=========================
Python scrypt_ bindings
=========================
This is a set of Python_ bindings for the scrypt_ key derivation
function.
.. image:: https://img.shields.io/pypi/v/scrypt.svg
:target: https://pypi.python.org/pypi/scrypt/
:alt: Latest Version
.. image:: https://anaconda.org/conda-forge/scrypt/badges/version.svg
:target: https://anaconda.org/conda-forge/scrypt
.. image:: https://anaconda.org/conda-forge/scrypt/badges/downloads.svg
:target: https://anaconda.org/conda-forge/scrypt
Scrypt is useful when encrypting password as it is possible to specify
a *minimum* amount of time to use when encrypting and decrypting. If,
for example, a password takes 0.05 seconds to verify, a user won't
notice the slight delay when signing in, but doing a brute force
search of several billion passwords will take a considerable amount of
time. This is in contrast to more traditional hash functions such as
MD5 or the SHA family which can be implemented extremely fast on cheap
hardware.
Installation
============
Or you can install the latest release from PyPi::
$ pip install scrypt
Users of the Anaconda_ Python distribution can directly obtain pre-built
Windows, Intel Linux or macOS / OSX binaries from the conda-forge channel.
This can be done via::
$ conda install -c conda-forge scrypt
If you want py-scrypt for your Python 3 environment, just run the
above commands with your Python 3 interpreter. Py-scrypt supports both
Python 2 and 3.
From version 0.6.0 (not available on PyPi yet), py-scrypt supports
PyPy as well.
Build From Source
=================
For Debian and Ubuntu, please ensure that the following packages are installed:
.. code:: bash
$ sudo apt-get install build-essential libssl-dev python-dev
For Fedora and RHEL-derivatives, please ensure that the following packages are installed:
.. code:: bash
$ sudo yum install gcc openssl-devel python-devel
For OSX, please do the following::
$ brew install openssl
$ export CFLAGS="-I$(brew --prefix openssl)/include $CFLAGS"
$ export LDFLAGS="-L$(brew --prefix openssl)/lib $LDFLAGS"
For OSX, you can also use the precompiled wheels. They are installed by::
$ pip install scrypt
For Windows, please use the precompiled wheels. They are installed by::
$ pip install scrypt
For Windows, when the package should be compiled, the development package from https://slproweb.com/products/Win32OpenSSL.html is needed.
It needs to be installed to `C:\OpenSSL-Win64` or `C:\Program Files\OpenSSL`.
It is also possible to use the Chocolatey package manager to install OpenSSL:
```
choco install openssl
```
You can install py-scrypt from this repository if you want the latest
but possibly non-compiling version::
$ git clone https://github.com/holgern/py-scrypt.git
$ cd py-scrypt
$ python setup.py build
Become superuser (or use virtualenv):
# python setup.py install
Run tests after install:
$ python setup.py test
Changelog
=========
0.9.1
-----
* No notable change
0.9.0
-----
* Update to scrypt 1.3.3
0.8.29
------
* Fix build for OSX using openssl 3.0
* Build Wheel for Python 3.13
* switch to ruff
0.8.24
------
* Building of all wheels works with github actions
0.8.20
------
* Fix #8 by adding missing gettimeofday.c to MANIFEST.in
0.8.19
------
* Use RtlGenRandom instead of CryptGenRandom on windows (Thanks to https://github.com/veorq/cryptocoding/)
* Add check for c:\Program Files\OpenSSL-Win64 and c:\Program Files\OpenSSL-Win32
0.8.18
------
* add wheel for python 3.9
0.8.17
------
* add_dll_directory for python 3.8 on windows, as importlib.util.find_spec does not search all paths anymore
0.8.16
------
* Add additional test vector from RFC (thanks to @ChrisMacNaughton)
0.8.15
------
* Fix missing import
0.8.14
------
* fix imp deprecation warning
0.8.13
------
* improve build for conda forge
0.8.12
------
* Add SCRYPT_WINDOWS_LINK_LEGACY_OPENSSL environment variable, when set, openssl 1.0.2 is linked
0.8.11
------
* fix build for conda feedstock
0.8.10
------
* fix typo
0.8.9
-----
* use the static libcrypto_static for windows and openssl 1.1.1
0.8.8
-----
* setup.py for windows improved, works with openssl 1.0.2 and 1.1.1
0.8.7
-----
* setup.py for windows fixed
0.8.6
-----
* setup.py fixed, scrypt could not be imported in version 0.8.5
0.8.5
-----
* MANIFEST.in fixed
* scrypt.py moved into own scrypt directory with __init__.py
* openssl library path for osx wheel repaired
0.8.4
-----
* __version__ added to scrypt
* missing void in sha256.c fixed
0.8.3
-----
* scrypt updated to 1.2.1
* Wheels are created for python 3.6
Usage
=====
For encryption/decryption, the library exports two functions
``encrypt`` and ``decrypt``::
>>> import scrypt
>>> data = scrypt.encrypt('a secret message', 'password', maxtime=0.1) # This will take at least 0.1 seconds
>>> data[:20]
'scrypt\x00\r\x00\x00\x00\x08\x00\x00\x00\x01RX9H'
>>> scrypt.decrypt(data, 'password', force=True) # This will also take at least 0.1 seconds
'a secret message'
>>> scrypt.decrypt(data, 'password', maxtime=0.05) # scrypt won't be able to decrypt this data fast enough
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
scrypt.error: decrypting file would take too long
>>> scrypt.decrypt(data, 'wrong password', force=True) # scrypt will throw an exception if the password is incorrect
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
scrypt.error: password is incorrect
From these, one can make a simple password verifier using the following
functions::
import os
import scrypt
def hash_password(password, maxtime=0.5, datalength=64):
"""Create a secure password hash using scrypt encryption.
