commit 9fc2442cc66c279cb962c90c4375746fc9b28bb9
author Jerome Forissier <jerome@forissier.org> Fri Jan 22 16:30:41 2021 +0100
committer Jérôme Forissier <jerome@forissier.org> Thu Feb 04 18:17:08 2021 +0100
tree f599b364ee9038f6402e3671a0aa812445190438
parent 1e149c24535c9f02cca39901afaa33088e295d34

libmbedtls: add SM2 curve

When MBEDTLS_ECP_DP_SM2_ENABLED is set, adds support for the ECC curve
defined for the Chinese SM2 algorithm (G/MT 0003 Part 5, [1]).

Link: [1] http://www.gmbz.org.cn/upload/2018-07-24/1532401863206085511.pdf
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

lib/libmbedtls/mbedtls/library/ecp.c

diff --git a/lib/libmbedtls/mbedtls/library/ecp.c b/lib/libmbedtls/mbedtls/library/ecp.c
index 1efc57a..ff86b0f 100644
--- a/lib/libmbedtls/mbedtls/library/ecp.c
+++ b/lib/libmbedtls/mbedtls/library/ecp.c
@@ -355,7 +355,8 @@
     defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)   ||   \
     defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) ||   \
     defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) ||   \
-    defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
+    defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) ||   \
+    defined(MBEDTLS_ECP_DP_SM2_ENABLED)
 #define ECP_SHORTWEIERSTRASS
 #endif
 
@@ -414,6 +415,10 @@
 #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) && defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
     { MBEDTLS_ECP_DP_CURVE25519,   29,     256,    "x25519"            },
 #endif
+#if defined(MBEDTLS_ECP_DP_SM2_ENABLED)
+    /* https://tools.ietf.org/id/draft-yang-tls-tls13-sm-suites-05.html */
+    { MBEDTLS_ECP_DP_SM2,          41,     256,    "sm2"               },
+#endif
     { MBEDTLS_ECP_DP_NONE,          0,     0,      NULL                },
 };