| 0,0 → 1,77 |
|---|
| from blockcipher import * |
| import Crypto.Cipher.Blowfish |
| |
| def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=None): |
| """Create a new cipher object |
| |
| Blowfish using pycrypto for algo and pycryptoplus for ciphermode |
| |
| key = raw string containing the key |
| mode = Blowfish.MODE_ECB/CBC/CFB/OFB/CTR/CMAC, default is ECB |
| IV = IV as a raw string, default is "all zero" IV |
| -> only needed for CBC mode |
| counter = counter object (CryptoPlus.Util.util.Counter) |
| -> only needed for CTR mode |
| segment_size = amount of bits to use from the keystream in each chain part |
| -> supported values: multiple of 8 between 8 and the blocksize |
| of the cipher (only per byte access possible), default is 8 |
| -> only needed for CFB mode |
| |
| EXAMPLES: |
| ********** |
| IMPORTING: |
| ----------- |
| >>> from CryptoPlus.Cipher import Blowfish |
| |
| ECB EXAMPLE: http://www.schneier.com/code/vectors.txt |
| ------------- |
| >>> cipher = Blowfish.new(('0131D9619DC1376E').decode('hex')) |
| >>> ( cipher.encrypt(('5CD54CA83DEF57DA').decode('hex')) ).encode('hex') |
| 'b1b8cc0b250f09a0' |
| >>> ( cipher.decrypt((_).decode('hex')) ).encode('hex') |
| '5cd54ca83def57da' |
| |
| CBC, CFB, OFB EXAMPLE: http://www.schneier.com/code/vectors.txt |
| ---------------------- |
| >>> key = ('0123456789ABCDEFF0E1D2C3B4A59687').decode('hex') |
| >>> IV = ('FEDCBA9876543210').decode('hex') |
| >>> plaintext = ('37363534333231204E6F77206973207468652074696D6520').decode('hex') |
| >>> cipher = Blowfish.new(key,Blowfish.MODE_CBC,IV) |
| >>> ciphertext = cipher.encrypt(plaintext) |
| >>> (ciphertext).encode('hex').upper() |
| '6B77B4D63006DEE605B156E27403979358DEB9E7154616D9' |
| |
| |
| >>> key = '0123456789ABCDEFF0E1D2C3B4A59687'.decode('hex') |
| >>> iv = 'FEDCBA9876543210'.decode('hex') |
| >>> plaintext = '37363534333231204E6F77206973207468652074696D6520666F722000'.decode('hex') |
| |
| >>> cipher = Blowfish.new(key,Blowfish.MODE_CBC,iv) |
| >>> ciphertext = cipher.encrypt(plaintext) |
| >>> (ciphertext).encode('hex').upper() |
| '6B77B4D63006DEE605B156E27403979358DEB9E7154616D9' |
| |
| >>> cipher = Blowfish.new(key,Blowfish.MODE_CFB,iv,segment_size=64) |
| >>> ciphertext = cipher.encrypt(plaintext) |
| >>> (ciphertext).encode('hex').upper() |
| 'E73214A2822139CAF26ECF6D2EB9E76E3DA3DE04D1517200519D57A6C3' |
| |
| >>> cipher = Blowfish.new(key,Blowfish.MODE_OFB,iv) |
| >>> ciphertext = cipher.encrypt(plaintext) |
| >>> (ciphertext).encode('hex').upper() |
| 'E73214A2822139CA62B343CC5B65587310DD908D0C241B2263C2CF80DA' |
| """ |
| return Blowfish(key,mode,IV,counter,segment_size) |
| |
| class Blowfish(BlockCipher): |
| def __init__(self,key,mode,IV,counter,segment_size): |
| cipher_module = Crypto.Cipher.Blowfish.new |
| self.blocksize = 8 |
| BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size) |
| |
| def _test(): |
| import doctest |
| doctest.testmod() |
| |
| if __name__ == "__main__": |
| _test() |