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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. 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. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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 'base64'
module AWS
module Core
module Signers
# @api private
module Base
# Signs a string using the credentials stored in memory.
# @param [String] secret Usually an AWS secret access key.
# @param [String] string_to_sign The string to sign.
# @param [String] digest_method The digest method to use when
# computing the HMAC digest.
# @return [String] Returns the computed signature.
def sign secret, string_to_sign, digest_method = 'sha256'
Base64.encode64(hmac(secret, string_to_sign, digest_method)).strip
end
module_function :sign
# Computes an HMAC digest of the passed string.
# @param [String] key
# @param [String] value
# @param [String] digest ('sha256')
# @return [String]
def hmac key, value, digest = 'sha256'
OpenSSL::HMAC.digest(OpenSSL::Digest.new(digest), key, value)
end
module_function :hmac
end
end
end
end
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