Added submodule contents into tree

externals/mbedtls/programs/hash/hello.c

@@ -0,0 +1,45 @@
+/*
+ *  Classic "Hello, world" demonstration program
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/platform.h"
+
+#if defined(MBEDTLS_MD5_C)
+#include "mbedtls/md5.h"
+#endif
+
+#if !defined(MBEDTLS_MD5_C)
+int main(void)
+{
+    mbedtls_printf("MBEDTLS_MD5_C not defined.\n");
+    mbedtls_exit(0);
+}
+#else
+
+
+int main(void)
+{
+    int i, ret;
+    unsigned char digest[16];
+    char str[] = "Hello, world!";
+
+    mbedtls_printf("\n  MD5('%s') = ", str);
+
+    if ((ret = mbedtls_md5((unsigned char *) str, 13, digest)) != 0) {
+        mbedtls_exit(MBEDTLS_EXIT_FAILURE);
+    }
+
+    for (i = 0; i < 16; i++) {
+        mbedtls_printf("%02x", digest[i]);
+    }
+
+    mbedtls_printf("\n\n");
+
+    mbedtls_exit(MBEDTLS_EXIT_SUCCESS);
+}
+#endif /* MBEDTLS_MD5_C */