Args:
password: The password to hash
maxtime: Maximum time to spend hashing in seconds
datalength: Length of the random data to encrypt
Returns:
bytes: An encrypted hash suitable for storage and later verification
"""
return scrypt.encrypt(os.urandom(datalength), password, maxtime=maxtime)
def verify_password(hashed_password, guessed_password, maxtime=0.5):
"""Verify a password against its hash with better error handling.
Args:
hashed_password: The stored password hash from hash_password()
guessed_password: The password to verify
maxtime: Maximum time to spend in verification
Returns:
tuple: (is_valid, status_code) where:
- is_valid: True if password is correct, False otherwise
- status_code: One of "correct", "wrong_password", "time_limit_exceeded",
"memory_limit_exceeded", or "error"
Raises:
scrypt.error: Only raised for resource limit errors, which you may want to
handle by retrying with higher limits or force=True
"""
try:
scrypt.decrypt(hashed_password, guessed_password, maxtime, encoding=None)
return True, "correct"
except scrypt.error as e:
# Check the specific error message to differentiate between causes
error_message = str(e)
if error_message == "password is incorrect":
# Wrong password was provided
return False, "wrong_password"
elif error_message == "decrypting file would take too long":
# Time limit exceeded
raise # Re-raise so caller can handle appropriately
elif error_message == "decrypting file would take too much memory":
# Memory limit exceeded
raise # Re-raise so caller can handle appropriately
else:
# Some other error occurred (corrupted data, etc.)
return False, "error"
# Example usage:
# Create a hash of a password
stored_hash = hash_password("correct_password", maxtime=0.1)
# Verify with correct password
is_valid, status = verify_password(stored_hash, "correct_password", maxtime=0.1)
if is_valid:
print("Password is correct!") # This will be printed
# Verify with wrong password
is_valid, status = verify_password(stored_hash, "wrong_password", maxtime=0.1)
if not is_valid:
if status == "wrong_password":
print("Password is incorrect!") # This will be printed
# Verify with insufficient time
try:
# Set maxtime very low to trigger a time limit error
is_valid, status = verify_password(stored_hash, "correct_password", maxtime=0.00001)
except scrypt.error as e:
if "would take too long" in str(e):
print("Time limit exceeded, try with higher maxtime or force=True")
# Retry with force=True
result = scrypt.decrypt(stored_hash, "correct_password", maxtime=0.00001, force=True, encoding=None)
print("Forced decryption successful!")
