Beijing has reportedly expressed concern at the claims, which are based on documents from US whistleblower Edward Snowden obtained by Auckland's Herald on Sunday newspaper.
The newspaper reported that New Zealand intelligence and the US National Security Agency collaborated on a plan to hack a data link between China's consulate in Auckland and a nearby visa office run by the Chinese.
It said it was unclear whether the hack went ahead because Snowden fled the NSA in May 2013, before it had come to fruition.
"We will firmly safeguard our security interests and continue to guarantee our cyber and information security with concrete measures," it said.
"At present, cyber space is riddled with chaos and uncertainty. China proposes to settle disputes through dialogue and formulate codes to regulate cyber space behaviours that are acceptable to all sides."
Key refused to comment on the report, saying only that the documents it was based upon had been stolen.
"I'm not going to talk about any foreign intelligence that we gather from any country or any particular reason, all I can tell you is that we gather information when it's in the best interests of New Zealand," he told TV3.
"You're asking a hypothetical question and I'm not going to do that because I can't give you an answer, I don't know," he said.
"What I can tell you is we've got an immensely strong relationship with China, it's very open and we talk to them about all sorts of things,
"If they want to raise any issue with us they're welcome to, but I'd be surprised if they do."
New Zealand is part of the "Five Eyes" intelligence network which also includes the United States, Britain, Australia and Canada.
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