- TF-M - lists.trustedfirmware.org

Multi-threaded single-scheduler model proposal

by Shreve, Erik

I'd like to propose an additional model that provides a single-scheduler _and_ multiple thread support for PSA RoT. To state a little more specifically: * The NSPE scheduler makes all scheduling decisions for execution (call) flows of the NSPE tasks - including when those flows are operating in secure side * APIs are provided to the NSPE scheduler to switch SPE task contexts (one task context associated to each NSPE task that uses PSA RoT) * Resource locking APIs are provided to allow PSA RoT functions to communicate with the NSPE scheduler (i.e. mutex take/give) * A SPE scheduler may still exist for application root of trust services, if any exist on a system. I don't see anything written up on a model like this in the design proposals or Phabricator. However, it appears to me that such a model (or something similar) must have been previously discussed. 1. There already exists a tz_context API set in CMSIS-Core for communicating task switches by the NSPE scheduler to the SPM 2. Cooperative scheduling rules design was accepted: https://ci.trustedfirmware.org/job/tf-m-build-test-nightly/lastSuccessfulBu… 3. https://youtu.be/6wEFoq49qUw?t=1671 speaks about having a stack on the SPE per NSPE task. Also, the question from the audience at the end of the presentation relates to having a single NSPE scheduler. A brief word on the motivation for such a proposal... To ease (and thus increase) adaptation of PSA RoT, wherein those services are protected from nontrusted code, the impact to the NSPE code should be minimized. The current models (Library, IPC) do well to minimize the impact from an API standpoint. That is, the NSPE caller need not know where/how the PSA RoT operates in order to compile. However, the current models do not minimize impact to scheduling on single core systems. The library model locks behind a single mutex the operations that previously existed independent of one another. The IPC model provides more flexibility. However, it still extends lock times beyond current implementations and it introduces an additional scheduler which removes determinism and forces system designers to rethink existing code. I'd like to know if there are any recorded plans for such a model (or something more similar to it than the three items above). If not, has it been discussed and actively rejected? If so why? I can/will write up a more concrete proposal, but wanted to get some discussion around the high-level idea first. Thanks, Erik Shreve, PSEM Software Security Engineer & Architect (CMCU Platform Development) Texas Instruments Inc. 12500 TI Boulevard, MS F4000 Dallas, TX 75243

4 years, 9 months

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Trusted Firmware Keynote @Linaro TechDays (Wed 25 Mar, 16:00-16:30 GMT)

by Shebu Varghese Kuriakose

Hi All, Trusted Firmware will be opening the Linaro Tech Days event on Wed 25th March at 4pm (16:00) GMT with a keynote presenting all the latest exciting news from the project. https://connect.linaro.org/resources/ltd20/ltd20-200k/ and, once registered, on sched: https://linarotechdays.sched.com/event/ZZFK/ltd20-200k-keynote-trusted-firm… The session will be live streamed and recorded (links in the above resources) and slides will be attached there too. Don't miss it! Regards, Shebu/Matteo

4 years, 9 months

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Re: [TF-M] psa-arch-tests console baud rate

