Python实现的Blowfish加解密
fmms
13年前
Python实现的Blowfish加解密 <pre class="brush:python; toolbar: true; auto-links: false;"># # blowfish.py # Copyright (C) 2002 Michael Gilfix <mgilfix@eecs.tufts.edu> # # This module is open source; you can redistribute it and/or # modify it under the terms of the GPL or Artistic License. # These licenses are available at http://www.opensource.org # # This software must be used and distributed in accordance # with the law. The author claims no liability for its # misuse. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # # This software was modified by Ivan Voras: CTR cipher mode of # operation was added, together with testing and example code. # These changes are (c) 2007./08. Ivan Voras <ivoras@gmail.com> # These changes can be used, modified ad distributed under the # GPL or Artistic License, the same as the original module. # All disclaimers of warranty from the original module also # apply to these changes. # CBC mode contributed by Joel Edwards <joeledwards@gmail.com>, # under the same license conditions. """ Blowfish Encryption This module is a pure python implementation of Bruce Schneier's encryption scheme 'Blowfish'. Blowish is a 16-round Feistel Network cipher and offers substantial speed gains over DES. The key is a string of length anywhere between 64 and 448 bits, or equivalently 8 and 56 bytes. The encryption and decryption functions operate on 64-bit blocks, or 8 byte strings. Send questions, comments, bugs my way: Michael Gilfix <mgilfix@eecs.tufts.edu> The module has been expanded to include CTR stream encryption/decryption mode, built from the primitives from the orignal module. This change did not alter any of the base Blowfish code from the original author. The author of CTR changes is: Ivan Voras <ivoras@gmail.com> """ 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, 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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, 0xCEB69CEB, 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 ==== 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) p_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', '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 testing if __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)</pre>