zg 0 , d Z dgZddlmZ ddlmZmZ ddlmZ ddl m
Z
m Z ddl m
Z
ddlmZ dd lmZmZmZmZmZmZmZ dd
lmZ d Zd Zd
Z e Z d Z e Z G d de Z d Z! e!dd Z" G d de Z#d Z$dS )z
Galois/Counter Mode (GCM).
GcmMode ) unhexlify)bord _copy_bytes) is_buffer)
long_to_bytes
bytes_to_long)BLAKE2s)get_random_bytes)load_pycryptodome_raw_lib VoidPointercreate_string_bufferget_raw_buffer SmartPointerc_size_t c_uint8_ptr)
_cpu_featuresa`
int ghash_%imp%(uint8_t y_out[16],
const uint8_t block_data[],
size_t len,
const uint8_t y_in[16],
const void *exp_key);
int ghash_expand_%imp%(const uint8_t h[16],
void **ghash_tables);
int ghash_destroy_%imp%(void *ghash_tables);
c ddl m} d} |d| } fd|D }n# t $ r d gdz }Y nw xY wt t || } |di |S )Nr )
namedtuple)ghash ghash_expand
ghash_destroy
_GHash_Impc < g | ]}t |d z z S )_)getattr).0xlibpostfixs y/builddir/build/BUILD/imunify360-venv-2.6.2/opt/imunify360/venv/lib64/python3.11/site-packages/Crypto/Cipher/_mode_gcm.py
z _build_impl..H s, FFF!gc1s7W#455FFF ) collectionsr AttributeErrordictzip)r r r funcs GHASH_Imp imp_funcsparamss `` r! _build_implr. B s &&&&&& 8E
<//I!FFFFFuFFF ! ! !HqL !
#eY''
(
(F 9 v s ( ;;c | t dd } t d| }t |d }|S )N%imp%portablezCrypto.Hash._ghash_portable)_ghash_api_templatereplacer r. apir results r! _get_ghash_portabler7 O s;
%
%gz
:
:C
#$A3
G
GC
j
)
)F Mr# c t j sdS t dd } t d| }t |d }n# t $ r d}Y nw xY w|S )z4Return None if CLMUL implementation is not availableNr0 clmulzCrypto.Hash._ghash_clmul)r
have_clmulr2 r3 r r. OSErrorr4 s r! _get_ghash_clmulr< W s~ # % % t!))'7;;'(BCHH S'** Ms ;A A"!A"c $ e Zd ZdZd Zd Zd ZdS )_GHASHa GHASH function defined in NIST SP 800-38D, Algorithm 2.
If X_1, X_2, .. X_m are the blocks of input data, the function
computes:
X_1*H^{m} + X_2*H^{m-1} + ... + X_m*H
in the Galois field GF(2^256) using the reducing polynomial
(x^128 + x^7 + x^2 + x + 1).
c t | dk sJ || _ t | _ | t | | j }|rt d|z t | j |j
| _ t d | _ d S )N z&Error %d while expanding the GHASH key)
lenghash_cr
_exp_keyr r
address_of
ValueErrorr getr r _last_y)selfsubkeyrB r6 s r! __init__z_GHASH.__init__r s 6{{b #
%%k&&9&9&*m&>&>&@&@B B P E NOO O$T]%6%6%8%8%,%:< <
,B// r# c * t | dz dk sJ | j | j t | t t | | j | j }|rt d|z | S )Nr@ r z Error %d while updating GHASH) rA rB r rG r r rC rF rE )rH
block_datar6 s r! updatez
_GHASH.update s :#q(((( ##DL$/
$;$;$,S__$=$=$(L$(M$5$5$7$7 9 9
G r> f sK 0 0 0" , , , , ,r# r> c $ t dd| S )NEnumr% )type)enumss r! enumrZ s E " ""r# )PROCESSING_AUTH_DATAPROCESSING_CIPHERTEXTc h e Zd ZdZd Zd Zd Zd ZddZddZ d Z
d
Z d Z d Z
d
ZddZddZdS )r a Galois Counter Mode (GCM).
This is an Authenticated Encryption with Associated Data (`AEAD`_) mode.
It provides both confidentiality and authenticity.
