diff --git a/src/core/ngx_string.c b/src/core/ngx_string.c
index 312e819..a007cac 100644
--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -69,6 +69,15 @@
 }
 
 
+void ngx_print_md5(char *text, u_char *md5)
+{
+    ngx_snprintf(text, 33, "%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x%0x",
+                 md5[0], md5[1], md5[2], md5[3], md5[4], md5[5],
+                 md5[6], md5[7], md5[8], md5[9], md5[10], md5[11],
+                 md5[12], md5[13], md5[14], md5[15]);
+}
+
+
 #if 0
 char *ngx_psprintf(ngx_pool_t *p, const char *fmt, ...)
 {
diff --git a/src/core/ngx_string.h b/src/core/ngx_string.h
index 665c844..fe60cad 100644
--- a/src/core/ngx_string.h
+++ b/src/core/ngx_string.h
@@ -61,6 +61,9 @@
 int ngx_rstrncmp(char *s1, char *s2, size_t n);
 int ngx_atoi(char *line, size_t n);
 
+void ngx_print_md5(char *text, u_char *md5);
+
+
 #define  ngx_qsort                qsort