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authorAndrei Botila <andrei.botila@nxp.com>2020-09-22 19:03:22 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2020-10-02 11:02:11 +0300
commitc91f734862664ca86dc3ee7e55f199e2bde829e4 (patch)
tree970e2f070897452e7e6f530bd60735b9195c168b /drivers/crypto/caam
parent36e2d7cfdcf17b6126863d884d4200191e922524 (diff)
downloadlinux-c91f734862664ca86dc3ee7e55f199e2bde829e4.tar.xz
crypto: caam/jr - 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: c6415a6016bf ("crypto: caam - add support for acipher xts(aes)") Cc: <stable@vger.kernel.org> # v4.4+ 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>
Diffstat (limited to 'drivers/crypto/caam')
-rw-r--r--drivers/crypto/caam/caamalg.c13
1 files 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);