The header of the message may be left in the clear, if needed, and it will
still be subject to authentication. The decryption step tells the receiver
if the message comes from a source that really knowns the secret key.
Additionally, decryption detects if any part of the message - including the
header - has been modified or corrupted.
This mode requires a *nonce*.
This mode is only available for ciphers that operate on 128 bits blocks
(e.g. AES but not TDES).
See `NIST SP800-38D`_.
.. _`NIST SP800-38D`: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
.. _AEAD: http://blog.cryptographyengineering.com/2012/05/how-to-choose-authenticated-encryption.html
:undocumented: __init__
c |j | _ | j dk rt d t | dk rt d t | st d t | dk rt d t d d | | _ || _ t d d | | _ d | _ || _
d|cxk rdk sn t d g d
| _ d | _ d| _
d| _ |j || j j fi | d }t | j d
k r | j dz }ndt | j dz z
dz dz } | j d| z z t% dt | j z d z }
t' || |
}|d d
} t- | dz dz } |j || j j f| | d|| _ t' || | _ |j || j j f|dd|| _ d| _ t8 j | _ d S )Nr@ zFGCM mode is only available for ciphers that operate on 128 bits blocksr zNonce cannot be emptyz,Nonce must be bytes, bytearray or memoryview z Nonce exceeds maximum length z.Parameter 'mac_len' must be in the range 4..16rM encryptdecryptrQ verifyFs s r[ l )
initial_valuenoncer# )
block_sizerE rA r TypeErrorr rk _factory_key_tag_mac_len_next_no_more_assoc_data _auth_len_msg_lennewMODE_ECBrd r r> rM rQ r MODE_CTR_cipher_signer _tag_cipher_cache MacStatusr] _status)
rH factorykeyrk mac_len
cipher_paramsrB hash_subkeyj0fillghash_in nonce_ctriv_ctrs
r! rJ zGcmMode.__init__ s !, ?b @ A A
A u::?? 455 5 L JKK K u:: ! ! ;<< < !tU33
dC00
W"""""""" MNN N* * *
$)
"gk#"&-"8$ $$1$ $ %,GL$9$9 tz??b 11BB#dj//B./259D
$'%a#dj//&91==>H W--44X>>EEGGB ssG ##a':5"w{3#'=#9417)24 4 &3 4 4 k733 '7;s'+}'= 857-0 8 8 *7 8 8 5 r# c d| j vrt d g d| _ | | | xj t | z
c_ | j dk rt d | S )ax Protect associated data
If there is any associated data, the caller has to invoke
this function one or more times, before using
``decrypt`` or ``encrypt``.
By *associated data* it is meant any data (e.g. packet headers) that
will not be encrypted and will be transmitted in the clear.
However, the receiver is still able to detect any modification to it.
In GCM, the *associated data* is also called
*additional authenticated data* (AAD).
If there is no associated data, this method must not be called.
The caller may split associated data in segments of any size, and
invoke this method multiple times, each time with the next segment.
:Parameters:
assoc_data : bytes/bytearray/memoryview
A piece of associated data. There are no restrictions on its size.
rM zI % % STT T r# c J t | j dk sJ t | j dk rt dt | j z
t | }| xj t d || z
c_ ||d }t | j dk rd S | j | j d| _ t | dz dz }t |d | | _ |dk r$| j |d | d S d S )Nr@ r r# )rA r| minr rz rM )rH datafiller
update_lens r! r zGcmMode._update- s 4; "$$$$ t{ a c$+ . ..D ::F KK;tVT:: :KK=D4; "$$
L , , , DKYY"_r)
!*dD99 >> L [j[ 1 2 2 2 2 2 >r# c t | j dk sJ t | j }|dk r | dd|z
z d S d S )Nr@ r ri )rA r| r )rH len_caches r! _pad_cache_and_updatez GcmMode._pad_cache_and_updateA s_ 4; "$$$$ $$ q== LLBN3 4 4 4 4 4 =r# Nc d| j vrt d ddg| _ | j || }| j t
j k r%| t
j | _ | ||n| | xj
t | z
c_
| j
dk rt d |S )a Encrypt data with the key and the parameters set at initialization.
A cipher object is stateful: once you have encrypted a message
you cannot encrypt (or decrypt) another message using the same
object.
