Blowfish加密解密的Python实现方法，blowfishpython,Blowfish加密解密

Blowfish加密解密的Python实现方法，blowfishpython,Blowfish加密解密

Blowfish加密解密的Python实现方法，这段代码中的一些方法很好用。对加密解密等安全方面有兴趣的朋友一定要看看这段python代码。虽然没在正式环境下做过测试使用，但是我借鉴了其中的一些方法，完成了我的工作需要。

import struct, types__author__ = "Michael Gilfix <mgilfix@eecs.tufts.edu>"class Blowfish:    """Blowfish encryption Scheme    This class implements the encryption and decryption    functionality of the Blowfish cipher.    Public functions:        def __init__ (self, key)            Creates an instance of blowfish using 'key'            as the encryption key. Key is a string of            length ranging from 8 to 56 bytes (64 to 448            bits). Once the instance of the object is            created, the key is no longer necessary.        def encrypt (self, data):            Encrypt an 8 byte (64-bit) block of text            where 'data' is an 8 byte string. Returns an            8-byte encrypted string.        def decrypt (self, data):            Decrypt an 8 byte (64-bit) encrypted block            of text, where 'data' is the 8 byte encrypted            string. Returns an 8-byte string of plaintext.        def cipher (self, xl, xr, direction):            Encrypts a 64-bit block of data where xl is            the upper 32-bits and xr is the lower 32-bits.            'direction' is the direction to apply the            cipher, either ENCRYPT or DECRYPT constants.            returns a tuple of either encrypted or decrypted            data of the left half and right half of the            64-bit block.        def initCTR(self):            Initializes CTR engine for encryption or decryption.                    def encryptCTR(self, data):            Encrypts an arbitrary string and returns the            encrypted string. The method can be called successively            for multiple string blocks.                    def decryptCTR(self, data):            Decrypts a string encrypted with encryptCTR() and            returns the decrypted string.                Private members:        def __round_func (self, xl)            Performs an obscuring function on the 32-bit            block of data 'xl', which is the left half of            the 64-bit block of data. Returns the 32-bit            result as a long integer.    """    # Cipher directions    ENCRYPT = 0    DECRYPT = 1    # For the __round_func    modulus = long (2) ** 32    def __init__ (self, key):        if not key or len (key) < 8 or len (key) > 56:            raise RuntimeError, "Attempted to initialize Blowfish cipher with key of invalid length: %s" % len (key)        self.p_boxes = [            0x243F6A88, 0x85A308D3, 0x13198A2E, 0x03707344,            0xA4093822, 0x299F31D0, 0x082EFA98, 0xEC4E6C89,            0x452821E6, 0x38D01377, 0xBE5466CF, 0x34E90C6C,            0xC0AC29B7, 0xC97C50DD, 0x3F84D5B5, 0xB5470917,            0x9216D5D9, 0x8979FB1B        ]        self.s_boxes = [            [                0xD1310BA6, 0x98DFB5AC, 0x2FFD72DB, 0xD01ADFB7,                0xB8E1AFED, 0x6A267E96, 0xBA7C9045, 0xF12C7F99,                0x24A19947, 0xB3916CF7, 0x0801F2E2, 0x858EFC16,                0x636920D8, 0x71574E69, 0xA458FEA3, 0xF4933D7E,                0x0D95748F, 0x728EB658, 0x718BCD58, 0x82154AEE,                0x7B54A41D, 0xC25A59B5, 0x9C30D539, 0x2AF26013,                0xC5D1B023, 0x286085F0, 0xCA417918, 0xB8DB38EF,                0x8E79DCB0, 0x603A180E, 0x6C9E0E8B, 0xB01E8A3E,                0xD71577C1, 0xBD314B27, 0x78AF2FDA, 0x55605C60,                0xE65525F3, 0xAA55AB94, 0x57489862, 0x63E81440,                0x55CA396A, 0x2AAB10B6, 0xB4CC5C34, 0x1141E8CE,                0xA15486AF, 0x7C72E993, 