ExAws.S3.Crypto.AESGCMCipher.decrypt

You're seeing just the function decrypt, go back to ExAws.S3.Crypto.AESGCMCipher module for more information.
Link to this function

decrypt(key, contents, iv)

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Specs

decrypt(key :: bitstring(), contents :: bitstring(), iv :: bitstring()) ::
  {:ok, unencrypted_result :: binary()} | {:error, reason :: String.t()}

Decrypt the given contents with the supplied key and initialization vector.