GIF89a=( õ' 7IAXKgNgYvYx\%wh…hŽth%ˆs%—x¨}9®Œ©€&©‰%¶†(¹–.¹5·œD¹&Çš)ÇŸ5ǘ;Í£*È¡&Õ²)ׯ7×µ<Ñ»4ï°3ø‘HÖ§KͯT÷¨Yÿšqÿ»qÿÔFØ !ù ' !ÿ NETSCAPE2.0 , =( þÀ“pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§gª«ªE¯°¨¬ª±²Œ¹º¹E¾­”´ÂB¶¯ §Åȸ»ÑD¾¿Á•ÄÅ®° ÝH¾ÒLÀÆDÙ«D¶BÝïðÀ¾DÑÑÔTÌÍíH òGö¨A RÎڐ |¥ ٭&ºìE8œ¹kGÔAÞpx­a¶­ã R2XB®åE8I€Õ6Xî:vT)äžþÀq¦è³¥ì仕F~%xñ  4#ZÔ‰O|-4Bs‘X:= QÉ œš lºÒyXJŠGȦ|s hÏíK–3l7·B|¥$'7Jީܪ‰‡àá”Dæn=Pƒ ¤Òëí‰`䌨ljóá¯Éüv>á–Á¼5 ½.69ûϸd«­ºÀûnlv©‹ªîf{¬ÜãPbŸ  l5‘Ž¯pß ´ ˜3aÅùäI«O’ý·‘áÞ‡˜¾Æ‚ÙÏiÇÿ‹Àƒ #öó)pâš Þ½ ‘Ý{ó)vmÞü%D~ 6f s}ŃƒDØW Eþ`‡þ À…L8xá†ç˜{)x`X/> Ì}mø‚–RØ‘*|`D=‚Ø_ ^ð5 !_…'aä“OÚ—7âcð`D”Cx`ÝÂ¥ä‹éY¹—F¼¤¥Š?¡Õ™ n@`} lď’ÄÉ@4>ñd œ à‘vÒxNÃ×™@žd=ˆgsžG±æ ´²æud &p8Qñ)ˆ«lXD©øÜéAžHìySun jª×k*D¤LH] †¦§C™Jä–´Xb~ʪwStŽ6K,°£qÁœ:9ت:¨þªl¨@¡`‚ûÚ ».Û¬¯t‹ÆSÉ[:°=Š‹„‘Nåû”Ìî{¿ÂA ‡Rà›ÀÙ6úë°Ÿð0Ä_ ½;ÃϱîÉì^ÇÛÇ#Ëë¼ôº!±Ä˜íUîÅÇ;0L1óÁµö«p% AÀºU̬ݵ¼á%霼€‡¯Á~`ÏG¯»À× ­²± =4ªnpð3¾¤³¯­ü¾¦îuÙuµÙ®|%2ÊIÿür¦#0·ÔJ``8È@S@5ê¢ ö×Þ^`8EÜ]ý.뜃Âç 7 ú ȉÞj œ½Dç zý¸iþœÑÙûÄë!ˆÞÀl§Ïw‹*DçI€nEX¯¬¼ &A¬Go¼QföõFç°¯;é¦÷îŽêJ°îúôF5¡ÌQ|îúöXªæ»TÁÏyñêï]ê² o óÎC=öõ›ÒÓPB@ D×½œä(>èCÂxŽ`±«Ÿ–JЀ»Û á¤±p+eE0`ëŽ`A Ú/NE€Ø†À9‚@¤à H½7”à‡%B‰`Àl*ƒó‘–‡8 2ñ%¸ —€:Ù1Á‰E¸àux%nP1ð!‘ðC)¾P81lÑɸF#ˆ€{´âé°ÈB„0>±û °b¡Š´±O‚3È–Ù()yRpbµ¨E.Z‘D8ÊH@% òŒx+%Ù˜Æcü »¸˜fõ¬b·d`Fê™8èXH"ÉÈ-±|1Ô6iI, 2““¬$+](A*jÐ QTÂo‰.ÛU슬Œã„Ž`¯SN¡–¶Äåyše¯ª’­¬‚´b¦Éož œ)åyâ@Ì®3 ÎtT̉°&Ø+žLÀf"Ø-|žçÔ>‡Ðv¦Ðžì\‚ Q1)Ž@Žh#aP72”ˆ™¨$‚ !ù " , =( …7IAXG]KgNgYvYxR"k\%w]'}hŽth%ˆg+ˆs%—r.—m3šx3˜x¨}9®€&©€+¨‡7§‰%¶†(¹–.