using the STM32 Crypt processor I could successfully encrypt and decrypt plaintext using AES GCM (STM32 cryptographic library version V1.5.0). The stm contoller that I am using is STM32F479NIHx.
Simultaneously, there is another crypto project in the PC side using the polarssl library (Version polarssl-1.2.15) with the same AES GCM encrypt/decrypt parts. It also working fine.
However, the problem is that when using the same AES256 key, IV array (size 12), plaintext, header (AAD), the STM32F4 and the PC generates different ciphers and tags. Their lengths are the same across the platforms but the content is totally different.So it becomes impossible to encrypt in PC and try to decrypt the cipher in STM32F4.
