Centuries of Christian ethical reflection would lead to the answer "no." Inflicting bodily or psychological harm on a helpless captive would be inconsistent with the Christian understanding of human dignity. But as with all moral obligations, there may be circumstances for exception.
It is well understood in Christian tradition that while we are supposed to obey the law, there may be times when there is a higher obligation (see Aquinas, Augustine, and Martin Luther King). To rescue a drowning person, a Christian would be justified in disobeying a "no trespassing" sign.
So it is with torture; if a competent authority honestly believed that this was the only way to get information that might save the lives of thousands, I believe he would be justified. That is not moral relativism. It is making a difficult decision when human life and dignity will be affected either way. The Greeks called it prudence.
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