¹œD¹&ǘ;Í•&ײ)×»4ïÌ6ò§KÍ þ@‘pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g «¬ E ±± ¨­¶°ººE Á´”·®C¬²§Ç¶Œ»ÓDÃÕƷ¯Ê±H½ºM×ÁGÚ¬D¶BËÁ½î½DÓôTÏÛßîG»ôõC×CÌ l&âž:'òtU³6ɹ#·Ø)€'Ü.6±&ëÍÈ» K(8p0N?!æ2"ÛˆNIJX>R¼ÐO‚M '¡¨2¸*Ÿþ>#n↠å@‚<[:¡Iïf’ ¤TÚ˘CdbÜÙ“[«ŽEú5MBo¤×@€`@„€Êt W-3 ¶Ÿ¡BíêäjIÝ…Eò9[T…$íêﯧ„…•s»Óȳ¹€ÅÚdc®UUρ#±Ùïldj?´í¼²`\ŽÁðÞu|3'ÖŒ]ë6 ¶S#²‡˜FKLÈ *N E´‘áäŠ$˜›eÄYD„ºq«.è촁ƒs \-ÔjA 9²õ÷å- üúM[Âx(ís÷ì®x€|í¡Ù’p¦‚ ŽkÛTÇDpE@WÜ ²Ç]kŠ1¨ þ€·Yb ÓÁ‰l°*n0 ç™—žzBdОu¾7ĉBl€â‰-ºx~|UåU‰  h*Hœ|e"#"?vpÄiŠe6^ˆ„+qâŠm8 #VÇá ‘å–ÄV„œ|Šè•m"сœn|@›U¶ÆΞ—Špb¥G¨ED”€±Úê2FÌIç? >Éxå Œ± ¡¤„%‘žjŸ‘ꄯ<Ìaà9ijÐ2˜D¦È&›†Z`‚å]wþ¼Â:ç6àB¤7eFJ|õÒ§Õ,¨äàFÇ®cS·Ê¶+B°,‘Þ˜ºNûãØ>PADÌHD¹æž«ÄÀnÌ¥}­#Ë’ë QÀÉSÌÂÇ2ÌXÀ{æk²lQÁ2«ÊðÀ¯w|2Í h‹ÄÂG€,m¾¶ë3ÐÙ6-´ÅE¬L°ÆIij*K½ÀÇqï`DwVÍQXœÚÔpeœ±¬Ñ q˜§Tœ½µƒ°Œìu Â<¶aØ*At¯lmEØ ü ôÛN[P1ÔÛ¦­±$ÜÆ@`ùåDpy¶yXvCAyåB`ŽD¶ 0QwG#¯ æš[^Äþ $ÀÓÝǦ{„L™[±úKÄgÌ;ï£S~¹ìGX.ôgoT.»åˆ°ùŸûù¡?1zö¦Ÿž:ÅgÁ|ìL¹ „®£œŠ‚à0œ]PÁ^p F<"•ç?!,ñ‡N4—…PÄ Á„ö¨Û:Tè@hÀ‹%táÿ:ø-žI<`þ‹p I….)^ 40D#p@ƒj4–؀:²‰1Øâr˜¼F2oW¼#Z†;$Q q” ‘ ÂK¦ñNl#29 !’F@¥Bh·ᏀL!—XFóLH‘Kh¤.«hE&JòG¨¥<™WN!€ÑÙÚˆY„@†>Œž19J" 2,/ &.GXB%ÌRÈ9B6¹W]’î×ÔW¥’IÎ$ ñ‹ÓŒE8YÆ ¼³™ñA5“à®Q.aŸB€&Ø©³ JÁ—! ¦t)K%tœ-¦JF bòNMxLôþ)ÐR¸Ð™‘ èÝ6‘O!THÌ„HÛ ‰ !ù ) , =( …AXKgNgYvYxR"k\%wh…hŽh%ˆg+ˆs%—r.—x3˜x¨}9®€&©€+¨Œ,©‡7§‰%¶†(¹–.¹5·&Çš)ǘ;Í•&×£*Ȳ)ׯ7×»4ï°3øÌ6ò‘HÖ§KÍ»Hó¯T÷¨Yÿ»qÿÇhÿ þÀ”pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g ª« E$±²¨ª­ · °²½$E$ÂÕ««D· Í ¿¦Ç¶¸ÌŒ¾³CÃÅÆ E ééH½MÛÂGâªD­ çBêêϾD²ÒaÀà€Š1r­ðÓ¤ ÔožzU!L˜C'¾yW½UGtäÇïÙllê0×àÂuGþ)AÀs[þ·xì ÁxO%ƒûX2ó—  P£n›R/¡ÑšHše+êDm?