0xB3EE1411, 0x636FBC2A,                0x2BA9C55D, 0x741831F6, 0xCE5C3E16, 0x9B87931E,                0xAFD6BA33, 0x6C24CF5C, 0x7A325381, 0x28958677,                0x3B8F4898, 0x6B4BB9AF, 0xC4BFE81B, 0x66282193,                0x61D809CC, 0xFB21A991, 0x487CAC60, 0x5DEC8032,                0xEF845D5D, 0xE98575B1, 0xDC262302, 0xEB651B88,                0x23893E81, 0xD396ACC5, 0x0F6D6FF3, 0x83F44239,                0x2E0B4482, 0xA4842004, 0x69C8F04A, 0x9E1F9B5E,                0x21C66842, 0xF6E96C9A, 0x670C9C61, 0xABD388F0,                0x6A51A0D2, 0xD8542F68, 0x960FA728, 0xAB5133A3,                0x6EEF0B6C, 0x137A3BE4, 0xBA3BF050, 0x7EFB2A98,                0xA1F1651D, 0x39AF0176, 0x66CA593E, 0x82430E88,                0x8CEE8619, 0x456F9FB4, 0x7D84A5C3, 0x3B8B5EBE,                0xE06F75D8, 0x85C12073, 0x401A449F, 0x56C16AA6,                0x4ED3AA62, 0x363F7706, 0x1BFEDF72, 0x429B023D,                0x37D0D724, 0xD00A1248, 0xDB0FEAD3, 0x49F1C09B,                0x075372C9, 0x80991B7B, 0x25D479D8, 0xF6E8DEF7,                0xE3FE501A, 0xB6794C3B, 0x976CE0BD, 0x04C006BA,                0xC1A94FB6, 0x409F60C4, 0x5E5C9EC2, 0x196A2463,                0x68FB6FAF, 0x3E6C53B5, 0x1339B2EB, 0x3B52EC6F,                0x6DFC511F, 0x9B30952C, 0xCC814544, 0xAF5EBD09,                0xBEE3D004, 0xDE334AFD, 0x660F2807, 0x192E4BB3,                0xC0CBA857, 0x45C8740F, 0xD20B5F39, 0xB9D3FBDB,                0x5579C0BD, 0x1A60320A, 0xD6A100C6, 0x402C7279,                0x679F25FE, 0xFB1FA3CC, 0x8EA5E9F8, 0xDB3222F8,                0x3C7516DF, 0xFD616B15, 0x2F501EC8, 0xAD0552AB,                0x323DB5FA, 0xFD238760, 0x53317B48, 0x3E00DF82,                0x9E5C57BB, 0xCA6F8CA0, 0x1A87562E, 0xDF1769DB,                0xD542A8F6, 0x287EFFC3, 0xAC6732C6, 0x8C4F5573,                0x695B27B0, 0xBBCA58C8, 0xE1FFA35D, 0xB8F011A0,                0x10FA3D98, 0xFD2183B8, 0x4AFCB56C, 0x2DD1D35B,                0x9A53E479, 0xB6F84565, 0xD28E49BC, 0x4BFB9790,                0xE1DDF2DA, 0xA4CB7E33, 0x62FB1341, 0xCEE4C6E8,                0xEF20CADA, 0x36774C01, 0xD07E9EFE, 0x2BF11FB4,                0x95DBDA4D, 0xAE909198, 0xEAAD8E71, 0x6B93D5A0,                0xD08ED1D0, 0xAFC725E0, 0x8E3C5B2F, 0x8E7594B7,                0x8FF6E2FB, 0xF2122B64, 0x8888B812, 0x900DF01C,                0x4FAD5EA0, 0x688FC31C, 0xD1CFF191, 0xB3A8C1AD,                0x2F2F2218, 0xBE0E1777, 0xEA752DFE, 0x8B021FA1,                0xE5A0CC0F, 0xB56F74E8, 0x18ACF3D6, 0xCE89E299,                0xB4A84FE0, 0xFD13E0B7, 0x7CC43B81, 0xD2ADA8D9,                0x165FA266, 0x80957705, 0x93CC7314, 0x211A1477,                0xE6AD2065, 0x77B5FA86, 0xC75442F5, 0xFB9D35CF,                0xEBCDAF0C, 0x7B3E89A0, 0xD6411BD3, 0xAE1E7E49,                0x00250E2D, 0x2071B35E, 0x226800BB, 0x57B8E0AF,                0x2464369B, 0xF009B91E, 0x5563911D, 0x59DFA6AA,                0x78C14389, 0xD95A537F, 0x207D5BA2, 0x02E5B9C5,                0x83260376, 0x6295CFA9, 0x11C81968, 0x4E734A41,                0xB3472DCA, 0x7B14A94A, 0x1B510052, 0x9A532915,                0xD60F573F, 0xBC9BC6E4, 0x2B60A476, 0x81E67400,                0x08BA6FB5, 0x571BE91F, 0xF296EC6B, 0x2A0DD915,                0xB6636521, 0xE7B9F9B6, 0xFF34052E, 0xC5855664,                0x53B02D5D, 0xA99F8FA1, 0x08BA4799, 0x6E85076A            ],            [                0x4B7A70E9, 0xB5B32944, 0xDB75092E, 0xC4192623,                0xAD6EA6B0, 0x49A7DF7D, 0x9CEE60B8, 0x8FEDB266,                0xECAA8C71, 0x699A17FF, 0x5664526C, 0xC2B19EE1,                0x193602A5, 0x75094C29, 0xA0591340, 0xE4183A3E,                0x3F54989A, 0x5B429D65, 0x6B8FE4D6, 0x99F73FD6,                