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Request for feedback about Mbed TLS 4: RSA private key import

by Gilles Peskine

Hello, This is a request for feedback about the next major release of Mbed TLS (TF-PSA-Crypto 1.0 + Mbed TLS 4,0). (Mbed TLS 3.6 LTS will remain supported with its current feature set until at least Q2 2027.) Please reply to this thread or on the GitHub issue linked below. If you wish to leave feedback privately, you can reply privately and your feedback will be anonymized before sharing outside Arm. https://github.com/Mbed-TLS/TF-PSA-Crypto/issues/105 Mbed TLS 4 and TF-PSA-Crypto will complete our migration to PSA cryptography APIs. For simplicity, PSA only requires implementations to support complete representations RSA private keys, where all the fields are provided (n, e, d, p, q, dp, dq, u). Thus, with only PSA APIs, it is not possible to import an RSA private key without the public exponent, or an RSA private key without the CRT parameters. Should TF-PSA-Crypto provide an extension to support such private keys? If you need this, please let us know about your use case. Best regards, -- Gilles Peskine Mbed TLS developer

2 years, 3 months

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Request for feedback about Mbed TLS 4: custom ECC mechanisms

by Gilles Peskine

Hello, This is a request for feedback about the next major release of Mbed TLS (TF-PSA-Crypto 1.0 + Mbed TLS 4,0). (Mbed TLS 3.6 LTS will remain supported with its current feature set until at least Q2 2027.) Please reply to this thread or on the GitHub issue linked below. If you wish to leave feedback privately, you can reply privately and your feedback will be anonymized before sharing outside Arm. https://github.com/Mbed-TLS/TF-PSA-Crypto/issues/102 Mbed TLS 4 and TF-PSA-Crypto will complete our migration to PSA cryptography APIs, which are higher-level than the legacy mbedtls_xxx() APIs in Mbed TLS ≤3.x. As a consequence, the API will only provide access to ECC-based cryptographic mechanisms such as ECDH, ECDSA and ECJPAKE. (ECIES can be implemented on top of ECDH. Support for EdDSA and SPAKE2+ is planned, but might not be ready at the 4.0 release time.) It will not provide access to ECC arithmetic functions such as mbedtls_ecp_muladd(). Do you need custom ECC-based mechanisms (e.g. custom PAKE)? If so, please let us know which mechanisms and what arithmetic they require. We are not currently planning to make it possible to use such mechanisms without patching the TF-PSA-Crypto code. Best regards, -- Gilles Peskine Mbed TLS developer

2 years, 3 months

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Request for feedback about Mbed TLS 4: custom RSA mechanisms

by Gilles Peskine

Hello, This is a request for feedback about the next major release of Mbed TLS (TF-PSA-Crypto 1.0 + Mbed TLS 4,0). (Mbed TLS 3.6 LTS will remain supported with its current feature set until at least Q2 2027.) Please reply to this thread or on the GitHub issue linked below. If you wish to leave feedback privately, you can reply privately and your feedback will be anonymized before sharing outside Arm. https://github.com/Mbed-TLS/TF-PSA-Crypto/issues/104 Mbed TLS 4 and TF-PSA-Crypto will complete our migration to PSA cryptography APIs, which are higher-level than the legacy mbedtls_xxx() APIs in Mbed TLS ≤3.x. As a consequence, the API will only provide access to RSA-based encryption and signature mechanisms (PKCS#1v1.5 encryption, OAEP, PKCS#1v1.5 signature, RSS), not to the low-level RSA-public and RSA-private operations. Do you need custom RSA-based mechanisms (e.g. full-domain encryption or hashing)? If so, please let us know. We are not currently planning to make it possible to use such mechanisms without patching the TF-PSA-Crypto code. Best regards, -- Gilles Peskine Mbed TLS developer

2 years, 3 months

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Request for feedback about Mbed TLS 4: DES (including 3DES)

by Gilles Peskine

Hello, This is a request for feedback about the next major release of Mbed TLS (TF-PSA-Crypto 1.0 + Mbed TLS 4,0). (Mbed TLS 3.6 LTS will remain supported with its current feature set until at least Q2 2027.) Please reply to this thread or on the GitHub issue linked below. If you wish to leave feedback privately, you can reply privately and your feedback will be anonymized before sharing outside Arm. https://github.com/Mbed-TLS/mbedtls/issues/9164 We are considering fully removing DES, including 3DES, from the library. Is any DES variant still relevant to Mbed TLS users these days? If you want Mbed TLS 4 to include DES, please let us know what you're using it for. Reasons to remove: it's long obsolete, and no longer accepted even by NIST except to handle legacy data. Removing it would be one less module to support and would allow generic block cipher code to focus on modern ciphers with 128-bit blocks. Best regards, -- Gilles Peskine Mbed TLS developer

2 years, 3 months

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MBEDTLS Default Search Path

by Frozen Forest

I am trying to build *https://github.com/ithewei/libhv <https://github.com/ithewei/libhv>* with MBEDTLS on Windows but it doesn't have include and library define options on *CMake*. When I ask them with an issue on *GitHub*, they said I need to use *"Default Search Path"*. I installed it with *cmake --build . --config Release --target INSTALL *and I can see it in *Program Files/MBed TLS. *I think I need to define an environment variable. But what is correct names for includes and libraries ?

