[nRF5 SDK15.3]52810 encryption problem

RE: [nRF5 SDK15.3]52810 encryption problem

Charlie — Thu, 03 Mar 2022 13:46:44 GMT

Hi Zero,

The following library demostrates how ECB peripheral is used.

AES ECB encryption

modules\nrfx\hal\nrf_ecb.c

modules\nrfx\hal\nrf_ecb.h

Search function name through nRF5 SDK and you will find how these functions are used by other components.

Best regards,

Charlie

RE: [nRF5 SDK15.3]52810 encryption problem

zero — Thu, 03 Mar 2022 03:42:19 GMT

Hi Charlie，

Looking at the specification of 52810, it supports ECB peripherals, so how to use ECB peripherals for encryption and decryption based on sdk14.2?

Best regards,

Zero

RE: [nRF5 SDK15.3]52810 encryption problem

Charlie — Wed, 02 Mar 2022 15:54:43 GMT

Hi Zero,

1)nRF5 SDK1.4.x does not have a formal production-level nrf_crypto library.

2)micro-ecc is for ECDH or ECDSA implementation, they are key exchange algorithms. It is not used for AES, which is a kind of bulk encryption algorithm.

If you just start your research on crypto usage, I suggest you learn some basic knowledge on security cipher suit first, then start with the latest Cryptography samples — nRF Connect SDK 1.9.0 documentation (nordicsemi.com). This will speed up your development and also make your life much easier. ;-)

Best regards,

Charlie

RE: [nRF5 SDK15.3]52810 encryption problem

zero — Wed, 02 Mar 2022 10:46:03 GMT

Hi Charlie，

Sorry, I made a mistake, I am currently using sdk14.2, I did not see a similar description of "Memory management in nrf_crypto" in sdk14.2. Based on sdk14.2, how much ram does it take to encrypt with micro-ecc backend?

Best regards,

Zero

RE: [nRF5 SDK15.3]52810 encryption problem

Charlie — Wed, 02 Mar 2022 09:51:12 GMT

No. the function nrf_cli_cmd_crypt_ecb in this example has basically demonstrated how to use ECB. Keep in mind that ECB is just one of several AES modes, so it is easy to adapt by following other samples like CBC, CTR modes.

Best regards,

Charlie

RE: [nRF5 SDK15.3]52810 encryption problem

zero — Wed, 02 Mar 2022 02:43:04 GMT

Hi Charlie，

Does ECB have a simple example to test evaluation? Seeing that only the \examples\crypto\nrf_crypto\aes\aes_all_cli example uses ECB, this code is hard to estimate how much ram it consumes.

Best regards,

Zero

RE: [nRF5 SDK15.3]52810 encryption problem

Charlie — Tue, 01 Mar 2022 12:36:42 GMT

Hi Zero,

Under Memory management in nrf_crypto table AES - Advanced Encryption Standard shows ECB memory cost is nrf_crypto_aes_context_t(292B)+nrf_crypto_aes_info_t(36B) under mbed TLS. If this is over your budget, you have to consider choosing chip with big memory size.

Best regards,

Charlie

RE: [nRF5 SDK15.3]52810 encryption problem

zero — Tue, 01 Mar 2022 11:15:38 GMT

[quote userid="93921" url="~/f/nordic-q-a/85283/nrf5-sdk15-3-52810-encryption-problem/355488#355488"]This will depend on which backend you are going to use. According to Cryptography library - nrf_crypto, at least two backends can be used for nRF52810: mbed TLS and micro-ecc.[/quote]

How much ram does it consume with mbed TLS?

[quote userid="93921" url="~/f/nordic-q-a/85283/nrf5-sdk15-3-52810-encryption-problem/355488#355488"]Memory management in nrf_crypto introduces how to assign proper configuration for memory buffer usage optimization.[/quote]

Seeing that the memory consumption of mbed TLS and micro-ecc is very high, how much is it? How much do you save after optimization?

RE: [nRF5 SDK15.3]52810 encryption problem

Charlie — Tue, 01 Mar 2022 10:17:52 GMT

Hi Zero,

[quote user=""]How much RAM does ECB encryption consume?[/quote]

This will depend on which backend you are going to use. According to Cryptography library - nrf_crypto, at least two backends can be used for nRF52810: mbed TLS and micro-ecc.

[quote user=""]Is there a way to encrypt that consumes less RAM?[/quote]

Memory management in nrf_crypto introduces how to assign proper configuration for memory buffer usage optimization.

Best regards,

Charlie