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Add bitflip test for trivial SUF-CMA forgeries #2090

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Add bitflip test for trivial SUF-CMA forgeries #2090

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56e6ab1
add bitflip test to test_sig.c
rtjk Feb 27, 2025
fb8835c
format code
rtjk Feb 27, 2025
c0daec5
- add sig->suf_cma
rtjk Mar 3, 2025
e937e3b
%d to %ld for size_t bitflips
rtjk Mar 4, 2025
af9ceb9
cast argument bitflips to size_t
rtjk Mar 4, 2025
3e5c647
replace atoi() with strtol()
rtjk Mar 4, 2025
b0e32ba
cast bit_index to %llu
rtjk Mar 4, 2025
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38 changes: 19 additions & 19 deletions docs/algorithms/sig/cross.md
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Expand Up @@ -7,32 +7,32 @@
- **Authors' website**: https://www.cross-crypto.com/
- **Specification version**: 2.0 + PQClean and OQS patches.
- **Primary Source**<a name="primary-source"></a>:
- **Source**: https://github.com/CROSS-signature/CROSS-lib-oqs/commit/efd17279e75308b000bda7c7f58866620d652bc1
- **Source**: https://github.com/CROSS-signature/CROSS-lib-oqs/commit/01f2486523f352a7eb1809a246c8fe466772642c
- **Implementation license (SPDX-Identifier)**: CC0-1.0


## Parameter set summary

| Parameter set | Parameter set alias | Security model | Claimed NIST Level | Public key size (bytes) | Secret key size (bytes) | Signature size (bytes) |
|:------------------------:|:----------------------|:-----------------|---------------------:|--------------------------:|--------------------------:|-------------------------:|
| cross-rsdp-128-balanced | NA | EUF-CMA | 1 | 77 | 32 | 13152 |
| cross-rsdp-128-fast | NA | EUF-CMA | 1 | 77 | 32 | 18432 |
| cross-rsdp-128-small | NA | EUF-CMA | 1 | 77 | 32 | 12432 |
| cross-rsdp-192-balanced | NA | EUF-CMA | 3 | 115 | 48 | 29853 |
| cross-rsdp-192-fast | NA | EUF-CMA | 3 | 115 | 48 | 41406 |
| cross-rsdp-192-small | NA | EUF-CMA | 3 | 115 | 48 | 28391 |
| cross-rsdp-256-balanced | NA | EUF-CMA | 5 | 153 | 64 | 53527 |
| cross-rsdp-256-fast | NA | EUF-CMA | 5 | 153 | 64 | 74590 |
| cross-rsdp-256-small | NA | EUF-CMA | 5 | 153 | 64 | 50818 |
| cross-rsdpg-128-balanced | NA | EUF-CMA | 1 | 54 | 32 | 9120 |
| cross-rsdpg-128-fast | NA | EUF-CMA | 1 | 54 | 32 | 11980 |
| cross-rsdpg-128-small | NA | EUF-CMA | 1 | 54 | 32 | 8960 |
| cross-rsdpg-192-balanced | NA | EUF-CMA | 3 | 83 | 48 | 22464 |
| cross-rsdpg-192-fast | NA | EUF-CMA | 3 | 83 | 48 | 26772 |
| cross-rsdpg-192-small | NA | EUF-CMA | 3 | 83 | 48 | 20452 |
| cross-rsdpg-256-balanced | NA | EUF-CMA | 5 | 106 | 64 | 40100 |
| cross-rsdpg-256-fast | NA | EUF-CMA | 5 | 106 | 64 | 48102 |
| cross-rsdpg-256-small | NA | EUF-CMA | 5 | 106 | 64 | 36454 |
| cross-rsdp-128-balanced | NA | SUF-CMA | 1 | 77 | 32 | 13152 |
| cross-rsdp-128-fast | NA | SUF-CMA | 1 | 77 | 32 | 18432 |
| cross-rsdp-128-small | NA | SUF-CMA | 1 | 77 | 32 | 12432 |
| cross-rsdp-192-balanced | NA | SUF-CMA | 3 | 115 | 48 | 29853 |
| cross-rsdp-192-fast | NA | SUF-CMA | 3 | 115 | 48 | 41406 |
| cross-rsdp-192-small | NA | SUF-CMA | 3 | 115 | 48 | 28391 |
| cross-rsdp-256-balanced | NA | SUF-CMA | 5 | 153 | 64 | 53527 |
| cross-rsdp-256-fast | NA | SUF-CMA | 5 | 153 | 64 | 74590 |
| cross-rsdp-256-small | NA | SUF-CMA | 5 | 153 | 64 | 50818 |
| cross-rsdpg-128-balanced | NA | SUF-CMA | 1 | 54 | 32 | 9120 |
| cross-rsdpg-128-fast | NA | SUF-CMA | 1 | 54 | 32 | 11980 |
| cross-rsdpg-128-small | NA | SUF-CMA | 1 | 54 | 32 | 8960 |
| cross-rsdpg-192-balanced | NA | SUF-CMA | 3 | 83 | 48 | 22464 |
| cross-rsdpg-192-fast | NA | SUF-CMA | 3 | 83 | 48 | 26772 |
| cross-rsdpg-192-small | NA | SUF-CMA | 3 | 83 | 48 | 20452 |
| cross-rsdpg-256-balanced | NA | SUF-CMA | 5 | 106 | 64 | 40100 |
| cross-rsdpg-256-fast | NA | SUF-CMA | 5 | 106 | 64 | 48102 |
| cross-rsdpg-256-small | NA | SUF-CMA | 5 | 106 | 64 | 36454 |