by Edison Ai

Hi Thomas, For your 2nd question. I have tested it on my side and it has the same problem. The TF-M can print normal boot message, but the log becomes garbage after enter into Arch test. The PSA Arch test is another independent project, and I have arisen this issue to the PSA Arch test project: https://github.com/ARM-software/psa-arch-tests/issues/164. You can watch this issue directly. Thanks, Edison From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Edison Ai via TF-M Sent: Thursday, March 19, 2020 9:54 PM To: 'tf-m(a)lists.trustedfirmware.org' <tf-m(a)lists.trustedfirmware.org> Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] psa-arch-tests console baud rate Hi Thomas, Thanks your mail. For your 1st question. There is indeed a problem to build the PSA arch crypto test on the Musca_a board for the RAM size is too small. I suggest you split the crypto tests into different test images on the Musca_a board. For the 2nd question, I only test that on FVP AN521 but never met this problem. We will test that on the MPS2 AN521 board soon to check if it is a real problem. If yes, we will try to fix that quickly. Thanks, Edison From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Thomas Törnblom via TF-M Sent: Wednesday, March 18, 2020 9:38 PM To: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Subject: [TF-M] psa-arch-tests console baud rate Triggered by Rays mail on slow RSA key pair generation, I built and tried to run the tests, but ran into a couple of issues: 1) I attempted to build it for the Musca A, but apparently that doesn't have enough RAM to run these tests 2) Switching to an MPS2+ with AN521 configuration I see that the baud rate on the UART appears wrong when running the tests. mcuboot produces correct messages at 115200 bps, as does the normal ConfigRegression* tests, but the ConfigPsaApiTest* appears to produce just garbage. Is there a setting I need to set to get any useful data on the terminal when running the ConfigPsaApiTests? Cheers, Thomas -- Thomas Tï¿½rnblom, Product Engineer IAR Systems AB Box 23051, Strandbodgatan 1 SE-750 23 Uppsala, SWEDEN Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 E-mail: thomas.tornblom(a)iar.com<mailto:thomas.tornblom@iar.com> Website: www.iar.com<http://www.iar.com> Twitter: www.twitter.com/iarsystems<http://www.twitter.com/iarsystems>

4 years, 9 months

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Re: [TF-M] [EXTERNAL] Re: SPM_IDLE

by DeMars, Alan

Ken, Our secure callback solution to this issue is working. I am just following up to understand what the SPM_IDLE concept is. Alan On Mar 20, 2020, at 4:34 AM, Ken Liu via TF-M <tf-m(a)lists.trustedfirmware.org> wrote: Hi Alan, Looks like this is the still classic case, but unfortunately that there is no defined design at the current stage. Heard you were working on an solution for this, and got some issues when non-secure preempts secure execution, since your scheduler works in thread mode so cannot update secure context while scheduling – please correct me if my understanding is wrong. Is this mail a follow up or another thread just focus on discussion of the cooperative scheduling document? BR /Ken From: DeMars, Alan <ademars(a)ti.com> Sent: Friday, March 20, 2020 2:27 AM To: Ken Liu <Ken.Liu(a)arm.com> Cc: 'tf-m(a)lists.trustedfirmware.org' <tf-m(a)lists.trustedfirmware.org> Subject: RE: SPM_IDLE Ken, Our use case is to support a “secure driver”: 1. A peripheral can only be accessed in secure mode. 2. The peripheral is configured and a hardware process is triggered within the peripheral. 3. When the process completes, a secure interrupt is triggered. 4. The NS thread that is using this driver should block (allowing other NS threads to run) while waiting for the hardware process to complete and resume when the process is finished. Alan From: TF-M [mailto:tf-m-bounces@lists.trustedfirmware.org] On Behalf Of Ken Liu via TF-M Sent: Thursday, March 5, 2020 10:28 PM To: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Cc: nd Subject: [EXTERNAL] Re: [TF-M] SPM_IDLE Hi Alan, It (8.3.5) is one of the cases can be dealt with, and now it is not detail defined yet. Can you describe what your practical purpose for S/NS interactive is so that we could collect feedbacks to check if the rules are applicable? /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of DeMars, Alan via TF-M Sent: Wednesday, March 4, 2020 10:51 PM To: 'tf-m(a)lists.trustedfirmware.org' <tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>> Subject: [TF-M] SPM_IDLE Mention is made to “SPM_IDLE” in the Cooperative Scheduling Rules document: https://ci.trustedfirmware.org/job/tf-m-build-test-nightly/lastSuccessfulBu… I’m struggling to understand section 8.3.5 which references SPM_IDLE but doesn’t really define it. Is there more info on this topic? It appears to be a proposed solution for allowing other NS threads to be scheduled while the current NS thread is waiting for an asynchronous event in the secure service it has called. Alan -- TF-M mailing list TF-M(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-m

4 years, 9 months

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Interface: Remove unused header include

by Devaraj Ranganna

Hi, The patchset https://review.trustedfirmware.org/c/trusted-firmware-m/+/3620 removes the header `tfm_veneers.h` from PSA IPC API source files. If there are no objects then can this patchset be merged? Thanks, Dev IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 9 months

