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How to make X-CUBE-CRYPTOLIB V3.1.0 to perform AES-192 encryption compatible with other online tools?

molecule.192
Associate

‎2020-01-12 05:28 PM

I am using X-CUBE-CRYPTOLIB V3.1.0 on STM32L0 to perform AES-192 encryption with a 192-bits key and 128-bits IV. Encrypted Data by STM32L0 can be correctly decrypted by STM32L0 using the same library.

However, when I copy the encrypted data, key and IV to some common online tools for decryption on PC, none of them can get the correct data.

The only way I can get the correct decrypted data from PC is to use OpenSSL with "-nopad" option enable. It looks the problem is related to block padding in encryption. May I know how to configure the AES-192 encryption in  X-CUBE-CRYPTOLIB V3.1.0 so that other online tool is able to decrypt?

Thank you for your kind attention.

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molecule.192
Associate

‎2020-01-15 01:31 AM

The X-CUBE-CRYPTOLIB V3.1.0 library does not append any padding during AES encoding. After padding the input using PKCS#7 such that input length is a multiple of AES block size, this problem is solved.

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