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How_to_generate_an_bcrypt_hash.md

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How to generate bcrypt hash

Prerequisites

  • Python 3
  • bcrypt library

Prerequisites Installation

Windows

Download and install Python 3 from official website. Check "Add python.exe to PATH" before running "Install Now".

Open Command Prompt (win + r, type "cmd" and press enter) and run the following command to install bcrypt library:

pip install bcrypt

Debian based distributions

sudo apt-get update
sudo apt-get install python3 python3-pip
# If you use have install python using apt
sudo apt-get install python3-bcrypt
# If don't install python using apt
pip3 install bcrypt
# If you got externally-managed-environment error
pip3 install bcrypt --break-system-packages

Fedora based distributions

sudo dnf update
sudo dnf install python3 python3-pip
# If you use have install python using apt
sudo dnf install python3-bcrypt
# If don't install python using apt
pip3 install bcrypt
# If you got externally-managed-environment error
pip3 install bcrypt --break-system-packages

Arch Linux based distributions

sudo pacman -Syy
sudo pacman -S python python-pip
# If you use have install python using apt
sudo pacman -S python-bcrypt
# If don't install python using apt
pip3 install bcrypt
# If you got externally-managed-environment error
pip3 install bcrypt --break-system-packages

Generating bcrypt hash from the command line

You can use the following one-liner command to generate a bcrypt hash directly in the cmd/ terminal:

python3 -c "import bcrypt; password = b'your_password_here'; assert len(password) < 72, 'Password must be less than 72 bytes due to bcrypt limitation'; hashed = bcrypt.hashpw(password, bcrypt.gensalt()); print(f'The hashed password is: {hashed.decode()}'); docker_interpolation = hashed.decode().replace('$', '$$'); print(f'The hashed password for a Docker env is: {docker_interpolation}')" # or python if you run this on Windows. CHANGE your_password_here BY YOUR PASSWORD

Please change your_password_here in the line by your own password.

Generating bcrypt hash from an script file

Do not name the file bcrypt.py as it will cause an error.

Create a python file with the following content:

import bcrypt

# Initial password
password = b"your_password_here"  # DO NOT REMOVE THE b

# Assert that the password is under 72 bytes
assert len(password) < 72, "Password must be less than 72 bytes due to bcrypt limitation"

# Generate a salt and hash the password
hashed = bcrypt.hashpw(password, bcrypt.gensalt())

# Print the hashed password
print(f'The hashed password is: {hashed.decode()}')

# Prepare the hashed password for Docker environment variables
docker_interpolation = hashed.decode().replace("$", "$$")
print(f'The hashed password for a Docker env is: {docker_interpolation}')

Replace your_password_here with the password you want to hash.

Run the python file and you will get the hashed password.

Get the right hash

Copy the 2nd line of the output (after the : ) and use it as your hashed password.

Exemple If the output is:

The hashed password is: $2b$12$NRiL4Kw4dKid.ix2WvZltOmaQBZjoX30shjHJXRVdEGshAxYWXXMe
The hashed password for an docker env is: $$2b$$12$$NRiL4Kw4dKid.ix2WvZltOmaQBZjoX30shjHJXRVdEGshAxYWXXMe

The docker line PASSWORD_HASH will be:

PASSWORD_HASH=$$2b$$12$$NRiL4Kw4dKid.ix2WvZltOmaQBZjoX30shjHJXRVdEGshAxYWXXMe