Some improvements #699

sjaeckel · 2025-10-03T09:22:31Z

I've reordered and refactored some of the commits of #697 in order to limit its scope and simplify the merge and a potential faster release of 2.0

With these changes merged I currently don't see any planned ABI or API breakage (besides #515, but that's an entirely different discussion).

This should be the last PR with intentional changes before a v2.0.0-rc1, c.f. #568

karel-m · 2025-10-03T10:14:02Z

I have just quickly changed the libtomcrypt in my CryptX perl bindings for the branch "some-improvements" from this PR.

It failed to build (which is probably expected) https://github.com/DCIT/perl-CryptX/actions/runs/18219248768/job/51875345151

I will try to adopt CryptX to the new changes (after that we will see whether CryptX test suite reveals something).

sjaeckel · 2025-10-03T13:45:30Z

I have just quickly changed the libtomcrypt in my CryptX perl bindings for the branch "some-improvements" from this PR.

Cool, thanks!

It failed to build (which is probably expected) https://github.com/DCIT/perl-CryptX/actions/runs/18219248768/job/51875345151

If I'm not mistaken there are two errors

[148] ff. is already caused by #524

[187] ff. is indeed caused by the API change of rsa_verify_hash_ex() in this PR

Both are expected, so thanks already in advance for fixing this in CryptX and testing those changes ☺️

[148] https://github.com/DCIT/perl-CryptX/actions/runs/18219248768/job/51875345151#step:7:149
[187] https://github.com/DCIT/perl-CryptX/actions/runs/18219248768/job/51875345151#step:7:188

karel-m · 2025-10-05T16:52:37Z

I have updated my perl bindings and it seems to work fine.

Just one minor suggestion: please add @param mgf_hash_idx ..... to description of rsa_sign_hash_ex + rsa_verify_hash_ex

Signed-off-by: Steffen Jaeckel <[email protected]>

To be able to do a bit more, add an optional handler callback function. Additional to that, also make it possible to mark elements as optional. Signed-off-by: Steffen Jaeckel <[email protected]>

(and you should do that too) Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

Update PKCS#1-PSS and RSA APIs that allow passing a separate hash index for the MGF1 hash. Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

Slightly minimize both space and time when importing a SubjectPublicKeyInfo. Time for ECC keys stays the same. Those tests were done with X.509 support already available, but later these commits were split up to be independent of the X.509 feature. Running the entire set of pem files through `x509_verify` via [0] resp. the timing app via [1] resulted in the following data: Before this patch: [0] ``` ==1031519== HEAP SUMMARY: ==1031519== in use at exit: 0 bytes in 0 blocks ==1031519== total heap usage: 424,057 allocs, 424,057 frees, 73,527,730 bytes allocated ``` [1] ``` x509 cert-rsa-pss.pem : 50021 cycles x509 LTC_CA.pem : 10335 cycles x509 LTC_S0.pem : 47284 cycles x509 LTC_SS0.pem : 36687 cycles x509 secp384r1.pem : 1985416 cycles x509 secp521r1.pem : 3287773 cycles x509 LTC_SSS0.pem : 25086 cycles x509 secp224r1.pem : 775807 cycles ``` After this patch: [0] ``` ==1043548== HEAP SUMMARY: ==1043548== in use at exit: 0 bytes in 0 blocks ==1043548== total heap usage: 337,244 allocs, 337,244 frees, 65,047,463 bytes allocated ``` [1] ``` x509 cert-rsa-pss.pem : 32568 cycles x509 LTC_CA.pem : 5478 cycles x509 LTC_S0.pem : 36093 cycles x509 LTC_SS0.pem : 23351 cycles x509 secp384r1.pem : 1984030 cycles x509 secp521r1.pem : 3303396 cycles x509 LTC_SSS0.pem : 13220 cycles x509 secp224r1.pem : 781534 cycles ``` [0] find tests/x509 -name '*.pem' -exec valgrind --leak-check=full --show-leak-kinds=all './x509_verify' {} \+ [1] ./timing x509 Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

... in order of likelihood of usage and/or strength. Signed-off-by: Steffen Jaeckel <[email protected]>