The `encrypt` function accepts several parameters to control its behavior::
encrypt(input, password, maxtime=5.0, maxmem=0, maxmemfrac=0.5, logN=0, r=0, p=0, force=False, verbose=False)
Where:
- `input`: Data to encrypt (bytes or str)
- `password`: Password for encryption (bytes or str)
- `maxtime`: Maximum time to spend in seconds
- `maxmem`: Maximum memory to use in bytes (0 for unlimited)
- `maxmemfrac`: Maximum fraction of available memory to use (0.0 to 1.0)
- `logN`, `r`, `p`: Parameters controlling the scrypt key derivation function
- If all three are zero (default), optimal parameters are chosen automatically
- If provided, all three must be non-zero and will be used explicitly
- `force`: If True, do not check whether encryption will exceed the estimated memory or time
- `verbose`: If True, display parameter information
The `decrypt` function has a simpler interface::
decrypt(input, password, maxtime=300.0, maxmem=0, maxmemfrac=0.5, encoding='utf-8', verbose=False, force=False)
Where:
- `input`: Encrypted data (bytes or str)
- `password`: Password for decryption (bytes or str)
- `maxtime`: Maximum time to spend in seconds
- `maxmem`: Maximum memory to use in bytes (0 for unlimited)
- `maxmemfrac`: Maximum fraction of available memory to use
- `encoding`: Encoding to use for output string (None for raw bytes)
- `verbose`: If True, display parameter information
- `force`: If True, do not check whether decryption will exceed the estimated memory or time
But, if you want output that is deterministic and constant in size,
you can use the ``hash`` function::
>>> import scrypt
>>> h1 = scrypt.hash('password', 'random salt')
>>> len(h1) # The hash will be 64 bytes by default, but is overridable.
64
>>> h1[:10]
'\xfe\x87\xf3hS\tUo\xcd\xc8'
>>> h2 = scrypt.hash('password', 'random salt')
>>> h1 == h2 # The hash function is deterministic
True
The `hash` function accepts the following parameters::
hash(password, salt, N=1<<14, r=8, p=1, buflen=64)
Where:
- `password`: The password to hash (bytes or str)
- `salt`: Salt for the hash (bytes or str)
- `N`: CPU/memory cost parameter (must be a power of 2)
- `r`: Block size parameter
- `p`: Parallelization parameter
- `buflen`: Output buffer length
The parameters r, p, and buflen must satisfy r * p < 2^30 and
buflen <= (2^32 - 1) * 32. The parameter N must be a power of 2
greater than 1. N, r, and p must all be positive.
For advanced usage, the library also provides two utility functions:
- `pickparams(maxmem=0, maxmemfrac=0.5, maxtime=5.0, verbose=0)`:
Automatically chooses optimal scrypt parameters based on system resources.
Returns (logN, r, p) tuple.
- `checkparams(logN, r, p, maxmem=0, maxmemfrac=0.5, maxtime=5.0, verbose=0, force=0)`:
Verifies that the provided parameters are valid and within resource limits.
Acknowledgements
================
Scrypt_ was created by Colin Percival and is licensed as 2-clause BSD.
Since scrypt does not normally build as a shared library, I have included
the source for the currently latest version of the library in this
repository. When a new version arrives, I will update these sources.
`Kelvin Wong`_ on Bitbucket provided changes to make the library
available on Mac OS X 10.6 and earlier, as well as changes to make the
library work more like the command-line version of scrypt by
default. Kelvin also contributed with the unit tests, lots of cross
platform testing and work on the ``hash`` function.
Burstaholic_ on Bitbucket provided the necessary changes to make
the library build on Windows.
The `python-appveyor-demo`_ repository for setting up automated Windows
builds for a multitude of Python versions.
License
=======
This library is licensed under the same license as scrypt; 2-clause BSD.
.. _scrypt: http://www.tarsnap.com/scrypt.html
.. _Python: http://python.org
.. _Burstaholic: https://bitbucket.org/Burstaholic
.. _Kelvin Wong: https://bitbucket.org/kelvinwong_ca
.. _python-appveyor-demo: https://github.com/ogrisel/python-appveyor-demo
.. _Anaconda: https://www.continuum.io
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"author": "Magnus Hallin",
"author_email": "mhallin@gmail.com",
