crypto_data_hash/3

Module

This predicate is provided by crypto.pl.

Load this module before using the predicate:

:- consult('/v1/lib/crypto.pl').

Description

Computes the Hash of Data using a configured hashing algorithm.

Options may be a single option term or a list of option terms:

• algorithm(+Algorithm) selects sha256 (default), sha512, or md5;
• encoding(+Encoding) selects utf8 (default), text, hex, or octet.

Data is interpreted according to Encoding and Hash is unified with the resulting digest as a list of bytes.

Signature

crypto_data_hash(+Data, ?Hash, +Options) is det

Examples

Compute a SHA-256 hash with default options

This scenario demonstrates how to compute a SHA-256 digest from text using the default options.

Here are the steps of the scenario:

• Given the query:

consult('/v1/lib/crypto.pl'),
crypto_data_hash('hello world', Hash, []),
hex_bytes(Hex, Hash).

• When the query is run
• Then the answer we get is:

height: 42
gas_used: 65436
answer:
  has_more: false
  variables: ["Hash", "Hex"]
  results:
  - substitutions:
    - variable: Hash
      expression: "[185,77,39,185,147,77,62,8,165,46,82,215,218,125,171,250,196,132,239,227,122,83,128,238,144,136,247,172,226,239,205,233]"
    - variable: Hex
      expression: "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"