SHA-256 Hash a Field With a Given Value

SHA-256 hash a field with a given value using the crypto:sha256() function

Query

logscale
a := "Hello, world!"
| crypto:sha256(a)

Introduction

In LogScale it is possible to encode strings using different algorithms such as MD5, SHA-1 and SHA-256 and create a hash; also called a fingerprint. The MD5 hash function is the weakest of the three, whereas SHA-256 is the strongest. The crypto:sha256() function is used to create the SHA-256 hash by taking a string of any length and encoding it into a 256-bit fingerprint. The fingerprint is returned as hexadecimal characters. Encoding the same string using the SHA-256 algorithm will always result in the same 256-bit hash output (64 hexadecimal digits).

In this example, the crypto:sha256() function is used to hash the field a with value Hello, world! and convert the result into _sha256.

Step-by-Step

  1. Starting with the source repository events.

  2. flowchart LR; %%{init: {"flowchart": {"defaultRenderer": "elk"}} }%% repo{{Events}} 0[\Add Field/] 1>Augment Data] result{{Result Set}} repo --> 0 0 --> 1 1 --> result style 0 fill:#ff0000,stroke-width:4px,stroke:#000;
    logscale
    a := "Hello, world!"

    Assigns the value Hello, world! to the field a.

  3. flowchart LR; %%{init: {"flowchart": {"defaultRenderer": "elk"}} }%% repo{{Events}} 0[\Add Field/] 1>Augment Data] result{{Result Set}} repo --> 0 0 --> 1 1 --> result style 1 fill:#ff0000,stroke-width:4px,stroke:#000;
    logscale
    | crypto:sha256(a)

    Performs a cryptographic SHA-256-hashing of a:= "Hello, world!". The output value would be _sha256 = "315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3"

  4. Event Result set.

Summary and Results

The query is used to encode a string using the SHA-256 hash. The hash generators MD5, SHA-1, and SHA-256 are, for example, useful for encoding passwords or representing other strings in the system as hashed values.