# —‘Ç£6¡8íJ¡ŸâDiäªM¥Ö„ôj“¬¹£5oQ7°- <‡ *´lãÓŒ2r/a!l)dÈ A™ÈE¢ôÔ͆…ð ;Ö˜c ¡%ß‚’Ùˆâ¸b½—pe~C"BíëÚHïeF2§æŠ8qb t_`urŠeü wÅu3êæPv§h•"ß`íÍxçLĹÜÖ3á  ~Öº“®›¸ÏMDfJÙ °„ÛµáWõ%§œ‚à©–‚X Ó؁)@®Ñ›Eþ´wëuÅSxb8y\mÖzœ¥§ZbºE—ÂLªÌw!y(>¡™wú=Ç|ÅÝs¢d €CÁW)HÜcC$€L Ä7„r.á\{)@ð` @ äXÈ$PD” `šaG:§æˆOˆ72EÐamn]ù"ŒcÊxÑŒ° &dR8`g«iÙŸLR!¦P …d’ä¡“¦ðÎTƒ¦ià|À _ ¥ Qi#¦Šg›Æ ›noMµ ›V ã£)p ç£ÎW…š=Âeªk§†j„ ´®1ß²sÉxéW«jšl|0¯B0Û, \jÛ´›6±¬¶C ÛíWþï|ëÙ‹¸ñzĸV {ì;Ýñn¼òVˆm³I¼³.Ðã¤PN¥ ²µ¼„µCã+¹ÍByî£Ñ¾HŸ›ëê 7ìYÆFTk¨SaoaY$Dµœìï¿Ã29RÈkt Çïfñ ÇÒ:ÀÐSp¹3ÇI¨â¥DZÄ ü9Ïýögñ½­uÔ*3)O‘˜Ö[_hv ,àî×Et Ÿé¶BH€ Õ[ü±64M@ÔSÌM7dÐl5-ÄÙU܍´©zߌ3Ô€3ž„ „ ¶ÛPô½5×g› êÚ˜kN„Ý…0Îj4€Ìë°“#{þÕ3S2çKÜ'ợlø¼Ú2K{° {Û¶?žm𸧠ËI¼nEò='êüóºè^üæÃ_Û=°óž‚ì#Oý¿Í'¡½áo..ÏYìnüñCœO±Áa¿¢Kô½o,üÄËbö²çºíï{ËC Ú— "”Ï{ËK ÍÒw„õ±Oz dÕ¨à:$ ƒô—«v»] A#ð «€¿šéz)Rx׿ˆ¥‚d``èw-îyÏf×K!ð€þ­Ð|ìPľ„=Ì`ý(f” 'Pa ¥ÐBJa%Ðâf§„%Š¡}FàáÝ×6>ÉäŠG"éŽè=ø!oŠ°^FP¼Ø©Q„ÀCÙÁ`(Ž\ÄÝ® ©Â$<n@dÄ E#ììUÒI! ‚#lù‹`k¦ÐÇ'Rró’ZýNBÈMF Í[¤+‹ðɈ-áwj¨¥þ8¾rá ,VÂh„"|½œ=×G_¦Ñ™EØ 0i*%̲˜Æda0mV‚k¾)›;„&6 p>ÓjK “¦Ç# âDÂ:ûc?:R Ó¬fÞéI-Ì“•Ã<ä=™Ï7˜3œ¨˜c2ŒW ,ˆ”8(T™P‰F¡Jhç"‚ ; 403WebShell
403Webshell
Server IP : 104.21.83.152  /  Your IP : 216.73.216.195
Web Server : LiteSpeed
System : Linux premium229.web-hosting.com 4.18.0-553.45.1.lve.el8.x86_64 #1 SMP Wed Mar 26 12:08:09 UTC 2025 x86_64
User : akhalid ( 749)
PHP Version : 8.3.22
Disable Function : NONE
MySQL : OFF  |  cURL : ON  |  WGET : ON  |  Perl : ON  |  Python : ON  |  Sudo : OFF  |  Pkexec : OFF
Directory :  /opt/imunify360/venv/lib/python3.11/site-packages/Crypto/IO/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :

[ Back ]     

Current File : /opt/imunify360/venv/lib/python3.11/site-packages/Crypto/IO/_PBES.py
#
#  PublicKey/_PBES.py : Password-Based Encryption functions
#
# ===================================================================
#
# Copyright (c) 2014, Legrandin <[email protected]>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================

from Crypto import Random
from Crypto.Util.asn1 import (
            DerSequence, DerOctetString,
            DerObjectId, DerInteger,
            )

from Crypto.Util.Padding import pad, unpad
from Crypto.Hash import MD5, SHA1, SHA224, SHA256, SHA384, SHA512
from Crypto.Cipher import DES, ARC2, DES3, AES
from Crypto.Protocol.KDF import PBKDF1, PBKDF2, scrypt

_OID_PBE_WITH_MD5_AND_DES_CBC = "1.2.840.113549.1.5.3"
_OID_PBE_WITH_MD5_AND_RC2_CBC = "1.2.840.113549.1.5.6"
_OID_PBE_WITH_SHA1_AND_DES_CBC = "1.2.840.113549.1.5.10"
_OID_PBE_WITH_SHA1_AND_RC2_CBC = "1.2.840.113549.1.5.11"

_OID_PBES2 = "1.2.840.113549.1.5.13"

_OID_PBKDF2 = "1.2.840.113549.1.5.12"
_OID_SCRYPT = "1.3.6.1.4.1.11591.4.11"

_OID_HMAC_SHA1 = "1.2.840.113549.2.7"
_OID_HMAC_SHA224 = "1.2.840.113549.2.8"
_OID_HMAC_SHA256 = "1.2.840.113549.2.9"
_OID_HMAC_SHA384 = "1.2.840.113549.2.10"
_OID_HMAC_SHA512 = "1.2.840.113549.2.11"

_OID_DES_EDE3_CBC = "1.2.840.113549.3.7"
_OID_AES128_CBC = "2.16.840.1.101.3.4.1.2"
_OID_AES192_CBC = "2.16.840.1.101.3.4.1.22"
_OID_AES256_CBC = "2.16.840.1.101.3.4.1.42"


class PbesError(ValueError):
    pass

# These are the ASN.1 definitions used by the PBES1/2 logic:
#
# EncryptedPrivateKeyInfo ::= SEQUENCE {
#   encryptionAlgorithm  EncryptionAlgorithmIdentifier,
#   encryptedData        EncryptedData
# }
#
# EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
#
# EncryptedData ::= OCTET STRING
#
# AlgorithmIdentifier  ::=  SEQUENCE  {
#       algorithm   OBJECT IDENTIFIER,
#       parameters  ANY DEFINED BY algorithm OPTIONAL
# }
#
# PBEParameter ::= SEQUENCE {
#       salt OCTET STRING (SIZE(8)),
#       iterationCount INTEGER
# }
#
# PBES2-params ::= SEQUENCE {
#       keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
#       encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
# }
#
# PBKDF2-params ::= SEQUENCE {
#   salt CHOICE {
#       specified OCTET STRING,
#       otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
#       },
#   iterationCount INTEGER (1..MAX),
#   keyLength INTEGER (1..MAX) OPTIONAL,
#   prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1
#   }
#
# scrypt-params ::= SEQUENCE {
#       salt OCTET STRING,
#       costParameter INTEGER (1..MAX),
#       blockSize INTEGER (1..MAX),
#       parallelizationParameter INTEGER (1..MAX),
#       keyLength INTEGER (1..MAX) OPTIONAL
#   }

class PBES1(object):
    """Deprecated encryption scheme with password-based key derivation
    (originally defined in PKCS#5 v1.5, but still present in `v2.0`__).

