RE: Hardware ECB decryption(AES)

Martin Lesund — Mon, 05 Feb 2018 15:20:20 GMT

Hi Challen,

The example you are referring to is only using encryption, but you can use the same API for the decryption. The first parameter to CRYS_AESCCM chooses if it's gonna be encryption or decryption. (SASI_AES_ENCRYPT can be changed to SASI_AES_DECRYPT, both from the enum SaSiAesEncryptMode_t)

You would presumably find what you need if you look in the API-Documentation to CC_AESCCM found in [<SDK_Version>\external\nrf_cc310\include\crys_aesccm.h]

(Note: CRYS_AESCCM which is used in the example is defined to CC_AESCCM in crys_aesccm.h)

Best Regards,

Martin L.

RE: Hardware ECB decryption(AES)

Jakub Rzeszutko — Mon, 05 Feb 2018 11:01:54 GMT

Hi,

Decryption is similar to encryption. The only difference is in the init function SaSi_AesInit. You need to change its second argument to: SASI_AES_DECRYPT. Other steps are the same as for encryption