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Can the same mbedtls_ssl_context be used simultaneously for send and receive from different tasks?

by pascal.haefliger＠schweizer-electronic.com

Hello, In our project we use mbedTLS together with freeRTOS. mbedTLS requires an mbedtls_ssl_context (let's say `ssl_context`) for the send (`mbedtls_ssl_write(...)`) and receive (`mbedtls_ssl_read(...)`) functions. In our project we have a freeRTOS task `A` to send data with mbedTLS and a freeRTOS task `B`to receive data with mbedTLS over the same session/interface. Both tasks use the same `ssl_context` instance. Potentially sending and receiving can happen at the same time. Is it safe to use the same `ssl_context` instance from both taks? Or should only one task access the `ssl_context`? At the moment we are using `mbedtls_ssl_read(...)` in blocking mode and hence the `ssl_context` cannot be protected against multiple access with a mutex because then the sending task cannot obtain the mutex as long as the receiving task is the blocked receiving state (holding the mutext). Thank you for your help. Best regards, Pascal

3 years, 2 months

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Intent to remove DES in Mbed TLS 4.0

by Gilles Peskine

Hello, We intend to remove DES (including Triple-DES) in the next major version of Mbed TLS, i.e. Mbed TLS 4.0. We do not yet have a release date, but at the moment it seems likely that there will be a new major version in 2024. As usual, the Mbed TLS 3.x series will keep the current support for DES, and we intend to maintain the last 3.x minor release as a long-term support branch for 3 years. Rationale: Most security standards deprecate DES if they do not forbid it already. Tooling is widely available to switch to AES or other cipher. In particular, NIST will forbid Triple-DES except to decrypt legacy data after 31 December 2023 (following SP 800-131A <https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-131Ar2.pdf>). We would like to remove the last 64-bit block cipher from Mbed TLS to simplify some parts of the code and reduce the maintenance burden. If you wish for Mbed TLS to keep supporting DES longer, please let us know what your business case is, either by replying to this email or on the GitHub issue: https://github.com/Mbed-TLS/mbedtls/issues/7024 Best regards, -- Gilles Peskine Mbed TLS developer

3 years, 2 months

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Builtin keys and Opaque driver wrappers.

by Rehan Malak

Dear MbedTLS dev, I am writing an opaque driver (equivalent of PSA_CRYPTO_TEST_DRIVER_LOCATION/PSA_KEY_PERSISTENCE_READ_ONLY in the test suite) with the PSA API compiled with MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS. But I am not sure if I have to use "psa_import_key" before "psa_driver_wrapper_sign_message" or if I have to "read/generate" the builtin key on the fly, at each psa_driver_wrapper_* operation ? Would it be possible to add this example in the test suite ? Or explain how builtin key + opaque driver is supposed to be used with, for example, "psa_driver_wrapper_sign_message" ? I put more details below. Thank you in advance, Best regards, Rehan ############################################################################# I would like to write an example doing : I) psa_sign_message (ECDSA SECP256R1 SHA-256) II) psa_export_public_key III) psa_verify_message (with the public key from II) I am following the examples provided by the test suite, especially : 1) sign_message transparent driver: calculate in driver ECDSA SECP256R1 SHA-256 using the API : - psa_import_key - psa_sign_message with the attributes : - key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1) 2) PSA opaque driver builtin pubkey export: secp256r1 using the API : - psa_export_public_key with the attributes : - key_id = MBEDTLS_PSA_KEY_ID_BUILTIN_MIN + 1 - key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1) and the driver code : - platform_builtin_keys.c : mbedtls_psa_platform_get_builtin_key() (PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION) - test_driver_key_management.c : mbedtls_test_opaque_export_public_key() 3) verify_message transparent driver: calculate in driver ECDSA SECP256R1 SHA-256 using the API : - psa_import_key - psa_verify_message with the attributes : - key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1) It seems to me that II)=2) and 3) should be pretty similar to III) because I assume that neither transparent vs opaque, nor PSA_KEY_TYPE_ECC_KEY_PAIR vs PSA_KEY_TYPE_ECC_PUBLIC_KEY_BASE, is gonna change much here. But the signature I) is less clear... Has the built-in key feature been thought such that the read-only key is read each time we call a different PSA API function ? Long story short, an "opaque driver + builtin keys" equivalent of the "sign_message transparent driver: calculate in driver ECDSA SECP256R1 SHA-256" example in the test-suite would be really helpful :)

