// tool reference · Platform & Learning
SHA-256 / HMAC Free
Compute SHA-256 digests and HMAC signatures.
What it does
Computes SHA-256 digests and HMAC signatures — for verifying a download, comparing an IOC hash, or debugging a webhook signature.
When to use it
- Verifying file integrity; debugging an HMAC that will not validate.
Inputs
Field names are the actual form parameters, verified against source.
| Field | Type | Required | Notes |
|---|---|---|---|
| text | textarea | required | Input to hash. |
| hmac_key | text | optional | Key — supply it to compute an HMAC rather than a plain digest. |
What you get back
The digest or signature.
How it works
Deterministic. Local.
Privacy
Nothing is stored.
Standards
FIPS 180-4 (SHA-2)RFC 2104 (HMAC)