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| author | Dimitri John Ledkov <dimitri.ledkov@canonical.com> | 2023-10-10 23:27:55 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-10-20 07:39:26 +0200 |
| commit | d4f5bfe20da9fa54024a73a9c60aea45e572d786 (patch) | |
| tree | a96f98c4ba9daf369dadce52be7f999fcde8c65e /certs | |
| parent | module: Do not offer sha224 for built-in module signing (diff) | |
| download | linux-d4f5bfe20da9fa54024a73a9c60aea45e572d786.tar.xz linux-d4f5bfe20da9fa54024a73a9c60aea45e572d786.zip | |
certs: Limit MODULE_SIG_KEY_TYPE_ECDSA to SHA384 or SHA512
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>
Diffstat (limited to 'certs')
| -rw-r--r-- | certs/Kconfig | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/certs/Kconfig b/certs/Kconfig index 1f109b070877..84582de66b7d 100644 --- a/certs/Kconfig +++ b/certs/Kconfig @@ -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. |