--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-12-12  Alexander V. Lukyanov  <lav@netis.ru>
+
+	md5, sha1, sha256, sha512: fix (trivial) compile error in c++ mode.
+	* lib/gl_openssl.h: Cast void pointers to a specific type.
+
 2013-12-07  Pádraig Brady <P@draigBrady.com>
 
 	open-tests: fix build failure with -Werror=old-style-declaration

--- a/lib/gl_openssl.h
+++ b/lib/gl_openssl.h
@@ -91,18 +91,18 @@
 
 GL_OPENSSL_INLINE void *
 GL_CRYPTO_FN (_finish_ctx) (struct _gl_ctx *ctx, void *res)
-{ OPENSSL_FN (_Final) (res, (_gl_CTX *) ctx); return res; }
+{ OPENSSL_FN (_Final) ((unsigned char *) res, (_gl_CTX *) ctx); return res; }
 
 GL_OPENSSL_INLINE void *
 GL_CRYPTO_FN (_buffer) (const char *buf, size_t len, void *res)
-{ return OPENSSL_FN () ((const unsigned char *) buf, len, res); }
+{ return OPENSSL_FN () ((const unsigned char *) buf, len, (unsigned char *) res); }
 
 GL_OPENSSL_INLINE void *
 GL_CRYPTO_FN (_read_ctx) (const struct _gl_ctx *ctx, void *res)
 {
   /* Assume any unprocessed bytes in ctx are not to be ignored.  */
   _gl_CTX tmp_ctx = *(_gl_CTX *) ctx;
-  OPENSSL_FN (_Final) (res, &tmp_ctx);
+  OPENSSL_FN (_Final) ((unsigned char *) res, &tmp_ctx);
   return res;
 }