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size_t data_len, unsigned N, core_t *core);
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This function performs key derivation according to an old version of
the PKCS#5 standard (v1.5) or `RFC2898
`_.
Args:
password (string):
The secret password to generate the key from.
salt (byte string):
An 8 byte string to use for better protection from dictionary attacks.
This value does not need to be kept secret, but it should be randomly
chosen for each derivation.
dkLen (integer):
The length of the desired key. The default is 16 bytes, suitable for
instance for :mod:`Crypto.Cipher.AES`.
count (integer):
The number of iterations to carry out. The recommendation is 1000 or
more.
hashAlgo (module):
The hash algorithm to use, as a module or an object from the :mod:`Crypto.Hash` package.
The digest length must be no shorter than ``dkLen``.
The default algorithm is :mod:`Crypto.Hash.SHA1`.
Return:
A byte string of length ``dkLen`` that can be used as key.
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}t | |k |d| S ) a Derive one or more keys from a password (or passphrase).
This function performs key derivation according to the PKCS#5 standard (v2.0).
Args:
password (string or byte string):
The secret password to generate the key from.
Strings will be encoded as ISO 8859-1 (also known as Latin-1),
which does not allow any characters with codepoints > 255.
salt (string or byte string):
A (byte) string to use for better protection from dictionary attacks.
This value does not need to be kept secret, but it should be randomly
chosen for each derivation. It is recommended to use at least 16 bytes.
Strings will be encoded as ISO 8859-1 (also known as Latin-1),
which does not allow any characters with codepoints > 255.
dkLen (integer):
The cumulative length of the keys to produce.
Due to a flaw in the PBKDF2 design, you should not request more bytes
than the ``prf`` can output. For instance, ``dkLen`` should not exceed
20 bytes in combination with ``HMAC-SHA1``.
count (integer):
The number of iterations to carry out. The higher the value, the slower
and the more secure the function becomes.
You should find the maximum number of iterations that keeps the
key derivation still acceptable on the slowest hardware you must support.
Although the default value is 1000, **it is recommended to use at least
1000000 (1 million) iterations**.
prf (callable):
A pseudorandom function. It must be a function that returns a
pseudorandom byte string from two parameters: a secret and a salt.
The slower the algorithm, the more secure the derivation function.
If not specified, **HMAC-SHA1** is used.
hmac_hash_module (module):
A module from ``Crypto.Hash`` implementing a Merkle-Damgard cryptographic
hash, which PBKDF2 must use in combination with HMAC.
This parameter is mutually exclusive with ``prf``.
Return:
A byte string of length ``dkLen`` that can be used as key material.
If you want multiple keys, just break up this string into segments of the desired length.
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Args:
password (string):
The secret pass phrase to generate the keys from.
salt (string):
A string to use for better protection from dictionary attacks.
This value does not need to be kept secret,
but it should be randomly chosen for each derivation.
It is recommended to be at least 16 bytes long.
key_len (integer):
The length in bytes of each derived key.
N (integer):
CPU/Memory cost parameter. It must be a power of 2 and less
than :math:`2^{32}`.
r (integer):
Block size parameter.
p (integer):
Parallelization parameter.
It must be no greater than :math:`(2^{32}-1)/(4r)`.
num_keys (integer):
The number of keys to derive. Every key is :data:`key_len` bytes long.
By default, only 1 key is generated.
The maximum cumulative length of all keys is :math:`(2^{32}-1)*32`
(that is, 128TB).
A good choice of parameters *(N, r , p)* was suggested
by Colin Percival in his `presentation in 2009`__:
- *( 2¹⁴, 8, 1 )* for interactive logins (≤100ms)
- *( 2²⁰, 8, 1 )* for file encryption (≤5s)
Return:
A byte string or a tuple of byte strings.
.. __: http://www.tarsnap.com/scrypt/scrypt-slides.pdf
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Args:
password (byte string or string):
The secret password or pass phrase.
It must be at most 72 bytes long.
It must not contain the zero byte.
Unicode strings will be encoded as UTF-8.
cost (integer):
The exponential factor that makes it slower to compute the hash.
It must be in the range 4 to 31.
A value of at least 12 is recommended.
salt (byte string):
Optional. Random byte string to thwarts dictionary and rainbow table
attacks. It must be 16 bytes long.
If not passed, a random value is generated.
Return (byte string):
The bcrypt hash
Raises:
ValueError: if password is longer than 72 bytes or if it contains the zero byte
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Args:
password (byte string or string):
The secret password or pass phrase to test.
It must be at most 72 bytes long.
It must not contain the zero byte.
Unicode strings will be encoded as UTF-8.
bcrypt_hash (byte string, bytearray):
The reference bcrypt hash the password needs to be checked against.
Raises:
ValueError: if the password does not match
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a pseudorandom function in Counter Mode, as specified in
`NIST SP 800-108r1 `_.
Args:
master (byte string):
The secret value used by the KDF to derive the other keys.
It must not be a password.
The length on the secret must be consistent with the input expected by
the :data:`prf` function.
key_len (integer):
The length in bytes of each derived key.
prf (function):
A pseudorandom function that takes two byte strings as parameters:
the secret and an input. It returns another byte string.
num_keys (integer):
The number of keys to derive. Every key is :data:`key_len` bytes long.
By default, only 1 key is derived.
label (byte string):
Optional description of the purpose of the derived keys.
It must not contain zero bytes.
context (byte string):
Optional information pertaining to
the protocol that uses the keys, such as the identity of the
participants, nonces, session IDs, etc.
It must not contain zero bytes.
Return:
- a byte string (if ``num_keys`` is not specified), or
- a tuple of byte strings (if ``num_key`` is specified).
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