---
layout: docs
page_title: bcrypt - Functions - Configuration Language
description: |-
  The bcrypt function computes a hash of the given string using the Blowfish
  cipher.
---

# `bcrypt` Function

`bcrypt` computes a hash of the given string using the Blowfish cipher,
returning a string in [the _Modular Crypt
Format_](https://passlib.readthedocs.io/en/stable/modular_crypt_format.html)
usually expected in the shadow password file on many Unix systems.

```hcl
bcrypt(string, cost)
```

The `cost` argument is optional and will default to 10 if unspecified.

Since a bcrypt hash value includes a randomly selected salt, each call to this
function will return a different value, even if the given string and cost are
the same. Using this function directly with job arguments will therefore
cause spurious job updates.

The version prefix on the generated string (e.g. `$2a$`) may change in future
versions of Nomad.

## Examples

```shell-session
> bcrypt("hello world")
$2a$10$D5grTTzcsqyvAeIAnY/mYOIqliCoG7eAMX0/oFcuD.iErkksEbcAa
```
