Fix pctx leak with RAII wrapper

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 
 - CA certificate bundles used for JWT refresh and containing more than one certificate are now handled correctly (#6817).
+- Memory leak during EC key creation is fixed (#6845).
 - Fixed thread-safety issues when CCF nodes attempted to contact non-TLS servers. This previously could cause errors when running SNP builds with multiple worker threads (#6836).
 
 ## [6.0.0-dev19]

src/crypto/openssl/public_key.cpp

@@ -288,7 +288,7 @@ namespace ccf::crypto
       OSSL_PKEY_PARAM_PUB_KEY, (void*)raw.data(), raw.size());
     params[2] = OSSL_PARAM_construct_end();
 
-    auto pctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
+    Unique_EVP_PKEY_CTX pctx("EC");
     CHECK1(EVP_PKEY_fromdata_init(pctx));
 
     EVP_PKEY* pkey = NULL;