Hi Mate,
I had a look and I couldn’t find such a feature implemented either. I don’t think that Mbed TLS supports that at the moment.
Best regards,
Janos
From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of "Z.Máté via mbed-tls" <mbed-tls(a)lists.trustedfirmware.org>
Reply to: "Z.Máté" <enleszekakalozkiraly(a)gmail.com>
Date: Monday, 2 November 2020 at 21:01
To: "mbed-tls(a)lists.trustedfirmware.org" <mbed-tls(a)lists.trustedfirmware.org>
Subject: [mbed-tls] Write private key into buffer using encrypted PEM format
Dear mbedtls list members!
Sorry if this is the second time I ask, I'm not sure the previous question is still on the list.
I'm asking if there's a way to export a private key into a buffer in an encrypted format. So that mbedtls_pk_parse_key() has to be called with a password.
In the example program key_app.c (I hope that's how it's called) I can see there are password encrypted PEM formatted keys. But how to generate one?
For clarity, this is the type of header I'm looking for.
—–BEGIN RSA PRIVATE KEY—–
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-256-CBC,AB8E2B5B2D989271273F6730B6F9C687
……………………………………………….
……………………………………………….
………………………………………
—–END RSA PRIVATE KEY—–
I was only able to generate something like this by, using command line openssl. But I'd like a better solution, in code, using mbedtls.
Yours
Zombor Máté
Hello,
Thank you for your interest in the PSA crypto API.
On 28/10/2020 15:20, François Beerten via mbed-tls wrote:
>
> Hi everybody,
>
> After reading the PSA Crypto API specs (as on
> https://armmbed.github.io/mbed-crypto/html/overview/functionality.html)
> and looking at the mbed TLS library, a few questions came up.
>
> Is there some repository with the sources of the PSA Crypto API specs
> where one can follow the evolution and eventually send proposals and
> patches ?
>
The PSA specification drafts are not public. You can send feedback about
the PSA Crypto application and driver interfaces on the psa-crypto
mailing list (psa-crypto(a)lists.trustedfirmware.org,
https://lists.trustedfirmware.org/mailman/listinfo/psa-crypto). If you
prefer to send confidential feedback, you can email mbed-crypto(a)arm.com
(feedback at this address will only be discussed inside Arm). An issue
in the Mbed TLS repository will also reach PSA Crypto architects.
> A note says "Hash suspend and resume is not defined for the SHA3
> family of hash algorithms". Why are they not defined for SHA3 ?
>
The hash suspend/resume operations marshall the internal state of the
hash operation. They mimic an existing JavaCard API
(https://docs.oracle.com/javacard/3.0.5/api/javacard/security/InitializedMes…).
There is a de facto standard representation of the internal state for
common Merkle-Damgård constructions, which covers all the currently
defined hash algorithms except SHA3. If there's interest in this
functionality, we could standardize a representation for SHA3.
> How can or should one add support in PSA Crypto AP for not yet defined
> algorithms (for example a KDF) ?
>
Answer from a PSA Crypto architect: preferably by requesting an encoding
for this KDF as a PSA_ALG_xxx value (as well as new
PSA_KEY_DERIVATION_INPUT_xxx values if applicable). If you can't do
that, use an encoding in the vendor range (most significant bit set).
The world of key derivation functions is unfortunately messy: there are
many similar, but not functionally equivalent constructions (such as
hashing a secret together with a nonce, formatted in all kinds of
different ways). The set of KDF in PSA Crypto 1.0.0 was the minimum set
required for the TLS protocol. We expect 1.0.x updates to define more
KDF algorithms.
Answer from an Mbed TLS maintainer: contributing an implementation would
be appreciated (but not required).
> In multipart operations, can the user reuse the input buffers
> immediately after doing an 'update' (for example after
> psa_hash_update()) ? And can he reuse the input buffers immediately
> after some "setup" functions like psa_cipher_set_iv() or
> psa_aead_set_nonce() ?
>
Yes. PSA crypto API functions that take a buffer as a parameter never
take ownership of that buffer. Once the function returns, you can do
whatever you want with the buffer.
The PSA specification even guarantees that you can use the same buffer,
or overlapping buffers, as inputs and outputs to the same function call.
However beware that the Mbed TLS implementation does not always support
such overlap (https://github.com/ARMmbed/mbedtls/issues/3266).
> Do you plan to support (pure) ED25519 and ED448 only via
> psa_sign_message() and psa_verify_message() ? What about messages in
> multiple chunks ?
