tinyCrypt: Enforce matching setting of MBEDTLS_SSL_CONF_SINGLE_EC
We support only Secp256r1 through tinyCrypt, so enforce this by requiring
that MBEDTLS_SSL_CONF_SINGLE_EC is set and fixes that curve.
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 94ce3d1bc..f28345d 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -103,6 +103,13 @@
#error "MBEDTLS_USE_TINYCRYPT defined, but it cannot be defined with MBEDTLS_NO_64BIT_MULTIPLICATION"
#endif
+#if defined(MBEDTLS_USE_TINYCRYPT) && \
+ !( defined(MBEDTLS_SSL_CONF_SINGLE_EC) && \
+ MBEDTLS_SSL_CONF_SINGLE_EC_TLS_ID == 23 && \
+ MBEDTLS_SSL_CONF_SINGLE_EC_GRP_ID == MBEDTLS_ECP_DP_SECP256R1 )
+#error "MBEDTLS_USE_TINYCRYPT requires the use of MBEDTLS_SSL_CONF_SINGLE_EC to hardcode the choice of Secp256r1"
+#endif
+
#if defined(MBEDTLS_USE_TINYCRYPT) && \
!defined(MBEDTLS_SSL_CONF_RNG)
#error "MBEDTLS_USE_TINYCRYPT defined, but not all prerequesites"