crypto: stm32/cryp - update to return iv_out

The kernel crypto API request output the next IV data to
IV buffer for CBC implementation.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index eb525669d4eb..cddcc97875b2 100644
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -393,6 +393,23 @@ static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, u32 *iv)
         }
 }
 
+static void stm32_cryp_get_iv(struct stm32_cryp *cryp)
+{
+        struct ablkcipher_request *req = cryp->req;
+        u32 *tmp = req->info;
+
+        if (!tmp)
+                return;
+
+        *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0LR));
+        *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0RR));
+
+        if (is_aes(cryp)) {
+                *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1LR));
+                *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1RR));
+        }
+}
+
 static void stm32_cryp_hw_write_key(struct stm32_cryp *c)
 {
         unsigned int i;
@@ -622,6 +639,9 @@ static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err)
                 /* Phase 4 : output tag */
                 err = stm32_cryp_read_auth_tag(cryp);
 
+        if (!err && (!(is_gcm(cryp) || is_ccm(cryp))))
+                stm32_cryp_get_iv(cryp);
+
         if (cryp->sgs_copied) {
                 void *buf_in, *buf_out;
                 int pages, len;