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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ# coding: utf-8 from __future__ import unicode_literals, division, absolute_import, print_function from .._errors import pretty_message from .._ffi import new, null from ._core_foundation import CoreFoundation, CFHelpers, handle_cf_error from ._security import Security from .util import rand_bytes from .._types import type_name, byte_cls __all__ = [ 'aes_cbc_no_padding_decrypt', 'aes_cbc_no_padding_encrypt', 'aes_cbc_pkcs7_decrypt', 'aes_cbc_pkcs7_encrypt', 'des_cbc_pkcs5_decrypt', 'des_cbc_pkcs5_encrypt', 'rc2_cbc_pkcs5_decrypt', 'rc2_cbc_pkcs5_encrypt', 'rc4_decrypt', 'rc4_encrypt', 'tripledes_cbc_pkcs5_decrypt', 'tripledes_cbc_pkcs5_encrypt', ] def aes_cbc_no_padding_encrypt(key, data, iv): """ Encrypts plaintext using AES in CBC mode with a 128, 192 or 256 bit key and no padding. This means the ciphertext must be an exact multiple of 16 bytes long. :param key: The encryption key - a byte string either 16, 24 or 32 bytes long :param data: The plaintext - a byte string :param iv: The initialization vector - either a byte string 16-bytes long or None to generate an IV :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A tuple of two byte strings (iv, ciphertext) """ if len(key) not in [16, 24, 32]: raise ValueError(pretty_message( ''' key must be either 16, 24 or 32 bytes (128, 192 or 256 bits) long - is %s ''', len(key) )) if not iv: iv = rand_bytes(16) elif len(iv) != 16: raise ValueError(pretty_message( ''' iv must be 16 bytes long - is %s ''', len(iv) )) if len(data) % 16 != 0: raise ValueError(pretty_message( ''' data must be a multiple of 16 bytes long - is %s ''', len(data) )) return (iv, _encrypt(Security.kSecAttrKeyTypeAES, key, data, iv, Security.kSecPaddingNoneKey)) def aes_cbc_no_padding_decrypt(key, data, iv): """ Decrypts AES ciphertext in CBC mode using a 128, 192 or 256 bit key and no padding. :param key: The encryption key - a byte string either 16, 24 or 32 bytes long :param data: The ciphertext - a byte string :param iv: The initialization vector - a byte string 16-bytes long :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if len(key) not in [16, 24, 32]: raise ValueError(pretty_message( ''' key must be either 16, 24 or 32 bytes (128, 192 or 256 bits) long - is %s ''', len(key) )) if len(iv) != 16: raise ValueError(pretty_message( ''' iv must be 16 bytes long - is %s ''', len(iv) )) return _decrypt(Security.kSecAttrKeyTypeAES, key, data, iv, Security.kSecPaddingNoneKey) def aes_cbc_pkcs7_encrypt(key, data, iv): """ Encrypts plaintext using AES in CBC mode with a 128, 192 or 256 bit key and PKCS#7 padding. :param key: The encryption key - a byte string either 16, 24 or 32 bytes long :param data: The plaintext - a byte string :param iv: The initialization vector - either a byte string 16-bytes long or None to generate an IV :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A tuple of two byte strings (iv, ciphertext) """ if len(key) not in [16, 24, 32]: raise ValueError(pretty_message( ''' key must be either 16, 24 or 32 bytes (128, 192 or 256 bits) long - is %s ''', len(key) )) if not iv: iv = rand_bytes(16) elif len(iv) != 16: raise ValueError(pretty_message( ''' iv must be 16 bytes long - is %s ''', len(iv) )) return (iv, _encrypt(Security.kSecAttrKeyTypeAES, key, data, iv, Security.kSecPaddingPKCS7Key)) def aes_cbc_pkcs7_decrypt(key, data, iv): """ Decrypts AES ciphertext in CBC mode using a 128, 192 or 256 bit key :param key: The encryption key - a byte string either 16, 24 or 32 bytes long :param data: The ciphertext - a byte string :param iv: The initialization vector - a byte string 16-bytes long :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if len(key) not in [16, 24, 32]: raise ValueError(pretty_message( ''' key must be either 16, 24 or 32 bytes (128, 192 or 256 bits) long - is %s ''', len(key) )) if len(iv) != 16: raise ValueError(pretty_message( ''' iv must be 16 bytes long - is %s ''', len(iv) )) return _decrypt(Security.kSecAttrKeyTypeAES, key, data, iv, Security.kSecPaddingPKCS7Key) def rc4_encrypt(key, data): """ Encrypts plaintext using RC4 with a 40-128 bit key :param key: The encryption key - a byte string 5-16 bytes long :param data: The plaintext - a byte string :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the ciphertext """ if len(key) < 5 or len(key) > 16: raise ValueError(pretty_message( ''' key must be 5 to 16 bytes (40 to 128 bits) long - is %s ''', len(key) )) return _encrypt(Security.kSecAttrKeyTypeRC4, key, data, None, None) def rc4_decrypt(key, data): """ Decrypts RC4 ciphertext using a 40-128 bit key :param key: The encryption key - a byte string 5-16 bytes long :param data: The ciphertext - a byte string :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if len(key) < 5 or len(key) > 16: raise ValueError(pretty_message( ''' key must be 5 to 16 bytes (40 to 128 bits) long - is %s ''', len(key) )) return _decrypt(Security.kSecAttrKeyTypeRC4, key, data, None, None) def rc2_cbc_pkcs5_encrypt(key, data, iv): """ Encrypts plaintext using RC2 with a 64 bit key :param key: The encryption key - a byte string 8 bytes long :param data: The plaintext - a byte string :param iv: The 8-byte initialization vector to use - a byte string - set as None to generate an appropriate one :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A tuple of two byte strings (iv, ciphertext) """ if len(key) < 5 or len(key) > 16: raise ValueError(pretty_message( ''' key must be 5 to 16 bytes (40 to 128 bits) long - is %s ''', len(key) )) if not iv: iv = rand_bytes(8) elif len(iv) != 8: raise ValueError(pretty_message( ''' iv must be 8 bytes long - is %s ''', len(iv) )) return (iv, _encrypt(Security.kSecAttrKeyTypeRC2, key, data, iv, Security.kSecPaddingPKCS5Key)) def rc2_cbc_pkcs5_decrypt(key, data, iv): """ Decrypts RC2 ciphertext using a 64 bit key :param key: The encryption key - a byte string 8 bytes long :param data: The ciphertext - a byte string :param iv: The initialization vector used for encryption - a byte string :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if len(key) < 5 or len(key) > 16: raise ValueError(pretty_message( ''' key must be 5 to 16 bytes (40 to 128 bits) long - is %s ''', len(key) )) if len(iv) != 8: raise ValueError(pretty_message( ''' iv must be 8 bytes long - is %s ''', len(iv) )) return _decrypt(Security.kSecAttrKeyTypeRC2, key, data, iv, Security.kSecPaddingPKCS5Key) def tripledes_cbc_pkcs5_encrypt(key, data, iv): """ Encrypts plaintext using 3DES in either 2 or 3 key mode :param key: The encryption key - a byte string 16 or 24 bytes long (2 or 3 key mode) :param data: The plaintext - a byte string :param iv: The 8-byte initialization vector to use - a byte string - set as None to generate an appropriate one :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A tuple of two byte strings (iv, ciphertext) """ if len(key) != 16 and len(key) != 24: raise ValueError(pretty_message( ''' key must be 16 bytes (2 key) or 24 bytes (3 key) long - %s ''', len(key) )) if not iv: iv = rand_bytes(8) elif len(iv) != 8: raise ValueError(pretty_message( ''' iv must be 8 bytes long - %s ''', len(iv) )) # Expand 2-key to actual 24 byte byte string used by cipher if len(key) == 16: key = key + key[0:8] return (iv, _encrypt(Security.kSecAttrKeyType3DES, key, data, iv, Security.kSecPaddingPKCS5Key)) def tripledes_cbc_pkcs5_decrypt(key, data, iv): """ Decrypts 3DES ciphertext in either 2 or 3 key mode :param key: The encryption key - a byte string 16 or 24 bytes long (2 or 3 key mode) :param data: The ciphertext - a byte string :param iv: The initialization vector used for encryption - a byte string :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if len(key) != 16 and len(key) != 24: raise ValueError(pretty_message( ''' key must be 16 bytes (2 key) or 24 bytes (3 key) long - is %s ''', len(key) )) if len(iv) != 8: raise ValueError(pretty_message( ''' iv must be 8 bytes long - is %s ''', len(iv) )) # Expand 2-key to actual 24 byte byte string used by cipher if len(key) == 16: key = key + key[0:8] return _decrypt(Security.kSecAttrKeyType3DES, key, data, iv, Security.kSecPaddingPKCS5Key) def des_cbc_pkcs5_encrypt(key, data, iv): """ Encrypts plaintext using DES with a 56 bit key :param key: The encryption key - a byte string 8 bytes long (includes error correction bits) :param data: The plaintext - a byte string :param iv: The 8-byte initialization vector to use - a byte string - set as None to generate an appropriate one :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A tuple of two byte strings (iv, ciphertext) """ if len(key) != 8: raise ValueError(pretty_message( ''' key must be 8 bytes (56 bits + 8 parity bits) long - is %s ''', len(key) )) if not iv: iv = rand_bytes(8) elif len(iv) != 8: raise ValueError(pretty_message( ''' iv must be 8 bytes long - is %s ''', len(iv) )) return (iv, _encrypt(Security.kSecAttrKeyTypeDES, key, data, iv, Security.kSecPaddingPKCS5Key)) def des_cbc_pkcs5_decrypt(key, data, iv): """ Decrypts DES ciphertext using a 56 bit key :param key: The encryption key - a byte string 8 bytes long (includes error correction bits) :param data: The ciphertext - a byte string :param iv: The initialization vector used for encryption - a byte string :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if len(key) != 8: raise ValueError(pretty_message( ''' key must be 8 bytes (56 bits + 8 parity bits) long - is %s ''', len(key) )) if len(iv) != 8: raise ValueError(pretty_message( ''' iv must be 8 bytes long - is %s ''', len(iv) )) return _decrypt(Security.kSecAttrKeyTypeDES, key, data, iv, Security.kSecPaddingPKCS5Key) def _encrypt(cipher, key, data, iv, padding): """ Encrypts plaintext :param cipher: A kSecAttrKeyType* value that specifies the cipher to use :param key: The encryption key - a byte string 5-16 bytes long :param data: The plaintext - a byte string :param iv: The initialization vector - a byte string - unused for RC4 :param padding: The padding mode to use, specified as a kSecPadding*Key value - unused for RC4 :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the ciphertext """ if not isinstance(key, byte_cls): raise TypeError(pretty_message( ''' key must be a byte string, not %s ''', type_name(key) )) if not isinstance(data, byte_cls): raise TypeError(pretty_message( ''' data must be a byte string, not %s ''', type_name(data) )) if cipher != Security.kSecAttrKeyTypeRC4 and not isinstance(iv, byte_cls): raise TypeError(pretty_message( ''' iv must be a byte string, not %s ''', type_name(iv) )) if cipher != Security.kSecAttrKeyTypeRC4 and not padding: raise ValueError('padding must be specified') cf_dict = None cf_key = None cf_data = None cf_iv = None sec_key = None sec_transform = None try: cf_dict = CFHelpers.cf_dictionary_from_pairs([(Security.kSecAttrKeyType, cipher)]) cf_key = CFHelpers.cf_data_from_bytes(key) cf_data = CFHelpers.cf_data_from_bytes(data) error_pointer = new(CoreFoundation, 'CFErrorRef *') sec_key = Security.SecKeyCreateFromData(cf_dict, cf_key, error_pointer) handle_cf_error(error_pointer) sec_transform = Security.SecEncryptTransformCreate(sec_key, error_pointer) handle_cf_error(error_pointer) if cipher != Security.kSecAttrKeyTypeRC4: Security.SecTransformSetAttribute(sec_transform, Security.kSecModeCBCKey, null(), error_pointer) handle_cf_error(error_pointer) Security.SecTransformSetAttribute(sec_transform, Security.kSecPaddingKey, padding, error_pointer) handle_cf_error(error_pointer) cf_iv = CFHelpers.cf_data_from_bytes(iv) Security.SecTransformSetAttribute(sec_transform, Security.kSecIVKey, cf_iv, error_pointer) handle_cf_error(error_pointer) Security.SecTransformSetAttribute( sec_transform, Security.kSecTransformInputAttributeName, cf_data, error_pointer ) handle_cf_error(error_pointer) ciphertext = Security.SecTransformExecute(sec_transform, error_pointer) handle_cf_error(error_pointer) return CFHelpers.cf_data_to_bytes(ciphertext) finally: if cf_dict: CoreFoundation.CFRelease(cf_dict) if cf_key: CoreFoundation.CFRelease(cf_key) if cf_data: CoreFoundation.CFRelease(cf_data) if cf_iv: CoreFoundation.CFRelease(cf_iv) if sec_key: CoreFoundation.CFRelease(sec_key) if sec_transform: CoreFoundation.CFRelease(sec_transform) def _decrypt(cipher, key, data, iv, padding): """ Decrypts AES/RC4/RC2/3DES/DES ciphertext :param cipher: A kSecAttrKeyType* value that specifies the cipher to use :param key: The encryption key - a byte string 5-16 bytes long :param data: The ciphertext - a byte string :param iv: The initialization vector - a byte string - unused for RC4 :param padding: The padding mode to use, specified as a kSecPadding*Key value - unused for RC4 :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the plaintext """ if not isinstance(key, byte_cls): raise TypeError(pretty_message( ''' key must be a byte string, not %s ''', type_name(key) )) if not isinstance(data, byte_cls): raise TypeError(pretty_message( ''' data must be a byte string, not %s ''', type_name(data) )) if cipher != Security.kSecAttrKeyTypeRC4 and not isinstance(iv, byte_cls): raise TypeError(pretty_message( ''' iv must be a byte string, not %s ''', type_name(iv) )) if cipher != Security.kSecAttrKeyTypeRC4 and not padding: raise ValueError('padding must be specified') cf_dict = None cf_key = None cf_data = None cf_iv = None sec_key = None sec_transform = None try: cf_dict = CFHelpers.cf_dictionary_from_pairs([(Security.kSecAttrKeyType, cipher)]) cf_key = CFHelpers.cf_data_from_bytes(key) cf_data = CFHelpers.cf_data_from_bytes(data) error_pointer = new(CoreFoundation, 'CFErrorRef *') sec_key = Security.SecKeyCreateFromData(cf_dict, cf_key, error_pointer) handle_cf_error(error_pointer) sec_transform = Security.SecDecryptTransformCreate(sec_key, error_pointer) handle_cf_error(error_pointer) if cipher != Security.kSecAttrKeyTypeRC4: Security.SecTransformSetAttribute(sec_transform, Security.kSecModeCBCKey, null(), error_pointer) handle_cf_error(error_pointer) Security.SecTransformSetAttribute(sec_transform, Security.kSecPaddingKey, padding, error_pointer) handle_cf_error(error_pointer) cf_iv = CFHelpers.cf_data_from_bytes(iv) Security.SecTransformSetAttribute(sec_transform, Security.kSecIVKey, cf_iv, error_pointer) handle_cf_error(error_pointer) Security.SecTransformSetAttribute( sec_transform, Security.kSecTransformInputAttributeName, cf_data, error_pointer ) handle_cf_error(error_pointer) plaintext = Security.SecTransformExecute(sec_transform, error_pointer) handle_cf_error(error_pointer) return CFHelpers.cf_data_to_bytes(plaintext) finally: if cf_dict: CoreFoundation.CFRelease(cf_dict) if cf_key: CoreFoundation.CFRelease(cf_key) if cf_data: CoreFoundation.CFRelease(cf_data) if cf_iv: CoreFoundation.CFRelease(cf_iv) if sec_key: CoreFoundation.CFRelease(sec_key) if sec_transform: CoreFoundation.CFRelease(sec_transform)