- mbed-tls - lists.trustedfirmware.org

by Satya Prakash Prasad

Hi, I was referring to below URLs for understanding key exchange using certificate in TLS framework: https://tls12.xargs.org/ https://tls13.xargs.org/ I have some confusion related to above TLS 1.2 and 1.3 flows and require guidance from your side accordingly. I understand the key exchange using certificates highly depends on configuration and capabilities setup. But then how do we know what goes on a TLS connection based on configuration and setup capabilities? What are the different configurations and when should we set them? I need the same details with reference to a TLS connection setup from a client in our codebase while other for EAP TLS using the below example available in the url below: https://github.com/prplfoundation/hostap/blob/master/eap_example/eap_exampl… Firstly in the above code we do see a lot of configuration and initialization like below: eap_cb.get_config = peer_get_config; eap_cb.get_bool = peer_get_bool; eap_cb.set_bool = peer_set_bool; eap_cb.get_int = peer_get_int; eap_cb.set_int = peer_set_int; eap_cb.get_eapReqData = peer_get_eapReqData; eap_cb.set_config_blob = peer_set_config_blob; eap_cb.get_config_blob = peer_get_config_blob; eap_cb.notify_pending = peer_notify_pending; Whereas our client code which connects to the cloud using certificates to obtain some data in below mentioned way: keyman_creds_for_purpose() - get the creds read and parse the crt.pem, key.pem and trusted_ca.pem files. It make uses of below APis:readfile() - read the file from key storageparse_private_key() & mbedtls_pk_parse_key() - I believe it is for parsing the keys read from file Setup MBed TLS mbedtls_ssl_config_init() - Initialize mbedtls_ssl_configmbedtls_ctr_drbg_init() - CTR_DRBG context initialization mbedtls_ctr_drbg_seed() mbedtls_ssl_conf_rng() mbedtls_ssl_conf_ca_chain() mbedtls_ssl_conf_own_cert() mbedtls_ssl_conf_authmode() t_socket() I am quite new to this code so could have missed or provided wrong info - but I hope I give the overall picture of code implementation - note that this client code is a working code with no issues. My queries are mentioned below: 1) Does the same TLS message flow occur in both cases - our client code and EAP TLS? If not then what's the difference in-between them? 2) How do we understand exact implementation and message flows? 3) What are the different ways to implement TLS connection using certs? 4) Any additional information that can helpful to me like - some references to tutorials / examples / guide would be an added advantage Thanks in advance. Regards, Prakash

1 year, 9 months

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Optimized swap and endianness macros (MBed TLS 2.28.x)

by jojwoos

Hi, when upgrading MBed TLS from 2.16.x to the LTS 2.28.x version on an ARM 32 bit system, I realized that the byte-order macros were collected to one file (common.h) with the possibility to replace them. After writing ARM optimized macros, I checked this topic in the 3.5.x version where it was implemented in a similar way in alignment.h. With this input the following solution was made for the 2.28.x branch: https://github.com/jojwoos/MbedTLS_wrapper A bit late, but maybe someone can still use it:) Perhaps the 64 bit swap, build from two optimized 32bit swaps, can provide some input for the actual 3.5.x version. You can find it at: "// general 64 bit optimization if only 32 bit optimization is available" (32bit ARM systems usually don't have optimized 64bit swap functions) Best regards, Jürgen

1 year, 9 months

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MBed TLS Tutorial

by Satya Prakash Prasad

Hi, Referring to the example as in https://mbed-tls.readthedocs.io/en/latest/kb/how-to/mbedtls-tutorial/ (secure connection) does the secret key exchange takes place in-between server and client. Is there any flowchart / diagram that states what happens during the server client connection - how the keys are exchanged and what types of certs are exchanged, I mean like .pem, X.509 etc? Can we take this way that be it any type of certificate the code implementation is the same for all TLS communication? Thanks in advance. Regards, Prakash

1 year, 9 months

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Unable to Read Encrypted Private Key

by jtrauntvein＠gmail.com

1 year, 9 months

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Apt error for invalid key ID

by S Krishnan, Archanaa

Hello, In psa_validate_key_attributes(), when the key ID is invalid for persistent keys the function returns PSA_ERROR_INVALID_ARGUMENT. See https://github.com/Mbed-TLS/mbedtls/blob/development/library/psa_crypto.c#L…. The comments for PSA_ERROR_INVALID_ARGUMENT explicitly states that this error should not be returned when key identifier is invalid, instead PSA_ERROR_INVALID_HANDLE should be returned. For the above psa_validate_key_attributes() usecase, which is the correct return code - PSA_ERROR_INVALID_ARGUMENT or PSA_ERROR_INVALID_HANDLE? Regards, Archanaa

1 year, 9 months

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Built-in keys for transparent driver

by S Krishnan, Archanaa

Hello, The mbedtls docs (psa_driver_interface.md) mention that only opaque driver supports the use of built-in keys with PSA APIs. Why does a transparent driver not support built-in key feature? Regards, Archanaa

1 year, 10 months

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Request for comments on adding more MBEDTLS_PRIVATE accessors.

by Minos Galanakis

Hi all. We are currently planning on improving our coverage and adding accessor functionality for members marked as MBEDTLS_PRIVATE. I have created an issue ( #8529 )<https://github.com/Mbed-TLS/mbedtls/issues/8529> to consolidate all the information and design-review the task. It would really help to hear from the community as to which members they are still using, and what is their use-case. Feel free to comment on the issue, or discuss it here. There may be members that we have decided not to include and are essential to your integration or are completely missing/not being considered. Best Regards, Minos Galanakis

1 year, 10 months

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MbedTLS Code 3.5.1

by Satya Prakash Prasad

Hi, We need to integrate the TLS Code in our codebase. I have downloaded Mbed TLS 3.5.1 @ https://github.com/Mbed-TLS/mbedtls/releases and compiled it. I understand that we can just use the code in mbedtls-3.5.1\library directory for the TLS functionality - can anyone please confirm. Are there any other directories where TLS Code exists in the MbedTLS 3.5.1 repo? Please confirm how we can only integrate MbedTLS TLS functionality code in other applications / repo. There are so many other directories in MbedTLS 3.5.1 repo - how is the code in repo organized? Do we need all the code in MbedTLS 3.5.1 repo? Your valid input will help me to integrate the MbedTLS Code in our codebase? Please provide all other details as required or will be helpful for the same. Thanks in advance. Regards, Prakash

1 year, 10 months

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Mbed TLS 3.5.1

by Satya Prakash Prasad

Hi, I downloaded Mbed TLS 3.5.1 @ https://github.com/Mbed-TLS/mbedtls/releases. Please let me know how to configure and compile the same. Also please let me know how to run some sample tests there or manually to verify. Thanks in advance. Regards, Prakash

1 year, 11 months

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Code samples for psa_import_key and ECC?

by Christian Huitema

I am trying to use psa_import_key() after loading private keys from PEM files. I am succeeding when parsing an "RSA PRIVATE KEY", but no such luck for "EC PRIVATE KEY". I assume that I am not setting attributes correctly. A code sample would be nice! Or, maybe I could just use mbedtls_pk_parse_keyfile(), but then I would need to "import" a PSA key from the "mbedtls" context, ad I did not find sample code for that either. -- Christian Huitema

1 year, 11 months

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