linux-kernel - [PATCH 6/9] crypto: caam/qi2 - add support for more XTS key lengths

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Message-Id: <20200806114127.8650-7-andrei.botila@oss.nxp.com>
Date:   Thu,  6 Aug 2020 14:41:24 +0300
From:   Andrei Botila <andrei.botila@....nxp.com>
To:     Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/9] crypto: caam/qi2 - add support for more XTS key lengths

From: Andrei Botila <andrei.botila@....com>

CAAM accelerator only supports XTS-AES-128 and XTS-AES-256 since
it adheres strictly to the standard. All the other key lengths
are accepted and processed through a fallback as long as they pass
the xts_verify_key() checks.

Fixes: 226853ac3ebe ("crypto: caam/qi2 - add skcipher algorithms")
Cc: <stable@...r.kernel.org> # v4.20+
Signed-off-by: Andrei Botila <andrei.botila@....com>
---
 drivers/crypto/caam/caamalg_qi2.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/caam/caamalg_qi2.c b/drivers/crypto/caam/caamalg_qi2.c
index a0b13bf6b528..f2f137f47972 100644
--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -19,6 +19,7 @@
 #include <linux/fsl/mc.h>
 #include <soc/fsl/dpaa2-io.h>
 #include <soc/fsl/dpaa2-fd.h>
+#include <crypto/xts.h>
 #include <asm/unaligned.h>
 
 #define CAAM_CRA_PRIORITY	2000
@@ -1060,9 +1061,10 @@ static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
 	u32 *desc;
 	int err;
 
-	if (keylen != 2 * AES_MIN_KEY_SIZE  && keylen != 2 * AES_MAX_KEY_SIZE) {
+	err = xts_verify_key(skcipher, key, keylen);
+	if (err) {
 		dev_dbg(dev, "key size mismatch\n");
-		return -EINVAL;
+		return err;
 	}
 
 	err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
@@ -1475,7 +1477,9 @@ static int skcipher_encrypt(struct skcipher_request *req)
 	if (!req->cryptlen)
 		return 0;
 
-	if (ctx->fallback && xts_skcipher_ivsize(req)) {
+	if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+			      (ctx->cdata.keylen != 2 * AES_KEYSIZE_128 &&
+			       ctx->cdata.keylen != 2 * AES_KEYSIZE_256))) {
 		skcipher_request_set_tfm(&caam_req->fallback_req, ctx->fallback);
 		skcipher_request_set_callback(&caam_req->fallback_req,
 					      req->base.flags,
@@ -1518,7 +1522,9 @@ static int skcipher_decrypt(struct skcipher_request *req)
 	if (!req->cryptlen)
 		return 0;
 
-	if (ctx->fallback && xts_skcipher_ivsize(req)) {
+	if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+			      (ctx->cdata.keylen != 2 * AES_KEYSIZE_128 &&
+			       ctx->cdata.keylen != 2 * AES_KEYSIZE_256))) {
 		skcipher_request_set_tfm(&caam_req->fallback_req, ctx->fallback);
 		skcipher_request_set_callback(&caam_req->fallback_req,
 					      req->base.flags,
-- 
2.17.1