Permalink
Fetching contributors…
Cannot retrieve contributors at this time
36 lines (32 sloc) 1.27 KB
# Copyright 2016, Cossack Labs Limited
#
# 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.
require 'rubythemis'
SYMMETRIC_KEY_LENGTH = 32
BEGIN_TAG = '""""""""'.b
def create_acrastruct(data, acra_public_key, context=nil)
if data.nil? or data == ''
return data
end
generator = Themis::SKeyPairGen.new
private, public = generator.ec
smessage = Themis::Smessage.new(private.to_s, acra_public_key.to_s)
private.clear
random_key = Random.new.bytes(SYMMETRIC_KEY_LENGTH)
wrapped_random_key = smessage.wrap(random_key.to_s)
scell = Themis::Scell.new(random_key.to_s, Themis::Scell::SEAL_MODE)
random_key.clear
encrypted_data = scell.encrypt(data, context)
data_length = Array(encrypted_data.length).pack('Q<')
BEGIN_TAG + public + wrapped_random_key + data_length + encrypted_data
end