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Subject[PATCH 3/3] crypto: stm32/cryp - update to return iv_out
Date
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>
---
drivers/crypto/stm32/stm32-cryp.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index eb525669..cddcc97 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;
--
2.7.4
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