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Crypto module

The Crypto module contains functions that deal with cryptography.

hash/1​

Equivalent to hash/2 with the second argument "sha256".

hash/2​

Crypto.hash("my text", "sha256") # "7330D2B39CA35EA..."
Crypto.hash("my text", "sha512") # "A3D7E45A0D9BE5F..."

Parameters:

  • str the text to hash
  • algo the hash algorithm ("sha256", "sha512", "sha3_256", "sha3_512", "blake2b", "keccak256")

Returns the hash of str by using algo algorithm.

hmac/1​

Equivalent to hmac/2 with the second argument "sha256".

hmac/2​

Equivalent to hmac/3 with the third argument being a key created from the contract seed and secret data known by nodes. The key created is deterministic and will always be the same for a contract.

hmac/3​

Crypto.hmac("my text") # "374C7527733556..."
Crypto.hmac("my text", "sha256") # "374C7527733556..."
Crypto.hmac("my text", "sha256", "secret_key") # "901A365FF22B895..."

Parameters:

  • data the data to hash (if the data is hexadecimal it will be decoded in binary)
  • algo the hash algorithm ("sha256", "sha512", "sha3_256", "sha3_512")
  • key the key to perform the hmac (if the data is hexadecimal it will be decoded in binary)

Returns the hmac of data with key using algo.

sign_with_recovery/1​

signature_payload = Crypto.hash("tintin", "keccak256")
Crypto.sign_with_recovery(signature_payload) # [r: "00ABCD...", s: "00BCDE...", v: 0]

Parameters:

  • hash the hash to sign

Return a signature of the given hash.

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