diff --git a/sha1collisiondetection-1.0.3-io-fixes.patch b/sha1collisiondetection-1.0.3-io-fixes.patch
new file mode 100644
index 0000000..4553ee0
--- /dev/null
+++ b/sha1collisiondetection-1.0.3-io-fixes.patch
@@ -0,0 +1,74 @@
+From: Andreas Stieger <astieger@suse.com>
+Date: Mon, 8 May 2017 21:51:28 +0200
+Subject: some IO improvements
+References: https://github.com/cr-marcstevens/sha1collisiondetection/pull/28
+
+---
+ src/main.c | 7 ++++---
+ 1 file changed, 4 insertions(+), 3 deletions(-)
+
+Index: sha1collisiondetection-stable-v1.0.3/src/main.c
+===================================================================
+--- sha1collisiondetection-stable-v1.0.3.orig/src/main.c	2017-05-22 18:17:51.339889238 +0200
++++ sha1collisiondetection-stable-v1.0.3/src/main.c	2017-05-22 18:18:14.471988044 +0200
+@@ -8,6 +8,7 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <errno.h>
+ #include <libgen.h>
+ 
+ #include "sha1.h"
+@@ -23,7 +24,7 @@ int main(int argc, char** argv)
+ 
+ 	if (argc < 2)
+ 	{
+-		printf("Usage: %s <file>\n", basename(argv[0]));
++		fprintf(stderr, "Usage: %s <file>\n", basename(argv[0]));
+ 		return 1;
+ 	}
+ 
+@@ -37,10 +38,14 @@ int main(int argc, char** argv)
+ 			SHA1DCSetDetectReducedRoundCollision(&ctx2, 1);
+ 		}
+ 
+-		fd = fopen(argv[i], "rb");
++		if(!strcmp(argv[i],"-")) {
++			fd = stdin;
++		} else {
++			fd = fopen(argv[i], "rb");
++		}
+ 		if (fd == NULL)
+ 		{
+-			printf("cannot open file: %s\n", argv[i]);
++			fprintf(stderr, "cannot open file: %s: %s\n", argv[i], strerror(errno));
+ 			return 1;
+ 		}
+ 
+@@ -53,12 +58,12 @@ int main(int argc, char** argv)
+ 		}
+ 		if (ferror(fd))
+ 		{
+-			printf("error while reading file: %s\n", argv[i]);
++			fprintf(stderr, "error while reading file: %s: %s\n", argv[i], strerror(errno));
+ 			return 1;
+ 		}
+ 		if (!feof(fd))
+ 		{
+-			printf("not end of file?: %s\n",argv[i]);
++			fprintf(stderr, "not end of file?: %s: %s\n", argv[i], strerror(errno));
+ 			return 1;
+ 		}
+ 
+Index: sha1collisiondetection-stable-v1.0.3/README.md
+===================================================================
+--- sha1collisiondetection-stable-v1.0.3.orig/README.md	2017-05-22 18:17:51.339889238 +0200
++++ sha1collisiondetection-stable-v1.0.3/README.md	2017-05-22 18:17:54.539902741 +0200
+@@ -51,6 +51,7 @@ Examples:
+ ```
+ bin/sha1dcsum test/sha1_reducedsha_coll.bin test/shattered-1.pdf
+ bin/sha1dcsum_partialcoll test/sha1reducedsha_coll.bin test/shattered-1.pdf
++pipe_data | bin/sha1dcsum -
+ ```
+ 
+ ## Library usage
diff --git a/sha1collisiondetection.changes b/sha1collisiondetection.changes
index fdca582..a63a206 100644
--- a/sha1collisiondetection.changes
+++ b/sha1collisiondetection.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon May 22 16:20:43 UTC 2017 - astieger@suse.com
+
+- better printing of errors, and allow hashing stdin
+  add sha1collisiondetection-1.0.3-io-fixes.patch
+
 -------------------------------------------------------------------
 Mon Apr 10 13:29:43 UTC 2017 - astieger@suse.com
 
diff --git a/sha1collisiondetection.spec b/sha1collisiondetection.spec
index e3c098b..b4ea56e 100644
--- a/sha1collisiondetection.spec
+++ b/sha1collisiondetection.spec
@@ -25,6 +25,7 @@ License:        MIT
 Group:          Productivity/Security
 Url:            https://github.com/cr-marcstevens/sha1collisiondetection
 Source:         https://github.com/cr-marcstevens/sha1collisiondetection/archive/stable-v%{version}.tar.gz#/%{name}-%{version}.tar.gz
+Patch0:         sha1collisiondetection-1.0.3-io-fixes.patch
 BuildRequires:  libtool
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
@@ -59,6 +60,7 @@ It is very fast and takes less than twice the amount of time as regular SHA-1.
 
 %prep
 %setup -q -n %{name}-stable-v%{version}
+%patch0 -p1
 
 %build
 export TARGETCFLAGS="%{optflags}"