0xA1D29C07, 0xEFE830F5, 0x4D2D38E6, 0xF0255DC1,                0x4CDD2086, 0x8470EB26, 0x6382E9C6, 0x021ECC5E,                0x09686B3F, 0x3EBAEFC9, 0x3C971814, 0x6B6A70A1,                0x687F3584, 0x52A0E286, 0xB79C5305, 0xAA500737,                0x3E07841C, 0x7FDEAE5C, 0x8E7D44EC, 0x5716F2B8,                0xB03ADA37, 0xF0500C0D, 0xF01C1F04, 0x0200B3FF,                0xAE0CF51A, 0x3CB574B2, 0x25837A58, 0xDC0921BD,                0xD19113F9, 0x7CA92FF6, 0x94324773, 0x22F54701,                0x3AE5E581, 0x37C2DADC, 0xC8B57634, 0x9AF3DDA7,                0xA9446146, 0x0FD0030E, 0xECC8C73E, 0xA4751E41,                0xE238CD99, 0x3BEA0E2F, 0x3280BBA1, 0x183EB331,                0x4E548B38, 0x4F6DB908, 0x6F420D03, 0xF60A04BF,                0x2CB81290, 0x24977C79, 0x5679B072, 0xBCAF89AF,                0xDE9A771F, 0xD9930810, 0xB38BAE12, 0xDCCF3F2E,                0x5512721F, 0x2E6B7124, 0x501ADDE6, 0x9F84CD87,                0x7A584718, 0x7408DA17, 0xBC9F9ABC, 0xE94B7D8C,                0xEC7AEC3A, 0xDB851DFA, 0x63094366, 0xC464C3D2,                0xEF1C1847, 0x3215D908, 0xDD433B37, 0x24C2BA16,                0x12A14D43, 0x2A65C451, 0x50940002, 0x133AE4DD,                0x71DFF89E, 0x10314E55, 0x81AC77D6, 0x5F11199B,     25aa           0x043556F1, 0xD7A3C76B, 0x3C11183B, 0x5924A509,                0xF28FE6ED, 0x97F1FBFA, 0x9EBABF2C, 0x1E153C6E,                0x86E34570, 0xEAE96FB1, 0x860E5E0A, 0x5A3E2AB3,                0x771FE71C, 0x4E3D06FA, 0x2965DCB9, 0x99E71D0F,                0x803E89D6, 0x5266C825, 0x2E4CC978, 0x9C10B36A,                0xC6150EBA, 0x94E2EA78, 0xA5FC3C53, 0x1E0A2DF4,                0xF2F74EA7, 0x361D2B3D, 0x1939260F, 0x19C27960,                0x5223A708, 0xF71312B6, 0xEBADFE6E, 0xEAC31F66,                0xE3BC4595, 0xA67BC883, 0xB17F37D1, 0x018CFF28,                0xC332DDEF, 0xBE6C5AA5, 0x65582185, 0x68AB9802,                0xEECEA50F, 0xDB2F953B, 0x2AEF7DAD, 0x5B6E2F84,                0x1521B628, 0x29076170, 0xECDD4775, 0x619F1510,                0x13CCA830, 0xEB61BD96, 0x0334FE1E, 0xAA0363CF,                0xB5735C90, 0x4C70A239, 0xD59E9E0B, 0xCBAADE14,                0xEECC86BC, 0x60622CA7, 0x9CAB5CAB, 0xB2F3846E,                0x648B1EAF, 0x19BDF0CA, 0xA02369B9, 0x655ABB50,                0x40685A32, 0x3C2AB4B3, 0x319EE9D5, 0xC021B8F7,                0x9B540B19, 0x875FA099, 0x95F7997E, 0x623D7DA8,                0xF837889A, 0x97E32D77, 0x11ED935F, 0x16681281,                0x0E358829, 0xC7E61FD6, 0x96DEDFA1, 0x7858BA99,                0x57F584A5, 0x1B227263, 0x9B83C3FF, 0x1AC24696,                0xCDB30AEB, 0x532E3054, 0x8FD948E4, 0x6DBC3128,                0x58EBF2EF, 0x34C6FFEA, 0xFE28ED61, 0xEE7C3C73,                0x5D4A14D9, 0xE864B7E3, 0x42105D14, 0x203E13E0,                0x45EEE2B6, 0xA3AAABEA, 0xDB6C4F15, 0xFACB4FD0,                0xC742F442, 0xEF6ABBB5, 0x654F3B1D, 0x41CD2105,                0xD81E799E, 0x86854DC7, 0xE44B476A, 0x3D816250,                0xCF62A1F2, 0x5B8D2646, 0xFC8883A0, 0xC1C7B6A3,                0x7F1524C3, 0x69CB7492, 0x47848A0B, 0x5692B285,                0x095BBF00, 0xAD19489D, 0x1462B174, 0x23820E00,                0x58428D2A, 0x0C55F5EA, 0x1DADF43E, 0x233F7061,                0x3372F092, 0x8D937E41, 0xD65FECF1, 0x6C223BDB,                0x7CDE3759, 0xCBEE7460, 0x4085F2A7, 0xCE77326E,                0xA6078084, 0x19F8509E, 0xE8EFD855, 0x61D99735,                0xA969A7AA, 0xC50C06C2, 0x5A04ABFC, 0x800BCADC,                0x9E447A2E, 0xC3453484, 0xFDD56705, 0x0E1E9EC9,                0xDB73DBD3, 0x105588CD, 0x675FDA79, 0xE3674340,                0xC5C43465, 0x713E38D8, 0x3D28F89E, 