[PATCH] cryptodev: add elliptic curve diffie hellman

[Arek Kusztal]

This commit adds Elliptic Curve Diffie-Hellman option to Cryptodev.
This could be achieved with EC point multiplication but:
1) Phase 1 of DH is used with EC generator, multiplication expect
setting generator manually.
2) It will unify usage of DH.
3) Can be extended easily to support X25519 and X448.

Signed-off-by: Arek Kusztal <arkadiuszx.kusz...@intel.com>
---
Depends-on: series-22398 ("cryptodev: move dh type from xform to dh op")

 lib/cryptodev/rte_crypto_asym.h | 41 +++++++++++++++++++++++++----------------
 1 file changed, 25 insertions(+), 16 deletions(-)

diff --git a/lib/cryptodev/rte_crypto_asym.h b/lib/cryptodev/rte_crypto_asym.h
index 40c1d90604..e65222b802 100644
--- a/lib/cryptodev/rte_crypto_asym.h
+++ b/lib/cryptodev/rte_crypto_asym.h
@@ -91,6 +91,8 @@ enum rte_crypto_asym_xform_type {
        /**< Elliptic Curve Digital Signature Algorithm
         * Perform Signature Generation and Verification.
         */
+       RTE_CRYPTO_ASYM_XFORM_ECDH,
+       /**< Elliptic Curve Diffie Hellman */
        RTE_CRYPTO_ASYM_XFORM_ECPM,
        /**< Elliptic Curve Point Multiplication */
        RTE_CRYPTO_ASYM_XFORM_TYPE_LIST_END
@@ -385,34 +387,41 @@ struct rte_crypto_rsa_op_param {
 };
 
 /**
- * Diffie-Hellman Operations params.
+ * Diffie-Hellman/Elliptic Curve Diffie-Hellman operation.
  * @note:
  */
 struct rte_crypto_dh_op_param {
        enum rte_crypto_asym_op_type op_type;
        /**< Diffie-Hellman operation phase */
-       rte_crypto_uint pub_key;
+
+       rte_crypto_param priv_key;
        /**<
-        * Output generated public key when op_type is
-        * DH PUB_KEY_GENERATION.
-        * Input peer public key when op_type is DH
-        * SHARED_SECRET_COMPUTATION
-        *
+        * Diffie-Hallman private part
+        * For DH and ECDH it is big-endian integer.
+        * Input for both phases of Diffie-Hellman
         */
 
-       rte_crypto_uint priv_key;
+       union {
+               rte_crypto_uint pub_key;
+               struct rte_crypto_ec_point pub_point;
+       };
        /**<
-        * Output generated private key if op_type is
-        * DH PRIVATE_KEY_GENERATION
-        * Input when op_type is DH SHARED_SECRET_COMPUTATION.
-        *
+        * Diffie-Hallman public part
+        * For DH it is big-endian unsigned integer.
+        * For ECDH it is a point on the curve.
+        * Output for RTE_CRYPTO_ASYM_OP_PUBLIC_KEY_GENERATE
+        * Input for RTE_CRYPTO_ASYM_OP_SHARED_SECRET_COMPUTE
         */
 
-       rte_crypto_uint shared_secret;
+       union {
+               rte_crypto_uint shared_secret;
+               struct rte_crypto_ec_point shared_point;
+       };
        /**<
-        * Output with calculated shared secret
-        * when dh op_type = SHARED_SECRET_COMPUTATION.
-        *
+        * Diffie-Hallman shared secret
+        * For DH it is big-endian unsigned integer.
+        * For ECDH it is a point on the curve.
+        * Output for RTE_CRYPTO_ASYM_OP_SHARED_SECRET_COMPUTE
         */
 };
 
-- 
2.13.6