[PATCH v7 09/11] crypto: qce: common: Set data unit size to message length for AES XTS transformation

From: Thara Gopinath <thara.gopinath@linaro.org>
To: herbert@gondor.apana.org.au, davem@davemloft.net,
	bjorn.andersson@linaro.org
Cc: ebiggers@google.com, ardb@kernel.org, sivaprak@codeaurora.org,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 09/11] crypto: qce: common: Set data unit size to message length for AES XTS transformation
Date: Thu, 11 Feb 2021 15:01:26 -0500	[thread overview]
Message-ID: <20210211200128.2886388-10-thara.gopinath@linaro.org> (raw)
In-Reply-To: <20210211200128.2886388-1-thara.gopinath@linaro.org>

Set the register REG_ENCR_XTS_DU_SIZE to cryptlen for AES XTS
transformation. Anything else causes the engine to return back
wrong results.

Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---
 drivers/crypto/qce/common.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/qce/common.c b/drivers/crypto/qce/common.c
index a73db2a5637f..f7bc701a4aa2 100644
--- a/drivers/crypto/qce/common.c
+++ b/drivers/crypto/qce/common.c
@@ -295,15 +295,15 @@ static void qce_xtskey(struct qce_device *qce, const u8 *enckey,
 {
 	u32 xtskey[QCE_MAX_CIPHER_KEY_SIZE / sizeof(u32)] = {0};
 	unsigned int xtsklen = enckeylen / (2 * sizeof(u32));
-	unsigned int xtsdusize;
 
 	qce_cpu_to_be32p_array((__be32 *)xtskey, enckey + enckeylen / 2,
 			       enckeylen / 2);
 	qce_write_array(qce, REG_ENCR_XTS_KEY0, xtskey, xtsklen);
 
-	/* xts du size 512B */
-	xtsdusize = min_t(u32, QCE_SECTOR_SIZE, cryptlen);
-	qce_write(qce, REG_ENCR_XTS_DU_SIZE, xtsdusize);
+	/* Set data unit size to cryptlen. Anything else causes
+	 * crypto engine to return back incorrect results.
+	 */
+	qce_write(qce, REG_ENCR_XTS_DU_SIZE, cryptlen);
 }
 
 static int qce_setup_regs_skcipher(struct crypto_async_request *async_req,
-- 
2.25.1

