Add OID tests for HMAC-xxx

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/suites/test_suite_oid.function b/tests/suites/test_suite_oid.function
index 3adc6af..337f843 100644
--- a/tests/suites/test_suite_oid.function
+++ b/tests/suites/test_suite_oid.function
@@ -97,6 +97,29 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
+void mbedtls_oid_get_md_hmac(data_t *oid, int exp_md_id)
+{
+    mbedtls_asn1_buf md_oid = { 0, 0, NULL };
+    int ret;
+    mbedtls_md_type_t md_id = 0;
+
+    md_oid.tag = MBEDTLS_ASN1_OID;
+    md_oid.p = oid->x;
+    md_oid.len = oid->len;
+
+    ret = mbedtls_oid_get_md_hmac(&md_oid, &md_id);
+
+    if (exp_md_id < 0) {
+        TEST_ASSERT(ret == MBEDTLS_ERR_OID_NOT_FOUND);
+        TEST_ASSERT(md_id == 0);
+    } else {
+        TEST_ASSERT(ret == 0);
+        TEST_ASSERT((mbedtls_md_type_t) exp_md_id == md_id);
+    }
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
 void oid_get_numeric_string(data_t *oid, int error_ret, char *result_str)
 {
     char buf[256];