March 2023 - mbed-tls - lists.trustedfirmware.org

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 months, 3 weeks

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Reminder: MBed TLS Tech 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

1 year, 2 months

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[Mbed-tls-announce] New Mbed TLS releases : 3.4.0 and 2.28.3

by Paul Elliott via Mbed-tls-announce

Hi Mbed TLS users, We have released Mbed TLS versions 3.4.0 and 2.28.3 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-3.4.0, https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.28.3). We recommend all users to consider whether they are impacted, and to upgrade appropriately. The Mbed TLS team 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

1 year, 3 months

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support of EC and hashing algorithms

by c.luetzenkirchen＠innolectric.ag

hello, I am currently evaluating if latest mbed-TLS release does support following algorithms: - ECDSA using secp521r1 curve - EDDSA using Edwards curves 448 or 448-Goldilocks - ECDH using mentioned curves - SHA512 - SHAKE256 For some of them like SHA512 I found information in the documentation. Others like EDDSA and SHAKE256 seem to be incomplete. Is my assumption correct that TLS 1.3 is therefore NOT ready to use yet? Best regards, Chris

1 year, 4 months

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Question about long-time support for 3.x branch

by Maher Azarkan

Hello everyone, We are currently using the mbedTLS version 2.16.12 in our firmware and we are planning an update to a newer branch. I would like to know, how long the different 3.x branches will be supported. Is there any fix roadmap, how long an mbedTLS branch must be supported and maintained after its first release? I could only find this information for the 2.28 branch (support until end of 2024). Thank you for any help you can offer. Best regards Maher Azarkan Hilscher Gesellschaft f?r Systemautomation mbH Rheinstra?e 15 / D-65795 Hattersheim / Germany Sitz der Gesellschaft / place of business: Hattersheim | Gesch?ftsf?hrer / managing director: Sebastian Hilscher, Hans-J?rgen Hilscher Handelsregister / commercial register: Frankfurt B 26873 | Ust. Idnr. / VAT No.: DE113852715 Registergericht / register court: Amtsgericht Frankfurt/Main Important Information: This e-mail message including its attachments contains confidential and legally protected information solely intended for the addressee. If you are not the intended addressee of this message, please contact the addresser immediately and delete this message including its attachments. The unauthorized dissemination, copying and change of this e-mail are strictly forbidden. The addresser shall not be liable for the content of such changed e-mails. Wichtiger Hinweis: Diese E-Mail einschlie?lich ihrer Anh?nge enth?lt vertrauliche und rechtlich gesch?tzte Informationen, die nur f?r den Adressaten bestimmt sind. Sollten Sie nicht der bezeichnete Adressat sein, so teilen Sie dies bitte dem Absender umgehend mit und l?schen Sie diese Nachricht und ihre Anh?nge. Die unbefugte Weitergabe, das Anfertigen von Kopien und jede Ver?nderung der E-Mail ist untersagt. Der Absender haftet nicht f?r Inhalte von ver?nderten E-Mails.

1 year, 4 months

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Porting from OpenSSL to MbedTLS

by matteo.cogi＠alice.it

Dear all, I need to migrate from OpenSSL to MbedTLS. I have to implement a SCEP client in my embedded environment composed by FreeRTOS as OS, mbedTLS as security layer and LwIP as network stack. The best candidate for the SCEP client role is the sscep library. It works very well under Ubuntu, but now I need to use it in my embedded environment, so I have to adapt sscep for MbedTLS. I would like to know if there is some porting/migration guide from OpenSSL to MbedTLS. Any kind of suggestion or support will be appreciated. Thanks in advance. Regards, Matteo

1 year, 4 months

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Reminder: MBed TLS Tech Forum - Asia/Europe

by Don Harbin

Hi All, A gentle reminder that the Asia-Europe timezone-friendly MBed TLS Tech forum is next Monday at 10:00am 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

1 year, 4 months

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Connect using IP address instead of URL "509 - Certificate verification failed, e.g. CRL, CA or signature check failed"

by M M

I am using MbedTLS client code based on this: https://github.com/machinezone/IXWebSocket/blob/master/ixwebsocket/IXSocket… I am connecting to a server via it's URL. However, I would like to connect directly using an IP address returned from running the traceroute command on the URL. So I replaced the URL with the IP address. However, MBedTLS fails on the handshake: https://github.com/machinezone/IXWebSocket/blob/master/ixwebsocket/IXSocket… I get the error: "error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed" If I revert back to URL, it works. The IP address does exist. How can I connect using the IP address, instead of the URL?

1 year, 4 months

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security issue in mbedtls 3.30

by Avi Epstein

security issue in mbedtls 3.30 in the release notes: "An adversary with access to precise enough information about memory accesses (typically, an untrusted operating system attacking a secure enclave) could recover an RSA private key after observing the victim performing a single private-key operation if the window size used for the exponentiation was 3 or smaller. Found and reported by Zili KOU, Wenjian HE, Sharad Sinha, and Wei ZHANG. See "Cache Side-channel Attacks and Defenses of the Sliding Window Algorithm in TEEs" - Design, Automation and Test in Europe 2023." was this issue solved in this version?