The data to encrypt can be broken up in two or
more pieces and `encrypt` can be called multiple times.
That is, the statement:
>>> c.encrypt(a) + c.encrypt(b)
is equivalent to:
>>> c.encrypt(a+b)
This function does not add any padding to the plaintext.
:Parameters:
plaintext : bytes/bytearray/memoryview
The piece of data to encrypt.
It can be of any length.
:Keywords:
output : bytearray/memoryview
The location where the ciphertext must be written to.
If ``None``, the ciphertext is returned.
:Return:
If ``output`` is ``None``, the ciphertext as ``bytes``.
Otherwise, ``None``.
rd z@encrypt() can only be called after initialization or an update()rQ outputNl z Plaintext exceeds maximum length)
rr rm ry rd r~ r} r] r r^ r ru rA rE )rH plaintextr
ciphertexts r! rd zGcmMode.encryptN s B DJ & & = > >
> *
\)))F)CC
<99 9 9 & & ( ( ($:DL 6>ZZv>>>
Y '
=; & & ?@@ @r# c T d| j vrt d ddg| _ | j t j k r%| t j | _ | | | xj t | z
c_ | j
|| S )a Decrypt data with the key and the parameters set at initialization.
A cipher object is stateful: once you have decrypted a message
you cannot decrypt (or encrypt) another message with the same
object.
The data to decrypt can be broken up in two or
more pieces and `decrypt` can be called multiple times.
That is, the statement:
>>> c.decrypt(a) + c.decrypt(b)
is equivalent to:
>>> c.decrypt(a+b)
This function does not remove any padding from the plaintext.
:Parameters:
ciphertext : bytes/bytearray/memoryview
The piece of data to decrypt.
It can be of any length.
:Keywords:
output : bytearray/memoryview
The location where the plaintext must be written to.
If ``None``, the plaintext is returned.
:Return:
If ``output`` is ``None``, the plaintext as ``bytes``.
Otherwise, ``None``.
re z@decrypt() can only be called after initialization or an update()rf r ) rr rm r~ r} r] r r^ r ru rA ry re )rH r r s r! re zGcmMode.decrypt s B DJ & & C D D
D *
<99 9 9 & & ( ( ($:DL Z
Z (
|##Jv#>>>r# c j d| j vrt d dg| _ | S )a
Compute the *binary* MAC tag in an AEAD mode.
The caller invokes this function at the very end.
This method returns the MAC that shall be sent to the receiver,
together with the ciphertext.
:Return: the MAC, as a byte string.
rQ zAdigest() cannot be called when decrypting or validating a message)rr rm _compute_macrP s r! rQ zGcmMode.digest sC 4: % % 7 8 8
8 Z
"""r# c | j r| j S | | t d| j z d | t d| j z d | j }| j | d| j
| _ | j S )z#Compute MAC without any FSM checks.rh N) rp r r r rt ru rz rQ r{ rd rq )rH s_tags r! r zGcmMode._compute_mac s 9 9
""$$$ ]1t~#5q99::: ]1t}#4a88999 ##%% $,,U33NT]NC yr# c d d d | D S )zCompute the *printable* MAC tag.
This method is like `digest`.
:Return: the MAC, as a hexadecimal string.
c 2 g | ]}d t | z S )z%02x)r )r r s r! r" z%GcmMode.hexdigest.. s# @@@Qa(@@@r# )joinrQ rP s r! hexdigestzGcmMode.hexdigest s- ww@@$++--@@@AAAr# c V d| j vrt d dg| _ t d }t j d|| }t j d|| }| | k rt d dS )a( Validate the *binary* MAC tag.
The caller invokes this function at the very end.
This method checks if the decrypted message is indeed valid
(that is, if the key is correct) and it has not been
tampered with while in transit.
:Parameters:
received_mac_tag : bytes/bytearray/memoryview
This is the *binary* MAC, as received from the sender.
:Raises ValueError:
if the MAC does not match. The message has been tampered with
or the key is incorrect.
rf z3verify() cannot be called when encrypting a messager@ ) digest_bitsr r zMAC check failedN)rr rm r r
rv r rQ rE )rH received_mac_tagsecretmac1mac2s r! rf zGcmMode.verify s " 4: % % 9 : :
: Z
!"%%{s $ 1 1 3 35 5 5{s 02 2 2 ;;==DKKMM ) ) /00 0 * )r# c J | t | dS )aW Validate the *printable* MAC tag.