>
We plan to add a multi-part message signature interface, both for the
sake of pureEdDSA and suitable for Mbed TLS's restartable ECDSA. I
expect the design to be “what you'd expect” but I haven't yet verified
that there aren't any gotchas.
> In psa_asymmetric_encrypt(), why is the salt provided explicitely.
> Shouldn't it be generated randomly internally when needed ?
>
Some applications use a fixed or deterministic salt which they check on
decryption. Note that this parameter is what PKCS#1 calls “label”.
> With PSA Crypto API, you define a flexible API for cryptographic
> operations. Apparently, other providers could make their own
> implementation of PSA Crypto API. Will mbed TLS then be able to use
> those alternate PSA Crypto API implementations ? How would that work
> practically ?
>
The X.509 and TLS layer of Mbed TLS are currently designed to use the
mbedtls_xxx crypto API. We have already added partial support for the
psa_xxx crypto API (with MBEDTLS_USE_PSA_CRYPTO), however it is not yet
possible to fully decouple the X.509/TLS layers from the Mbed TLS crypto
implementation. (I think this is already possible for a small set of
cipher suites, but it isn't something that we've tried or currently
actively support.) Before this can happen, some Mbed TLS APIs need to
change, which will happen in 2021 with Mbed TLS 3.0. After that, we plan
to decouple the PSA crypto reference implementation (Mbed TLS's current
crypto implementation) from the X.509/TLS layer (which will remain “Mbed
TLS”). Our plans
(https://developer.trustedfirmware.org/w/mbed-tls/roadmap/) that far
into the future are still vague and may change.
Note that for the most common case of wanting a different implementation
of cryptography, which is to leverage hardware such as accelerators and
secure elements, PSA is defining a driver interface which is currently
being implemented in Mbed TLS
(https://github.com/ARMmbed/mbedtls/blob/development/docs/proposed/psa-drive…).
The driver interface lets you combine mechanisms supported by your
hardware with Mbed TLS's implementation for mechanisms without hardware
support.
--
Gilles Peskine
PSA Cryptography architect and Mbed TLS developer
> Thank you for your attention,
>
> François.
>
>
>
Dear mbedtls list members!
Sorry if this is the second time I ask, I'm not sure the previous question
is still on the list.
I'm asking if there's a way to export a private key into a buffer in an
encrypted format. So that mbedtls_pk_parse_key() has to be called with a
password.
In the example program key_app.c (I hope that's how it's called) I can see
there are password encrypted PEM formatted keys. But how to generate one?
For clarity, this is the type of header I'm looking for.
—–BEGIN RSA PRIVATE KEY—–
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-256-CBC,AB8E2B5B2D989271273F6730B6F9C687
……………………………………………….
……………………………………………….
………………………………………
—–END RSA PRIVATE KEY—–
I was only able to generate something like this by, using command line
openssl. But I'd like a better solution, in code, using mbedtls.
Yours
Zombor Máté
Hi All,
Gentle reminder about the Mbed TLS workshop tomorrow (Tuesday, November 3rd) from 2 to 6pm GMT.
See agenda and zoom link here - https://www.trustedfirmware.org/meetings/mbed-tls-workshop/
Thanks,
Shebu
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To: Trusted Firmware Public Meetings; Shebu Varghese Kuriakose; mbed-tls(a)lists.trustedfirmware.org; Don Harbin; psa-crypto(a)lists.trustedfirmware.org; Dave Rodgman
Subject: Mbed TLS Virtual Workshop
When: Tuesday, November 3, 2020 2:00 PM-6:00 PM (UTC+00:00) Dublin, Edinburgh, Lisbon, London.
Where: Zoom: https://linaro-org.zoom.us/j/95315200315?pwd=ZDJGc1BZMHZLV29DTmpGUllmMjB1UT…
You have been invited to the following event.
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When
Tue Nov 3, 2020 7am – 11am Mountain Standard Time - Phoenix
Where
Zoom: https://linaro-org.zoom.us/j/95315200315?pwd=ZDJGc1BZMHZLV29DTmpGUllmMjB1UT… (map<https://www.google.com/maps/search/Zoom:+https:%2F%2Flinaro-org.zoom.us%2Fj…>)
Calendar
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•
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•
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more details »<https://www.google.com/calendar/event?action=VIEW&eid=NHVvY2FxY2o4Njk3MWZkd…>
Hi,
Trustedfirmware.org community project would like to invite you to the Mbed TLS Virtual Workshop.
