Bcrypt Hash Generator
What is a Bcrypt Hash Generator?
Hash passwords and verify plain text against existing Bcrypt hash strings (`$2a$`, `$2b$`) using the Blowfish key derivation algorithm with configurable cost work factors (4 to 14).
Why Use This Tool?
- Database Password Auditing: Test and verify user passwords against stored database Bcrypt hash hashes during backend debugging.
- Password Storage Testing: Generate valid Bcrypt hash strings for seed databases or test fixtures.
- Cost Factor Benchmarking: Benchmark hash generation latency across cost factors 10, 12, and 14.
How to Use
- To Hash: Enter plain password and select Cost Factor (default: 10). Click "Hash Password".
- To Verify: Enter plain password and paste existing Bcrypt hash string. Click "Verify Password".
- View validation result: MATCH or NO MATCH.
Real Working Example
Input:
Plain Password: "secretPassword123" | Cost Factor: 10
Output Result:
Bcrypt Hash: $2b$10$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQOEg6Lruj3vjPGga31lW Verification: MATCH (Password Valid)
Important Technical Details & Security Standards
- Blowfish Key Derivation: Uses the Bcrypt adaptive password-hashing function with 128-bit salt.
- Configurable Cost Factor: Work factor exponent doubles computation rounds with each increment ($2^{\text{cost}}$ rounds).
- 100% Client-Side Memory: Passwords and hashes are processed locally without server transmission.
Related Security & Crypto Tools
- Htpasswd Generator: Generate htpasswd entries for Apache/Nginx.
- Password Strength Analyzer: Audit password entropy.
- Token Generator: Generate random tokens and secret keys.
Frequently Asked Questions
What is a good Bcrypt cost work factor?
A cost factor of 10 to 12 is recommended for modern servers, balancing security against login latency (~100-300ms).
What do the $2b$10$ prefixes in a Bcrypt hash mean?
`$2b$` identifies the Bcrypt algorithm version; `$10$` indicates the cost factor (2^10 = 1024 hashing rounds); the next 22 characters are the salt.
Is my plain password uploaded to a server?
No, all Bcrypt hashing and verification runs 100% locally in your web browser.
Is it free?
Yes, 100% free.
Why is Bcrypt safer than SHA-256 for passwords?
Bcrypt is intentionally slow and includes salt automatically, making GPU hardware brute-force rainbow table attacks infeasible.
Can two hashes of the same password look different?
Yes, Bcrypt generates a fresh random 128-bit salt for every hash, producing unique hash strings for identical passwords.