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42 lines
1.1 KiB
Elixir
42 lines
1.1 KiB
Elixir
defmodule PhilomenaMedia.Sha512 do
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@moduledoc """
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Streaming SHA-512 processor.
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"""
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@chunk_size 10_485_760
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@doc """
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Generate the SHA2-512 hash of the file at the given path as a string.
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The file is processed in 10MiB chunks.
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## Example
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iex> Sha512.file("image.png")
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"97fd5243cd39e225f1478097acae71fbbff7f3027b24f0e6a8e06a0d7d3e6861cd05691d7470c76e7dfc4eb30459a906918d5ba0d144184fff02b8e34bd9ecf8"
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"""
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@spec file(Path.t()) :: String.t()
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def file(path) do
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hash_ref = :crypto.hash_init(:sha512)
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path
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|> stream_file()
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|> Enum.reduce(hash_ref, &:crypto.hash_update(&2, &1))
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|> :crypto.hash_final()
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|> Base.encode16(case: :lower)
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end
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if Version.match?(System.version(), ">= 1.16.0") do
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# `stream!/2` was added in Elixir 1.16 to accept a shortened form,
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# where we only need to specify the size of each stream chunk
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defp stream_file(file) do
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File.stream!(file, @chunk_size)
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end
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else
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# Use legacy stream/3 for older Elixir versions
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defp stream_file(file) do
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File.stream!(file, [], @chunk_size)
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end
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end
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end
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