1 year, 4 months

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ECDSA read_signature returns "invalid signature" status

by Tilen Majerle

Hello, I have 3rd party custom ECC library, that can do ECDSA verification and uses secp256r1 compressed public key (33bytes) to do so - all works fine. Now I want to migrate to mbedTLS, to also benefit of other crypto schemes, hence use of mbedtls ECDSA was a natural way to go. Here I need (as I understand) PEM parser or optionally public key in uncompressed format (0x04 | X | Y). Problem is that loading of the key seems to work (func returns 0), but verification fails with -20450, indicating (if I well understood) invalid signature. Test data. PRIVATE KEY: -----BEGIN PRIVATE KEY----- MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgKNqyWso/lMuTlTE6 ll47Jboqq/Iz7OYDrr7TuXN+s2ChRANCAARNgfaUcxLoWWG01ekJFiqB8ujMgnHz P320ZgiZErH6zKjlB9EovIHrchj0240+EIpFios+2uM609FgRvu3+NrT -----END PRIVATE KEY----- PUBLIC KEY: -----BEGIN PUBLIC KEY----- MDkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDIgADTYH2lHMS6FlhtNXpCRYqgfLozIJx 8z99tGYImRKx+sw= -----END PUBLIC KEY----- PUBLIC KEY UNCOMPRESSED SEC1: 0x4,0x4d,0x81,0xf6,0x94,0x73,0x12,0xe8,0x59,0x61,0xb4,0xd5,0xe9,0x9,0x16,0x2a,0x81,0xf2,0xe8,0xcc,0x82,0x71,0xf3,0x3f,0x7d,0xb4,0x66,0x8,0x99,0x12,0xb1,0xfa,0xcc,0xa8,0xe5,0x7,0xd1,0x28,0xbc,0x81,0xeb,0x72,0x18,0xf4,0xdb,0x8d,0x3e,0x10,0x8a,0x45,0x8a,0x8b,0x3e,0xda,0xe3,0x3a,0xd3,0xd1,0x60,0x46,0xfb,0xb7,0xf8,0xda,0xd3 PUBLIC KEY COMPRESSED SEC1: 0x3,0x4d,0x81,0xf6,0x94,0x73,0x12,0xe8,0x59,0x61,0xb4,0xd5,0xe9,0x9,0x16,0x2a,0x81,0xf2,0xe8,0xcc,0x82,0x71,0xf3,0x3f,0x7d,0xb4,0x66,0x8,0x99,0x12,0xb1,0xfa,0xcc INPUT STRING in TEXT format: "This is my input data" (remove quotes) INPUT STRING in HEX format: 0x54,0x68,0x69,0x73,0x20,0x69,0x73,0x20,0x6d,0x79,0x20,0x69,0x6e,0x70,0x75,0x74,0x20,0x64,0x61,0x74,0x61 SHA256 of INPUT STRING: 0xa7,0x3f,0x26,0xf4,0xa1,0xe4,0x61,0x61,0x0,0x1a,0x29,0xdf,0xd2,0xaf,0x7d,0xa,0x25,0x91,0xbb,0xcc,0x1f,0xbc,0xfb,0xdb,0x43,0xdb,0x57,0xf9,0x8d,0x94,0xeb,0x81 (x-checked here: https://emn178.github.io/online-tools/sha256.html) SIGNATURE of HASH signed with PRIVATE KEY: 0x80,0xe6,0xf5,0x97,0x6a,0x66,0xa2,0xe2,0x9a,0xd7,0x7f,0x9a,0x9b,0x3e,0x2b,0xde,0x1f,0x7c,0x3,0xb3,0x1,0xb8,0x6f,0xd8,0xf6,0xf,0x27,0x38,0x63,0x3,0x54,0x74,0x76,0x6d,0x1b,0x97,0xf0,0xbc,0xc5,0xd2,0x4b,0xae,0xf0,0x34,0xab,0x86,0xbd,0x55,0x0,0x8a,0x4c,0x9f,0x4e,0xa5,0x53,0x89,0xe8,0x0,0xb9,0x83,0x24,0x87,0x98,0x1 My custom library code looks like - this one works as expected: if (ecdsa_verify(public_key_compressed_33_bytes_array, hash_of_input_string, signature_signed_with_private_key)) { printf("Custom ECDSA lib verification is OK\r\n"); } My mbedTLS code looks like: ``` /* mbedTLS */ printf("mbedTLS way start\r\n"); mbedtls_ecdsa_init(&ctx); mbedtls_ecp_group_load(&ctx.private_grp, MBEDTLS_ECP_DP_SECP256R1); res = mbedtls_ecp_point_read_binary(&ctx.private_grp, &ctx.private_Q, ecc_public_key_uncompressed_bin, sizeof(ecc_public_key_uncompressed_bin)); if (res != 0) { printf("ECP point read binary failed: %d\r\n", res); } res = mbedtls_ecdsa_read_signature(&ctx, data_raw_hash_digest, sizeof(data_raw_hash_digest), signature, sizeof(signature)); if (res == 0) { printf("mbedTLS Verification is OK...\r\n"); } else { printf("mbedTLS Verification failed...: %d\r\n", res); } printf("mbedTLS way end\r\n"); ``` and it always fails with error code -20450. while loading keys function goes through well. Am I wrongly loading the keys?

1 year, 4 months

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mbed-tls March 2023