diff options
Diffstat (limited to 'pypride.py')
| -rw-r--r-- | pypride.py | 37 |
1 files changed, 34 insertions, 3 deletions
@@ -21,6 +21,37 @@ # # ============================================================================= +""" +PRIDE block cipher implementation + +USAGE EXAMPLE: +--------------- +Importing: +----------- +>>> from pypride import Pride + +Create a Pride object: +----------------------- +>>> key = "00000000000000000000000000000000".decode('hex') +>>> cipher = Pride(key) + +Encryption: +------------ +>>> plain = "0000000000000000".decode('hex') +>>> encrypted = cipher.encrypt(plain) +>>> encrypted.encode('hex') +'82b4109fcc70bd1f' + +Decryption: +------------ +>>> decrypted = cipher.decrypt(encrypted) +>>> decrypted.encode('hex') +'0000000000000000' + +This implementation is fully based on the report PRIDE was presented in (https://eprint.iacr.org/2014/453; specifically section 5.4). +Test vectors can be found in test-vectors.py and were taken from appendix J of that paper. +""" + class Pride: def __init__(self,key): @@ -84,15 +115,15 @@ class Pride: return number2string_N(state,8) -""" 4 to 4-bit S-Box and its inverse """ +# 4 to 4-bit S-Box and its inverse Sbox= [0x0,0x4,0x8,0xf,0x1,0x5,0xe,0x9,0x2,0x7,0xa,0xc,0xb,0xd,0x6,0x3] Sbox_inv = [Sbox.index(x) for x in xrange(16)] -""" 64-bit permutation P and its inverse """ +# 64-bit permutation P and its inverse PBox = [0, 16, 32, 48, 1, 17, 33, 49, 2, 18, 34, 50, 3, 19, 35, 51, 4, 20, 36, 52, 5, 21, 37, 53, 6, 22, 38, 54, 7, 23, 39, 55, 8, 24, 40, 56, 9, 25, 41, 57, 10, 26, 42, 58, 11, 27, 43, 59, 12, 28, 44, 60, 13, 29, 45, 61, 14, 30, 46, 62, 15, 31, 47, 63] PBox_inv = [PBox.index(x) for x in xrange(64)] -""" Matrices for permutation in the L layer """ +# Matrices for permutation in the L layer L0 = [[0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0], [0,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0], [0,0,0,0,0,0,1,0,0,0,1,0,0,0,1,0], |