3 years, 2 months

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PSA crypto support for RH850 Microcontroller

by Tambe, Ujjwal (TCS)

Hello, Is it possible to use PSA crypto APIs for SHA256 and RSA signature verification for RH850F1KMS1 microcontroller from renesas which has G3KH cpu core. Let me know your thoughts. Thank you in advance. Regards, Ujjwal

3 years, 2 months

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Mbed TLS support for Renesas RH850 microcontroller

by Tambe, Ujjwal (TCS)

Hello, I am writing this mail in order to get support. I am using RH850-F1KMS1 microcontroller from Renesas, and I need to integrate mbed to perform SHA256 and RSA-1024 digital signature verification. The controller is bare metal and does not have any OS like freeRTOS. Just want to understand how to integrate mbed code in our project. Thank you in advance for the help. Regards, Ujjwal

3 years, 2 months

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Reminder: MBed TLS Technical Forum - US/Europe

by Don Harbin

Hi All, A gentle reminder that the US-Europe timezone-friendly MBed TLS Tech forum is next Monday at 4:30 PM UK time. Invite details can be found on the online calendar here <https://www.trustedfirmware.org/meetings/>. If you have any topics, please let Dave Rodgman know. :) Dave, Please keep in mind that next Monday is a Federal Holiday in the US, so this may impact attendance. Best regards, Don Harbin TrustedFirmware Community Manager don.harbin(a)linaro.org

3 years, 3 months

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[Mbed-tls-announce] Coding style change in Mbed TLS

by Gilles Peskine via Mbed-tls-announce

Hello, You are concerned if: you contribute to Mbed TLS, or you maintain local patches to Mbed TLS. You are not concerned if: you just use Mbed TLS. We are going to change the C coding style in Mbed TLS. The new style is mostly what you'd find in The C Programming Language, 2nd edition, by Brian Kernighan and Dennis Ritchie (K&R2). The main changes compared to the current style are: * Spaces outside parentheses, not inside. No space in f(x). * Opening braces on the same line as if(), for(), etc., but on a separate line for functions. Indentation remains 4 spaces. The recommended maximum line length remains 80 columns. There are a few deviations from K&R2, documentation will be available shortly. The new code style will be enforced by the CI testing. This means that style that's rejected by the tool will not be merged, full stop. This also means that sometimes we'll have code that looks a bit less good to humans because the tool insists on it. We're doing this to avoid wasting reviewers' and contributors' time with style violations in code review. The tool we're using is uncrustify<https://github.com/uncrustify/uncrustify>. You can see how your code will look like by installing uncrustify 0.75.1 and running scripts/code_style.py from mbedtls-3.3.0 or mbedtls-2.28.2. There are previews of the rewritten branches at https://github.com/Mbed-TLS/mbedtls/tree/features/new-code-style/development and https://github.com/Mbed-TLS/mbedtls/tree/features/new-code-style/mbedtls-2.… (updated every few days until the real branches are rewritten). If you're now starting work on a new feature or bugfix, it will probably be easier to start from those branches, and do an easy rebase once they become official. If you've been working on a branch, we will provide a script to rebase the branch and rewrite it to the new style commit by commit. You'll need to have uncrustify 0.75.1. Concretely, when we change the code style: * If you've started to work on a branch but review has not started yet, we'll ask you to adapt your branch to the new code style. * If your work is under review, you'll need to adapt your branch to the new code style before it can be merged. Rebasing a branch is disruptive for reviews, so please synchronize with the reviewers to decide on a good time. We plan to do the switch during the first week of January 2023. Best regards, -- Gilles Peskine Mbed TLS developer 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. -- Mbed-tls-announce mailing list -- mbed-tls-announce(a)lists.trustedfirmware.org To unsubscribe send an email to mbed-tls-announce-leave(a)lists.trustedfirmware.org