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Re: [TF-M] SPM_IDLE

by DeMars, Alan

Ken, Our use case is to support a "secure driver": 1) A peripheral can only be accessed in secure mode. 2) The peripheral is configured and a hardware process is triggered within the peripheral. 3) When the process completes, a secure interrupt is triggered. 4) The NS thread that is using this driver should block (allowing other NS threads to run) while waiting for the hardware process to complete and resume when the process is finished. Alan From: TF-M [mailto:tf-m-bounces@lists.trustedfirmware.org] On Behalf Of Ken Liu via TF-M Sent: Thursday, March 5, 2020 10:28 PM To: tf-m(a)lists.trustedfirmware.org Cc: nd Subject: [EXTERNAL] Re: [TF-M] SPM_IDLE Hi Alan, It (8.3.5) is one of the cases can be dealt with, and now it is not detail defined yet. Can you describe what your practical purpose for S/NS interactive is so that we could collect feedbacks to check if the rules are applicable? /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of DeMars, Alan via TF-M Sent: Wednesday, March 4, 2020 10:51 PM To: 'tf-m(a)lists.trustedfirmware.org' <tf-m(a)lists.trustedfirmware.org> Subject: [TF-M] SPM_IDLE Mention is made to "SPM_IDLE" in the Cooperative Scheduling Rules document: https://ci.trustedfirmware.org/job/tf-m-build-test-nightly/lastSuccessfulBu… I'm struggling to understand section 8.3.5 which references SPM_IDLE but doesn't really define it. Is there more info on this topic? It appears to be a proposed solution for allowing other NS threads to be scheduled while the current NS thread is waiting for an asynchronous event in the secure service it has called. Alan

4 years, 9 months

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Re: [TF-M] 2048-bit RSA Keypair generation is slow

by Raymond Ngun

Thanks Tamas, Did you try with CC312 disabled as well? I am wondering if you would be able to at least reproduce what I saw. Ray From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Tamas Ban via TF-M Sent: Thursday, March 19, 2020 4:30 AM To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: [TF-M] FW: 2048-bit RSA Keypair generation is slow CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Hi, We did measurements on Musca-B1 with enabled CC312. We did 10 run with both compiler( armclang and gnuarm). RSA2048 key generation takes 10-35 sec. In average gnuarm seems a bit slower. I suspect the reason behind that random number still need to be tested that are they fit for rsa2048 generation (might are they primes?) and the testing algorithm is might faster with armclang. But for sure we have not seen any run which could take minutes. Tamas From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Adrian Shaw via TF-M Sent: 19 March 2020 12:17 To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>>; Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>>; tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Subject: Re: [TF-M] 2048-bit RSA Keypair generation is slow If the platform has on-chip NVM then you should consider using NV seed entropy. You still need a TRNG to get the initial entropy, but seems like it could improve average runtime performance. I believe there's a macro like MBEDTLS_ENTROPY_NV_SEED that you have to enable, as well as providing the hooks to read/write the flash. Adrian ________________________________ From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> on behalf of Soby Mathew via TF-M <tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>> Sent: 18 March 2020 16:24 To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>>; tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> <tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>> Subject: Re: [TF-M] 2048-bit RSA Keypair generation is slow Hi Ray, That is good information. The software RNG is not truly random and is not production quality. The predictable timing could be an indicator that the randomness is reproducible. That's all I know, but the mbed-crypto team may have more inputs and they can be queried here : https://github.com/ARMmbed/mbed-crypto/issues Best Regards Soby Mathew From: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Sent: 18 March 2020 15:33 To: Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Cc: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>; nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: 2048-bit RSA Keypair generation is slow Hi Soby, Musca-B1 has CC312 support which will introduce an rng for this purpose. Unfortunately, I didn't test Musca-B1 with cc312 enabled and I don't have a board now to test with. However, I did test with a h/w rng on the PSoC64 and the performance isn't always better. When using s/w, the time it takes was quite consistent at 1.5 minutes or 5.5 minutes depending on toolchain. After introducing the h/w rng, I've seen it finish quickly (less than a minute) but I've also seen it take 15 minutes. Thanks, Ray From: Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Sent: Wednesday, March 18, 2020 4:44 AM To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Cc: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>; nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: 2048-bit RSA Keypair generation is slow Hi Raymond Thanks for bring this to the forum. When I did the migration to the latest mbed-crypto tag, I faced the same issue. After couple of discussion within the team and mbedcrypto, this is the understanding I have. Currently mbedcrypto is configured to use NULL entropy. Hence this is the print message when building mbedcrypto : #warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! " This means that mbedcrypto uses a software algorithm to generate randomness. It iterates this algorithm till it can generate enough randomness for the keypair generation and this is the reason for the delay. If the hardware has an entropy source which can be used for this random number generation, then I understand the performance will be much better. But this will need suitable configuration to be enabled from TF-M. I am not much familiar with hardware architecture of M-Class systems. One of the questions I have to the forum is, do we have such entropy sources on the hardware? Then it is worth scheduling some task to investigate how to abstract/use the entropy source. Best Regards Soby Mathew From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Raymond Ngun via TF-M Sent: 17 March 2020 21:02 To: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Subject: [TF-M] 2048-bit RSA Keypair generation is slow Hi all, When testing the PSA API Crypto Dev API test suite, I noticed that psa_generate_key() is awfully slow when generating a 2048-bit RSA keypair and the performance is different depending on toolchain used. I've run these tests on Musca-B1 and with GCC, key generation generally completes in 25s but an armclang build requires 2.5 minutes to complete. This is more pronounced on PSoC64 where we are building for armv6m. Here, the key generation can take up to 5.5 minutes and I've seen it take even longer - I assume this is due to values returned by rng. Anybody have comments on the performance of psa_generate_key() or more specifically mbedtls_rsa_gen_key()? What can be done to help improve the performance of this software implementation? Thank you, Ray This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message. This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message.