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"description": "=========================\n Python scrypt_ bindings\n=========================\n\nThis is a set of Python_ bindings for the scrypt_ key derivation\nfunction.\n\n.. image:: https://img.shields.io/pypi/v/scrypt.svg\n :target: https://pypi.python.org/pypi/scrypt/\n :alt: Latest Version\n\n.. image:: https://anaconda.org/conda-forge/scrypt/badges/version.svg\n :target: https://anaconda.org/conda-forge/scrypt\n\n.. image:: https://anaconda.org/conda-forge/scrypt/badges/downloads.svg\n :target: https://anaconda.org/conda-forge/scrypt\n\n\nScrypt is useful when encrypting password as it is possible to specify\na *minimum* amount of time to use when encrypting and decrypting. If,\nfor example, a password takes 0.05 seconds to verify, a user won't\nnotice the slight delay when signing in, but doing a brute force\nsearch of several billion passwords will take a considerable amount of\ntime. This is in contrast to more traditional hash functions such as\nMD5 or the SHA family which can be implemented extremely fast on cheap\nhardware.\n\nInstallation\n============\n\nOr you can install the latest release from PyPi::\n\n $ pip install scrypt\n\nUsers of the Anaconda_ Python distribution can directly obtain pre-built\nWindows, Intel Linux or macOS / OSX binaries from the conda-forge channel.\nThis can be done via::\n\n $ conda install -c conda-forge scrypt\n\n\nIf you want py-scrypt for your Python 3 environment, just run the\nabove commands with your Python 3 interpreter. Py-scrypt supports both\nPython 2 and 3.\n\nFrom version 0.6.0 (not available on PyPi yet), py-scrypt supports\nPyPy as well.\n\nBuild From Source\n=================\n\nFor Debian and Ubuntu, please ensure that the following packages are installed:\n\n.. code:: bash\n\n $ sudo apt-get install build-essential libssl-dev python-dev\n\nFor Fedora and RHEL-derivatives, please ensure that the following packages are installed:\n\n.. code:: bash\n\n $ sudo yum install gcc openssl-devel python-devel\n\nFor OSX, please do the following::\n\n $ brew install openssl\n $ export CFLAGS=\"-I$(brew --prefix openssl)/include $CFLAGS\"\n $ export LDFLAGS=\"-L$(brew --prefix openssl)/lib $LDFLAGS\"\n\nFor OSX, you can also use the precompiled wheels. They are installed by::\n\n $ pip install scrypt\n\nFor Windows, please use the precompiled wheels. They are installed by::\n\n $ pip install scrypt\n\nFor Windows, when the package should be compiled, the development package from https://slproweb.com/products/Win32OpenSSL.html is needed.\nIt needs to be installed to `C:\\OpenSSL-Win64` or `C:\\Program Files\\OpenSSL`.\n\nIt is also possible to use the Chocolatey package manager to install OpenSSL:\n\n```\nchoco install openssl\n```\n\nYou can install py-scrypt from this repository if you want the latest\nbut possibly non-compiling version::\n\n $ git clone https://github.com/holgern/py-scrypt.git\n $ cd py-scrypt\n $ python setup.py build\n\n Become superuser (or use virtualenv):\n # python setup.py install\n\n Run tests after install:\n $ python setup.py test\n\n\nChangelog\n=========\n0.9.1\n-----\n* No notable change\n\n0.9.0\n-----\n* Update to scrypt 1.3.3\n\n0.8.29\n------\n* Fix build for OSX using openssl 3.0\n* Build Wheel for Python 3.13\n* switch to ruff\n\n0.8.24\n------\n* Building of all wheels works with github actions\n\n0.8.20\n------\n* Fix #8 by adding missing gettimeofday.c to MANIFEST.in\n\n0.8.19\n------\n* Use RtlGenRandom instead of CryptGenRandom on windows (Thanks to https://github.com/veorq/cryptocoding/)\n* Add check for c:\\Program Files\\OpenSSL-Win64 and c:\\Program Files\\OpenSSL-Win32\n\n0.8.18\n------\n* add wheel for python 3.9\n\n0.8.17\n------\n\n* add_dll_directory for python 3.8 on windows, as importlib.util.find_spec does not search all paths anymore\n\n0.8.16\n------\n\n* Add additional test vector from RFC (thanks to @ChrisMacNaughton)\n\n0.8.15\n------\n\n* Fix missing import\n\n\n0.8.14\n------\n\n* fix imp deprecation warning\n\n\n0.8.13\n------\n\n* improve build for conda forge\n\n0.8.12\n------\n\n* Add SCRYPT_WINDOWS_LINK_LEGACY_OPENSSL environment variable, when set, openssl 1.0.2 is linked\n\n0.8.11\n------\n\n* fix build for conda feedstock\n\n0.8.10\n------\n\n* fix typo\n\n0.8.9\n-----\n\n* use the static libcrypto_static for windows and openssl 1.1.1\n\n0.8.8\n-----\n\n* setup.py for windows improved, works with openssl 1.0.2 and 