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Fix encryption with blocksize 4 #6

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Fix encryption with blocksize 4 #6

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8 changes: 4 additions & 4 deletions hpc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -336,9 +336,9 @@ def tiny_1_6_encrypt(s0, kx, spice, blocksize, cycle_num):
elif blocksize <= 3:
for word in tmp:
for i in range(math.ceil(32/blocksize)):
s0 = mask_lower(s0 ^ (word & ((1 << blocksize)-1)), blocksize)
word >>= blocksize
s0 = mask_lower(s0 + (word & ((1 << blocksize)-1)), blocksize)
word >>= blocksize
s0 = mask_lower(s0 ^ (word & ((1 << blocksize)-1)), blocksize)
s0 = m_lrot(s0, 1, blocksize)
word >>= blocksize
else:
Expand Down Expand Up @@ -404,9 +404,9 @@ def tiny_1_6_decrypt(s0, kx, spice, blocksize, cycle_num):
for i in reversed(range(math.ceil(32/blocksize))):
t_word = (word & (m_val << (i * blocksize * 2))) >> (i * blocksize * 2)
s0 = _PERM2I_TINY(s0)
s0 -= (t_word >> blocksize)
s0 ^= (t_word >> blocksize)
s0 = _PERM1I_TINY(s0)
s0 ^= (t_word & ((1 << blocksize)-1))
s0 -= (t_word & ((1 << blocksize)-1))
else:
tmp.append(kx[18+2*blocksize])
if blocksize == 6:
Expand Down