Implement cipherstate rekey. #61
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Implement cipherstate rekeying as described in the protocol spec section 4.2. Rekeying encrypts zeros with nonce=UINT64_MAX and uses the ciphertext as the new key, without modifying the state's original nonce.
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Implement cipherstate rekeying as described in the protocol spec section 4.2. Rekeying encrypts zeros with nonce=UINT64_MAX and uses the ciphertext as the new key, without modifying the state's original nonce.