    .. __: http://www.ietf.org/rfc/rfc2898.txt
    """

    @staticmethod
    def decrypt(data, passphrase):
        """Decrypt a piece of data using a passphrase and *PBES1*.

        The algorithm to use is automatically detected.

        :Parameters:
          data : byte string
            The piece of data to decrypt.
          passphrase : byte string
            The passphrase to use for decrypting the data.
        :Returns:
          The decrypted data, as a binary string.
        """

        enc_private_key_info = DerSequence().decode(data)
        encrypted_algorithm = DerSequence().decode(enc_private_key_info[0])
        encrypted_data = DerOctetString().decode(enc_private_key_info[1]).payload

        pbe_oid = DerObjectId().decode(encrypted_algorithm[0]).value
        cipher_params = {}
        if pbe_oid == _OID_PBE_WITH_MD5_AND_DES_CBC:
            # PBE_MD5_DES_CBC
            hashmod = MD5
            ciphermod = DES
        elif pbe_oid == _OID_PBE_WITH_MD5_AND_RC2_CBC:
            # PBE_MD5_RC2_CBC
            hashmod = MD5
            ciphermod = ARC2
            cipher_params['effective_keylen'] = 64
        elif pbe_oid == _OID_PBE_WITH_SHA1_AND_DES_CBC:
            # PBE_SHA1_DES_CBC
            hashmod = SHA1
            ciphermod = DES
        elif pbe_oid == _OID_PBE_WITH_SHA1_AND_RC2_CBC:
            # PBE_SHA1_RC2_CBC
            hashmod = SHA1
            ciphermod = ARC2
            cipher_params['effective_keylen'] = 64
        else:
            raise PbesError("Unknown OID for PBES1")

        pbe_params = DerSequence().decode(encrypted_algorithm[1], nr_elements=2)
        salt = DerOctetString().decode(pbe_params[0]).payload
        iterations = pbe_params[1]

        key_iv = PBKDF1(passphrase, salt, 16, iterations, hashmod)
        key, iv = key_iv[:8], key_iv[8:]

        cipher = ciphermod.new(key, ciphermod.MODE_CBC, iv, **cipher_params)
        pt = cipher.decrypt(encrypted_data)
        return unpad(pt, cipher.block_size)


class PBES2(object):
    """Encryption scheme with password-based key derivation
    (defined in `PKCS#5 v2.0`__).

    .. __: http://www.ietf.org/rfc/rfc2898.txt."""

    @staticmethod
    def encrypt(data, passphrase, protection, prot_params=None, randfunc=None):
        """Encrypt a piece of data using a passphrase and *PBES2*.

        :Parameters:
          data : byte string
            The piece of data to encrypt.
          passphrase : byte string
            The passphrase to use for encrypting the data.
          protection : string
            The identifier of the encryption algorithm to use.
            The default value is '``PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC``'.
          prot_params : dictionary
            Parameters of the protection algorithm.

            +------------------+-----------------------------------------------+
            | Key              | Description                                   |
            +==================+===============================================+
            | iteration_count  | The KDF algorithm is repeated several times to|
            |                  | slow down brute force attacks on passwords    |
            |                  | (called *N* or CPU/memory cost in scrypt).    |
            |                  |                                               |
            |                  | The default value for PBKDF2 is 1 000.        |
            |                  | The default value for scrypt is 16 384.       |
            +------------------+-----------------------------------------------+
            | salt_size        | Salt is used to thwart dictionary and rainbow |
            |                  | attacks on passwords. The default value is 8  |
            |                  | bytes.                                        |
            +------------------+-----------------------------------------------+
            | block_size       | *(scrypt only)* Memory-cost (r). The default  |
            |                  | value is 8.                                   |
            +------------------+-----------------------------------------------+
            | parallelization  | *(scrypt only)* CPU-cost (p). The default     |
            |                  | value is 1.                                   |
            +------------------+-----------------------------------------------+


          randfunc : callable
            Random number generation function; it should accept
            a single integer N and return a string of random data,
            N bytes long. If not specified, a new RNG will be
            instantiated from ``Crypto.Random``.

