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cl-bcrypt

cl-bcrypt is a Common Lisp system for generating, parsing and verification of bcrypt password hashes.

Requirements

Installation

Clone the cl-bcrypt repo in your Quicklisp local-projects directory.

git clone https://github.com/dnaeon/cl-bcrypt.git

Load the system.

CL-USER> (ql:quickload :cl-bcrypt)

Supported Algorithm Identifiers

The supported hash algorithm identifiers are 2a and 2b.

Usage

The following section provides some examples to get you started with the cl-bcrypt system.

The functions discussed here are availabe in the CL-BCRYPT (and its nickname BCRYPT) package.

In order to create a new bcrypt password you need to use the BCRYPT:MAKE-PASSWORD function, e.g.

CL-USER> (defparameter *password*
           (bcrypt:make-password "my-secret-password"))
*PASSWORD*

BCRYPT:MAKE-PASSWORD accepts keyword parameters, which allow you to specify a different salt (e.g. obtained by BCRYPT:GENERATE-SALT), different cost factor than the default, and a different algorithm identifier than the default (e.g. 2a).

If you don't specify explicitely a salt, a random one will be generated for you by the BCRYPT:GENERATE-SALT function.

This example specifies a cost factor of 16 and a hash algorithm identifier 2a.

CL-USER> (defparameter *password*
           (bcrypt:make-password "my-secret-password" :cost 16 :identifier "2a"))
*PASSWORD*

You can use the BCRYPT:ALGORITHM-IDENTIFIER, BCRYPT:COST-FACTOR, BCRYPT:SALT and BCRYPT:PASSWORD-HASH readers to inspect the returned BCRYPT:PASSWORD instance from the BCRYPT:MAKE-PASSWORD function, e.g.

CL-USER> (bcrypt:algorithm-identifier *password*)
"2a"
CL-USER> (bcrypt:cost-factor *password*)
16
CL-USER> (bcrypt:salt *password*)
#(18 117 245 59 29 97 63 72 199 11 254 164 52 87 213 169)
CL-USER> (bcrypt:password-hash *password*)
#(94 0 171 116 90 235 30 220 57 45 147 214 210 77 244 223 63 14 153 13 140 213 183)

The BCRYPT:SALT and BCRYPT:PASSWORD-HASH readers return the raw bytes of the salt and the password hash respectively.

In order to encode a BCRYPT:PASSWORD instance into its text representation you need to use the BCRYPT:ENCODE function.

CL-USER> (bcrypt:encode *password*)
"$2a$16$ClVzMvzfNyhFA94iLDdToOVeApbDppFru3JXNUyi1y1x6MkO0KzZa"

A bcrypt password hash can be decoded using the BCRYPT:DECODE function, which will return a new instance of BCRYPT:PASSWORD, e.g.

CL-USER> (bcrypt:decode "$2a$16$ClVzMvzfNyhFA94iLDdToOVeApbDppFru3JXNUyi1y1x6MkO0KzZa")
#<CL-BCRYPT:PASSWORD {1002207AD3}>

If you encode back the returned instance you should get the same hash string as the one that was decoded.

The BCRYPT:PARSE-HASH function returns a property list of the parts that comprise the bcrypt hash string.

CL-USER> (bcrypt:parse-hash "$2a$16$ClVzMvzfNyhFA94iLDdToOVeApbDppFru3JXNUyi1y1x6MkO0KzZa")
(:ALGORITHM-IDENTIFIER "2a"
 :COST-FACTOR "16"
 :SALT "ClVzMvzfNyhFA94iLDdToO"
 :PASSWORD-HASH "VeApbDppFru3JXNUyi1y1x6MkO0KzZa")

When you need to test whether a given bcrypt hash matches a given password you can use the BCRYPT:PASSWORD= predicate, e.g.

CL-USER> (bcrypt:password= "my-secret-password"
                           "$2a$16$ClVzMvzfNyhFA94iLDdToOVeApbDppFru3JXNUyi1y1x6MkO0KzZa")
T

Tests

Tests are provided as part of the cl-bcrypt.test system.

In order to run the tests you can evaluate the following expressions.

CL-USER> (ql:quickload :cl-bcrypt.test)
CL-USER> (asdf:test-system :cl-bcrypt.test)

Or you can run the tests in a Docker container instead.

First, build the Docker image.

docker build -t cl-bcrypt .

Run the tests.

docker run --rm cl-bcrypt

Contributing

cl-bcrypt is hosted on Github. Please contribute by reporting issues, suggesting features or by sending patches using pull requests.

Authors

License

This project is Open Source and licensed under the BSD License.

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Common Lisp system for parsing and generating bcrypt password hashes

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