diff --git a/auto/sources b/auto/sources
index 730cca3..7ff0bb3 100644
--- a/auto/sources
+++ b/auto/sources
@@ -60,8 +60,6 @@ CORE_SRCS="src/core/nginx.c \
            src/core/ngx_file.c \
            src/core/ngx_crc32.c \
            src/core/ngx_murmurhash.c \
-           src/core/ngx_md5.c \
-           src/core/ngx_sha1.c \
            src/core/ngx_rbtree.c \
            src/core/ngx_radix_tree.c \
            src/core/ngx_slab.c \
diff --git a/src/core/ngx_md5.h b/src/core/ngx_md5.h
index 713b614..b7e83ce 100644
--- a/src/core/ngx_md5.h
+++ b/src/core/ngx_md5.h
@@ -12,17 +12,13 @@
 #include <ngx_config.h>
 #include <ngx_core.h>
 
+#include <openssl/md5.h>
 
-typedef struct {
-    uint64_t  bytes;
-    uint32_t  a, b, c, d;
-    u_char    buffer[64];
-} ngx_md5_t;
+typedef MD5_CTX  ngx_md5_t;
 
-
-void ngx_md5_init(ngx_md5_t *ctx);
-void ngx_md5_update(ngx_md5_t *ctx, const void *data, size_t size);
-void ngx_md5_final(u_char result[16], ngx_md5_t *ctx);
+#define ngx_md5_init    MD5_Init
+#define ngx_md5_update  MD5_Update
+#define ngx_md5_final   MD5_Final
 
 
 #endif /* _NGX_MD5_H_INCLUDED_ */
diff --git a/src/core/ngx_sha1.h b/src/core/ngx_sha1.h
index 4a98f71..e145d80 100644
--- a/src/core/ngx_sha1.h
+++ b/src/core/ngx_sha1.h
@@ -12,17 +12,13 @@
 #include <ngx_config.h>
 #include <ngx_core.h>
 
+#include <openssl/sha.h>
 
-typedef struct {
-    uint64_t  bytes;
-    uint32_t  a, b, c, d, e, f;
-    u_char    buffer[64];
-} ngx_sha1_t;
+typedef SHA_CTX  ngx_sha1_t;
 
-
-void ngx_sha1_init(ngx_sha1_t *ctx);
-void ngx_sha1_update(ngx_sha1_t *ctx, const void *data, size_t size);
-void ngx_sha1_final(u_char result[20], ngx_sha1_t *ctx);
+#define ngx_sha1_init    SHA1_Init
+#define ngx_sha1_update  SHA1_Update
+#define ngx_sha1_final   SHA1_Final
 
 
 #endif /* _NGX_SHA1_H_INCLUDED_ */