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: c6415a6016bf ("crypto: caam - add support for acipher xts(aes)")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.4+
Signed-off-by: Andrei Botila <andrei.botila@xxxxxxx>
---
drivers/crypto/caam/caamalg.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index adb2c05a8bde..a79b26f84169 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -57,6 +57,7 @@
#include "key_gen.h"
#include "caamalg_desc.h"
#include <crypto/engine.h>
+#include <crypto/xts.h>
#include <asm/unaligned.h>
/*
@@ -115,6 +116,7 @@ struct caam_ctx {
struct alginfo adata;
struct alginfo cdata;
unsigned int authsize;
+ bool xts_key_fallback;
struct crypto_skcipher *fallback;
};
@@ -835,11 +837,15 @@ 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(jrdev, "key size mismatch\n");
- return -EINVAL;
+ return err;
}
+ if (keylen != 2 * AES_KEYSIZE_128 && keylen != 2 * AES_KEYSIZE_256)
+ ctx->xts_key_fallback = true;
+
err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
if (err)
return err;
@@ -1784,7 +1790,8 @@ static inline int skcipher_crypt(struct skcipher_request *req, bool encrypt)
if (!req->cryptlen)
return 0;
- if (ctx->fallback && xts_skcipher_ivsize(req)) {
+ if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+ ctx->xts_key_fallback)) {
struct caam_skcipher_req_ctx *rctx = skcipher_request_ctx(req);
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
--
2.17.1
