On 8/26/2016 6:33 PM, Horia Geantă wrote:
> For algorithms that implement IV generators before the crypto ops,
> the IV needed for decryption is initially located in req->src
> scatterlist, not in req->iv.
>
> Avoid copying the IV into req->iv by modifying the (givdecrypt)
> descriptors to load it directly from req->src.
> aead_givdecrypt() is no longer needed and goes away.
>
> Cc: <sta...@vger.kernel.org> # 4.3+
> Fixes: 479bcc7c5b9e ("crypto: caam - Convert authenc to new AEAD interface")
> Signed-off-by: Horia Geantă <horia.gea...@nxp.com>
> ---
>
> drivers/crypto/caam/caamalg.c | 77
> +++++++++++++++++++++----------------------
> 1 file changed, 37 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
> index 6dc597126b79..775b8b524913 100644
> --- a/drivers/crypto/caam/caamalg.c
> +++ b/drivers/crypto/caam/caamalg.c
> @@ -556,7 +556,10 @@ skip_enc:
>
> /* Read and write assoclen bytes */
> append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
> - append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
> + if (alg->caam.geniv)
> + append_math_add_imm_u32(desc, VARSEQOUTLEN, REG3, IMM, ivsize);
> + else
> + append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
>
> /* Skip assoc data */
> append_seq_fifo_store(desc, 0, FIFOST_TYPE_SKIP | FIFOLDST_VLF);
> @@ -565,6 +568,14 @@ skip_enc:
> append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_MSG |
> KEY_VLF);
>
> + if (alg->caam.geniv) {
> + append_seq_load(desc, ivsize, LDST_CLASS_1_CCB |
> + LDST_SRCDST_BYTE_CONTEXT |
> + (ctx1_iv_off << LDST_OFFSET_SHIFT));
> + append_move(desc, MOVE_SRC_CLASS1CTX | MOVE_DEST_CLASS2INFIFO |
> + (ctx1_iv_off << MOVE_OFFSET_SHIFT) | ivsize);
> + }
> +
> /* Load Counter into CONTEXT1 reg */
> if (is_rfc3686)
> append_load_imm_u32(desc, be32_to_cpu(1), LDST_IMM |
> @@ -2150,7 +2161,7 @@ static void init_authenc_job(struct aead_request *req,
>
> init_aead_job(req, edesc, all_contig, encrypt);
>
> - if (ivsize && (is_rfc3686 || !(alg->caam.geniv && encrypt)))
> + if (ivsize && !alg->caam.geniv)
This condition update is incorrect, since IV won't be loaded neither
here nor in the givencrypt aead descriptor for rfc3686 case.
I'll send v3 shortly.
> append_load_as_imm(desc, req->iv, ivsize,
> LDST_CLASS_1_CCB |
> LDST_SRCDST_BYTE_CONTEXT |
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