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crypto: caam/qi - add support for more XTS key lengths 

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: b189817cf7 ("crypto: caam/qi - add ablkcipher and authenc algorithms")
Cc: <stable@vger.kernel.org> # v4.12+
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Andrei Botila 2020-09-22 19:03:23 +03:00 committed by Herbert Xu
parent c91f734862
commit 62b9a66909
1 changed files with 10 additions and 3 deletions
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13
drivers/crypto/caam/caamalg_qi.c
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@ -18,6 +18,7 @@
#include "qi.h"
#include "jr.h"
#include "caamalg_desc.h"
#include <crypto/xts.h>
#include <asm/unaligned.h>
/*
@ -68,6 +69,7 @@ struct caam_ctx {
struct device *qidev;
spinlock_t lock; /* Protects multiple init of driver context */
struct caam_drv_ctx *drv_ctx[NUM_OP];
bool xts_key_fallback;
struct crypto_skcipher *fallback;
};
@ -734,11 +736,15 @@ static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
int ret = 0;
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;
@ -1402,7 +1408,8 @@ 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);