Algoritm to Reverse a Cripto at Password Field

Hello Guys!

I want to know if is possible to reverse a cripto field to make external app access same database?

Scenario is an ERP that store user passwors in a char(10) field, but, encripted

I have external apps that complements this ERP, but I need to read User and Password for my apps too.

So I have the encripted values, and these passwords that corresponding.

I would like to know if there a way to do a reverse engineering.

For example:

If userpassword is "test123" correspond to "wBýÛO¶"