0xF16DFF20,                0x153E21E7, 0x8FB03D4A, 0xE6E39F2B, 0xDB83ADF7            ],            [                0xE93D5A68, 0x948140F7, 0xF64C261C, 0x94692934,                0x411520F7, 0x7602D4F7, 0xBCF46B2E, 0xD4A20068,                0xD4082471, 0x3320F46A, 0x43B7D4B7, 0x500061AF,                0x1E39F62E, 0x97244546, 0x14214F74, 0xBF8B8840,                0x4D95FC1D, 0x96B591AF, 0x70F4DDD3, 0x66A02F45,                0xBFBC09EC, 0x03BD9785, 0x7FAC6DD0, 0x31CB8504,                0x96EB27B3, 0x55FD3941, 0xDA2547E6, 0xABCA0A9A,                0x28507825, 0x530429F4, 0x0A2C86DA, 0xE9B66DFB,                0x68DC1462, 0xD7486900, 0x680EC0A4, 0x27A18DEE,                0x4F3FFEA2, 0xE887AD8C, 0xB58CE006, 0x7AF4D6B6,                0xAACE1E7C, 0xD3375FEC, 0xCE78A399, 0x406B2A42,                0x20FE9E35, 0xD9F385B9, 0xEE39D7AB, 0x3B124E8B,                0x1DC9FAF7, 0x4B6D1856, 0x26A36631, 0xEAE397B2,                0x3A6EFA74, 0xDD5B4332, 0x6841E7F7, 0xCA7820FB,                0xFB0AF54E, 0xD8FEB397, 0x454056AC, 0xBA489527,                0x55533A3A, 0x20838D87, 0xFE6BA9B7, 0xD096954B,                0x55A867BC, 0xA1159A58, 0xCCA92963, 0x99E1DB33,                0xA62A4A56, 0x3F3125F9, 0x5EF47E1C, 0x9029317C,                0xFDF8E802, 0x04272F70, 0x80BB155C, 0x05282CE3,                0x95C11548, 0xE4C66D22, 0x48C1133F, 0xC70F86DC,                0x07F9C9EE, 0x41041F0F, 0x404779A4, 0x5D886E17,                0x325F51EB, 0xD59BC0D1, 0xF2BCC18F, 0x41113564,                0x257B7834, 0x602A9C60, 0xDFF8E8A3, 0x1F636C1B,                0x0E12B4C2, 0x02E1329E, 0xAF664FD1, 0xCAD18115,                0x6B2395E0, 0x333E92E1, 0x3B240B62, 0xEEBEB922,                0x85B2A20E, 0xE6BA0D99, 0xDE720C8C, 0x2DA2F728,                0xD0127845, 0x95B794FD, 0x647D0862, 0xE7CCF5F0,                0x5449A36F, 0x877D48FA, 0xC39DFD27, 0xF33E8D1E,                0x0A476341, 0x992EFF74, 0x3A6F6EAB, 0xF4F8FD37,                0xA812DC60, 0xA1EBDDF8, 0x991BE14C, 0xDB6E6B0D,                0xC67B5510, 0x6D672C37, 0x2765D43B, 0xDCD0E804,                0xF1290DC7, 0xCC00FFA3, 0xB5390F92, 0x690FED0B,                0x667B9FFB, 0xCEDB7D9C, 0xA091CF0B, 0xD9155EA3,                0xBB132F88, 0x515BAD24, 0x7B9479BF, 0x763BD6EB,                0x37392EB3, 0xCC115979, 0x8026E297, 0xF42E312D,                0x6842ADA7, 0xC66A2B3B, 0x12754CCC, 0x782EF11C,                0x6A124237, 0xB79251E7, 0x06A1BBE6, 0x4BFB6350,                0x1A6B1018, 0x11CAEDFA, 0x3D25BDD8, 0xE2E1C3C9,                0x44421659, 0x0A121386, 0xD90CEC6E, 0xD5ABEA2A,                0x64AF674E, 0xDA86A85F, 0xBEBFE988, 0x64E4C3FE,                0x9DBC8057, 0xF0F7C086, 0x60787BF8, 0x6003604D,                0xD1FD8346, 0xF6381FB0, 0x7745AE04, 0xD736FCCC,                0x83426B33, 0xF01EAB71, 0xB0804187, 0x3C005E5F,                0x77A057BE, 0xBDE8AE24, 0x55464299, 0xBF582E61,                0x4E58F48F, 0xF2DDFDA2, 0xF474EF38, 0x8789BDC2,                0x5366F9C3, 0xC8B38E74, 0xB475F255, 0x46FCD9B9,                0x7AEB2661, 0x8B1DDF84, 0x846A0E79, 0x915F95E2,                0x466E598E, 0x20B45770, 0x8CD55591, 0xC902DE4C,                0xB90BACE1, 0xBB8205D0, 0x11A86248, 0x7574A99E,                0xB77F19B6, 0xE0A9DC09, 0x662D09A1, 0xC4324633,                0xE85A1F02, 0x09F0BE8C, 0x4A99A025, 0x1D6EFE10,                0x1AB93D1D, 0x0BA5A4DF, 0xA186F20F, 0x2868F169,                0xDCB7DA83, 0x573906FE, 0xA1E2CE9B, 0x4FCD7F52,                0x50115E01, 0xA70683FA, 0xA002B5C4, 0x0DE6D027,                0x9AF88C27, 0x773F8641, 0xC3604C06, 0x61A806B5,                0xF0177A28, 0xC0F586E0, 0x006058AA, 0x30DC7D62,                0x11E69ED7, 