2 years, 3 months

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Certificate validation

by Sushma Narayan Shetty

Hi Team, Need support on one the below query. I had previously raised this in issue #9116 : Client certificate verify · Issue #9116 · Mbed-TLS/mbedtls · GitHub<https://github.com/Mbed-TLS/mbedtls/issues/9116> .However I was asked to redirect the query to the mbedTLS support. Q#1 : I have a client certificate chain (end entity cert, intermediate cert and root cert) and I have got 1 public key (extracted from root CA cert) on my server. Is there any way in mbedTLS where I can validate the client certificate using just the public key of the root CA and not the whole root CA certificate on my server? As per my understanding of CA and certificate validation we would need a whole CA cert and not just the public key of the root certificate. However, I would like to know if there are any API's in mbedTLS for this validation? Thanks, Sushma ________________________________ Disclaimer: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you are not the intended recipient of this message , or if this message has been addressed to you in error, please immediately alert the sender by reply email and then delete this message and any attachments. If you are not the intended recipient, you are hereby notified that any use, dissemination, copying, or storage of this message or its attachments is strictly prohibited. Email transmission cannot be guaranteed to be secure or error-free, as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender, therefore, does not accept liability for any errors, omissions or contaminations in the contents of this message which might have occurred as a result of email transmission. If verification is required, please request for a hard-copy version. ________________________________

2 years, 4 months

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Testing an an Ubuntu VM, issue with configuration

by Christian Huitema

I am testing a test program in an Ubuntu VM, and I have an issue. I started by configuring MbedTLS in "full" mode (scripts/config.py full), but in that case the linker fails, "in function `psa_load_builtin_key_into_slot`, psa_crypto_slot_management.c: undefined reference to 'mbedtls_psa_platform_get_builtin_key`. I can suppress the error by editing `include\mbedtls\mbedtls_config.h` and removing the option `MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS`. The compile succeeds, but the call to `psa_crypto_init` fails when initializing the RNG module. I am struggling. I must be making some mistake, I will keep trying to understand, but I would appreciate a little bit of help! -- Christian Huitema

2 years, 4 months

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UTF-8 in code files

by Stephan Koch

Hello Mbed TLS team, Mbed TLS 3.6 introduced the first UTF-8 characters “±” in source code, see mbedtls_config.h, line 4179: * at the same pace. The typical accuracy of an RTC crystal is ±100 to ±20 parts Is this intended? Thanks Stephan

2 years, 4 months

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Using the "psa_verify_message" function

by Christian Huitema

The specification of the "psa_verify_message" function is simple enough: pass a key ID, an algorithm ID, the data that were signed, the signature received from the peer, and receive a status. There is just one tiny problem: in the application, the algorithm ID is specified as a 16 bit TLS SignatureScheme (https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-si…), which is not quite the same as "psa_algorithm_t". Is there a simple way to covert from TLS SignatureScheme to PSA ALgorithm identifier? Maybe a two columns table? -- Christian Huitema

2 years, 4 months

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Error while parsing certificate

by Subramanian Gopi Krishnan

Hi, I have an inhouse developed secure authentication program that uses certificate for authentication. I have used mbedtls library for the x.509 certificate verification purpose. In our custom PKI we have only three level of certificates, Root-CA -> Intermediate-CA -> Device-Cert. The embedded device has very limited memory, so instead of sending whole certificate chain, the devices communicates intermediate_CA and device cert (in der format base64 encoded) in separate packet. Root-CA will be available on node as trusted-ca. Intermediate is verified against Root; then device cert is verified against intermediate. The problem is, the poc developed on linux platform is working fine - but on embedded platform I encounter either 0x3b00(parsing failed) or 0x2700(with flag 8). Also the error code are inconsistent. I verified the integrity of packet with certificate using crc16. So no chance of certificate getting corrupted. Also verified the certificate's base64 format integrity using crc16. All certificates are sha256WithRSAEncryption; RSA Public-Key: (4096 bit) Attached config.h on target platform for reference - could you help me if anything wrong with configuration. While trying to trace, the flag was set from x509_crt.c from below code. /* No parent? We're done here */ if( parent == NULL ) { printf("NO_PARENT\r\n"); *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; return( 0 ); } Any clue would be helpful. Thanks, Gopi Krishnan

2 years, 4 months

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