oracle db内部的package全部是加密的,需要解密使用oracle wrap加密过的程序包,而unwrap解密工具可以拿到明文的package源代码。
解密的理论依据都来源于 "The oracle hacker's handbook" by David Litchfield 这本书,书中介绍了wrap的过程
Unwrap by changing deltas between values to 2*pi complement. Unwrap radian phase phase by changing absolute jumps greater than discont to their 2*pi complement along the given axis.