0x2338EA63, 0x53C2DD94, 0xC2C21634,                0xBBCBEE56, 0x90BCB6DE, 0xEBFC7DA1, 0xCE591D76,                0x6F05E409, 0x4B7C0188, 0x39720A3D, 0x7C927C24,                0x86E3725F, 0x724D9DB9, 0x1AC15BB4, 0xD39EB8FC,                0xED545578, 0x08FCA5B5, 0xD83D7CD3, 0x4DAD0FC4,                0x1E50EF5E, 0xB161E6F8, 0xA28514D9, 0x6C51133C,                0x6FD5C7E7, 0x56E14EC4, 0x362ABFCE, 0xDDC6C837,                0xD79A3234, 0x92638212, 0x670EFA8E, 0x406000E0            ],            [                0x3A39CE37, 0xD3FAF5CF, 0xABC27737, 0x5AC52D1B,                0x5CB0679E, 0x4FA33742, 0xD3822740, 0x99BC9BBE,                0xD5118E9D, 0xBF0F7315, 0xD62D1C7E, 0xC700C47B,                0xB78C1B6B, 0x21A19045, 0xB26EB1BE, 0x6A366EB4,                0x5748AB2F, 0xBC946E79, 0xC6A376D2, 0x6549C2C8,                0x530FF8EE, 0x468DDE7D, 0xD5730A1D, 0x4CD04DC6,                0x2939BBDB, 0xA9BA4650, 0xAC9526E8, 0xBE5EE304,                0xA1FAD5F0, 0x6A2D519A, 0x63EF8CE2, 0x9A86EE22,                0xC089C2B8, 0x43242EF6, 0xA51E03AA, 0x9CF2D0A4,                0x83C061BA, 0x9BE96A4D, 0x8FE51550, 0xBA645BD6,                0x2826A2F9, 0xA73A3AE1, 0x4BA99586, 0xEF5562E9,                0xC72FEFD3, 0xF752F7DA, 0x3F046F69, 0x77FA0A59,                0x80E4A915, 0x87B08601, 0x9B09E6AD, 0x3B3EE593,                0xE990FD5A, 0x9E34D797, 0x2CF0B7D9, 0x022B8B51,                0x96D5AC3A, 0x017DA67D, 0xD1CF3ED6, 0x7C7D2D28,                0x1F9F25CF, 0xADF2B89B, 0x5AD6B472, 0x5A88F54C,                0xE029AC71, 0xE019A5E6, 0x47B0ACFD, 0xED93FA9B,                0xE8D3C48D, 0x283B57CC, 0xF8D56629, 0x79132E28,                0x785F0191, 0xED756055, 0xF7960E44, 0xE3D35E8C,                0x15056DD4, 0x88F46DBA, 0x03A16125, 0x0564F0BD,                0xC3EB9E15, 0x3C9057A2, 0x97271AEC, 0xA93A072A,                0x1B3F6D9B, 0x1E6321F5, 0xF59C66FB, 0x26DCF319,                0x7533D928, 0xB155FDF5, 0x03563482, 0x8ABA3CBB,                0x28517711, 0xC20AD9F8, 0xABCC5167, 0xCCAD925F,                0x4DE81751, 0x3830DC8E, 0x379D5862, 0x9320F991,                0xEA7A90C2, 0xFB3E7BCE, 0x5121CE64, 0x774FBE32,                0xA8B6E37E, 0xC3293D46, 0x48DE5369, 0x6413E680,                0xA2AE0810, 0xDD6DB224, 0x69852DFD, 0x09072166,                0xB39A460A, 0x6445C0DD, 0x586CDECF, 0x1C20C8AE,                0x5BBEF7DD, 0x1B588D40, 0xCCD2017F, 0x6BB4E3BB,                0xDDA26A7E, 0x3A59FF45, 0x3E350A44, 0xBCB4CDD5,                0x72EACEA8, 0xFA6484BB, 0x8D6612AE, 0xBF3C6F47,                0xD29BE463, 0x542F5D9E, 0xAEC2771B, 0xF64E6370,                0x740E0D8D, 0xE75B1357, 0xF8721671, 0xAF537D5D,                0x4040CB08, 0x4EB4E2CC, 0x34D2466A, 0x0115AF84,                0xE1B00428, 0x95983A1D, 0x06B89FB4, 0xCE6EA048,                0x6F3F3B82, 0x3520AB82, 0x011A1D4B, 0x277227F8,                0x611560B1, 0xE7933FDC, 0xBB3A792B, 0x344525BD,                0xA08839E1, 0x51CE794B, 0x2F32C9B7, 0xA01FBAC9,                0xE01CC87E, 0xBCC7D1F6, 0xCF0111C3, 0xA1E8AAC7,                0x1A908749, 0xD44FBD9A, 0xD0DADECB, 0xD50ADA38,                0x0339C32A, 0xC6913667, 0x8DF9317C, 0xE0B12B4F,                0xF79E59B7, 0x43F5BB3A, 0xF2D519FF, 0x27D9459C,                0xBF97222C, 0x15E6FC2A, 0x0F91FC71, 0x9B941525,                0xFAE59361, 0xCE1c40B69CEB, 0xC2A86459, 0x12BAA8D1,                0xB6C1075E, 0xE3056A0C, 0x10D25065, 0xCB03A442,                0xE0EC6E0E, 0x1698DB3B, 0x4C98A0BE, 0x3278E964,                0x9F1F9532, 0xE0D392DF, 0xD3A0342B, 0x8971F21E,                0x1B0A7441, 0x4BA3348C, 0xC5BE7120, 0xC37632D8,                0xDF359F8D, 0x9B992F2E, 0xE60B6F47, 