The purpose of the workshop is to bring together the Mbed TLS community including maintainers, contributors and users to discuss
* The future direction of the project and
* Ways to improve community collaboration
Here is the agenda for the workshop.
Topic Time (in GMT)
Welcome 2.00 - 2.10pm
Constant-time code 2.10 – 2.30pm
Processes - how does work get scheduled? 2.30 – 2.50pm
PSA Crypto APIs 2.50 – 3.20pm
PSA Crypto for Silicon Labs Wireless
MCUs - Why, What, Where and When 3.20 – 3.50pm
Break
Roadmap, TLS1.3 Update 4.10 – 4.30pm
Mbed TLS 3.0 Plans, Scope 4.30 – 5.00pm
How do I contribute my first review
and be an effective Mbed TLS reviewer 5.00 – 5.30pm
Regards,
Don Harbin
Trusted Firmware Community Manager
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Dear mbedtls list members!
Is there a way to write a private key into a buffer, in PEM format, by
using a password for encryption? Mbedtls is able to parse encrypted PEM
files so can I write one? I couldn't really find any info regarding it,
only an older, unfinished github issue ...
Yours
Zombor Máté
Hello François,
The following is my understanding, I am not a maintainer but a user of
mbedtls. My response below only addresses a few of your questions.
PSA appears to be bound to what mbedtls currently supports, this does not
include Ed25519 or Ed448 at this time. A pull request is currently open for
this feature development https://github.com/ARMmbed/mbedtls/pull/3245
Further development may be necessary to include those in PSA.
The only implementation of PSA that I know of is one that wraps around
mbedtls.
Best,
Levi
On Wed, Oct 28, 2020 at 9:20 AM François Beerten via mbed-tls <
mbed-tls(a)lists.trustedfirmware.org> wrote:
> Hi everybody,
>
> After reading the PSA Crypto API specs (as on
> https://armmbed.github.io/mbed-crypto/html/overview/functionality.html)
> and looking at the mbed TLS library, a few questions came up.
>
> Is there some repository with the sources of the PSA Crypto API specs
> where one can follow the evolution and eventually send proposals and
> patches ?
>
> A note says "Hash suspend and resume is not defined for the SHA3 family of
> hash algorithms". Why are they not defined for SHA3 ?
>
> How can or should one add support in PSA Crypto AP for not yet defined
> algorithms (for example a KDF) ?
>
> In multipart operations, can the user reuse the input buffers immediately
> after doing an 'update' (for example after psa_hash_update()) ? And can
> he reuse the input buffers immediately after some "setup" functions like
> psa_cipher_set_iv() or psa_aead_set_nonce() ?
>
> Do you plan to support (pure) ED25519 and ED448 only via
> psa_sign_message() and psa_verify_message() ? What about messages in
> multiple chunks ?
>
> In psa_asymmetric_encrypt(), why is the salt provided explicitely.
> Shouldn't it be generated randomly internally when needed ?
>
> With PSA Crypto API, you define a flexible API for cryptographic
> operations. Apparently, other providers could make their own implementation
> of PSA Crypto API. Will mbed TLS then be able to use those alternate PSA
> Crypto API implementations ? How would that work practically ?
>
> Thank you for your attention,
>
> François.
>
>
> --
> mbed-tls mailing list
> mbed-tls(a)lists.trustedfirmware.org
> https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls
>
I make a CA certificate for JITR using BouncyCastle lib in the android app as the below example
And a device certificate is generated by this certificate in mbed_tls. At this time, JITR is not working.
Namely, a device certificate is not registered in AWS.
But In the case of making a ca certificate using OPENSSL, JITR works normally.
Below is CA certificate based BouncyCastle lib.
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN EC PRIVATE KEY-----
MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQgU9pUZUfplZyhC+mH
Pt8pthLItdpbJ+Qy47r7gJKTNvCgCgYIKoZIzj0DAQehRANCAARJJ2HaiNwnVZZj
JE5qikutx5x3OT28gX39UaJBhujROs99YpQPGLdnxhRyJZ9ZELcf/+rLQQNWyKoq
rEqPMGne
-----END EC PRIVATE KEY-----
BRs.
Hyunung Park
Hi everybody,
After reading the PSA Crypto API specs (as on
https://armmbed.github.io/mbed-crypto/html/overview/functionality.html)
and looking at the mbed TLS library, a few questions came up.
Is there some repository with the sources of the PSA Crypto API specs
where one can follow the evolution and eventually send proposals and
patches ?