Only go once through `X_descriptor[]` when calling `register_X()` Signed-off-by: Steffen Jaeckel <[email protected]>

Before this patch it silently didn't work, now it errors out. Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

karel-m · 2025-10-17T10:27:02Z

FYI current branch some-improvements seems to fail on arm and cywin (will investigate later)

* The oldest supported Ubuntu Version is 22.04 which comes with CMake 3.22. * Refactor demos/CMakeLists.txt to set the list of binaries only once. Signed-off-by: Steffen Jaeckel <[email protected]>

This reverts commit 93f5348. You should use the CMake flag `-DCMAKE_CXX_COMPILER_LAUNCHER=ccache` instead. Sibling-to: libtom/libtommath#577 Signed-off-by: Steffen Jaeckel <[email protected]>

This closes #354 Signed-off-by: Steffen Jaeckel <[email protected]>

Change the default behavior of `LTC_ARGCHK()` for Release, resp. Release+Shared Library builds to be non-fatal. This closes #458 Signed-off-by: Steffen Jaeckel <[email protected]>

Fixes #700 Signed-off-by: Steffen Jaeckel <[email protected]>

One can now define them on a per-case basis to disable them. Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

karel-m · 2025-10-17T12:34:12Z

FYI current branch some-improvements seems to fail on arm and cywin (will investigate later)

it is a segfault (memory corruption) related to ecc_sign_hash_v2 (still not sure if in libtomcrypt or in C code of my perl bindings)

sjaeckel · 2025-10-17T16:14:22Z

FYI current branch some-improvements seems to fail on arm and cywin (will investigate later)

it is a segfault (memory corruption) related to ecc_sign_hash_v2 (still not sure if in libtomcrypt or in C code of my perl bindings)

hmm

$ ./test ecc
[...]
SUCCESS: passed=1 failed=0 nop=0 duration=41.5sec real=41.5sec
$ file test                                              
test: ELF 64-bit LSB executable, ARM aarch64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=8aab34cfb2c11a97baefcf2787a078587a6795ea, for GNU/Linux 4.3.0, with debug_info, not stripped

At least the tests can't reproduce it for AARCH64 with Qemu ...

karel-m · 2025-10-17T16:51:40Z

on cywin it fails inside ecc_rfc6979_key in the first hmac_memory_multi (which is strange)

karel-m · 2025-10-17T17:08:31Z

The fix DCIT/perl-CryptX@cccc52b

now passes tests also on cygwin + arm

It expects a pair of type `(unsigned char*,unsigned long)` and not `(unsigned char*,unsigned int)`. Fixes: 46fa363 ("Finish up RFC6979 ECDSA keygen") Reported-via: #699 (comment) ff. Signed-off-by: Steffen Jaeckel <[email protected]>

sjaeckel · 2025-10-20T15:49:00Z

The fix DCIT/perl-CryptX@cccc52b

Thanks for triaging it and proposing the fix. Seeing it like that it's obvious now ...

now passes tests also on cygwin + arm

The last patch should be an equivalent solution to your proposed fix, could you please check again?

karel-m · 2025-10-20T17:41:40Z

The last patch should be an equivalent solution to your proposed fix, could you please check again?

