diff --git a/src/jws.c b/src/jws.c
index 2e314d9..9dda454 100644
--- a/src/jws.c
+++ b/src/jws.c
@@ -565,6 +565,8 @@ static bool _cjose_jws_build_sig_ec(
         const cjose_jwk_t *jwk,
         cjose_err *err)
 {
+    bool retval = false;
+
     // ensure jwk is EC
     if (jwk->kty != CJOSE_JWK_KTY_EC)
     {
@@ -579,7 +581,7 @@ static bool _cjose_jws_build_sig_ec(
     if (NULL == ecdsa_sig)
     {
         CJOSE_ERROR(err, CJOSE_ERR_CRYPTO);
-        return false;
+        goto _cjose_jws_build_sig_ec_cleanup;
     }
 
     // allocate buffer for signature
@@ -599,7 +601,7 @@ static bool _cjose_jws_build_sig_ec(
     if (NULL == jws->sig)
     {
         CJOSE_ERROR(err, CJOSE_ERR_NO_MEMORY);
-        return false;
+        goto _cjose_jws_build_sig_ec_cleanup;
     }
 
     memset(jws->sig, 0, jws->sig_len);
@@ -613,10 +615,16 @@ static bool _cjose_jws_build_sig_ec(
             &jws->sig_b64u, &jws->sig_b64u_len, err))
     {
         CJOSE_ERROR(err, CJOSE_ERR_CRYPTO);
-        return false;
+        goto _cjose_jws_build_sig_ec_cleanup;
     }
 
-    return true;
+    retval = true;
+
+    _cjose_jws_build_sig_ec_cleanup:
+    if (ecdsa_sig)
+        ECDSA_SIG_free(ecdsa_sig);
+
+    return retval;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/test/check_jwe.c b/test/check_jwe.c
index 36606c6..5682afe 100644
--- a/test/check_jwe.c
+++ b/test/check_jwe.c
@@ -170,6 +170,12 @@ static void _self_encrypt_self_decrypt(const char *plain1)
             JWK_RSA, 
             plain1);
 
+    _self_encrypt_self_decrypt_with_key(
+            CJOSE_HDR_ALG_RSA1_5,
+            CJOSE_HDR_ENC_A256GCM,
+            JWK_RSA,
+            plain1);
+
     _self_encrypt_self_decrypt_with_key(
             CJOSE_HDR_ALG_DIR, 
             CJOSE_HDR_ENC_A256GCM, 
@@ -458,7 +464,7 @@ START_TEST(test_cjose_jwe_import_export_compare)
     // re-export the jwe object
     const char *cser = cjose_jwe_export(jwe, &err);
     ck_assert_msg(NULL != cser,
-            "re-export of imported JWE faied: "
+            "re-export of imported JWE failed: "
             "%s, file: %s, function: %s, line: %ld", 
             err.message, err.file, err.function, err.line);
 
diff --git a/test/check_jwk.c b/test/check_jwk.c
index 572f6e3..2e1b4e7 100644
--- a/test/check_jwk.c
+++ b/test/check_jwk.c
@@ -496,6 +496,7 @@ START_TEST(test_cjose_jwk_to_json_ec)
             ",\"y\":\"KbkZ7r_DQ-t67pnxPnFDHObTLBqn44BSjcqn0STUkaM\"}",
             json
     );
+    free(json);
 
     json = cjose_jwk_to_json(jwk, true, &err);
     ck_assert(NULL != json);
@@ -505,6 +506,7 @@ START_TEST(test_cjose_jwk_to_json_ec)
             ",\"y\":\"KbkZ7r_DQ-t67pnxPnFDHObTLBqn44BSjcqn0STUkaM\""
             ",\"d\":\"RSSjcBQW_EBxm1gzYhejCdWtj3Id_GuwldwEgSuKCEM\"}",
             json);
+    free(json);
 
     cjose_jwk_release(jwk);
 }
@@ -543,8 +545,7 @@ START_TEST(test_cjose_jwk_to_json_rsa)
     const char *json;
     json = cjose_jwk_to_json(jwk, false, &err);
     ck_assert(NULL != json);
-    ck_assert_str_eq(RSA_PUBLIC_JSON, json
-    );
+    ck_assert_str_eq(RSA_PUBLIC_JSON, json);
     free(json);
 
     json = cjose_jwk_to_json(jwk, true, &err);
@@ -679,7 +680,7 @@ START_TEST(test_cjose_jwk_import_valid)
         // get json representation of "after" 
         const char *jwk_str = cjose_jwk_to_json(jwk, true, &err);
         json_t *right_json = json_loads(jwk_str, 0, NULL);
-        ck_assert(NULL != right_json);        
+        ck_assert(NULL != right_json);
 
         // check that cooresponding attributes match up
         const char *attrs[] = { "kty", "crv", "x", "y", "d", "kid", 
@@ -689,6 +690,7 @@ START_TEST(test_cjose_jwk_import_valid)
             ck_assert_str_eq(JWK[i], jwk_str);
         }
 
+        free(jwk_str);
         json_decref(left_json);
         json_decref(right_json);
         cjose_jwk_release(jwk);
@@ -955,6 +957,7 @@ START_TEST(test_cjose_jwk_EC_import_with_priv_export_with_pub)
         ck_assert_str_eq(JWK_OUT, jwk_str);
     }
 
+    free(jwk_str);
     json_decref(left_json);
     json_decref(right_json);
     cjose_jwk_release(jwk);