0x0FE3F11D,                0xE54CDA54, 0x1EDAD891, 0xCE6279CF, 0xCD3E7E6F,                0x1618B166, 0xFD2C1D05, 0x848FD2C5, 0xF6FB2299,                0xF523F357, 0xA6327623, 0x93A83531, 0x56CCCD02,                0xACF08162, 0x5A75EBB5, 0x6E163697, 0x88D273CC,                0xDE966292, 0x81B949D0, 0x4C50901B, 0x71C65614,                0xE6C6C7BD, 0x327A140A, 0x45E1D006, 0xC3F27B9A,                0xC9AA53FD, 0x62A80F00, 0xBB25BFE2, 0x35BDD2F6,                0x71126905, 0xB2040222, 0xB6CBCF7C, 0xCD769C2B,                0x53113EC0, 0x1640E3D3, 0x38ABBD60, 0x2547ADF0,                0xBA38209C, 0xF746CE76, 0x77AFA1C5, 0x20756060,                0x85CBFE4E, 0x8AE88DD8, 0x7AAAF9B0, 0x4CF9AA7E,                0x1948C25C, 0x02FB8A8C, 0x01C36AE4, 0xD6EBE1F9,                0x90D4F869, 0xA65CDEA0, 0x3F09252D, 0xC208E69F,                0xB74E6132, 0xCE77E25B, 0x578FDFE3, 0x3AC372E6            ]        ]        # Cycle through the p-boxes and round-robin XOR the        # key with the p-boxes        key_len = len (key)        index = 0        for i in range (len (self.p_boxes)):            val = (ord (key[index % key_len]) << 24) + \                  (ord (key[(index + 1) % key_len]) << 16) + \                  (ord (key[(index + 2) % key_len]) << 8) + \                   ord (key[(index + 3) % key_len])            self.p_boxes[i] = self.p_boxes[i] ^ val            index = index + 4        # For the chaining process        l, r = 0, 0        # Begin chain replacing the p-boxes        for i in range (0, len (self.p_boxes), 2):            l, r = self.cipher (l, r, self.ENCRYPT)            self.p_boxes[i] = l            self.p_boxes[i + 1] = r        # Chain replace the s-boxes        for i in range (len (self.s_boxes)):            for j in range (0, len (self.s_boxes[i]), 2):                l, r = self.cipher (l, r, self.ENCRYPT)                self.s_boxes[i][j] = l                self.s_boxes[i][j + 1] = r        self.initCTR()    def cipher (self, xl, xr, direction):        """Encryption primitive"""        if direction == self.ENCRYPT:            for i in range (16):                xl = xl ^ self.p_boxes[i]                xr = self.__round_func (xl) ^ xr                xl, xr = xr, xl            xl, xr = xr, xl            xr = xr ^ self.p_boxes[16]            xl = xl ^ self.p_boxes[17]        else:            for i in range (17, 1, -1):                xl = xl ^ self.p_boxes[i]                xr = self.__round_func (xl) ^ xr                xl, xr = xr, xl            xl, xr = xr, xl            xr = xr ^ self.p_boxes[1]            xl = xl ^ self.p_boxes[0]        return xl, xr    def __round_func (self, xl):        a = (xl & 0xFF000000) >> 24        b = (xl & 0x00FF0000) >> 16        c = (xl & 0x0000FF00) >> 8        d = xl & 0x000000FF        # Perform all ops as longs then and out the last 32-bits to        # obtain the integer        f = (long (self.s_boxes[0][a]) + long (self.s_boxes[1][b])) % self.modulus        f = f ^ long (self.s_boxes[2][c])        f = f + long (self.s_boxes[3][d])        f = (f % self.modulus) & 0xFFFFFFFF        return f    def encrypt (self, data):        if not len (data) == 8:            raise RuntimeError, "Attempted to encrypt data of invalid block length: %s" % len(data)        # Use big endianess since that's what everyone else uses        xl = ord (data[3]) | (ord (data[2]) << 8) | (ord (data[1]) << 16) | (ord (data[0]) << 24)        xr = ord (data[7]) | (ord (data[6]) << 8) | (ord (data[5]) << 16) | (ord (data[4]) << 24)        cl, cr = self.cipher (xl, xr, self.ENCRYPT)        chars = ''.join ([            chr ((cl >> 24) & 0xFF), chr ((cl >> 16) & 