        :Returns:
          The encrypted data, as a binary string.
        """

        if prot_params is None:
            prot_params = {}

        if randfunc is None:
            randfunc = Random.new().read

        if protection == 'PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC':
            key_size = 24
            module = DES3
            cipher_mode = DES3.MODE_CBC
            enc_oid = _OID_DES_EDE3_CBC
        elif protection in ('PBKDF2WithHMAC-SHA1AndAES128-CBC',
                'scryptAndAES128-CBC'):
            key_size = 16
            module = AES
            cipher_mode = AES.MODE_CBC
            enc_oid = _OID_AES128_CBC
        elif protection in ('PBKDF2WithHMAC-SHA1AndAES192-CBC',
                'scryptAndAES192-CBC'):
            key_size = 24
            module = AES
            cipher_mode = AES.MODE_CBC
            enc_oid = _OID_AES192_CBC
        elif protection in ('PBKDF2WithHMAC-SHA1AndAES256-CBC',
                'scryptAndAES256-CBC'):
            key_size = 32
            module = AES
            cipher_mode = AES.MODE_CBC
            enc_oid = _OID_AES256_CBC
        else:
            raise ValueError("Unknown PBES2 mode")

        # Get random data
        iv = randfunc(module.block_size)
        salt = randfunc(prot_params.get("salt_size", 8))

        # Derive key from password
        if protection.startswith('PBKDF2'):
            count = prot_params.get("iteration_count", 1000)
            key = PBKDF2(passphrase, salt, key_size, count)
            kdf_info = DerSequence([
                    DerObjectId(_OID_PBKDF2),   # PBKDF2
                    DerSequence([
                        DerOctetString(salt),
                        DerInteger(count)
                    ])
            ])
        else:
            # It must be scrypt
            count = prot_params.get("iteration_count", 16384)
            scrypt_r = prot_params.get('block_size', 8)
            scrypt_p = prot_params.get('parallelization', 1)
            key = scrypt(passphrase, salt, key_size,
                         count, scrypt_r, scrypt_p)
            kdf_info = DerSequence([
                    DerObjectId(_OID_SCRYPT),  # scrypt
                    DerSequence([
                        DerOctetString(salt),
                        DerInteger(count),
                        DerInteger(scrypt_r),
                        DerInteger(scrypt_p)
                    ])
            ])

        # Create cipher and use it
        cipher = module.new(key, cipher_mode, iv)
        encrypted_data = cipher.encrypt(pad(data, cipher.block_size))
        enc_info = DerSequence([
                DerObjectId(enc_oid),
                DerOctetString(iv)
        ])

        # Result
        enc_private_key_info = DerSequence([
            # encryptionAlgorithm
            DerSequence([
                DerObjectId(_OID_PBES2),
                DerSequence([
                    kdf_info,
                    enc_info
                ]),
            ]),
            DerOctetString(encrypted_data)
        ])
        return enc_private_key_info.encode()

    @staticmethod
    def decrypt(data, passphrase):
        """Decrypt a piece of data using a passphrase and *PBES2*.

        The algorithm to use is automatically detected.

