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Support Erlang 24 #29

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8 changes: 7 additions & 1 deletion lib/json_web_token/algorithm/hmac.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ defmodule JsonWebToken.Algorithm.Hmac do
"""
def sign(sha_bits, shared_key, signing_input) do
validate_params(sha_bits, shared_key)
:crypto.hmac(sha_bits, shared_key, signing_input)
hmac(sha_bits, shared_key, signing_input)
end

@doc """
Expand Down Expand Up @@ -48,4 +48,10 @@ defmodule JsonWebToken.Algorithm.Hmac do

defp weak_key(true), do: raise "Key size smaller than the hash output size"
defp weak_key(_), do: :ok

if Code.ensure_loaded?(:crypto) and function_exported?(:crypto, :mac, 4) do
defp hmac(digest, key, payload), do: :crypto.mac(:hmac, digest, key, payload)
else
defp hmac(digest, key, payload), do: :crypto.hmac(digest, key, payload)
end
end