4 years, 9 months

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Re: [TF-M] psa-arch-tests console baud rate

by Edison Ai

Hi Thomas, Thanks your mail. For your 1st question. There is indeed a problem to build the PSA arch crypto test on the Musca_a board for the RAM size is too small. I suggest you split the crypto tests into different test images on the Musca_a board. For the 2nd question, I only test that on FVP AN521 but never met this problem. We will test that on the MPS2 AN521 board soon to check if it is a real problem. If yes, we will try to fix that quickly. Thanks, Edison From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Thomas Törnblom via TF-M Sent: Wednesday, March 18, 2020 9:38 PM To: tf-m(a)lists.trustedfirmware.org Subject: [TF-M] psa-arch-tests console baud rate Triggered by Rays mail on slow RSA key pair generation, I built and tried to run the tests, but ran into a couple of issues: 1) I attempted to build it for the Musca A, but apparently that doesn't have enough RAM to run these tests 2) Switching to an MPS2+ with AN521 configuration I see that the baud rate on the UART appears wrong when running the tests. mcuboot produces correct messages at 115200 bps, as does the normal ConfigRegression* tests, but the ConfigPsaApiTest* appears to produce just garbage. Is there a setting I need to set to get any useful data on the terminal when running the ConfigPsaApiTests? Cheers, Thomas -- Thomas Tï¿½rnblom, Product Engineer IAR Systems AB Box 23051, Strandbodgatan 1 SE-750 23 Uppsala, SWEDEN Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 E-mail: thomas.tornblom(a)iar.com<mailto:thomas.tornblom@iar.com> Website: www.iar.com<http://www.iar.com> Twitter: www.twitter.com/iarsystems<http://www.twitter.com/iarsystems>

