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certs: Limit MODULE_SIG_KEY_TYPE_ECDSA to SHA384 or SHA512

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NIST FIPS 186-5 states that it is recommended that the security
strength associated with the bit length of n and the security strength
of the hash function be the same, or higher upon agreement. Given NIST
P384 curve is used, force using either SHA384 or SHA512.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Dimitri John Ledkov 2023-10-10 22:27:55 +01:00 committed by Herbert Xu
parent fc3225fd6f
commit d4f5bfe20d
1 changed files with 4 additions and 2 deletions
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6
certs/Kconfig
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@ -30,9 +30,11 @@ config MODULE_SIG_KEY_TYPE_RSA
config MODULE_SIG_KEY_TYPE_ECDSA
bool "ECDSA"
select CRYPTO_ECDSA
depends on MODULE_SIG_SHA384 || MODULE_SIG_SHA512
help
Use an elliptic curve key (NIST P384) for module signing. Consider
using a strong hash like sha256 or sha384 for hashing modules.
Use an elliptic curve key (NIST P384) for module signing. Use
a strong hash of same or higher bit length, i.e. sha384 or
sha512 for hashing modules.
Note: Remove all ECDSA signing keys, e.g. certs/signing_key.pem,
when falling back to building Linux 5.14 and older kernels.