## cross-rsdp-128-balanced implementation characteristics

Expand Down
38 changes: 19 additions & 19 deletions docs/algorithms/sig/cross.yml
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Expand Up @@ -23,13 +23,13 @@ website: https://www.cross-crypto.com/
nist-round: 2
spec-version: 2.0 + PQClean and OQS patches
primary-upstream:
source: https://github.com/CROSS-signature/CROSS-lib-oqs/commit/efd17279e75308b000bda7c7f58866620d652bc1
source: https://github.com/CROSS-signature/CROSS-lib-oqs/commit/01f2486523f352a7eb1809a246c8fe466772642c
spdx-license-identifier: CC0-1.0
parameter-sets:
- name: cross-rsdp-128-balanced
oqs_alg: OQS_SIG_alg_cross_rsdp_128_balanced
claimed-nist-level: 1
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 77
length-secret-key: 32
length-signature: 13152
Expand Down Expand Up @@ -57,7 +57,7 @@ parameter-sets:
- name: cross-rsdp-128-fast
oqs_alg: OQS_SIG_alg_cross_rsdp_128_fast
claimed-nist-level: 1
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 77
length-secret-key: 32
length-signature: 18432
Expand Down Expand Up @@ -85,7 +85,7 @@ parameter-sets:
- name: cross-rsdp-128-small
oqs_alg: OQS_SIG_alg_cross_rsdp_128_small
claimed-nist-level: 1
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 77
length-secret-key: 32
length-signature: 12432
Expand Down Expand Up @@ -113,7 +113,7 @@ parameter-sets:
- name: cross-rsdp-192-balanced
oqs_alg: OQS_SIG_alg_cross_rsdp_192_balanced
claimed-nist-level: 3
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 115
length-secret-key: 48
length-signature: 29853
Expand Down Expand Up @@ -141,7 +141,7 @@ parameter-sets:
- name: cross-rsdp-192-fast
oqs_alg: OQS_SIG_alg_cross_rsdp_192_fast
claimed-nist-level: 3
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 115
length-secret-key: 48
length-signature: 41406
Expand Down Expand Up @@ -169,7 +169,7 @@ parameter-sets:
- name: cross-rsdp-192-small
oqs_alg: OQS_SIG_alg_cross_rsdp_192_small
claimed-nist-level: 3
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 115
length-secret-key: 48
length-signature: 28391
Expand Down Expand Up @@ -197,7 +197,7 @@ parameter-sets:
- name: cross-rsdp-256-balanced
oqs_alg: OQS_SIG_alg_cross_rsdp_256_balanced
claimed-nist-level: 5
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 153
length-secret-key: 64
length-signature: 53527
Expand Down Expand Up @@ -225,7 +225,7 @@ parameter-sets:
- name: cross-rsdp-256-fast
oqs_alg: OQS_SIG_alg_cross_rsdp_256_fast
claimed-nist-level: 5
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 153
length-secret-key: 64
length-signature: 74590
Expand Down Expand Up @@ -253,7 +253,7 @@ parameter-sets:
- name: cross-rsdp-256-small
oqs_alg: OQS_SIG_alg_cross_rsdp_256_small
claimed-nist-level: 5
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 153
length-secret-key: 64
length-signature: 50818
Expand Down Expand Up @@ -281,7 +281,7 @@ parameter-sets:
- name: cross-rsdpg-128-balanced
oqs_alg: OQS_SIG_alg_cross_rsdpg_128_balanced
claimed-nist-level: 1
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 54
length-secret-key: 32
length-signature: 9120
Expand Down Expand Up @@ -309,7 +309,7 @@ parameter-sets:
- name: cross-rsdpg-128-fast
oqs_alg: OQS_SIG_alg_cross_rsdpg_128_fast
claimed-nist-level: 1
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 54
length-secret-key: 32
length-signature: 11980
Expand Down Expand Up @@ -337,7 +337,7 @@ parameter-sets:
- name: cross-rsdpg-128-small
