o j@s&ddlZddlZgdZddZddZddZd d ZzeWney7e Zd dZd dZd d ZYnwGddde Z Gddde Z Gddde Z Gddde ZGdddeZGddde ZGddde ZGdddeZGdddeZGd d!d!eZeeeeeed"ZdS)#N)AESAESModeOfOperationCTRAESModeOfOperationCBCAESModeOfOperationCFBAESModeOfOperationECBAESModeOfOperationOFBAESModesOfOperationCountercCs,|dd>|dd>B|dd>B|dBS)Nr)wordrr/root/aizidognhua/tmp/workspace/projects/ec89d86c-575f-41c9-af57-ac45cbdbf775/venv/lib/python3.10/site-packages/unicrypto/backends/pure/external/AES/AES.py _compact_word?s,rcCstdd|DS)Ncs|]}t|VqdSNord.0crrr Cz#_string_to_bytes..)listtextrrr_string_to_bytesBsr cCsddd|DS)Ncsrr)chr)rbrrrrFrz#_bytes_to_string..)joinbinaryrrr_bytes_to_stringEsr'cCs||Srrar#rrr _concat_listHr*cCst|tr|Sdd|DS)NcSsg|]}t|qSrrrrrr Vsz$_string_to_bytes..) isinstancebytesrrrrr Ss cCst|Srr.r%rrrr'Yr+cCs |t|Srr/r(rrrr*]s c@seZdZdZddddZgdZgdZgdZgd Zgd Z gd Z gd Z gd Z gdZ gdZgdZgdZgdZgdZgdZddZddZddZdS)rzEncapsulates the AES block cipher. You generally should not need this. 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To create a custom counter, you can usually just override the increment method.r cs fddtdddD|_dS)Ncsg|]}|?dqS)rr( initial_valuerrr,z$Counter.__init__..ri)r2_counter)r;rhrrgrrEs zCounter.__init__cC|jSr)rksrrrzCounter.cCsbtt|jdddD]}|j|d7<|j|dkr dSd|j|<q dgt|j|_dS)z1Increment the counter (overflow rolls back to 0).r rjrfrN)r2r/rk)r;r)rrr increments  zCounter.incrementNr )rbrcrdrerEpropertyvaluerqrrrrr s    r c@s(eZdZdZddZddZddZdS) AESBlockModeOfOperationz;Super-class for AES modes of operation that require blocks.cCst||_dSr)r_aes)r;r.rrrrE1sz AESBlockModeOfOperation.__init__cCtdNznot implemented Exceptionr;r[rrrra4r+zAESBlockModeOfOperation.decryptcCrwrxryr;rLrrrrX7r+zAESBlockModeOfOperation.encryptN)rbrcrdrerErarXrrrrru/s  ruc@seZdZdZdS)AESStreamModeOfOperationz?Super-class for AES modes of operation that are stream-ciphers.N)rbrcrdrerrrrr};sr}c@seZdZdZdZdS)AESSegmentModeOfOperationz9Super-class for AES modes of operation that segment data.r N)rbrcrdre segment_bytesrrrrr~>sr~c@s$eZdZdZdZddZddZdS)raAES Electronic Codebook Mode of Operation. o Block-cipher, so data must be padded to 16 byte boundaries Security Notes: o This mode is not recommended o Any two identical blocks produce identical encrypted values, exposing data patterns. (See the image of Tux on wikipedia) Also see: o https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_codebook_.28ECB.29 o See NIST SP800-38A (http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf); section 6.1zElectronic Codebook (ECB)cC,t|dkr tdt|}t|j|S)Nr plaintext block must be 16 bytes)r/r0r r'rvrXr|rrrrXV zAESModeOfOperationECB.encryptcCr)Nr !ciphertext block must be 16 bytes)r/r0r r'rvrar{rrrra]rzAESModeOfOperationECB.decryptN)rbrcrdrenamerXrarrrrrEs  rc@.eZdZdZdZd ddZddZdd ZdS) raAES Cipher-Block Chaining Mode of Operation. o The Initialization Vector (IV) o Block-cipher, so data must be padded to 16 byte boundaries o An incorrect initialization vector will only cause the first block to be corrupt; all other blocks will be intact o A corrupt bit in the cipher text will cause a block to be corrupted, and the next block to be inverted, but all other blocks will be intact. Security Notes: o This method (and CTR) ARE recommended. Also see: o https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher-block_chaining_.28CBC.29 o See NIST SP800-38A (http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf); section 6.2zCipher-Block Chaining (CBC)NcCsD|dur dgd|_nt|dkrtdt||_t||dSNrr &initialization vector must be 16 bytes)_last_cipherblockr/r0r rurEr;r.ivrrrrE{s   zAESModeOfOperationCBC.