3 years, 3 months

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[Mbed-TLS/mbedtls] MS-MPPE-RECV key is not getting correct value in MBEDTLS

by Ajay Mishra

Hi All, I raised the issue below in the MBED-TLS github, as per suggestion from the moderator asking it in the mailing-list. Below are the details. https://github.com/Mbed-TLS/mbedtls/issues/6864 I am running Mbed TLS as a core security library(2.24.0), on an embedded platform. I am using the FreeRADIUS server for AAA authentication. I am able to get the PMK values correctly at the supplicant side, however while decrypting the MPPE key at the gateway side I see that the values are incorrect specially in the API(radius_client_sec_prot_ms_mppe_recv_key_pmk_decrypt) Below are my setup details: FreeRADIUS server setup on Ubuntu(3.2.1) openssl :1.1.1f Ubuntu version : 20.04.04LTS System information Client side setup Platform : Micro controller based platform OS : FreeRTOS Compiler gcc-arm-none-eabi-8-2019-q3-update Sample example MPPE KEY in clear at RADIUS Server Fri Dec 30 23:50:13 2022 : Debug: (209) MS-MPPE-Recv-Key = 0x2f6c3e7e748eb49a598c208af3ef520454f5aa6873bc72f7f32be1053914a566 Fri Dec 30 23:50:13 2022 : Debug: (209) MS-MPPE-Send-Key = 0xa04539819a272e94782af1818b05878bb0e420d08a51accd6c3cb75baaecbd75 PMK Key values at Supplicant(which is same as MPPE-RECV-KEY) PMK Key values at Supplicant(which is same as MPPE-RECV-KEY) 2022-12-30 23:50:07.313 #1 0000000000000000 <log> 0:28:21.215 [debug] [ tlsp] {Wi-SUN Ev}: >>>> PRINT THE KEY PMK >>>> 2022-12-30 23:50:07.313 #1 0000000000000000 <log> 0:28:21.224 [debug] [ tlsp] {Wi-SUN Ev}: EAP-TLS key material 2f:6c:3e:7e:74:8e:b4:9a:59:8c:20:8a:f3:ef:52:04:54:f5:aa:68:73:bc:72:f7:f3:2b:e1:05:39:14:a5:66 which is same as the value that we see at the RADIUS Server. Decrypted key Value at Authenticator(using the API radius_client_sec_prot_ms_mppe_recv_key_pmk_decrypt) 2022-12-30 23:51:34.763 #1 0000000000000000 <log> 3:09:17.919 [debug] [ hmac] {Wi-SUN Ev}: hmac_md key a9:69:02:e9:3a:1d:cd:05:31:b3:77:cd:d6:d7:c2:c7:2d:52:4b:0a:5b:b1:aa:81:20:67:dd:b8:1c:04:ef:63 Mbed TLS version (number or commit id): 2.24.0 Operating system and version: Configuration (if not default, please attach mbedtls_config.h): Compiler and options (if you used a pre-built binary, please indicate how you obtained it): Additional environment information: Expected behavior The key should be decrypted with the correct value. Actual behavior The key is not getting the correct value. Steps to reproduce Additional information Kindly let me know what is missing here ? Thanks in advance. With regards, Ajay. Brentwood, UK.

3 years, 3 months

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Simultaneous accepts

by David Higton

With mbedTLS set up as a streaming server (e.g. https), can it deal with two attempts to connect that arrive in quick succession, so two handshakes are occurring simultaneously? David

3 years, 3 months

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Non-Blocking HTTPS read/write using MbedTLS

by Sritam Paltasingh

I have a working Client code in which I use MbedTLS functions to send HTTPS GET request to my server. For sending data to the server, I use mbedtls_ssl_write(). But this call is blocking. My goal is to make this function call (mbedtls_ssl_write()) non-blocking. What is the correct way to do it ? I read the documentation and concluded that: 1. I have to set the bio callbacks using the mbedtls_ssl_set_bio() function where I have to pass the callback functions as parameters in this function call. 2. I have to set the SSL context as non-blocking using the mbedtls_net_set_nonblock() function call 3. I have used the default bio callbacks, named mbedtls_net_send and mbedtls_net_recv, which are defined in net_sockets.c My question is: After setting the default bio callbacks (mbedtls_net_send and mbedtls_net_recv) and setting the SSL context as non-blocking (mbedtls_net_set_nonblock) which function should I use for non-blocking write/read. Will it be mbedtls_ssl_write() and mbedtls_ssl_read() ? And will the call back functions (which are set using mbedtls_ssl_set_bio) be called when read/write completes? Please help me with advice on how to implement non-blocking write/read using MbedTLS functions. Thanks and Regards, Sritam Paltasingh.

3 years, 3 months

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