[PATCH v4 04/12] cryptodev: clarify usage of private key in dh

[Arek Kusztal]

- Clarified usage of private key in Diffie-Hellman.
CSRNG capable device should generate private key and then
use it for public key generation.

Signed-off-by: Arek Kusztal <arkadiuszx.kusztal at intel.com>
---
 lib/cryptodev/rte_crypto_asym.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/cryptodev/rte_crypto_asym.h b/lib/cryptodev/rte_crypto_asym.h
index eb753b4016..619c0614bf 100644
--- a/lib/cryptodev/rte_crypto_asym.h
+++ b/lib/cryptodev/rte_crypto_asym.h
@@ -416,6 +416,11 @@ struct rte_crypto_dh_op_param {
 	 * Input - private key, when dh xform ke_type is one of:
 	 * RTE_CRYPTO_ASYM_KE_PUB_KEY_GENERATE,
 	 * RTE_CRYPTO_ASYM_KE_SHARED_SECRET_COMPUTE.
+	 *
+	 * In case priv_key.length is 0 and xform type is set with
+	 * RTE_CRYPTO_ASYM_KE_PUB_KEY_GENERATE, CSRNG capable
+	 * device will generate a private key and use it for public
+	 * key generation.
 	 */
 
 	rte_crypto_uint shared_secret;
-- 
2.13.6