def decrypt_256_ecb(data, key, padding=True):
key = fixed_length_key(key, 32)
r = ""
for i in range(0, len(data), 16):
r += aes256dec(data[i:i + 16], key)
if padding:
return pkcs7.remove_padding(r)
else:
return r
def decrypt_raw(data, key, iv="\0" * 32):
"Decrypt data"
key = fixed_length_key(key, 32)
plaintext = ""
for i in range(0, len(data), 32):
block = data[i:i + 32]
iv = hash(xor_str(iv, key))
plaintext += xor_str(iv, block)
plaintext = remove_padding(plaintext)
return plaintext
def decrypt_256_cbc(data, key, padding=True, gen_iv=True):
key = fixed_length_key(key, 32)
r = ""
if gen_iv:
iv = data[:16]
data = data[16:]
else:
iv = "\0" * 16
for i in range(0, len(data), 16):
cipherblock = data[i:i + 16]
r += xor_str(aes256dec(cipherblock, key), iv)
iv = cipherblock
if padding:
return pkcs7.remove_padding(r)
else:
return r