Cheat Engine

[HSergi]

I have an array of structs with encrypted primitives: integer and floating number types.

I have found encryption and decryption functions, their signatures are as following:
using encryptionFunction = __int32(__fastcall*)(__int32 numberToEncrypt)
using decryptionFunction = __int32(__fastcall*)(__int32 numberToDecrypt)

Got byte code and reversed pseudo-C-like code from IDA.

I was thinking to make a simple console application to encrypt and decrypt values but that's not quite it, all the values in Cheat Engine are still encrypted. Would be awesome if I could make Cheat Engine encrypt and decrypt values.

How to make Cheat Engine show decrypted values in structure dissect window?

[Csimbi]

CE can't do such conversions on the fly.
What you could try is force a null-encryption, so no values would ever be encrypted.

[Dark Byte]

create a custom type that does the decryption and set the elements in the structure to that custom type

How that custom type is implemented is up to how you implement the decoder. Can be in pure asm, lua(e.g using executeCodeEx or the executor thread. Tip: Use caching), or using a dll you inject into CE