From af90012c848711a4c9010dbcf71694dbfbca0e86 Mon Sep 17 00:00:00 2001
From: Andreas Fitzek <andreas.fitzek@iaik.tugraz.at>
Date: Thu, 10 Jul 2014 12:09:05 +0200
Subject: Integrity verification of Signature after Signature creation to
ensure correct signed Document
---
.../common/exceptions/PdfAsSignatureException.java | 4 ++
.../at/gv/egiz/pdfas/common/utils/PDFUtils.java | 27 +++++++++++++
.../at/gv/egiz/pdfas/common/utils/StreamUtils.java | 44 ++++++++++++++--------
3 files changed, 59 insertions(+), 16 deletions(-)
(limited to 'pdf-as-common/src/main/java/at')
diff --git a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/exceptions/PdfAsSignatureException.java b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/exceptions/PdfAsSignatureException.java
index 759a9ec8..f701bffc 100644
--- a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/exceptions/PdfAsSignatureException.java
+++ b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/exceptions/PdfAsSignatureException.java
@@ -33,4 +33,8 @@ public class PdfAsSignatureException extends PdfAsException {
public PdfAsSignatureException(String msgId, Throwable e) {
super(msgId, e);
}
+
+ public PdfAsSignatureException(String msgId) {
+ super(msgId);
+ }
}
diff --git a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java
index 8eb2e8bb..68cfd80a 100644
--- a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java
+++ b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java
@@ -99,6 +99,33 @@ public class PDFUtils {
return data;
}
+ public static byte[] extractSignatureData(byte[] signatureData, int[] byteRange) throws PDFIOException {
+ if(byteRange.length % 2 != 0) {
+ throw new PDFIOException("error.pdf.io.09");
+ }
+
+ int lastOffset = byteRange[byteRange.length - 2];
+ int lastSize = byteRange[byteRange.length - 1];
+
+ int dataSize = lastOffset + lastSize;
+
+ byte[] data = new byte[dataSize];
+ int currentdataOff = 0;
+
+ Arrays.fill(data, (byte)0x0);
+
+ for(int i = 0; i < byteRange.length; i = i + 2) {
+ int offset = byteRange[i];
+ int size = byteRange[i+1];
+
+ for(int j = 0; j < size; j++) {
+ data[offset + j] = signatureData[currentdataOff];
+ currentdataOff++;
+ }
+ }
+ return data;
+ }
+
private static int extractASCIIInteger(byte[] data, int offset) {
int nextsepp = nextSeperator(data, offset);
diff --git a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/StreamUtils.java b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/StreamUtils.java
index 579099f0..50ec444c 100644
--- a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/StreamUtils.java
+++ b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/StreamUtils.java
@@ -28,24 +28,36 @@ import java.io.IOException;
import java.io.InputStream;
/**
- * Created with IntelliJ IDEA.
- * User: afitzek
- * Date: 8/29/13
- * Time: 9:54 AM
- * To change this template use File | Settings | File Templates.
+ * Created with IntelliJ IDEA. User: afitzek Date: 8/29/13 Time: 9:54 AM To
+ * change this template use File | Settings | File Templates.
*/
public class StreamUtils {
- public static byte[] inputStreamToByteArray(InputStream stream) throws IOException {
- ByteArrayOutputStream bos = new ByteArrayOutputStream();
- byte[] buffer = new byte[4096];
- int readBytes = 0;
+ public static byte[] inputStreamToByteArray(InputStream stream)
+ throws IOException {
+ ByteArrayOutputStream bos = new ByteArrayOutputStream();
+ byte[] buffer = new byte[4096];
+ int readBytes = 0;
- while((readBytes = stream.read(buffer)) != -1) {
- bos.write(buffer, 0, readBytes);
- }
- stream.close();
- bos.close();
- return bos.toByteArray();
- }
+ while ((readBytes = stream.read(buffer)) != -1) {
+ bos.write(buffer, 0, readBytes);
+ }
+ stream.close();
+ bos.close();
+ return bos.toByteArray();
+ }
+
+ public static boolean dataCompare(byte[] a, byte[] b) {
+ if (a != null && b != null) {
+ if (a.length == b.length) {
+ for(int i = 0; i < a.length; i++) {
+ if(a[i] != b[i]) {
+ return false;
+ }
+ }
+ return true;
+ }
+ }
+ return false;
+ }
}
--
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