Luca Boccassi
3fb520f010
RSA PKCS#1 v1.5 is vulnerable to Bleichenbacher-style padding oracle attacks, albeit very difficult and unlikely to actually happen in the real world. Still for hardedning, switch new enrollments to RSA-OAEP, with SHA-256 preferred and SHA-1 as fallback (probed at enrollment time, since e.g. SoftHSM only accepts SHA-1, and older token might as well). The actual padding scheme used to wrap a given key is recorded as a new optional 'pkcs11-padding' / 'padding' field in the LUKS2 token JSON and the homed user record. Decryption defaults to PKCS#1 v1.5 when absent so existing enrollments keep working.
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