A note says "Hash suspend and resume is not defined for the SHA3 family
of hash algorithms". Why are they not defined for SHA3 ?
How can or should one add support in PSA Crypto AP for not yet defined
algorithms (for example a KDF) ?
In multipart operations, can the user reuse the input buffers
immediately after doing an 'update' (for example after
psa_hash_update()) ? And can he reuse the input buffers immediately
after some "setup" functions like psa_cipher_set_iv() or
psa_aead_set_nonce() ?
Do you plan to support (pure) ED25519 and ED448 only via
psa_sign_message() and psa_verify_message() ? What about messages in
multiple chunks ?
In psa_asymmetric_encrypt(), why is the salt provided explicitely.
Shouldn't it be generated randomly internally when needed ?
With PSA Crypto API, you define a flexible API for cryptographic
operations. Apparently, other providers could make their own
implementation of PSA Crypto API. Will mbed TLS then be able to use
those alternate PSA Crypto API implementations ? How would that work
practically ?
Thank you for your attention,
François.
Hi Frank,
The issue exists because you are downloading a tag and not the release. The 2.16.8 release is available here:
https://github.com/ARMmbed/mbedtls/archive/v2.16.8.tar.gz
Best regards,
Janos
On 28/10/2020, 12:15, "mbed-tls on behalf of Frank Bergmann via mbed-tls" <mbed-tls-bounces(a)lists.trustedfirmware.org on behalf of mbed-tls(a)lists.trustedfirmware.org> wrote:
Hi Gilles,
I noticed that the "double name" does still exist in some archive files:
$ wget -q -O - https://github.com/ARMmbed/mbedtls/archive/mbedtls-2.16.8.tar.gz|tar tzf -|head
mbedtls-mbedtls-2.16.8/
mbedtls-mbedtls-2.16.8/.github/
mbedtls-mbedtls-2.16.8/.github/issue_template.md
mbedtls-mbedtls-2.16.8/.github/pull_request_template.md
mbedtls-mbedtls-2.16.8/.gitignore
mbedtls-mbedtls-2.16.8/.globalrc
mbedtls-mbedtls-2.16.8/.pylintrc
mbedtls-mbedtls-2.16.8/.travis.yml
mbedtls-mbedtls-2.16.8/CMakeLists.txt
mbedtls-mbedtls-2.16.8/CONTRIBUTING.md
cheers,
Frank
On Tue, Aug 04, 2020 at 09:18:56PM +0000, Gilles Peskine via mbed-tls wrote:
[...]
> The naming with mbedtls-mbedtls- must be a bug in our release script.
[...]
--
Frank Bergmann, Pödinghauser Str. 5, D-32051 Herford, Tel. +49-5221-9249753
SAP Hybris & Linux LPIC-3, E-Mail tx2014(a)tuxad.de, USt-IdNr DE237314606
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http://www.gulp.de/freiberufler/2HNKY2YHW.html -- Profile at GULP
--
mbed-tls mailing list
mbed-tls(a)lists.trustedfirmware.org
https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls
Hi Gilles,
I noticed that the "double name" does still exist in some archive files:
$ wget -q -O - https://github.com/ARMmbed/mbedtls/archive/mbedtls-2.16.8.tar.gz|tar tzf -|head
mbedtls-mbedtls-2.16.8/
mbedtls-mbedtls-2.16.8/.github/
mbedtls-mbedtls-2.16.8/.github/issue_template.md
mbedtls-mbedtls-2.16.8/.github/pull_request_template.md
mbedtls-mbedtls-2.16.8/.gitignore
mbedtls-mbedtls-2.16.8/.globalrc
mbedtls-mbedtls-2.16.8/.pylintrc
mbedtls-mbedtls-2.16.8/.travis.yml
mbedtls-mbedtls-2.16.8/CMakeLists.txt
mbedtls-mbedtls-2.16.8/CONTRIBUTING.md
cheers,
Frank
On Tue, Aug 04, 2020 at 09:18:56PM +0000, Gilles Peskine via mbed-tls wrote:
[...]
> The naming with mbedtls-mbedtls- must be a bug in our release script.
[...]
--
Frank Bergmann, Pödinghauser Str. 5, D-32051 Herford, Tel. +49-5221-9249753
SAP Hybris & Linux LPIC-3, E-Mail tx2014(a)tuxad.de, USt-IdNr DE237314606
http://tdyn.de/freel -- Redirect to profile at freelancermap
http://www.gulp.de/freiberufler/2HNKY2YHW.html -- Profile at GULP
