diff -Nru xml-security-c-1.7.3/debian/changelog xml-security-c-1.7.3/debian/changelog
--- xml-security-c-1.7.3/debian/changelog	2015-11-29 19:00:43.000000000 +0000
+++ xml-security-c-1.7.3/debian/changelog	2019-03-07 18:03:19.000000000 +0000
@@ -1,3 +1,11 @@
+xml-security-c (1.7.3-1ubuntu0.1) xenial-security; urgency=medium
+
+  * debian/patches/99-xsecsafebuffer.patch: Fix undefined behavior in
+    XSECSafeBuffer that affect ECDSA signature generation. This fix was
+    introduced in serie 2.x, but it was not backported to serie 1.7.x.
+
+ -- Alejandro Claro <alejandro.claro@smartmatic.com>  Fri, 22 Feb 2019 16:30:42 +0100
+
 xml-security-c (1.7.3-1) unstable; urgency=medium
 
   * [df661d6] Check signature in watch file
@@ -306,7 +314,7 @@
     - Provide ability for calling application to define whether references
       are interlocking.
     - Complete implementation of XKMS message set
-    - Methods to allow loading of encrypted data without doing decrypt 
+    - Methods to allow loading of encrypted data without doing decrypt
       and to process a decrypt/encrypt operation without replacing the
       original nodes.
     - Various bug fixes.
diff -Nru xml-security-c-1.7.3/debian/control xml-security-c-1.7.3/debian/control
--- xml-security-c-1.7.3/debian/control	2015-11-29 19:00:43.000000000 +0000
+++ xml-security-c-1.7.3/debian/control	2019-03-07 18:03:19.000000000 +0000
@@ -1,7 +1,8 @@
 Source: xml-security-c
 Section: libs
 Priority: extra
-Maintainer: Debian Shib Team <pkg-shibboleth-devel@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Shib Team <pkg-shibboleth-devel@lists.alioth.debian.org>
 Uploaders:
  Russ Allbery <rra@debian.org>,
  Ferenc Wágner <wferi@niif.hu>,
diff -Nru xml-security-c-1.7.3/debian/patches/99-xsecsafebuffer.patch xml-security-c-1.7.3/debian/patches/99-xsecsafebuffer.patch
--- xml-security-c-1.7.3/debian/patches/99-xsecsafebuffer.patch	1970-01-01 00:00:00.000000000 +0000
+++ xml-security-c-1.7.3/debian/patches/99-xsecsafebuffer.patch	2019-03-07 18:03:19.000000000 +0000
@@ -0,0 +1,15 @@
+Description: Fix a length bug in concat method.
+Origin: upstream, http://svn.apache.org/viewvc?view=revision&revision=1807280
+Index: xml-security-c-1.7.3/xsec/utils/XSECSafeBuffer.cpp
+===================================================================
+--- xml-security-c-1.7.3.orig/xsec/utils/XSECSafeBuffer.cpp	2019-02-22 15:16:17.000000000 +0100
++++ xml-security-c-1.7.3/xsec/utils/XSECSafeBuffer.cpp	2019-02-22 15:18:04.000000000 +0100
+@@ -639,7 +639,7 @@
+ 
+ 	assert (t != NULL);
+ 
+-	len += XMLString::stringLen(t);
++	len += XMLString::stringLen(t) * size_XMLCh;
+ 	len += (xsecsize_t) (2 * size_XMLCh);
+ 
+ 	checkAndExpand(len);
diff -Nru xml-security-c-1.7.3/debian/patches/series xml-security-c-1.7.3/debian/patches/series
--- xml-security-c-1.7.3/debian/patches/series	2015-11-29 19:00:43.000000000 +0000
+++ xml-security-c-1.7.3/debian/patches/series	2019-03-07 18:03:19.000000000 +0000
@@ -1,2 +1,3 @@
 Add-xsec-prefix-to-utilities.patch
 Avoid-forward-incompatibility-warnings-from-Automake.patch
+99-xsecsafebuffer.patch