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ex_aws
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AWS client for Elixir. Currently supports Dynamo, DynamoStreams, EC2, Firehose, Kinesis, KMS, Lambda, RRDS, Route53, S3, SES, SNS, SQS, STS and others.
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lib/ex_aws/auth/signatures.ex
defmodule ExAws.Auth.Signatures do
@moduledoc false
import ExAws.Auth.Utils, only: [hmac_sha256: 2, date: 1, bytes_to_hex: 1]
def generate_signature_v4(service, config, datetime, string_to_sign) do
service
|> signing_key(datetime, config)
|> hmac_sha256(string_to_sign)
|> bytes_to_hex
end
defp signing_key(service, datetime, config) do
["AWS4", config[:secret_access_key]]
|> hmac_sha256(date(datetime))
|> hmac_sha256(config[:region])
|> hmac_sha256(service)
|> hmac_sha256("aws4_request")
end
end