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    Subject[PATCH 5.9 085/757] crypto: caam/jr - add support for more XTS key lengths
    Date
    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);

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