PBKDF2 Hash Verifier

This tool provides a PBKDF2 hash verification workflow. It accepts the target hash, a password candidate, salt, iteration count, derived key length, and the PRF choice (for example HMAC-SHA256). It computes the derived key using the standard PBKDF2 function and compares it to the provided hash. All inputs are validated for type, format, and reasonable ranges before any computation begins to prevent invalid results or misconfigurations.

Conceptually, PBKDF2 is an iterated hashing process that strengthens passwords against brute-force attacks by using a pseudorandom function, salt, and many iterations. The tool implements RFC 8018 semantics and supports common encodings for both the input hash and the computed key (hex or base64). The verification is deterministic: with identical inputs, the derived key matches the target hash; any discrepancy indicates a non-match. This makes the tool suitable for credential hash audits, migration validation, and security testing across languages and platforms.

Value and differentiators include robust input validation, explicit error reporting, and clear, actionable outputs without exposing sensitive material. It is designed for security engineers, developers, and QA teams who need repeatable verification of PBKDF2 configurations. Use cases include validating new deployments, testing migration paths with different PRFs, and confirming that stored hashes were generated with the expected parameters. Core features include support for multiple PRFs, configurable dk_len, various encodings, and precise match reporting, all with careful handling of edge cases and invalid data.