1.1.1\n\n0.8.7\n-----\n\n* setup.py for windows fixed\n\n0.8.6\n-----\n\n* setup.py fixed, scrypt could not be imported in version 0.8.5\n\n0.8.5\n-----\n\n* MANIFEST.in fixed\n* scrypt.py moved into own scrypt directory with __init__.py\n* openssl library path for osx wheel repaired\n\n0.8.4\n-----\n\n* __version__ added to scrypt\n* missing void in sha256.c fixed\n\n0.8.3\n-----\n\n* scrypt updated to 1.2.1\n* Wheels are created for python 3.6\n\nUsage\n=====\n\nFor encryption/decryption, the library exports two functions\n``encrypt`` and ``decrypt``::\n\n >>> import scrypt\n >>> data = scrypt.encrypt('a secret message', 'password', maxtime=0.1) # This will take at least 0.1 seconds\n >>> data[:20]\n 'scrypt\\x00\\r\\x00\\x00\\x00\\x08\\x00\\x00\\x00\\x01RX9H'\n >>> scrypt.decrypt(data, 'password', force=True) # This will also take at least 0.1 seconds\n 'a secret message'\n >>> scrypt.decrypt(data, 'password', maxtime=0.05) # scrypt won't be able to decrypt this data fast enough\n Traceback (most recent call last):\n File \"<stdin>\", line 1, in <module>\n scrypt.error: decrypting file would take too long\n >>> scrypt.decrypt(data, 'wrong password', force=True) # scrypt will throw an exception if the password is incorrect\n Traceback (most recent call last):\n File \"<stdin>\", line 1, in <module>\n scrypt.error: password is incorrect\n\nFrom these, one can make a simple password verifier using the following\nfunctions::\n\n import os\n import scrypt\n\n def hash_password(password, maxtime=0.5, datalength=64):\n \"\"\"Create a secure password hash using scrypt encryption.\n\n Args:\n password: The password to hash\n maxtime: Maximum time to spend hashing in seconds\n datalength: Length of the random data to encrypt\n\n Returns:\n bytes: An encrypted hash suitable for storage and later verification\n \"\"\"\n return scrypt.encrypt(os.urandom(datalength), password, maxtime=maxtime)\n\n def verify_password(hashed_password, guessed_password, maxtime=0.5):\n \"\"\"Verify a password against its hash with better error handling.\n\n Args:\n hashed_password: The stored password hash from hash_password()\n guessed_password: The password to verify\n maxtime: Maximum time to spend in verification\n\n Returns:\n tuple: (is_valid, status_code) where:\n - is_valid: True if password is correct, False otherwise\n - status_code: One of \"correct\", \"wrong_password\", \"time_limit_exceeded\",\n \"memory_limit_exceeded\", or \"error\"\n\n Raises:\n scrypt.error: Only raised for resource limit errors, which you may want to\n handle by retrying with higher limits or force=True\n \"\"\"\n try:\n scrypt.decrypt(hashed_password, guessed_password, maxtime, encoding=None)\n return True, \"correct\"\n except scrypt.error as e:\n # Check the specific error message to differentiate between causes\n error_message = str(e)\n if error_message == \"password is incorrect\":\n # Wrong password was provided\n return False, \"wrong_password\"\n elif error_message == \"decrypting file would take too long\":\n # Time limit exceeded\n raise # Re-raise so caller can handle appropriately\n elif error_message == \"decrypting file would take too much memory\":\n # Memory limit exceeded\n raise # Re-raise so caller can handle appropriately\n else:\n # Some other error occurred (corrupted data, etc.)\n return False, \"error\"\n\n # Example usage:\n\n # Create a hash of a password\n stored_hash = hash_password(\"correct_password\", maxtime=0.1)\n\n # Verify with correct password\n is_valid, status = verify_password(stored_hash, \"correct_password\", maxtime=0.1)\n if is_valid:\n print(\"Password is correct!\") # This will be printed\n\n # Verify with wrong password\n is_valid, status = verify_password(stored_hash, \"wrong_password\", maxtime=0.1)\n if not is_valid:\n if status == \"wrong_password\":\n print(\"Password is incorrect!\") # This will be printed\n\n # Verify with insufficient time\n try:\n # Set maxtime very low to trigger a time limit error\n is_valid, status = verify_password(stored_hash, \"correct_password\", maxtime=0.00001)\n except scrypt.error as e:\n if \"would take too long\" in str(e):\n print(\"Time limit exceeded, try with higher maxtime or force=True\")\n\n # Retry with force=True\n result = scrypt.decrypt(stored_hash, \"correct_password\", maxtime=0.00001, force=True, encoding=None)\n print(\"Forced decryption successful!