a Y@s&ddlZddlZgdZddZddZddZd d ZzeWn.eyne Zd dZd dZd d ZYn0Gddde Z Gddde Z Gddde Z Gddde ZGdddeZGddde ZGddde ZGdddeZGdddeZGd d!d!eZeeeeeed"ZdS)#N)AESAESModeOfOperationCTRAESModeOfOperationCBCAESModeOfOperationCFBAESModeOfOperationECBAESModeOfOperationOFBAESModesOfOperationCountercCs,|dd>|dd>B|dd>B|dBS)Nr)wordrr>/home/ec2-user/.local/lib/python3.9/site-packages/pyaes/aes.py _compact_word=srcCstdd|DS)Ncss|]}t|VqdSNord.0crrr Az#_string_to_bytes..)listtextrrr_string_to_bytes@srcCsddd|DS)Ncss|]}t|VqdSr)chr)rbrrrrDrz#_bytes_to_string..)joinbinaryrrr_bytes_to_stringCsr&cCs||Srrar"rrr _concat_listFsr)cCst|tr|Sdd|DS)NcSsg|] }t|qSrrrrrr Trz$_string_to_bytes..) isinstancebytesrrrrrQs cCst|Srr,r$rrrr&WscCs |t|Srr-r'rrrr)[sc@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*rz$Counter.__init__..ri)r._counter)r7r\rr[rr=szCounter.__init__cCs|jSr)r^srrrrzCounter.cCs`tt|jdddD]2}|j|d7<|j|dkr>q\d|j|<qdgt|j|_dS)z1Increment the counter (overflow rolls back to 0).r r]rZrN)r.r+r^)r7r&rrr increments  zCounter.incrementN)r )rVrWrXrYr=propertyvaluerbrrrrr s  r c@s(eZdZdZddZddZddZdS) AESBlockModeOfOperationz;Super-class for AES modes of operation that require blocks.cCst||_dSr)r_aes)r7r*rrrr=/sz AESBlockModeOfOperation.__init__cCs tddSNznot implemented Exceptionr7rOrrrrU2szAESBlockModeOfOperation.decryptcCs tddSrgrhr7rBrrrrM5szAESBlockModeOfOperation.encryptN)rVrWrXrYr=rUrMrrrrre-srec@seZdZdZdS)AESStreamModeOfOperationz?Super-class for AES modes of operation that are stream-ciphers.N)rVrWrXrYrrrrrl9srlc@seZdZdZdZdS)AESSegmentModeOfOperationz9Super-class for AES modes of operation that segment data.r N)rVrWrXrY segment_bytesrrrrrm<srmc@s$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)cCs,t|dkrtdt|}t|j|S)Nr plaintext block must be 16 bytes)r+r,rr&rfrMrkrrrrMTs zAESModeOfOperationECB.encryptcCs,t|dkrtdt|}t|j|S)Nr !ciphertext block must be 16 bytes)r+r,rr&rfrUrjrrrrU[s zAESModeOfOperationECB.decryptN)rVrWrXrYnamerMrUrrrrrCsrc@s.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)NcCsF|durdgd|_n t|dkr,tdn t||_t||dSNrr &initialization vector must be 16 bytes)_last_cipherblockr+r,rrer=r7r*ivrrrr=ys    zAESModeOfOperationCBC.__init__cCsJt|dkrtdt|}ddt||jD}|j||_t|jS)Nr rocSsg|]\}}||AqSrrrplrrrr*rz1AESModeOfOperationCBC.encrypt..)r+r,rziprtrfrMr&)r7rBZprecipherblockrrrrMs  zAESModeOfOperationCBC.encryptcCsHt|dkrtdt|}ddt|j||jD}||_t|S)Nr rpcSsg|]\}}||AqSrrrwrrrr*rz1AESModeOfOperationCBC.decrypt..)r+r,rrzrfrUrtr&)r7rOZ cipherblockrBrrrrUs  zAESModeOfOperationCBC.decrypt)NrVrWrXrYrqr=rMrUrrrrrds   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 cCsX|dkr d}|dur"dgd|_n t|dkr8tdn t||_||_t||dS)Nrr r rs)_shift_registerr+r,r_segment_bytesrer=)r7r*rvZ segment_sizerrrr=s    zAESModeOfOperationCFB.__init__cCs|jSr)r}r_rrrrarzAESModeOfOperationCFB.cCst||jdkrtdt|}g}tdt||jD]h}||||j}|j|jdt|}ddt||D}t |jt|d||_| |q8t |S)Nrz2plaintext block must be a multiple of segment_sizecSsg|]\}}||AqSrrrrxxrrrr*rz1AESModeOfOperationCFB.encrypt.. r+r}r,rr.rfrMr|rzr)extendr&)r7rB encryptedr&plaintext_segment xor_segmentcipher_segmentrrrrMs zAESModeOfOperationCFB.encryptcCst||jdkrtdt|}g}tdt||jD]h}||||j}|j|jdt|}ddt||D}t |jt|d||_| |q8t |S)Nrz3ciphertext block must be a multiple of segment_sizecSsg|]\}}||AqSrrr~rrrr*rz1AESModeOfOperationCFB.decrypt..r)r7rOZ decryptedr&rrrrrrrUs zAESModeOfOperationCFB.decryptN)r ) rVrWrXrYrqr=rcrnrMrUrrrrrs    rc@s.eZdZdZdZd ddZddZdd ZdS) 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)NcCsL|durdgd|_n t|dkr,tdn t||_g|_t||dSrr)_last_precipherblockr+r,r_remaining_blockrer=rurrrr=s   zAESModeOfOperationOFB.__init__cCshg}t|D]R}t|jdkr4|j|j|_g|_|jd}|j|||A}||q t|S)Nr) rr+rrfrMrpoprHr&)r7rBrrxZ precipherbyteZ cipherbyterrrrMs    zAESModeOfOperationOFB.encryptcCs ||SrrMrjrrrrU szAESModeOfOperationOFB.decrypt)Nr{rrrrrs    rc@s.eZdZdZdZd ddZddZdd ZdS) 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|||durt}||_g|_dSr)rer=r r^_remaining_counter)r7r*counterrrrr=,s  zAESModeOfOperationCTR.__init__cCsrt|jt|kr8|j|j|jj7_|jqt|}ddt||jD}|jt|d|_t |S)NcSsg|]\}}||AqSrr)rrxrrrrr*<rz1AESModeOfOperationCTR.encrypt..) r+rrfrMr^rdrbrrzr&)r7rBrrrrrM5s zAESModeOfOperationCTR.encryptcCs ||Srr)r7Z crypttextrrrrUAszAESModeOfOperationCTR.decrypt)Nr{rrrrrs   r)ZctrZcbcZcfbZecbZofb)rGr'__all__rrr&r)r.rirangeobjectrr rerlrmrrrrrdictrrrrr6s> 0 !5G/8