4 years, 9 months

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Re: [TF-M] 2048-bit RSA Keypair generation is slow

by Adrian Shaw

Note that you'll still to re-seed from the TRNG periodically, but doesn't have to be done every time the application needs a random number. Adrian ________________________________ From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> on behalf of Adrian Shaw via TF-M <tf-m(a)lists.trustedfirmware.org> Sent: 19 March 2020 11:16 To: Raymond Ngun <Raymond.Ngun(a)cypress.com>; Soby Mathew <Soby.Mathew(a)arm.com> Cc: nd <nd(a)arm.com>; tf-m(a)lists.trustedfirmware.org <tf-m(a)lists.trustedfirmware.org> Subject: Re: [TF-M] 2048-bit RSA Keypair generation is slow If the platform has on-chip NVM then you should consider using NV seed entropy. You still need a TRNG to get the initial entropy, but seems like it could improve average runtime performance. I believe there's a macro like MBEDTLS_ENTROPY_NV_SEED that you have to enable, as well as providing the hooks to read/write the flash. Adrian ________________________________ From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> on behalf of Soby Mathew via TF-M <tf-m(a)lists.trustedfirmware.org> Sent: 18 March 2020 16:24 To: Raymond Ngun <Raymond.Ngun(a)cypress.com> Cc: nd <nd(a)arm.com>; tf-m(a)lists.trustedfirmware.org <tf-m(a)lists.trustedfirmware.org> Subject: Re: [TF-M] 2048-bit RSA Keypair generation is slow Hi Ray, That is good information. The software RNG is not truly random and is not production quality. The predictable timing could be an indicator that the randomness is reproducible. That’s all I know, but the mbed-crypto team may have more inputs and they can be queried here : https://github.com/ARMmbed/mbed-crypto/issues Best Regards Soby Mathew From: Raymond Ngun <Raymond.Ngun(a)cypress.com> Sent: 18 March 2020 15:33 To: Soby Mathew <Soby.Mathew(a)arm.com> Cc: tf-m(a)lists.trustedfirmware.org; nd <nd(a)arm.com> Subject: RE: 2048-bit RSA Keypair generation is slow Hi Soby, Musca-B1 has CC312 support which will introduce an rng for this purpose. Unfortunately, I didn’t test Musca-B1 with cc312 enabled and I don’t have a board now to test with. However, I did test with a h/w rng on the PSoC64 and the performance isn’t always better. When using s/w, the time it takes was quite consistent at 1.5 minutes or 5.5 minutes depending on toolchain. After introducing the h/w rng, I’ve seen it finish quickly (less than a minute) but I’ve also seen it take 15 minutes. Thanks, Ray From: Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Sent: Wednesday, March 18, 2020 4:44 AM To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Cc: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>; nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: 2048-bit RSA Keypair generation is slow Hi Raymond Thanks for bring this to the forum. When I did the migration to the latest mbed-crypto tag, I faced the same issue. After couple of discussion within the team and mbedcrypto, this is the understanding I have. Currently mbedcrypto is configured to use NULL entropy. Hence this is the print message when building mbedcrypto : #warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! " This means that mbedcrypto uses a software algorithm to generate randomness. It iterates this algorithm till it can generate enough randomness for the keypair generation and this is the reason for the delay. If the hardware has an entropy source which can be used for this random number generation, then I understand the performance will be much better. But this will need suitable configuration to be enabled from TF-M. I am not much familiar with hardware architecture of M-Class systems. One of the questions I have to the forum is, do we have such entropy sources on the hardware? Then it is worth scheduling some task to investigate how to abstract/use the entropy source. Best Regards Soby Mathew From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Raymond Ngun via TF-M Sent: 17 March 2020 21:02 To: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Subject: [TF-M] 2048-bit RSA Keypair generation is slow Hi all, When testing the PSA API Crypto Dev API test suite, I noticed that psa_generate_key() is awfully slow when generating a 2048-bit RSA keypair and the performance is different depending on toolchain used. I’ve run these tests on Musca-B1 and with GCC, key generation generally completes in 25s but an armclang build requires 2.5 minutes to complete. This is more pronounced on PSoC64 where we are building for armv6m. Here, the key generation can take up to 5.5 minutes and I’ve seen it take even longer – I assume this is due to values returned by rng. Anybody have comments on the performance of psa_generate_key() or more specifically mbedtls_rsa_gen_key()? What can be done to help improve the performance of this software implementation? Thank you, Ray This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message. This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 9 months