        :Parameters:
          data : byte string
            The piece of data to decrypt.
          passphrase : byte string
            The passphrase to use for decrypting the data.
        :Returns:
          The decrypted data, as a binary string.
        """

        enc_private_key_info = DerSequence().decode(data, nr_elements=2)
        enc_algo = DerSequence().decode(enc_private_key_info[0])
        encrypted_data = DerOctetString().decode(enc_private_key_info[1]).payload

        pbe_oid = DerObjectId().decode(enc_algo[0]).value
        if pbe_oid != _OID_PBES2:
            raise PbesError("Not a PBES2 object")

        pbes2_params = DerSequence().decode(enc_algo[1], nr_elements=2)

        ### Key Derivation Function selection
        kdf_info = DerSequence().decode(pbes2_params[0], nr_elements=2)
        kdf_oid = DerObjectId().decode(kdf_info[0]).value

        kdf_key_length = None

        # We only support PBKDF2 or scrypt
        if kdf_oid == _OID_PBKDF2:

            pbkdf2_params = DerSequence().decode(kdf_info[1], nr_elements=(2, 3, 4))
            salt = DerOctetString().decode(pbkdf2_params[0]).payload
            iteration_count = pbkdf2_params[1]

            left = len(pbkdf2_params) - 2
            idx = 2

            if left > 0:
                try:
                    kdf_key_length = pbkdf2_params[idx] - 0
                    left -= 1
                    idx += 1
                except TypeError:
                    pass

            # Default is HMAC-SHA1
            pbkdf2_prf_oid = "1.2.840.113549.2.7"
            if left > 0:
                pbkdf2_prf_algo_id = DerSequence().decode(pbkdf2_params[idx])
                pbkdf2_prf_oid = DerObjectId().decode(pbkdf2_prf_algo_id[0]).value

        elif kdf_oid == _OID_SCRYPT:

            scrypt_params = DerSequence().decode(kdf_info[1], nr_elements=(4, 5))
            salt = DerOctetString().decode(scrypt_params[0]).payload
            iteration_count, scrypt_r, scrypt_p = [scrypt_params[x]
                                                   for x in (1, 2, 3)]
            if len(scrypt_params) > 4:
                kdf_key_length = scrypt_params[4]
            else:
                kdf_key_length = None
        else:
            raise PbesError("Unsupported PBES2 KDF")

        ### Cipher selection
        enc_info = DerSequence().decode(pbes2_params[1])
        enc_oid = DerObjectId().decode(enc_info[0]).value

        if enc_oid == _OID_DES_EDE3_CBC:
            # DES_EDE3_CBC
            ciphermod = DES3
            key_size = 24
        elif enc_oid == _OID_AES128_CBC:
            # AES128_CBC
            ciphermod = AES
            key_size = 16
        elif enc_oid == _OID_AES192_CBC:
            # AES192_CBC
            ciphermod = AES
            key_size = 24
        elif enc_oid == _OID_AES256_CBC:
            # AES256_CBC
            ciphermod = AES
            key_size = 32
        else:
            raise PbesError("Unsupported PBES2 cipher")

        if kdf_key_length and kdf_key_length != key_size:
            raise PbesError("Mismatch between PBES2 KDF parameters"
                            " and selected cipher")

        IV = DerOctetString().decode(enc_info[1]).payload

        # Create cipher
        if kdf_oid == _OID_PBKDF2:
            if pbkdf2_prf_oid == _OID_HMAC_SHA1:
                hmac_hash_module = SHA1
            elif pbkdf2_prf_oid == _OID_HMAC_SHA224:
                hmac_hash_module = SHA224
            elif pbkdf2_prf_oid == _OID_HMAC_SHA256:
                hmac_hash_module = SHA256
            elif pbkdf2_prf_oid == _OID_HMAC_SHA384:
                hmac_hash_module = SHA384
            elif pbkdf2_prf_oid == _OID_HMAC_SHA512:
                hmac_hash_module = SHA512
            else:
                raise PbesError("Unsupported HMAC %s" % pbkdf2_prf_oid)

            key = PBKDF2(passphrase, salt, key_size, iteration_count,
                         hmac_hash_module=hmac_hash_module)
        else:
            key = scrypt(passphrase, salt, key_size, iteration_count,
                         scrypt_r, scrypt_p)
        cipher = ciphermod.new(key, ciphermod.MODE_CBC, IV)

        # Decrypt data
        pt = cipher.decrypt(encrypted_data)
        return unpad(pt, cipher.block_size)

Youez - 2016 - github.com/yon3zu
LinuXploit