Bcrypt Hash Tool

This tool provides online bcrypt hash generation and verification. It solves the need for producing bcrypt hashes from plaintext inputs and validating existing hashes without exposing the original secret to downstream systems. Target users are software engineers implementing secure password storage, security auditors evaluating hashing configurations, and QA teams validating credential workflows during development and testing. It supports configurable cost factors, optional salts, and deterministic results for a given input. By separating generation and verification, teams can test hashing pipelines in isolation and compare outputs across environments, tools, and codebases.
Internally, the tool applies bcrypt by combining the chosen salt (or generated salt) with the plaintext and the specified cost factor, then computing the hash. For verification, it recomputes the hash using the provided plaintext, salt, and cost and compares it to the supplied hash using a constant-time comparison. Inputs are validated for correct formats and ranges; invalid cost values or malformed salts fail fast. Outputs include the resulting hash, the used cost, and the salt value, along with a boolean verification result when a hash to check is supplied.
Unique differentiators include explicit support for offline hashing without credential disclosure, strict input validation, and clear, auditable outputs suitable for code reviews and security assessments. The tool is language-agnostic and can be integrated into CI pipelines, security scanners, or interactive tooling. Typical use cases cover user account provisioning, password policy testing, and forensic validation of hashed data; limitations include reliance on bcrypt characteristics and absence of pepper handling beyond a provided salt.