checked, it is good

This also: a) deprecates the old RSA and PKCS#1 API. b) reverts the changes done to them in order to make them API compatible again with the last release. The fixes commit mentioned is the testcase for the Bleichenbacher attack, which works now again as expected. Fixes: 9d03c38 ("add flags to `der_decode_sequence()`") Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

``` src/ciphers/aes/aesni.c:150:7: warning: Value stored to 'temp' is never read [deadcode.DeadStores] 150 | temp = temp_invert(rk); | ^ ~~~~~~~~~~~~~~~ 1 warning generated. ``` Signed-off-by: Steffen Jaeckel <[email protected]>

This can be disabled by defining `LTC_NO_AES_NI`. Signed-off-by: Steffen Jaeckel <[email protected]>

Fixes: fe8e4bf ("Use more builtin functions if available") Signed-off-by: Steffen Jaeckel <[email protected]>

With `LTC_FAST` enabled test to read from different offsets. Signed-off-by: Steffen Jaeckel <[email protected]>

Signed-off-by: Steffen Jaeckel <[email protected]>

sjaeckel

If you're fine with those latest changes [0] I'll add the same macro trickery for the deprecated RSA APIs as well, properly deprecate all the remaining APIS, and then we'll only have to update the docs...

[0] https://github.com/libtom/libtomcrypt/pull/699/files/baf71ad0544d1b1f03b5b644203b6afbe43b9feb..b78da6e65607c23f852ce78583e90025cd2817d9

sjaeckel · 2025-10-23T08:47:44Z

src/headers/tomcrypt_pk.h

Any comments on the new RSA API?

sjaeckel · 2025-10-23T08:50:08Z

src/headers/tomcrypt_pk.h

+               unsigned long  lparamlen;
+      } crypt;
+      /* let's make space for potential future extensions */
+      ulong64 dummy[8];


This would allow us to extend functionality without breaking API&ABI in the future.

Is this really necessary for RSA?

Should some ECC struct get something like that?

sjaeckel · 2025-10-23T08:51:58Z

src/headers/tomcrypt_pkcs.h

I've searched through GH and couldn't find anyone using those APIs, so I thought we can simply remove them resp. make them private. People can still speak up and the deprecation can be reverted in the future.

Fine like that?

sjaeckel added this to the next milestone Oct 3, 2025

sjaeckel requested review from karel-m and levitte October 3, 2025 09:22

sjaeckel force-pushed the some-improvements branch 2 times, most recently from 24f8a2f to 787e5c1 Compare October 3, 2025 13:39

sjaeckel linked an issue Oct 6, 2025 that may be closed by this pull request

On documentation: Add list of all supported ciphers, modes, hash algorithms, curves and so on #349

Open

2 tasks

sjaeckel force-pushed the some-improvements branch 2 times, most recently from 5b5fec8 to c760347 Compare October 16, 2025 08:31

sjaeckel mentioned this pull request Oct 16, 2025

rfc6979_hash_alg question #700

Open

sjaeckel linked an issue Oct 16, 2025 that may be closed by this pull request

rfc6979_hash_alg question #700

Open

sjaeckel added 17 commits October 16, 2025 12:29

Extract static function as x509_get_pka()

c7f8dd8

Signed-off-by: Steffen Jaeckel <[email protected]>

Export static function as x509_import_spki()

71b89e8

Signed-off-by: Steffen Jaeckel <[email protected]>

Re-factor s_import_pkcs8()

5c534cc

Signed-off-by: Steffen Jaeckel <[email protected]>

Extend der_flexi_sequence_cmp()

79b0a72

To be able to do a bit more, add an optional handler callback function. Additional to that, also make it possible to mark elements as optional. Signed-off-by: Steffen Jaeckel <[email protected]>

Use rsa_init() to initialize an rsa_key

575f064

(and you should do that too) Signed-off-by: Steffen Jaeckel <[email protected]>

Add demos/der_print_flexi.c

10c1e13

Signed-off-by: Steffen Jaeckel <[email protected]>

Add support for separate MGF1 hashes

f759c76

Update PKCS#1-PSS and RSA APIs that allow passing a separate hash index for the MGF1 hash. Signed-off-by: Steffen Jaeckel <[email protected]>

Add support for RSA-PSS keys

7dd6229

Signed-off-by: Steffen Jaeckel <[email protected]>

A BitString of length 0 can be only 3bytes long

6c54b88

Signed-off-by: Steffen Jaeckel <[email protected]>

Add SubjectPublicKeyInfo support to dsa_import()

