From: Andrei Botila andrei.botila@nxp.com
commit c91f734862664ca86dc3ee7e55f199e2bde829e4 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/crypto/caam/caamalg.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
--- 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 cr 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; @@ -1789,7 +1795,8 @@ static inline int skcipher_crypt(struct if (!req->cryptlen && !ctx->fallback) 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);