Python bcrypt Hash Code Example (Online Runner)

Online calculator: use the site bcrypt text tool.

Note: This snippet requires locally installed dependencies and will not run in the online runner.

Calculation method

bcrypt automatically generates a random salt for each hash. The tool exposes the cost factor (log rounds), which maps straight to bcrypt.gensalt(rounds=cost).

Install the dependency first: pip install bcrypt.

Implementation notes

• Package: bcrypt is the standard Python binding for the bcrypt password hash.
• Implementation: gensalt(rounds=cost) embeds the cost and salt into the output string; verification only needs the stored hash.
• Notes: bcrypt truncates passwords at 72 bytes, so normalize input encoding and length. Cost factors grow exponentially (each +1 doubles work), so tune for your latency budget.

import bcrypt


def bcrypt_hash(text: str, cost: int = 10) -> str:
    salt = bcrypt.gensalt(rounds=cost)
    return bcrypt.hashpw(text.encode("utf-8"), salt).decode("utf-8")


def bcrypt_verify(text: str, hashed: str) -> bool:
    return bcrypt.checkpw(text.encode("utf-8"), hashed.encode("utf-8"))

# Example usage
hashed = bcrypt_hash("correct horse battery staple", cost=12)
print(hashed)
print(bcrypt_verify("correct horse battery staple", hashed))

Complete script (implementation + tests)

import bcrypt


def run_tests() -> None:
    hashed = bcrypt.hashpw(b"password", bcrypt.gensalt(rounds=10))
    assert bcrypt.checkpw(b"password", hashed), "bcrypt verify failed"
    print("All bcrypt tests passed.")


if __name__ == "__main__":
    run_tests()