to_string: Whether to convert the result to string
Returns:
config_signature (common_pb2.ConfigSignature):
The signature of the current user of the config bytes.
"""
sign_channel_context = self.tx_context
proto_signature_header = common_pb2.SignatureHeader()
proto_signature_header.creator = sign_channel_context.identity
proto_signature_header.nonce = sign_channel_context.nonce
proto_signature_header_bytes = \
proto_signature_header.SerializeToString()
signing_bytes = proto_signature_header_bytes + config
signature_bytes = sign_channel_context.sign(signing_bytes)
proto_config_signature = configtx_pb2.ConfigSignature()
proto_config_signature.signature_header = proto_signature_header_bytes
proto_config_signature.signature = signature_bytes
if to_string:
return proto_config_signature.SerializeToString()
else:
return proto_config_signature
def string_to_signature(string_signatures):
"""Check if signatures are already in protobuf format.
:param string_signatures: An list of protobuf ConfigSignatures either
represented as or serialized as byte strings.
:type string_signatures: list
:returns: List of protobuf ConfigSignatures.
:rtype: list
"""
signatures = []
for signature in string_signatures:
if signature and hasattr(signature, 'header') \
and hasattr(signature, 'signature'):
_logger.debug('_string_to_signature - signature is protobuf')
config_signature = signature
else:
_logger.debug('_string_to_signature - signature is string')
config_signature = configtx_pb2.ConfigSignature()
config_signature.ParseFromString(signature)
signatures.append(config_signature)
return signatures