oqs_alg: OQS_SIG_alg_cross_rsdpg_128_small
claimed-nist-level: 1
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 54
length-secret-key: 32
length-signature: 8960
Expand Down Expand Up @@ -365,7 +365,7 @@ parameter-sets:
- name: cross-rsdpg-192-balanced
oqs_alg: OQS_SIG_alg_cross_rsdpg_192_balanced
claimed-nist-level: 3
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 83
length-secret-key: 48
length-signature: 22464
Expand Down Expand Up @@ -393,7 +393,7 @@ parameter-sets:
- name: cross-rsdpg-192-fast
oqs_alg: OQS_SIG_alg_cross_rsdpg_192_fast
claimed-nist-level: 3
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 83
length-secret-key: 48
length-signature: 26772
Expand Down Expand Up @@ -421,7 +421,7 @@ parameter-sets:
- name: cross-rsdpg-192-small
oqs_alg: OQS_SIG_alg_cross_rsdpg_192_small
claimed-nist-level: 3
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 83
length-secret-key: 48
length-signature: 20452
Expand Down Expand Up @@ -449,7 +449,7 @@ parameter-sets:
- name: cross-rsdpg-256-balanced
oqs_alg: OQS_SIG_alg_cross_rsdpg_256_balanced
claimed-nist-level: 5
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 106
length-secret-key: 64
length-signature: 40100
Expand Down Expand Up @@ -477,7 +477,7 @@ parameter-sets:
- name: cross-rsdpg-256-fast
oqs_alg: OQS_SIG_alg_cross_rsdpg_256_fast
claimed-nist-level: 5
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 106
length-secret-key: 64
length-signature: 48102
Expand Down Expand Up @@ -505,7 +505,7 @@ parameter-sets:
- name: cross-rsdpg-256-small
oqs_alg: OQS_SIG_alg_cross_rsdpg_256_small
claimed-nist-level: 5
claimed-security: EUF-CMA
claimed-security: SUF-CMA
length-public-key: 106
length-secret-key: 64
length-signature: 36454
Expand Down
5 changes: 5 additions & 0 deletions scripts/copy_from_upstream/copy_from_upstream.py
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Expand Up @@ -368,7 +368,12 @@ def load_instructions(file='copy_from_upstream.yml'):
raise RuntimeError("Found duplicate arch {} in scheme {}".format(arch, scheme))
scheme['scheme_paths'][arch] = (os.path.join('repos', location,
upstreams[location]['sig_scheme_path'].format_map(scheme)))
# assume EUF-CMA for schemes that don't specify a security classification
scheme['metadata']['euf_cma'] = 'true'
scheme['metadata']['suf_cma'] = 'false'
if 'claimed-security' in metadata:
if metadata['claimed-security'] == "SUF-CMA":
scheme['metadata']['suf_cma'] = 'true'
Comment on lines +371 to +376
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@rtjk rtjk Mar 4, 2025 •
edited
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Here's a recap of the claimed security of signature schemes as of now:
-ML-DSA is declared as SUF-CMA in the liboqs docs, but not in the upstream META.yml
-CROSS is declared as SUF-CMA both in the docs and in META.yml
-all other signatures are declared as EUF-CMA in the docs, but make no claim in META.yml
-stateful signatures don't report any claimed-security

From here, I think it should be clarified who has the ultimate responsibility for making the security claim: the liboqs docs or the upstream repo? The latter seems preferable, as it is what is done for KEMs.

If we choose the liboqs docs instead, then it would be necessary to edit sig->suf_cma based on the documentation (e.g., the claimed-security field in docs/algorithms/sig/ml_dsa.yml).

Also, is it okay to assume EUF-CMA for imported schemes? This was the previous behavior, which I have kept.

