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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.

2 years, 6 months

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PSA Drivers and "add_entropy" interface.

by Ruchika Gupta

Hi, PSA driver interface specification talks about "add_entropy" entry point. Snippet pasted below. https://github.com/Mbed-TLS/mbedtls/blob/development/docs/proposed/psa-driv… *A driver can declare an entropy source by providing a "get_entropy" entry point. This entry point has the following prototype for a driver with the prefix "acme":* *psa_status_t acme_get_entropy(uint32_t flags, size_t *estimate_bits, uint8_t *output, size_t output_size);* However, in the current implementation of MbedTLS 3.x I don't see this implemented . With the psa_crypto-init() what I observe is that if the platform enables MBEDTLS_ENTROPY_HARDWARE_ALT then using " mbedtls_hardware_poll(), the entropy source can be provided. Can you please confirm if this observation is correct and also let us know if the <driver>_get_entropy() is planned to be implemented in near future ? Regards, Ruchika

2 years, 6 months

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Canceled event: MBed TLS Technical Forum - Asia @ Mon Jan 2, 2023 3am - 3:50am (MST) (mbed-tls@lists.trustedfirmware.org)

by don.harbin＠linaro.org

This event has been canceled. MBed TLS Technical Forum - Asia Monday Jan 2, 2023 ⋅ 3am – 3:50am Mountain Standard Time - Phoenix Trusted Firmware is inviting you to a scheduled Zoom meeting. Topic: MBed TLS Technical Forum - Asia Time: Nov 8, 2021 10:00 AM London Every 4 weeks on Mon, 20 occurrence(s) Nov 8, 2021 10:00 AM Dec 6, 2021 10:00 AM Jan 3, 2022 10:00 AM Jan 31, 2022 10:00 AM Feb 28, 2022 10:00 AM Mar 28, 2022 10:00 AM Apr 25, 2022 10:00 AM May 23, 2022 10:00 AM Jun 20, 2022 10:00 AM Jul 18, 2022 10:00 AM Aug 15, 2022 10:00 AM Sep 12, 2022 10:00 AM Oct 10, 2022 10:00 AM Nov 7, 2022 10:00 AM Dec 5, 2022 10:00 AM Jan 2, 2023 10:00 AM Jan 30, 2023 10:00 AM Feb 27, 2023 10:00 AM Mar 27, 2023 10:00 AM Apr 24, 2023 10:00 AM Please download and import the following iCalendar (.ics) files to your calendar system. Weekly: https://linaro-org.zoom.us/meeting/tJ0kc-GsqDktHNGa8CWl6wJ7je6CKD-5zgh8/ics… Join Zoom Meeting https://linaro-org.zoom.us/j/99948462765?pwd=SGlHYlF1Z2owUDNFWWppaGlSRDh5UT… Meeting ID: 999 4846 2765 Passcode: 196117 One tap mobile +12532158782,,99948462765# US (Tacoma) +13462487799,,99948462765# US (Houston) Dial by your location +1 253 215 8782 US (Tacoma) +1 346 248 7799 US (Houston) +1 669 900 9128 US (San Jose) +1 301 715 8592 US (Washington DC) +1 312 626 6799 US (Chicago) +1 646 558 8656 US (New York) 888 788 0099 US Toll-free 877 853 5247 US Toll-free Meeting ID: 999 4846 2765 Find your local number: https://linaro-org.zoom.us/u/anpWWkRdt Guests Don Harbin - creator nnac123(a)gmail.com santosdanillo(a)gmail.com schoenle.thomas(a)googlemail.com kris.kwiatkowski(a)pqshield.com psa-crypto(a)lists.trustedfirmware.org mbed-tls(a)lists.trustedfirmware.org ~~//~~ Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this email because you are an attendee on the event. To stop receiving future updates for this event, decline this event. Forwarding this invitation could allow any recipient to send a response to the organizer, be added to the guest list, invite others regardless of their own invitation status, or modify your RSVP. Learn more https://support.google.com/calendar/answer/37135#forwarding

2 years, 6 months

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Regarding implementation of MBED CRYPTO libraries without entropy source on baremetal

by PRASHANT TRIPATHI

Dear sir/madam I have following queries regarding implementation of MBED CRYPTO Libraries : 1) How crypto libraries files could be used on baremetal with no entropy source(cross compilation )? 2) How asymmetric cryptographic operations like RSA , RNG , EC ,DSA etc , could be implemented on baremetal without entropy , seed provisions ? 3) If i want to use some custom PRNG and entropy , then how the respective contexts structures could be filled ? Thanks & Regards, *Prashant Tripathi*

2 years, 6 months

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[Mbed-tls-announce] Mbed TLS 3.3.0 and Mbed TLS 2.28.2

by Dave Rodgman via Mbed-tls-announce

Hi Mbed TLS users, We are pleased to announce the release of Mbed TLS versions 3.3.0 and 2.28.2. These releases of Mbed TLS address several security issues, provide bug fixes, and bring other minor changes. Full details are available in the release notes (https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-3.3.0 and https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.28.2 ). We recommend all users to consider whether they are impacted, and to upgrade appropriately. The releases are available from https://github.com/Mbed-TLS/mbedtls/releases Dave Rodgman 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

2 years, 6 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. :) Best regards, Don Harbin TrustedFirmware Community Manager don.harbin(a)linaro.org

