From: Andrei Botila <andrei.botila@xxxxxxx>
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@xxxxxxxxxxxxxxx> # v4.20+
Signed-off-by: Andrei Botila <andrei.botila@xxxxxxx>
---
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
