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How to Calculate A File Checksum In Elixir?

5 minutes read

In Elixir, you can calculate a checksum of a file by using the Digest module from the standard library. One common checksum algorithm is the MD5 algorithm, which can be used to calculate a checksum of a file in Elixir.


You can calculate the MD5 checksum of a file by reading the file contents and passing it to the :crypto module's hash function. Here's an example code snippet that calculates the MD5 checksum of a file:

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defmodule FileChecksum do
  def md5(file_path) do
    {:ok, file} = File.open(file_path, [:read])
    {:ok, contents} = IO.binread(file, :all)
    checksum = :crypto.hash(:md5, contents)
    checksum
  end
end

# Calculate the MD5 checksum of a file
file_path = "path/to/your/file.ext"
checksum = FileChecksum.md5(file_path)
IO.puts("MD5 checksum of the file: #{checksum}")


In this code snippet, the md5 function reads the contents of the specified file and calculates the MD5 checksum using the :crypto.hash function. The calculated checksum is then returned and can be printed or used in your application as needed.


How to calculate a checksum for a remote file in Elixir?

To calculate a checksum for a remote file in Elixir, you can use the following steps:

  1. Use the HTTPoison library to download the remote file. You first need to add HTTPoison as a dependency in your mix.exs file:
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defp deps do
  [{:httpoison, "~> 1.8"}]
end


  1. Use HTTPoison to download the remote file and store it locally. Here's an example code snippet:
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{:ok, result} = HTTPoison.get("http://example.com/remote_file.txt")
{:ok, file} = File.open("local_file.txt", [:write])
IO.binwrite(file, result.body)
File.close(file)


  1. Calculate the checksum of the local file using Elixir's built-in :crypto library. Here's an example code snippet:
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File.stream!("local_file.txt", [], 8192)
|> Enum.reduce(:crypto.hash_init(:sha256), fn chunk, state ->
  :crypto.hash_update(state, chunk)
end)
|> :crypto.hash_final()
|> Base.encode16(case: :lower)
|> IO.puts()


The above code will download a remote file, save it locally, and calculate the checksum of the local file using the SHA-256 hashing algorithm. You can replace the hashing algorithm with other algorithms like MD5 or SHA-1 if needed.


How to calculate a file checksum in Elixir using SHA-1?

To calculate a file checksum in Elixir using SHA-1, you can use the :crypto module which provides cryptographic functions such as hashing algorithms. Here is an example of how to calculate the checksum of a file using SHA-1:

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defmodule FileChecksum do
  def checksum(file_path) do
    {:ok, file} = File.open(file_path, [:read])

    hash =
      file
      |> Enum.reduce(:crypto.hash_init(:sha), fn chunk, acc ->
        :crypto.hash_update(acc, chunk)
      end)
      |> :crypto.hash_final()

    File.close(file)
    
    :crypto.hash |> Base.encode16()
  end
end

file_path = "path/to/your/file.txt"
checksum = FileChecksum.checksum(file_path)
IO.puts("SHA-1 checksum of #{file_path}: #{checksum}")


In this example, the FileChecksum module defines a function checksum that takes a file path as input and calculates the SHA-1 checksum of the file. The function opens the file, reads it in chunks, updates the hash with each chunk, and then finalizes the hash to get the checksum. The checksum is then encoded to hexadecimal format before being returned. Finally, the checksum is printed to the console.


You can run this code in an Elixir script or in an Elixir iex session, providing the path to the file you want to calculate the checksum for.


How to calculate a file checksum in Elixir with XXHash algorithm?

To calculate a file checksum in Elixir with the XXHash algorithm, you can use the :xxhash module from the :erlport library. Here is an example of how to calculate the checksum of a file using XXHash:


First, you will need to add the :erlport library to your Elixir project by adding it to your mix.exs file:

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defp deps do
  [
    {:erlport, "~> 0.7"}
  ]
end


Then, you can use the following code to calculate the checksum of a file using the XXHash algorithm:

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defmodule FileChecksum do
  def xxhash_file(file_path) do
    {:ok, file} = File.open(file_path, [:raw, :read])
    {:ok, hasher} = :xxhash.seed(0)

    with {:ok, buffer} <- File.read(file, 4096),
         :ok <- :xxhash.update(hasher, buffer) do
      case :file.stream(file, 4096) do
        {:ok, stream_ref} ->
          process_stream(file, stream_ref, hasher)
        {:error, reason} ->
          IO.puts("Error processing file stream: #{reason}")
      end
    end
  end

  defp process_stream(file, stream_ref, hasher) do
    case :file.stream_read(file, stream_ref, 4096) do
      {:ok, {size, buffer}} when size > 0 ->
        hasher = :xxhash.update(hasher, buffer)
        process_stream(file, stream_ref, hasher)
      {:ok, {size, _buffer}} when size == 0 ->
        :ok
    end
  end
end

# Calculate checksum of a file
FileChecksum.xxhash_file("path/to/file.ext")


This code opens the file, reads it in chunks of 4096 bytes, and updates the XXHash checksum with each chunk. The xxhash_file/1 function calculates the checksum of the entire file and returns the final checksum value.


Make sure to specify the correct file path in the FileChecksum.xxhash_file("path/to/file.ext") call to calculate the checksum of your desired file.


How to compare two checksums in Elixir to check if the files are identical?

One way to compare two checksums in Elixir is to use the :crypto.hash/2 function to calculate the checksum of each file and then compare the results. Here's an example implementation:

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defmodule ChecksumHelper do
  def checksum(file_path) do
    {:ok, file} = File.read(file_path)
    :crypto.hash(:sha256, file)
  end

  def compare_checksums(checksum1, checksum2) do
    checksum1 == checksum2
  end
end


In this example, the ChecksumHelper module defines a checksum/1 function that calculates the SHA-256 checksum of a given file. The compare_checksums/2 function is used to compare two checksums.


You can use these functions like this:

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file_path1 = "path/to/file1"
file_path2 = "path/to/file2"

checksum1 = ChecksumHelper.checksum(file_path1)
checksum2 = ChecksumHelper.checksum(file_path2)

if ChecksumHelper.compare_checksums(checksum1, checksum2) do
  IO.puts("The files are identical.")
else
  IO.puts("The files are different.")
end


This code will calculate the checksums of file1 and file2 and compare them to determine if the files are identical.


What is SHA-512 checksum and how is it calculated in Elixir?

SHA-512 is a cryptographic hash function that produces a fixed-size output (512 bits or 64 bytes) regardless of the input size. It is commonly used to generate checksums for data integrity verification and cryptographic applications.


In Elixir, you can calculate the SHA-512 checksum using the :crypto module, which provides various cryptographic functions including SHA-512 hashing. Here's an example of how you can calculate the SHA-512 checksum of a string in Elixir:

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text = "Hello, World!"
checksum = :crypto.hash(:sha512, text)
IO.puts(:crypto.hash_to_binary(checksum))


In this example, we first define a string text that we want to calculate the checksum for. We then use the :crypto.hash function to calculate the SHA-512 checksum of the string. Finally, we convert the checksum to a binary representation using :crypto.hash_to_binary and print it to the console.


This is a basic example of how to calculate a SHA-512 checksum in Elixir. Keep in mind that you may need to handle encoding and padding depending on the specific requirements of your application.

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