2 years, 6 months

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About setting arbitrary RDN while generating a CSR with mbedtls

by Aditya Patwardhan

I am using mbedtls_x509write_csr_set_subject_name API from mbedtls to set the subject name. I wanted to set the arbitrary old value in my certificate for e.g. ffeBgt9jDHhBwPDANgtT7R/1.3.6.1.4.1.37244.2.1=FFF2/1.3.6.1.4.1.37244.2.2=8001 In this case ffeBgt9jDHhBwPDANgtT7R is the CN And 1.3.6.1.4.1.37244.2.1 is an arbitrary OID which has a value of FFF2 similar to the second arbitrary OID. I am able to do this through openssl commands, but while doing it through mbedtls, when I pass it as a string then mbedtls considers the whole string as CN which Is not my intention. Please fine the asn1 parsing of the CSR as below CSR generated through mbedtls: 18:d=5 hl=2 l= 3 prim: OBJECT :commonName 23:d=5 hl=2 l= 76 prim: UTF8STRING :ffeBgt9jDHhBwPDANgtT7R/1.3.7.1.4.1.37466.2.1=FFF2+1.3.7.1.4.1.37466.2.2=8001 101:d=3 hl=2 l= 11 cons: SET 103:d=4 hl=2 l= 9 cons: SEQUENCE Target CSR ( done thorough openssl): 14:d=4 hl=2 l= 29 cons: SEQUENCE 16:d=5 hl=2 l= 3 prim: OBJECT :commonName 21:d=5 hl=2 l= 22 prim: UTF8STRING :ffeBgt9jDHhBwPDANgtT7R 45:d=3 hl=2 l= 20 cons: SET 47:d=4 hl=2 l= 18 cons: SEQUENCE 49:d=5 hl=2 l= 10 prim: OBJECT :1.3.7.1.4.1.37466.2.1 61:d=5 hl=2 l= 4 prim: UTF8STRING :FFF2 67:d=3 hl=2 l= 20 cons: SET 69:d=4 hl=2 l= 18 cons: SEQUENCE 71:d=5 hl=2 l= 10 prim: OBJECT :1.3.7.1.4.1.37466.2.2 83:d=5 hl=2 l= 4 prim: UTF8STRING :8001 89:d=2 hl=2 l= 89 cons: SEQUENCE 91:d=3 hl=2 l= 19 cons: SEQUENCE 93:d=4 hl=2 l= 7 prim: OBJECT :id-ecPublicKey 102:d=4 hl=2 l= 8 prim: OBJECT :prime256v1 Am I missing something here? Do I need to provide the CN in a different way to get the intended result? I found an open issue https://github.com/Mbed-TLS/mbedtls/issues/4886, could it be related to this? Any help would be appreciated. Thanks and Regards, Aditya

2 years, 6 months

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MbedTLS crashes with some websites in mbedtls_mpi_free()

by Peter

Hi All, Some websites crash MbedTLS, in void mbedtls_ecp_point_free( mbedtls_ecp_point *pt ) { if( pt == NULL ) return; mbedtls_mpi_free( &( pt->X ) ); mbedtls_mpi_free( &( pt->Y ) ); mbedtls_mpi_free( &( pt->Z ) ); } It crashes in the last function call of the three above. Thread #1 [main] 1 [core: 0] (Suspended : Signal : SIGTRAP:Trace/breakpoint trap) HardFault_Handler() at stm32f4xx_it.c:103 0x8053c22 <signal handler called>() at 0xffffffed 0x3810180 mbedtls_ecp_point_free() at ecp.c:594 0x8029c7a 0x81030100 It crashes properly i.e. invalid opcodes etc. There is a fair bit on google with others having gone down the same road, never resolved. One site which does it is socata.org but quite a few others do it. Probably 10% of "major name" websites cause it to crash. It may have been undiscovered for a long time, or ever, because most MbedTLS clients are connecting to specific private servers only. People aren't using it to connect to microsoft.com (which doesn't actually crash but the handshake returns 0x2700 which can be investigated). There is a Windows build of MbedTLS (v2.16.2) which seems to work in the crashing cases. Stepping through this in Cube IDE (32F417) it looks like the crash is due to a buffer being filled with random numbers. The guy working on this is contactable only on Monday afternoons so I am a bit screwed :) He said he found something about that buffer, or maybe a corrupted function pointer. But as I said this issue has come up before according to numerous online searches and maybe someone can recognise it. Hardware AES is enabled but this occurs with software AES also. No other 32F417 hardware crypto features are used, other than its random number generator. TLS is v2.16.2. Thank you in advance for any pointers. Peter

2 years, 6 months

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Reminder: MBed TLS Technical Forum - Asia

by Don Harbin

Hi All, A gentle reminder that the Asia-Europe timezone-friendly MBed TLS Tech forum is next *Monday, Dec 5 at 10:00am UK time*. Invite details can be found on the online calendar here <https://www.trustedfirmware.org/meetings/>. As usual, if anyone has any topics, please let Dave Rodgman, cc'd, know. :) Best regards, Don Harbin TrustedFirmware Community Manager don.harbin(a)linaro.org

2 years, 7 months

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RSA signature with Montgomery

by Prasad Hegde

Hi, Is there any API's available to convert the RSA signature to the Montgomery format. Thanks Prasad

2 years, 7 months

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