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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Daniel DeLeo (<dan@kallistec.com>)
# Copyright:: Copyright (c) 2009 Opscode, Inc.
# Copyright:: Copyright (c) 2009 Daniel DeLeo
# License:: Apache License, Version 2.0
#
# 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 'openssl'
require 'singleton'
class Chef
class Digester
include Singleton
def self.checksum_for_file(*args)
instance.checksum_for_file(*args)
end
def validate_checksum(*args)
self.class.validate_checksum(*args)
end
def checksum_for_file(file)
generate_checksum(file)
end
def generate_checksum(file)
checksum_file(file, OpenSSL::Digest::SHA256.new)
end
def self.generate_md5_checksum_for_file(*args)
instance.generate_md5_checksum_for_file(*args)
end
def generate_md5_checksum_for_file(file)
checksum_file(file, OpenSSL::Digest::MD5.new)
end
def generate_md5_checksum(io)
checksum_io(io, OpenSSL::Digest::MD5.new)
end
private
def checksum_file(file, digest)
File.open(file, 'rb') { |f| checksum_io(f, digest) }
end
def checksum_io(io, digest)
while chunk = io.read(1024 * 8)
digest.update(chunk)
end
digest.hexdigest
end
end
end
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