use simple lcg in xor

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DepFA 2022-10-11 04:17:36 +01:00 committed by GitHub
parent e0fbe6d27e
commit 7aa8fcac1e
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@ -39,9 +39,15 @@ def embeddingFromB64(data):
d = base64.b64decode(data)
return json.loads(d,cls=EmbeddingDecoder)
def lcg(m=2**32, a=1664525, c=1013904223, seed=0):
while True:
seed = (a * seed + c) % m
yield seed
def xorBlock(block):
return np.bitwise_xor(block.astype(np.uint8),
((np.random.RandomState(0xDEADBEEF).random(block.shape)*255).astype(np.uint8)) & 0x0F )
g = lcg()
randblock = np.array([next(g) for _ in range(np.product(block.shape))]).astype(np.uint8).reshape(block.shape)
return np.bitwise_xor(block.astype(np.uint8),randblock & 0x0F)
def styleBlock(block,sequence):
im = Image.new('RGB',(block.shape[1],block.shape[0]))