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Add SLH-DSA support to PKCS#7/CMS SignedData (RFC 9814) #11720

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Add SLH-DSA support to PKCS#7/CMS SignedData (RFC 9814) #11720

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3ff4c89
Add SLH-DSA support to PKCS#7/CMS SignedData (RFC 9814)
ducanhmit Oct 12, 2026
1a546f8
PKCS#7 SLH-DSA: free partially initialised keys, reject sigAlg params
ducanhmit Nov 5, 2026
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Binary file added certs/slhdsa/cms-slhdsa-sha2-128s-noattr.der
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Binary file added certs/slhdsa/cms-slhdsa-shake-128s-sha224.der
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Binary file added certs/slhdsa/cms-slhdsa-shake-128s.der
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22 changes: 22 additions & 0 deletions certs/slhdsa/gen-slhdsa-mldsa-certs.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -243,5 +243,27 @@ check_result $? "Export ${BENCH} public key"
tail -c 32 "${BENCH}_pub.der" > "${BENCH}_pub.bin"
rm -f "${BENCH}_pub.der"

# RFC 9814 SignedData interop vectors, verified by
# pkcs7signed_slhdsa_interop_test() in wolfcrypt/test/test.c. One per hash
# family, covering both the signed-attributes and the no-signed-attributes
# form. OpenSSL picks the RFC 9814 digestAlgorithm for the parameter set.
printf 'RFC 9814 SLH-DSA SignedData from OpenSSL' > cms-content.tmp
openssl cms -sign -binary -nodetach -outform DER -in cms-content.tmp \
-signer root-slhdsa-shake-128s.pem -inkey root-slhdsa-shake-128s-priv.pem \
-out cms-slhdsa-shake-128s.der
check_result $? "Sign SLH-DSA-SHAKE-128s SignedData"
openssl cms -sign -binary -nodetach -noattr -outform DER -in cms-content.tmp \
-signer root-slhdsa-sha2-128s.pem -inkey root-slhdsa-sha2-128s-priv.pem \
-out cms-slhdsa-sha2-128s-noattr.der
check_result $? "Sign SLH-DSA-SHA2-128s SignedData without attributes"
# Negative vector: SHA-224 is shorter than RFC 9814 allows for 128-bit
# parameter sets when signed attributes are present. Must fail to verify.
openssl cms -sign -binary -nodetach -md sha224 -outform DER \
-in cms-content.tmp -signer root-slhdsa-shake-128s.pem \
-inkey root-slhdsa-shake-128s-priv.pem \
-out cms-slhdsa-shake-128s-sha224.der
check_result $? "Sign SLH-DSA-SHAKE-128s SignedData with SHA-224"
rm -f cms-content.tmp

echo
echo "All SLH-DSA / ML-DSA-44 test certificates regenerated."
3 changes: 3 additions & 0 deletions certs/slhdsa/include.am
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Expand Up @@ -28,6 +28,9 @@ EXTRA_DIST += \
certs/slhdsa/root-slhdsa-sha2-128s-priv.der \
certs/slhdsa/root-slhdsa-sha2-128s.pem \
certs/slhdsa/root-slhdsa-sha2-128s.der \
certs/slhdsa/cms-slhdsa-shake-128s.der \
certs/slhdsa/cms-slhdsa-shake-128s-sha224.der \
certs/slhdsa/cms-slhdsa-sha2-128s-noattr.der \
certs/slhdsa/server-mldsa44-sha2.pem \
certs/slhdsa/client-mldsa44-sha2.pem \
certs/slhdsa/server-slhdsa-shake-128f-priv.pem \
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