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#-------------------------------------------------------------------------
# # Copyright (c) Microsoft and contributors. All rights reserved.
#
# 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 'base64'
module Azure
module Core
module Auth
# Utility class to sign strings with HMAC-256 and then encode the
# signed string using Base64.
class Signer
# The access key for the account
attr :access_key
# Initialize the Signer.
#
# @param access_key [String] The access_key encoded in Base64.
def initialize(access_key)
if access_key.nil?
raise ArgumentError, 'Signing key must be provided'
end
@access_key = Base64.decode64(access_key)
end
# Generate an HMAC signature.
#
# @param body [String] The string to sign.
#
# @return [String] a Base64 String signed with HMAC.
def sign(body)
signed = OpenSSL::HMAC.digest('sha256', access_key, body)
Base64.strict_encode64(signed)
end
end
end
end
end
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