Cryptex

Cryptographic APIs and routines for Elixir.

Supported algorithms

Cryptographic hashes

• MD4 (Cryptex.Hasher.MD4)
• MD5 (Cryptex.Hasher.MD5)
• RIPEMD-160 (Cryptex.Hasher.Ripemd160)
• SHA-1 (Cryptex.Hasher.Sha1)
• SHA-224 (Cryptex.Hasher.Sha224)
• SHA-256 (Cryptex.Hasher.Sha256)
• SHA-384 (Cryptex.Hasher.Sha384)
• SHA-512 (Cryptex.Hasher.Sha512)
• Whirlpool (Cryptex.Hasher.Whirlpool)

Message authentication codes

• HMAC (Cryptex.Mac.Hmac)

Key derivation functions

• PBKDF2 (Cryptex.Kdf.Pbkdf2)

Utilities

• Message crypt format encoding (Cryptex.Mcf)

Installation

If available in Hex, the package can be installed as:

1. Add cryptex to your list of dependencies in mix.exs:

   def deps do [{:cryptex, "~> 0.0.1"}] end

2. Ensure cryptex is started before your application:

   def application do [applications: [:cryptex]] end

Examples

Calculate a SHA-256 hash

Cryptex.Hasher.digest(:sha256, "test") |> Base.encode16
  # => "9F86D081884C7D659A2FEAA0C55AD015A3BF4F1B2B0B822CD15D6C15B0F00A08"

Cryptex.Hasher.digest(Cryptex.Hasher.Algorithm.Sha256, "test") |> Base.encode16

Cryptex.Hasher.new(:sha256)
|> Cryptex.Hasher.new_state
|> Cryptex.Hasher.State.update("te")
|> Cryptex.Hasher.State.update("st")
|> Cryptex.Hasher.State.digest |> Base.encode16

Cryptex.Hasher.digest(:sha256, ["te", "st"]) |> Base.encode16

Calculate the SHA-512 hash of a file

Cryptex.Hasher.digest(:sha512, File.stream!("mix.lock")) |> Base.encode16
  # => "BAC0FB5040C777E4125F413A5F0B02D6E8116E9ABDEF331C861F6AF5F7536AFB2B632D3C6FCB379555F32C8DAE735E15C6D1EB2719C0AD6B2526B7073B5D525A"

File.stream!("mix.lock")
|> Enum.into(Cryptex.Hasher.new_state(:sha512))
|> Cryptex.Hasher.State.digest |> Base.encode16

Calculate an HMAC

Cryptex.Mac.Hmac.generate(Cryptex.Hasher.new(:sha256), "key", "test") |> Base.encode16
  # => "02AFB56304902C656FCB737CDD03DE6205BB6D401DA2812EFD9B2D36A08AF159"

Cryptex.Mac.Hmac.new(:sha256)
|> Cryptex.Mac.Hmac.generate("key", "test") |> Base.encode16

Verify an HMAC

mac = "02AFB56304902C656FCB737CDD03DE6205BB6D401DA2812EFD9B2D36A08AF159"
Cryptex.Mac.Hmac.is_authenticated?(:sha256, "key", "test", mac |> Base.decode16!)
  # => true

Derive a key using PBKDF2 and encode with MCF

Cryptex.Kdf.Pbkdf2.derive(Cryptex.Mac.Hmac.new(:sha512), "secret") |> Cryptex.Mcf.encode
  # => "$pbkdf2-sha512$160000$DM31Hc6BkHrbuVi0muAcFQ$cCAm0XJMQ4Go81UiXfO8/9HZHEKWTDTbL37gm9KNA9xeWv1Zi12EmtMx6vxBJD5zECKIx63lVAckGBQIyIKgaA"

Cryptex.Kdf.Pbkdf2.new(Cryptex.Mac.Hmac.new(:sha512))
|> Cryptex.Kdf.Pbkdf2.derive("secret", "DM31Hc6BkHrbuVi0muAcFQ" |> Cryptex.Kdf.Pbkdf2.Mcf.Alphabet.decode!)
|> Cryptex.Mcf.encode