Crypto
bcrypt Hash Verify
Create and verify local password hashes with cost controls.
About bcrypt Hash Verify
bcrypt Hash Verify helps test password hashing behavior by creating local hashes with configurable cost and verifying candidate passwords against existing hashes.
Common uses
- Generate a sample hash for documentation.
- Verify a copied hash and password during local debugging.
- Compare how cost settings affect runtime on your machine.
Good to know
Use established server-side password hashing libraries in production, with secure password handling and rate limiting around login flows.
How to verify a password hash
Use the verify mode when you have an existing bcrypt hash and a candidate password. The salt and cost are embedded in the hash, so the same password will not create identical hash strings each time.
Choosing a cost
Higher costs slow down guessing attacks but also increase login time. Test the setting on production-like hardware before changing authentication behavior.
Common mistakes
Do not use bcrypt for general file checksums or API signatures. It is designed for password hashing, where slow verification is a feature.
Before you rely on the output
- Treat generated cryptographic values as development aids unless your production security process has approved the browser, algorithm, and key-handling workflow.
- Privacy mode: inputs are processed locally in your browser and are not intentionally sent to an application server.