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# File 'lib/acrawriter.rb', line 20
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
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