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FW: 2048-bit RSA Keypair generation is slow

by Tamas Ban

Hi, We did measurements on Musca-B1 with enabled CC312. We did 10 run with both compiler( armclang and gnuarm). RSA2048 key generation takes 10-35 sec. In average gnuarm seems a bit slower. I suspect the reason behind that random number still need to be tested that are they fit for rsa2048 generation (might are they primes?) and the testing algorithm is might faster with armclang. But for sure we have not seen any run which could take minutes. Tamas From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Adrian Shaw via TF-M Sent: 19 March 2020 12:17 To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>>; Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>>; tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Subject: Re: [TF-M] 2048-bit RSA Keypair generation is slow If the platform has on-chip NVM then you should consider using NV seed entropy. You still need a TRNG to get the initial entropy, but seems like it could improve average runtime performance. I believe there's a macro like MBEDTLS_ENTROPY_NV_SEED that you have to enable, as well as providing the hooks to read/write the flash. Adrian ________________________________ From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> on behalf of Soby Mathew via TF-M <tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>> Sent: 18 March 2020 16:24 To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>>; tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> <tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>> Subject: Re: [TF-M] 2048-bit RSA Keypair generation is slow Hi Ray, That is good information. The software RNG is not truly random and is not production quality. The predictable timing could be an indicator that the randomness is reproducible. That's all I know, but the mbed-crypto team may have more inputs and they can be queried here : https://github.com/ARMmbed/mbed-crypto/issues Best Regards Soby Mathew From: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Sent: 18 March 2020 15:33 To: Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Cc: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>; nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: 2048-bit RSA Keypair generation is slow Hi Soby, Musca-B1 has CC312 support which will introduce an rng for this purpose. Unfortunately, I didn't test Musca-B1 with cc312 enabled and I don't have a board now to test with. However, I did test with a h/w rng on the PSoC64 and the performance isn't always better. When using s/w, the time it takes was quite consistent at 1.5 minutes or 5.5 minutes depending on toolchain. After introducing the h/w rng, I've seen it finish quickly (less than a minute) but I've also seen it take 15 minutes. Thanks, Ray From: Soby Mathew <Soby.Mathew(a)arm.com<mailto:Soby.Mathew@arm.com>> Sent: Wednesday, March 18, 2020 4:44 AM To: Raymond Ngun <Raymond.Ngun(a)cypress.com<mailto:Raymond.Ngun@cypress.com>> Cc: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org>; nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: 2048-bit RSA Keypair generation is slow Hi Raymond Thanks for bring this to the forum. When I did the migration to the latest mbed-crypto tag, I faced the same issue. After couple of discussion within the team and mbedcrypto, this is the understanding I have. Currently mbedcrypto is configured to use NULL entropy. Hence this is the print message when building mbedcrypto : #warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! " This means that mbedcrypto uses a software algorithm to generate randomness. It iterates this algorithm till it can generate enough randomness for the keypair generation and this is the reason for the delay. If the hardware has an entropy source which can be used for this random number generation, then I understand the performance will be much better. But this will need suitable configuration to be enabled from TF-M. I am not much familiar with hardware architecture of M-Class systems. One of the questions I have to the forum is, do we have such entropy sources on the hardware? Then it is worth scheduling some task to investigate how to abstract/use the entropy source. Best Regards Soby Mathew From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Raymond Ngun via TF-M Sent: 17 March 2020 21:02 To: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Subject: [TF-M] 2048-bit RSA Keypair generation is slow Hi all, When testing the PSA API Crypto Dev API test suite, I noticed that psa_generate_key() is awfully slow when generating a 2048-bit RSA keypair and the performance is different depending on toolchain used. I've run these tests on Musca-B1 and with GCC, key generation generally completes in 25s but an armclang build requires 2.5 minutes to complete. This is more pronounced on PSoC64 where we are building for armv6m. Here, the key generation can take up to 5.5 minutes and I've seen it take even longer - I assume this is due to values returned by rng. Anybody have comments on the performance of psa_generate_key() or more specifically mbedtls_rsa_gen_key()? What can be done to help improve the performance of this software implementation? Thank you, Ray This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message. This message and any attachments may contain confidential information from Cypress or its subsidiaries. If it has been received in error, please advise the sender and immediately delete this message. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

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