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| Decrypted header's CTR. Also used to calculate the size of the entire package2 with the raw header: size = word2 ^ word3 ^ word0.

| Header's CTR. Official code copies the pre-decryption CTR over the decrypted result. Used to calculate the size of the entire package2 with the raw header: size = word2 ^ word3 ^ word0, additionally validated by checking (word1 ^ (word1 >> 16)) & 0xFF == word1 >> 24.

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