From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- python/PyECC/ecc/shacrypt.py | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 python/PyECC/ecc/shacrypt.py (limited to 'python/PyECC/ecc/shacrypt.py') diff --git a/python/PyECC/ecc/shacrypt.py b/python/PyECC/ecc/shacrypt.py new file mode 100644 index 000000000..69ee7b943 --- /dev/null +++ b/python/PyECC/ecc/shacrypt.py @@ -0,0 +1,38 @@ +# ------------------------------------------------------------------------------ +# +# SHA-512-BASED FEISTEL CIPHER +# by Toni Mattis +# +# Feistel Function: SHA-512(Block || Key) +# Key Size: Fully Dynamic +# Block Size: 1024 Bits +# Rounds: User-Specified +# +# ------------------------------------------------------------------------------ + +from hashlib import sha512 + +BPOS = tuple(range(64)) + +def enc_block(block, key, rounds = 16): + x = block[:64] + y = block[64:] + for i in xrange(rounds): + h = sha512(x + key).digest() + y = ''.join([chr(ord(y[k]) ^ ord(h[k])) for k in BPOS]) + h = sha512(y + key).digest() + x = ''.join([chr(ord(x[k]) ^ ord(h[k])) for k in BPOS]) + return x + y + +def dec_block(block, key, rounds = 16): + x = block[:64] + y = block[64:] + for i in xrange(rounds): + h = sha512(y + key).digest() + x = ''.join([chr(ord(x[k]) ^ ord(h[k])) for k in BPOS]) + h = sha512(x + key).digest() + y = ''.join([chr(ord(y[k]) ^ ord(h[k])) for k in BPOS]) + return x + y + + + -- cgit v1.2.3