A prison source said the other inmates disliked Smith and were annoyed at the attention he was getting.
"No one likes him. The feeling up there is that Phillip Smith is lying about the corruption by the prison officer ... it's a complete fantasy.
"They think he is trying to cover up for [someone else]. Why would you give up a prison guard?"
In 1995, Smith stabbed to death the father of a boy he had been sexually abusing, after tracking the family down to a Wellington house where they had moved to escape him.
The source said no prison officer in their right mind would help a child sex offender.
"They are bottom of the heap, the bottom of the criminal world, and it's very unlikely a prison officer would collude with him because of that low status and the high chance of being given up by him."
The Corrections Department's northern regional commissioner, Jeanette Burns, said Smith's allegations were "as yet unsubstantiated and incomplete". The matter had been referred to the police.
"The allegations may turn out to be serious but until they're properly investigated and tested in court they remain just that, allegations."