linux-kernel - [PATCH 5/6] crypto: enable automatic module signing with FIPS 202 SHA-3

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Date:   Sun, 22 Oct 2023 19:22:07 +0100
From:   Dimitri John Ledkov <dimitri.ledkov@...onical.com>
To:     herbert@...dor.apana.org.au, David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Luis Chamberlain <mcgrof@...nel.org>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org, linux-modules@...r.kernel.org
Subject: [PATCH 5/6] crypto: enable automatic module signing with FIPS 202 SHA-3

Add Kconfig options to use SHA-3 for kernel module signing. 256 size
for RSA only, and higher sizes for RSA and NIST P-384.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@...onical.com>
---
 certs/Kconfig         |  2 +-
 kernel/module/Kconfig | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/certs/Kconfig b/certs/Kconfig
index 84582de66b..69d192a32d 100644
--- a/certs/Kconfig
+++ b/certs/Kconfig
@@ -30,7 +30,7 @@ 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
+	depends on !(MODULE_SIG_SHA256 || MODULE_SIG_SHA3_256)
 	help
 	 Use an elliptic curve key (NIST P384) for module signing. Use
 	 a strong hash of same or higher bit length, i.e. sha384 or
diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig
index 9d7d45525f..0ea1b2970a 100644
--- a/kernel/module/Kconfig
+++ b/kernel/module/Kconfig
@@ -248,6 +248,18 @@ config MODULE_SIG_SHA512
 	bool "Sign modules with SHA-512"
 	select CRYPTO_SHA512
 
+config MODULE_SIG_SHA3_256
+	bool "Sign modules with SHA3-256"
+	select CRYPTO_SHA3
+
+config MODULE_SIG_SHA3_384
+	bool "Sign modules with SHA3-384"
+	select CRYPTO_SHA3
+
+config MODULE_SIG_SHA3_512
+	bool "Sign modules with SHA3-512"
+	select CRYPTO_SHA3
+
 endchoice
 
 config MODULE_SIG_HASH
@@ -256,6 +268,9 @@ config MODULE_SIG_HASH
 	default "sha256" if MODULE_SIG_SHA256
 	default "sha384" if MODULE_SIG_SHA384
 	default "sha512" if MODULE_SIG_SHA512
+	default "sha3-256" if MODULE_SIG_SHA3_256
+	default "sha3-384" if MODULE_SIG_SHA3_384
+	default "sha3-512" if MODULE_SIG_SHA3_512
 
 choice
 	prompt "Module compression mode"
-- 
2.34.1