0xFF), chr ((cl >> 8) & 0xFF), chr (cl & 0xFF),            chr ((cr >> 24) & 0xFF), chr ((cr >> 16) & 0xFF), chr ((cr >> 8) & 0xFF), chr (cr & 0xFF)        ])        return chars    def decrypt (self, data):        if not len (data) == 8:            raise RuntimeError, "Attempted to encrypt data of invalid block length: %s" % len(data)        # Use big endianess since that's what everyone else uses        cl = ord (data[3]) | (ord (data[2]) << 8) | (ord (data[1]) << 16) | (ord (data[0]) << 24)        cr = ord (data[7]) | (ord (data[6]) << 8) | (ord (data[5]) << 16) | (ord (data[4]) << 24)        xl, xr = self.cipher (cl, cr, self.DECRYPT)        chars = ''.join ([            chr ((xl >> 24) & 0xFF), chr ((xl >> 16) & 0xFF), chr ((xl >> 8) & 0xFF), chr (xl & 0xFF),            chr ((xr >> 24) & 0xFF), chr ((xr >> 16) & 0xFF), chr ((xr >> 8) & 0xFF), chr (xr & 0xFF)        ])        return chars    # ==== CBC Mode ==www.iplaypy.com==    def initCBC(self, iv=0):        """Initializes CBC mode of the cypher"""        assert struct.calcsize("Q") == self.block_size()        self.cbc_iv = struct.pack("Q", iv)    def encryptCBC(self, data):        """        Encrypts a buffer of data using CBC mode. Multiple successive buffers        (belonging to the same logical stream of buffers) can be encrypted        with this method one after the other without any intermediate work.        Each buffer must be a multiple of 8-octets (64-bits) in length.        """        if type(data) != types.StringType:            raise RuntimeError, "Can only work on 8-bit strings"        if (len(data) % 8) != 0:            raise RuntimeError, "Can only work with data in 64-bit multiples in CBC mode"        xor = lambda t: ord(t[0]) ^ ord(t[1])        result = ''        block_size = self.block_size()        for i in range(0, len(data), block_size):            p_block = data[i:i+block_size]            pair = zip(p_block, self.cbc_iv)            j_block = ''.join(map(chr, map(xor, pair)))            c_block = self.encrypt(j_block)            result += c_block            self.cbc_iv = c_block        return result    def decryptCBC(self, data):        if type(data) != types.StringType:            raise RuntimeError, "Can only work on 8-bit strings"        if (len(data) % 8) != 0:            raise RuntimeError, "Can only work with data in 64-bit multiples in CBC mode"        xor = lambda t: ord(t[0]) ^ ord(t[1])        result = ''        block_size = self.block_size()        for i in range(0, len(data), block_size):            c_block = data[i:i+block_size]            j_block = self.decrypt(c_block)            pair = zip(j_block, self.cbc_iv)            p77e_block = ''.join(map(chr, map(xor, pair)))            result += p_block            self.cbc_iv = c_block        return result    # ==== CTR Mode ====    def initCTR(self, iv=0):        """Initializes CTR mode of the cypher"""        assert struct.calcsize("Q") == self.block_size()        self.ctr_iv = iv        self._calcCTRBUF()    def _calcCTRBUF(self):        """Calculates one block of CTR keystream"""        self.ctr_cks = self.encrypt(struct.pack("Q", self.ctr_iv)) # keystream block        self.ctr_iv += 1        self.ctr_pos = 0    def _nextCTRByte(self):        """Returns one byte of CTR keystream"""        b = ord(self.ctr_cks[self.ctr_pos])        self.ctr_pos += 1        if self.ctr_pos >= len(self.ctr_cks):            self._calcCTRBUF()        return b    def encryptCTR(self, data):        """        Encrypts a buffer of data with CTR mode. Multiple successive buffers        (belonging to the same logical stream of buffers) can be encrypted        with this method one after the other without any intermediate work.        """        if type(data) != types.StringType:            raise RuntimeException, "Can only work on 8-bit strings"        result = []        for ch in data:            result.append(chr(ord(ch) ^ self._nextCTRByte()))        return "".join(result)    def decryptCTR(self, data):        return self.encryptCTR(data)    def block_size(self):        return 8    def key_length(self):        return 56    def key_bits(self):        return 56 * 8    @staticmethod    def testVectors():        import binascii        # for more vectors see http://www.schneier.com/code/vectors.txt        vectors = (            ('0000000000000000',        '0000000000000000',        '4EF997456198DD78'),            ('FFFFFFFFFFFFFFFF',        'FFFFFFFFFFFFFFFF'2000,        '51866FD5B85ECB8A'),            ('3000000000000000',        '1000000000000001',        '7D856F9A613063F2'),            ('1111111111111111',        '1111111111111111',        '2466DD878B963C9D'),            ('49E95D6D4CA229BF',        '02FE55778117F12A',        'CF9C5D7A4986ADB5'),            ('E0FEE0FEF1FEF1FE',        '0123456789ABCDEF',        'C39E072D9FAC631D'),            ('07A7137045DA2A16',        '3BDD119049372802',        '2EEDDA93FFD39C79'),        )        ok = True        for v in vectors:            c = Blowfish(binascii.a2b_hex(v[0]))            e = binascii.b2a_hex(c.encrypt(binascii.a2b_hex(v[1]))).upper()            if e != v[2]:                print "VECTOR TEST FAIL: expecting %s, got %s" % (repr(v), e)                ok = False        return ok        ############################################################### Module testingif __name__ == '__main__':    if not Blowfish.testVectors():        print "WARNING: The implementation doesn't pass algorithm test vectors!"    else:        print "The implementation passes algorithm test vectors (ECB)."    key = 'This is a test key'    cipher = Blowfish (key)    print "Testing encryption:"    xl = 123456    xr = 654321    print "\tPlain text: (%s, %s)" %(xl, xr)    cl, cr = cipher.cipher (xl, xr, cipher.ENCRYPT)    print "\tCrypted is: (%s, %s)" %(cl, cr)    dl, dr = cipher.cipher (cl, cr, cipher.DECRYPT)    print "\tUnencrypted is: (%s, %s)" %(dl, dr)    print "Testing block encrypt:"    text = 'testtest'    print "\tText:\t\t%s" %text    crypted = cipher.encrypt(text)    print "\tEncrypted:\t%s" % repr(crypted)    decrypted = cipher.decrypt(crypted)    print "\tDecrypted:\t%s" %decrypted        print "Testing CTR encrypt:"    cipher.initCTR()    text = "The quick brown fox jumps over the lazy dog"    print "\tText:\t\t", text    crypted = cipher.encryptCTR(text)    print "\tEncrypted:\t", repr(crypted)    cipher.initCTR()    decrypted = cipher.decryptCTR(crypted)    print "\tDecrypted:\t", decrypted    print "Testing CBC encrypt:"    cipher.initCBC()    text = "Owen's Ornery Old Oryx Obstructed Olga's Optics."    print "\tText:\t\t", text    crypted = cipher.encryptCBC(text)    print "\tEncrypted:\t", repr(crypted)    cipher.initCBC()    decrypted = cipher.decryptCBC(crypted)    print "\tDecrypted:\t", decrypted    print "Testing speed"    from time import time    t1 = time()    n = 0    tlen = 0    while True:        for i in xrange(1000):            tstr = "The quick brown fox jumps over the lazy dog %d" % i            enc = cipher.encryptCTR(tstr)            tlen += len(tstr)        n += 1000        t2 = time()        if t2 - t1 > 5:            break    t = t2 - t1    print "%d encryptions in %0.1f seconds: %0.1f enc/s, %0.1f bytes/s" % (n, t, n / t, tlen / t)

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