__init__cCsJt|dkr tdt|}ddt||jD}|j||_t|jS)Nr rcSg|]\}}||AqSrrrplrrrr,riz1AESModeOfOperationCBC.encrypt..)r/r0r ziprrvrXr')r;rLprecipherblockrrrrXs  zAESModeOfOperationCBC.encryptcCsHt|dkr tdt|}ddt|j||jD}||_t|S)Nr rcSrrrrrrrr,riz1AESModeOfOperationCBC.decrypt..)r/r0r rrvrarr')r;r[ cipherblockrLrrrras zAESModeOfOperationCBC.decryptrrbrcrdrerrErXrarrrrrfs   rc@s:eZdZdZdZd ddZeddZdd Zd d Z d S)raAES Cipher Feedback Mode of Operation. o A stream-cipher, so input does not need to be padded to blocks, but does need to be padded to segment_size Also see: o https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_feedback_.28CFB.29 o See NIST SP800-38A (http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf); section 6.3zCipher Feedback (CFB)r cCsV|dkrd}|durdgd|_nt|dkrtdt||_||_t||dS)Nrr r r)_shift_registerr/r0r _segment_bytesrurE)r;r.r segment_sizerrrrEs   zAESModeOfOperationCFB.__init__cCrlr)rrmrrrrorpzAESModeOfOperationCFB.cCst|}g}tdt||jD]4}||||j}|j|jdt|}ddt||D}t|jt|d||_| |qt |S)NrcSrrrrrxrrrr,riz1AESModeOfOperationCFB.encrypt.. r r2r/rrvrXrrr*extendr')r;rL encryptedr)plaintext_segment xor_segmentcipher_segmentrrrrX zAESModeOfOperationCFB.encryptcCst|}g}tdt||jD]4}||||j}|j|jdt|}ddt||D}t|jt|d||_| |qt |S)NrcSrrrrrrrr,riz1AESModeOfOperationCFB.decrypt..r)r;r[ decryptedr)rrrrrrrarzAESModeOfOperationCFB.decryptNrr) rbrcrdrerrErsrrXrarrrrrs   rc@r) ra AES Output Feedback Mode of Operation. o A stream-cipher, so input does not need to be padded to blocks, allowing arbitrary length data. o A bit twiddled in the cipher text, twiddles the same bit in the same bit in the plain text, which can be useful for error correction techniques. Also see: o https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Output_feedback_.28OFB.29 o See NIST SP800-38A (http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf); section 6.4zOutput Feedback (OFB)NcCsJ|dur dgd|_nt|dkrtdt||_g|_t||dSr)_last_precipherblockr/r0r _remaining_blockrurErrrrrEs  zAESModeOfOperationOFB.__init__cCshg}t|D])}t|jdkr|j|j|_g|_|jd}|j|||A}||qt|S)Nr) r r/rrvrXrpoprSr')r;rLrr precipherbyte cipherbyterrrrXs    zAESModeOfOperationOFB.encryptcC ||SrrXr{rrrra  zAESModeOfOperationOFB.decryptrrrrrrrs   rc@r) raUAES Counter Mode of Operation. o A stream-cipher, so input does not need to be padded to blocks, allowing arbitrary length data. o The counter must be the same size as the key size (ie. len(key)) o Each block independant of the other, so a corrupt byte will not damage future blocks. o Each block has a uniue counter value associated with it, which contributes to the encrypted value, so no data patterns are leaked. o Also known as: Counter Mode (CM), Integer Counter Mode (ICM) and Segmented Integer Counter (SIC Security Notes: o This method (and CBC) ARE recommended. o Each message block is associated with a counter value which must be unique for ALL messages with the same key. Otherwise security may be compromised. Also see: o https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29 o See NIST SP800-38A (http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf); section 6.5 and Appendix B for managing the initial counterz Counter (CTR)NcCs*t|||dur t}||_g|_dSr)rurEr rk_remaining_counter)r;r.counterrrrrE.s  zAESModeOfOperationCTR.__init__cCst|jt|kr$|j|j|jj7_|jt|jt|ks t|}ddt||jD}|jt|d|_t |S)NcSrrr)rrrrrrr,>riz1AESModeOfOperationCTR.encrypt..) r/rrvrXrkrtrqr rr')r;rLrrrrrX7s zAESModeOfOperationCTR.encryptcCrrr)r; crypttextrrrraCrzAESModeOfOperationCTR.decryptrrrrrrrs   r)ctrcbccfbecbofb)rRr+__all__rr r'r*r2rzrangeobjectrr rur}r~rrrrrdictrrrrrsB7  0 !5G/8