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Can bootloader support RSA 3072 for nrf5340?

Jaewook

Dear,

We are llooking for an example to use RSA 3072 for nrf5340 bootloader.

How can bootloader (samples/bootloader example) support RSA 3072 for nrf5340?

Regards,

Jae

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    Hi,

    The ARM Cryptocell CC312 in nRF5340 supports RSA up to key lengths of 3072, but the cc3xx backend in nrf_security is limited to a key size of 2048 (likely since CC310 in nRF9160/nRF52840 only supports key size of 2048).

    If you want to use RAS 3072 in nRF5340, you can use the Mbed backend, which has no limitation in key size. This backend does not use HW acceleration through the Cryptocell peripheral.

    Best regards,
    Jørgen 

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  • 0

    Hi,

    The ARM Cryptocell CC312 in nRF5340 supports RSA up to key lengths of 3072, but the cc3xx backend in nrf_security is limited to a key size of 2048 (likely since CC310 in nRF9160/nRF52840 only supports key size of 2048).

    If you want to use RAS 3072 in nRF5340, you can use the Mbed backend, which has no limitation in key size. This backend does not use HW acceleration through the Cryptocell peripheral.

    Best regards,
    Jørgen 

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