Finally, how should we treat stateful signatures? Should I add the bitflip test there too?

scheme['pqclean_scheme_c'] = scheme['pqclean_scheme'].replace('-', '')
scheme['scheme_c'] = scheme['scheme'].replace('-', '')
scheme['default_implementation'] = family['default_implementation']
Expand Down
2 changes: 1 addition & 1 deletion scripts/copy_from_upstream/copy_from_upstream.yml
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Expand Up @@ -75,7 +75,7 @@ upstreams:
name: upcross
git_url: https://github.com/CROSS-signature/CROSS-lib-oqs.git
git_branch: master
git_commit: efd17279e75308b000bda7c7f58866620d652bc1
git_commit: 01f2486523f352a7eb1809a246c8fe466772642c
sig_meta_path: 'generate/crypto_sign/{pqclean_scheme}/META.yml'
sig_scheme_path: 'generate/crypto_sign/{pqclean_scheme}'
kems:
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2 changes: 2 additions & 0 deletions scripts/copy_from_upstream/src/sig/family/sig_scheme.c
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Expand Up @@ -21,6 +21,7 @@ OQS_SIG *OQS_SIG_{{ family }}_{{ scheme['scheme'] }}_new(void) {

sig->claimed_nist_level = {{ scheme['metadata']['claimed-nist-level'] }};
sig->euf_cma = {{ scheme['metadata']['euf_cma'] }};
sig->suf_cma = {{ scheme['metadata']['suf_cma'] }};
{%- if 'api-with-context-string' in default_impl and default_impl['api-with-context-string'] %}
sig->sig_with_ctx_support = true;
{%- else %}
Expand Down Expand Up @@ -58,6 +59,7 @@ OQS_SIG *OQS_SIG_{{ family }}_{{ scheme['alias_scheme'] }}_new(void) {

sig->claimed_nist_level = {{ scheme['metadata']['claimed-nist-level'] }};
sig->euf_cma = {{ scheme['metadata']['euf_cma'] }};
sig->suf_cma = {{ scheme['metadata']['suf_cma'] }};

sig->length_public_key = OQS_SIG_{{ family }}_{{ scheme['scheme'] }}_length_public_key;
sig->length_secret_key = OQS_SIG_{{ family }}_{{ scheme['scheme'] }}_length_secret_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_128_balanced.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_128_balanced_new(void) {

sig->claimed_nist_level = 1;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_128_balanced_length_public_key;
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1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_128_fast.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_128_fast_new(void) {

sig->claimed_nist_level = 1;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_128_fast_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_128_small.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_128_small_new(void) {

sig->claimed_nist_level = 1;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_128_small_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_192_balanced.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_192_balanced_new(void) {

sig->claimed_nist_level = 3;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_192_balanced_length_public_key;
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1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_192_fast.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_192_fast_new(void) {

sig->claimed_nist_level = 3;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_192_fast_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_192_small.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_192_small_new(void) {

sig->claimed_nist_level = 3;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_192_small_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_256_balanced.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_256_balanced_new(void) {

sig->claimed_nist_level = 5;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_256_balanced_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_256_fast.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_256_fast_new(void) {

sig->claimed_nist_level = 5;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_256_fast_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdp_256_small.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdp_256_small_new(void) {

sig->claimed_nist_level = 5;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdp_256_small_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_128_balanced.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_128_balanced_new(void) {

sig->claimed_nist_level = 1;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_128_balanced_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_128_fast.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_128_fast_new(void) {

sig->claimed_nist_level = 1;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_128_fast_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_128_small.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_128_small_new(void) {

sig->claimed_nist_level = 1;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_128_small_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_192_balanced.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_192_balanced_new(void) {

sig->claimed_nist_level = 3;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_192_balanced_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_192_fast.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_192_fast_new(void) {

sig->claimed_nist_level = 3;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_192_fast_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_192_small.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_192_small_new(void) {

sig->claimed_nist_level = 3;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_192_small_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_256_balanced.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_256_balanced_new(void) {

sig->claimed_nist_level = 5;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_256_balanced_length_public_key;
Expand Down
1 change: 1 addition & 0 deletions src/sig/cross/sig_cross_rsdpg_256_fast.c
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Expand Up @@ -16,6 +16,7 @@ OQS_SIG *OQS_SIG_cross_rsdpg_256_fast_new(void) {

sig->claimed_nist_level = 5;
sig->euf_cma = true;
sig->suf_cma = true;
sig->sig_with_ctx_support = false;

sig->length_public_key = OQS_SIG_cross_rsdpg_256_fast_length_public_key;
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