This method is like `verify`.
:Parameters:
hex_mac_tag : string
This is the *printable* MAC, as received from the sender.
:Raises ValueError:
if the MAC does not match. The message has been tampered with
or the key is incorrect.
N)rf r )rH hex_mac_tags r! hexverifyzGcmMode.hexverify s$
Ik**+++++r# c X | || | fS )a\ Perform encrypt() and digest() in one step.
:Parameters:
plaintext : bytes/bytearray/memoryview
The piece of data to encrypt.
:Keywords:
output : bytearray/memoryview
The location where the ciphertext must be written to.
If ``None``, the ciphertext is returned.
:Return:
a tuple with two items:
- the ciphertext, as ``bytes``
- the MAC tag, as ``bytes``
The first item becomes ``None`` when the ``output`` parameter
specified a location for the result.
r )rd rQ )rH r r s r! encrypt_and_digestzGcmMode.encrypt_and_digest
s' ( ||If|55t{{}}DDr# c ^ | || }| | |S )a Perform decrypt() and verify() in one step.
:Parameters:
ciphertext : bytes/bytearray/memoryview
The piece of data to decrypt.
received_mac_tag : byte string
This is the *binary* MAC, as received from the sender.
:Keywords:
output : bytearray/memoryview
The location where the plaintext must be written to.
If ``None``, the plaintext is returned.
:Return: the plaintext as ``bytes`` or ``None`` when the ``output``
parameter specified a location for the result.
:Raises ValueError:
if the MAC does not match. The message has been tampered with
or the key is incorrect.
r )re rf )rH r r r r s r! decrypt_and_verifyzGcmMode.decrypt_and_verify# s2 & LLFL;; $%%%r# rO )rR rS rT rU rJ rM r r rd re rQ r r rf r r r r% r# r! r r s 0P6 P6 P6d% % %N3 3 3( 5 5 53 3 3 3j-? -? -? -?^# # #$ "B B B 1 1 1@
,
,
, E E E E, r# c | d }n1# t $ r$}t dt | z d}~ww xY w| dd }|t d }| dd }| dd }|rt
rt
}nt }t | ||||| S ) a! Create a new block cipher, configured in Galois Counter Mode (GCM).
:Parameters:
factory : module
A block cipher module, taken from `Crypto.Cipher`.
The cipher must have block length of 16 bytes.
GCM has been only defined for `Crypto.Cipher.AES`.
:Keywords:
key : bytes/bytearray/memoryview
The secret key to use in the symmetric cipher.
It must be 16 (e.g. *AES-128*), 24 (e.g. *AES-192*)
or 32 (e.g. *AES-256*) bytes long.
nonce : bytes/bytearray/memoryview
A value that must never be reused for any other encryption.
There are no restrictions on its length,
but it is recommended to use at least 16 bytes.
The nonce shall never repeat for two
different messages encrypted with the same key,
but it does not need to be random.
If not provided, a 16 byte nonce will be randomly created.
mac_len : integer
Length of the MAC, in bytes.
It must be no larger than 16 bytes (which is the default).
r zMissing parameter:Nrk r@ r use_clmulT)popKeyErrorrm strr _ghash_clmul_ghash_portabler )r kwargsr erk r r rB s r! _create_gcm_cipherr ; s @7jj 7 7 7,s1vv56667
JJw % %E } $$jjB''G
;--I "\ " ! 7C A AAs
A AAN)%rU __all__binasciir Crypto.Util.py3compatr r Crypto.Util._raw_apir Crypto.Util.numberr r Crypto.Hashr
Crypto.Randomr r r
r r r r r Crypto.Utilr r2 r. r7 r r< r objectr> rZ r} r r r% r# r! r s > + 3 3 3 3 3 3 3 3 * * * * * * ; ; ; ; ; ; ; ; * * * * * *G G G G G G G G G G G G G G G G G G & % % % % %
&%'' !! +, +, +, +, +,V +, +, +,\# # #
Daq A A A ] ] ] ] ]f ] ] ]@
1B 1B 1B 1B 1Br#