aeec5ea

Signed-off-by: Steffen Jaeckel <[email protected]>

Put realloc logic into pem_read()

1f62f4b

Signed-off-by: Steffen Jaeckel <[email protected]>

Re-order hash registrations

9a1c288

... in order of likelihood of usage and/or strength. Signed-off-by: Steffen Jaeckel <[email protected]>

Improve register_{cipher,hash,prng}()

9b5e03b

Only go once through `X_descriptor[]` when calling `register_X()` Signed-off-by: Steffen Jaeckel <[email protected]>

Fix curve25519 in case sha512 is not available

95f74f3

Before this patch it silently didn't work, now it errors out. Signed-off-by: Steffen Jaeckel <[email protected]>

Re-order PEM headers to prepare for X.509 APIs

5074e36

Signed-off-by: Steffen Jaeckel <[email protected]>

Don't use written parameter of macro directly

82c795e

Signed-off-by: Steffen Jaeckel <[email protected]>

sjaeckel and others added 7 commits October 17, 2025 13:29

Bump required CMake version & DRY

9226671

* The oldest supported Ubuntu Version is 22.04 which comes with CMake 3.22. * Refactor demos/CMakeLists.txt to set the list of binaries only once. Signed-off-by: Steffen Jaeckel <[email protected]>

Revert "cmake: add ccache support"

01f35ae

This reverts commit 93f5348. You should use the CMake flag `-DCMAKE_CXX_COMPILER_LAUNCHER=ccache` instead. Sibling-to: libtom/libtommath#577 Signed-off-by: Steffen Jaeckel <[email protected]>

Clarify MPI providers a bit further

8c477da

This closes #354 Signed-off-by: Steffen Jaeckel <[email protected]>

Don't abort() in "release" builds

1b476a9

Change the default behavior of `LTC_ARGCHK()` for Release, resp. Release+Shared Library builds to be non-fatal. This closes #458 Signed-off-by: Steffen Jaeckel <[email protected]>

Make build of docs reproducible

4c6f234

Move RFC6979 hash alg to a new ecc signature options struct

b7ac3af

Fixes #700 Signed-off-by: Steffen Jaeckel <[email protected]>

Allow deprecation warnings to be disabled

00dbd41

One can now define them on a per-case basis to disable them. Signed-off-by: Steffen Jaeckel <[email protected]>

sjaeckel force-pushed the some-improvements branch from 7ff585a to 3f05dbf Compare October 17, 2025 11:29

sjaeckel added 2 commits October 17, 2025 13:32

Add tests for deprecated APIs

660332b

Signed-off-by: Steffen Jaeckel <[email protected]>

Update makefiles

747b9c1

sjaeckel force-pushed the some-improvements branch from 3f05dbf to 747b9c1 Compare October 17, 2025 11:32

Fix hmac_memory_multi() invocation

baf71ad

It expects a pair of type `(unsigned char*,unsigned long)` and not `(unsigned char*,unsigned int)`. Fixes: 46fa363 ("Finish up RFC6979 ECDSA keygen") Reported-via: #699 (comment) ff. Signed-off-by: Steffen Jaeckel <[email protected]>

sjaeckel force-pushed the some-improvements branch from 4e9ce08 to 4ed864a Compare October 23, 2025 08:11

sjaeckel added 7 commits October 23, 2025 10:31

Suppress deprecated warnings for now

0bcd591

Signed-off-by: Steffen Jaeckel <[email protected]>

Minor fixes

3fdb763

Signed-off-by: Steffen Jaeckel <[email protected]>

Fix warning uncovered by scan-build.

f4ab520

``` src/ciphers/aes/aesni.c:150:7: warning: Value stored to 'temp' is never read [deadcode.DeadStores] 150 | temp = temp_invert(rk); | ^ ~~~~~~~~~~~~~~~ 1 warning generated. ``` Signed-off-by: Steffen Jaeckel <[email protected]>

Enable AES-NI per default on x86_64.

bfa1da4

This can be disabled by defining `LTC_NO_AES_NI`. Signed-off-by: Steffen Jaeckel <[email protected]>

Allow disabling of CLZL and CTZL builtins.

ddd8fd0

Fixes: fe8e4bf ("Use more builtin functions if available") Signed-off-by: Steffen Jaeckel <[email protected]>

Make store_test() a bit more aggressive.

d88915c

With `LTC_FAST` enabled test to read from different offsets. Signed-off-by: Steffen Jaeckel <[email protected]>

Use LTC_TMPVAR() in more Macros.

b78da6e

Signed-off-by: Steffen Jaeckel <[email protected]>

sjaeckel force-pushed the some-improvements branch from 4ed864a to b78da6e Compare October 23, 2025 08:31

sjaeckel commented Oct 23, 2025

View reviewed changes

Some improvements #699

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