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def encrypt_repeating_key(x, key):
result = b""
for i in range(len(x)):
b = ord(x[i]) ^ ord(key[i % len(key)])
result += b.to_bytes(1, 'big')
return result.hex()
cleartext = "Burning 'em, if you ain't quick and nimble\nI go crazy when I hear a cymbal"
expected = "0b3637272a2b2e63622c2e69692a23693a2a3c6324202d623d63343c2a26226324272765272a282b2f20430a652e2c652a3124333a653e2b2027630c692b20283165286326302e27282f"
run_tests = False
if run_tests:
ciphertext = encrypt_repeating_key(cleartext, "ICE")
print(ciphertext)
assert ciphertext == expected
print("Success!")
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