Bcrypt Generate

Hash passwords with bcrypt or verify existing hashes using Python's bcrypt library.

Input

For hashing:

• Password string to hash
• Cost/rounds (default: 10, range: 4–31)

For verification:

• Password string
• Existing bcrypt hash string (starts with $2b$ or $2a$)

Output

• Bcrypt hash string (for hashing mode)
• True/False result (for verification mode)

Instructions

1. Determine mode: hash a new password, or verify against an existing hash.

2. Hashing a password:

   python3 -c "import bcrypt; print(bcrypt.hashpw(b'PASSWORD', bcrypt.gensalt(rounds=ROUNDS)).decode())"
   

   Replace PASSWORD with the actual password and ROUNDS with the cost factor (default 10).

3. Verifying a password against a hash:

   python3 -c "import bcrypt; print(bcrypt.checkpw(b'PASSWORD', b'HASH'))"
   

   Replace PASSWORD and HASH with the actual values.

4. Check if bcrypt Python package is available before running:

   python3 -c "import bcrypt" 2>&1
   

   If it fails with ModuleNotFoundError, tell the user:

   "This skill requires the Python bcrypt package. Install with: pip3 install bcrypt."

5. If python3 is not found at all, tell the user:

   "This skill requires python3. Install with: brew install python3 (macOS) or sudo apt install python3 (Linux)."

6. Present the hash output on its own line. For verification, report clearly: "Password MATCHES the hash" or "Password does NOT match the hash."

Examples

Hash password "mysecret" with cost 10: Command: python3 -c "import bcrypt; print(bcrypt.hashpw(b'mysecret', bcrypt.gensalt(rounds=10)).decode())" Output: $2b$10$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW

Hash password "admin" with cost 12: Command: python3 -c "import bcrypt; print(bcrypt.hashpw(b'admin', bcrypt.gensalt(rounds=12)).decode())" Output: $2b$12$... (60-char bcrypt hash)

Verify "mysecret" against $2b$10$abc...: Command: python3 -c "import bcrypt; print(bcrypt.checkpw(b'mysecret', b'\$2b\$10\$abc...'))" Output: True

Error Handling

• python3 not found → tell user to install Python 3
• bcrypt module not found → tell user to run pip3 install bcrypt
• Password contains single quotes → escape them or note that the command must be adjusted; prefer using a temp Python script file for complex passwords
• Hash string malformed (does not start with $2b$ or $2a$) → warn the user the hash appears invalid before running
• High cost factor (>= 14) → warn the user this will be slow (intentional for security)