linux-kernel - [PATCH v2 1/2] crypto: x86/aesni

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Date: Fri, 22 Mar 2024 16:04:58 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org
Cc: herbert@...dor.apana.org.au,
	davem@...emloft.net,
	ebiggers@...nel.org,
	ardb@...nel.org,
	x86@...nel.org,
	chang.seok.bae@...el.com
Subject: [PATCH v2 1/2] crypto: x86/aesni - Rearrange AES key size check

aes_expandkey() already includes an AES key size check. If AES-NI is
unusable, invoke the function without the size check.

Also, use aes_check_keylen() instead of open code.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Cc: Eric Biggers <ebiggers@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-crypto@...r.kernel.org
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
---
V2 <- V1:
* Add as a new patch.
---
 arch/x86/crypto/aesni-intel_glue.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index b1d90c25975a..8b3b17b065ad 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -233,18 +233,16 @@ static int aes_set_key_common(struct crypto_aes_ctx *ctx,
 {
 	int err;
 
-	if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 &&
-	    key_len != AES_KEYSIZE_256)
-		return -EINVAL;
-
 	if (!crypto_simd_usable())
-		err = aes_expandkey(ctx, in_key, key_len);
-	else {
-		kernel_fpu_begin();
-		err = aesni_set_key(ctx, in_key, key_len);
-		kernel_fpu_end();
-	}
+		return aes_expandkey(ctx, in_key, key_len);
 
+	err = aes_check_keylen(key_len);
+	if (err)
+		return err;
+
+	kernel_fpu_begin();
+	err = aesni_set_key(ctx, in_key, key_len);
+	kernel_fpu_end();
 	return err;
 }
 
-- 
2.34.1