PDF-AS cleanups

1 files changed, 27 insertions, 0 deletions

diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/DigestHelper.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/DigestHelper.java
new file mode 100644
index 00000000..af002da4
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/DigestHelper.java
@@ -0,0 +1,27 @@
+package at.gv.egiz.pdfas.web.helper;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+import org.apache.commons.codec.binary.Hex;
+
+public class DigestHelper {
+
+	public static final String SHA1 = "SHA-1";
+	public static final String SHA224 = "SHA-224";
+	public static final String SHA256 = "SHA-256";
+	public static final String SHA384 = "SHA-384";
+	public static final String SHA512 = "SHA-512";
+	
+	public static String DefaulAlgorithm = SHA256;
+	
+	public static String getHexEncodedHash(byte[] data) throws NoSuchAlgorithmException {
+		return getHexEncodedHash(data, DefaulAlgorithm);
+	}
+	
+	public static String getHexEncodedHash(byte[] data, String algorithm) throws NoSuchAlgorithmException {
+		MessageDigest md = MessageDigest.getInstance(algorithm);
+		byte[] hash = md.digest(data);
+		return Hex.encodeHexString(hash);
+	}
+}