| 0,0 → 1,59 |
|---|
| from blockcipher import * |
| import Crypto.Cipher.ARC2 |
| import Crypto |
| from pkg_resources import parse_version |
| |
| def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=None,effective_keylen=None): |
| """Create a new cipher object |
| |
| ARC2 using pycrypto for algo and pycryptoplus for ciphermode |
| |
| key = raw string containing the keys |
| mode = python_AES.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 |
| effective_keylen = how much bits to effectively use from the supplied key |
| -> will only be used when the pycrypto version on your system is >2.0.1 |
| |
| EXAMPLES: |
| ********** |
| IMPORTING: |
| ----------- |
| >>> from CryptoPlus.Cipher import ARC2 |
| |
| http://www.ietf.org/rfc/rfc2268.txt |
| Doctest will fail when using pycrypto 2.0.1 and older |
| ------------------------------------ |
| >>> key = "0000000000000000".decode('hex') |
| >>> plaintext = "0000000000000000".decode('hex') |
| >>> ek = 63 |
| >>> cipher = ARC2.new(key,ARC2.MODE_ECB,effective_keylen=ek) |
| >>> cipher.encrypt(plaintext).encode('hex') |
| 'ebb773f993278eff' |
| """ |
| return ARC2(key,mode,IV,counter,effective_keylen,segment_size) |
| |
| class ARC2(BlockCipher): |
| def __init__(self,key,mode,IV,counter,effective_keylen,segment_size): |
| # pycrypto versions newer than 2.0.1 will have support for "effective_keylen" |
| if parse_version(Crypto.__version__) <= parse_version("2.0.1"): |
| cipher_module = Crypto.Cipher.ARC2.new |
| args = {} |
| else: |
| cipher_module = Crypto.Cipher.ARC2.new |
| args = {'effective_keylen':effective_keylen} |
| self.blocksize = 8 |
| BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size,args) |
| |
| def _test(): |
| import doctest |
| doctest.testmod() |
| |
| if __name__ == "__main__": |
| _test() |