\")\n\nThe `encrypt` function accepts several parameters to control its behavior::\n\n encrypt(input, password, maxtime=5.0, maxmem=0, maxmemfrac=0.5, logN=0, r=0, p=0, force=False, verbose=False)\n\nWhere:\n - `input`: Data to encrypt (bytes or str)\n - `password`: Password for encryption (bytes or str)\n - `maxtime`: Maximum time to spend in seconds\n - `maxmem`: Maximum memory to use in bytes (0 for unlimited)\n - `maxmemfrac`: Maximum fraction of available memory to use (0.0 to 1.0)\n - `logN`, `r`, `p`: Parameters controlling the scrypt key derivation function\n - If all three are zero (default), optimal parameters are chosen automatically\n - If provided, all three must be non-zero and will be used explicitly\n - `force`: If True, do not check whether encryption will exceed the estimated memory or time\n - `verbose`: If True, display parameter information\n\nThe `decrypt` function has a simpler interface::\n\n decrypt(input, password, maxtime=300.0, maxmem=0, maxmemfrac=0.5, encoding='utf-8', verbose=False, force=False)\n\nWhere:\n - `input`: Encrypted data (bytes or str)\n - `password`: Password for decryption (bytes or str)\n - `maxtime`: Maximum time to spend in seconds\n - `maxmem`: Maximum memory to use in bytes (0 for unlimited)\n - `maxmemfrac`: Maximum fraction of available memory to use\n - `encoding`: Encoding to use for output string (None for raw bytes)\n - `verbose`: If True, display parameter information\n - `force`: If True, do not check whether decryption will exceed the estimated memory or time\n\n\nBut, if you want output that is deterministic and constant in size,\nyou can use the ``hash`` function::\n\n >>> import scrypt\n >>> h1 = scrypt.hash('password', 'random salt')\n >>> len(h1) # The hash will be 64 bytes by default, but is overridable.\n 64\n >>> h1[:10]\n '\\xfe\\x87\\xf3hS\\tUo\\xcd\\xc8'\n >>> h2 = scrypt.hash('password', 'random salt')\n >>> h1 == h2 # The hash function is deterministic\n True\n\nThe `hash` function accepts the following parameters::\n\n hash(password, salt, N=1<<14, r=8, p=1, buflen=64)\n\nWhere:\n - `password`: The password to hash (bytes or str)\n - `salt`: Salt for the hash (bytes or str)\n - `N`: CPU/memory cost parameter (must be a power of 2)\n - `r`: Block size parameter\n - `p`: Parallelization parameter\n - `buflen`: Output buffer length\n\nThe parameters r, p, and buflen must satisfy r * p < 2^30 and\nbuflen <= (2^32 - 1) * 32. The parameter N must be a power of 2\ngreater than 1. N, r, and p must all be positive.\n\nFor advanced usage, the library also provides two utility functions:\n\n- `pickparams(maxmem=0, maxmemfrac=0.5, maxtime=5.0, verbose=0)`:\n Automatically chooses optimal scrypt parameters based on system resources.\n Returns (logN, r, p) tuple.\n\n- `checkparams(logN, r, p, maxmem=0, maxmemfrac=0.5, maxtime=5.0, verbose=0, force=0)`:\n Verifies that the provided parameters are valid and within resource limits.\n\n\nAcknowledgements\n================\n\nScrypt_ was created by Colin Percival and is licensed as 2-clause BSD.\nSince scrypt does not normally build as a shared library, I have included\nthe source for the currently latest version of the library in this\nrepository. When a new version arrives, I will update these sources.\n\n`Kelvin Wong`_ on Bitbucket provided changes to make the library\navailable on Mac OS X 10.6 and earlier, as well as changes to make the\nlibrary work more like the command-line version of scrypt by\ndefault. Kelvin also contributed with the unit tests, lots of cross\nplatform testing and work on the ``hash`` function.\n\nBurstaholic_ on Bitbucket provided the necessary changes to make\nthe library build on Windows.\n\nThe `python-appveyor-demo`_ repository for setting up automated Windows\nbuilds for a multitude of Python versions.\n\nLicense\n=======\n\nThis library is licensed under the same license as scrypt; 2-clause BSD.\n\n.. _scrypt: http://www.tarsnap.com/scrypt.html\n.. _Python: http://python.org\n.. _Burstaholic: https://bitbucket.org/Burstaholic\n.. _Kelvin Wong: https://bitbucket.org/kelvinwong_ca\n.. _python-appveyor-demo: https://github.com/ogrisel/python-appveyor-demo\n.. _Anaconda: https://www.continuum.io\n",
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