WIP: swtpm_cert: Enable CAs with ML-DSA key to sign a certifcate#1064
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WIP: swtpm_cert: Enable CAs with ML-DSA key to sign a certifcate#1064stefanberger wants to merge 1 commit intomasterfrom
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Test for GNUTLS_PK_MLDSA44 to detect whether GnuTLS supports ML-DSA. Only SHAKE-256 can be used for hashing when ML-DSA is used for signing: https://github.com/gnutls/gnutls/blob/df24a53136f188d77aaffe66316b0fb6ba720d40/lib/algorithms/sign.c#L405-L428 The problem is that the size of NVRAM indices is limited to MAX_NV_INDEX_SIZE = 2048, which is too small for a certificate created with ML-DSA: ML-DSA-44: ~2757 bytes ML-DSA-87: ~4964 bytes Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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Writing the larger certificates into NVRAM indices will only work with
Other choice: Wait for Falcon PQC signature algorithm since it has smaller signature sizes and hopefully EK and platform certificates that fit into existing 2048 bytes. |
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Test for GNUTLS_PK_MLDSA44 to detect whether GnuTLS supports ML-DSA.
Only SHAKE-256 can be used for hashing when ML-DSA is used for signing:
https://github.com/gnutls/gnutls/blob/df24a53136f188d77aaffe66316b0fb6ba720d40/lib/algorithms/sign.c#L405-L428
The problem is now that the size of NVRAM indices is limited to MAX_NV_INDEX_SIZE = 2048, which is too small for a certificate created even with ML-DSA-44, which is around 2757 bytes long.