Add common check sum algorithms

[lgpl/argeo-commons.git] / org.argeo.util / src / org / argeo / util / DigestUtils.java

diff --git a/org.argeo.util/src/org/argeo/util/DigestUtils.java b/org.argeo.util/src/org/argeo/util/DigestUtils.java
index 83538167a4dd4c73ffae439a6d17c90b9fe5c07c..d2092aee02b030ab799e1915fa82db6fe4587f17 100644 (file)
--- a/org.argeo.util/src/org/argeo/util/DigestUtils.java
+++ b/org.argeo.util/src/org/argeo/util/DigestUtils.java
@@ -29,13 +29,18 @@ import java.security.NoSuchAlgorithmException;
 
 /** Utilities around cryptographic digests */
 public class DigestUtils {
+       public final static String MD5 = "MD5";
+       public final static String SHA1 = "SHA1";
+       public final static String SHA256 = "SHA-256";
+       public final static String SHA512 = "SHA-512";
+
        private static Boolean debug = false;
        // TODO: make it writable
        private final static Integer byteBufferCapacity = 100 * 1024;// 100 KB
 
        public static byte[] sha1(byte[] bytes) {
                try {
-                       MessageDigest digest = MessageDigest.getInstance("SHA1");
+                       MessageDigest digest = MessageDigest.getInstance(SHA1);
                        digest.update(bytes);
                        byte[] checksum = digest.digest();
                        return checksum;
@@ -119,6 +124,15 @@ public class DigestUtils {
                }
        }
 
+       public static String sha1hex(Path path) {
+               return digest(SHA1, path, byteBufferCapacity);
+       }
+
+       public static String digest(String algorithm, Path path, long bufferSize) {
+               byte[] digest = digestRaw(algorithm, path, bufferSize);
+               return encodeHexString(digest);
+       }
+
        public static byte[] digestRaw(String algorithm, Path file, long bufferSize) {
                long begin = System.currentTimeMillis();
                try {
@@ -137,7 +151,7 @@ public class DigestUtils {
                                                bb = fc.map(MapMode.READ_ONLY, position, bufferSize);
                                                position = position + bufferSize;
                                        } else {
-                                               bb = fc.map(MapMode.READ_ONLY, position, fileSize - bufferSize);
+                                               bb = fc.map(MapMode.READ_ONLY, position, fileSize - position);
                                                position = fileSize;
                                        }
                                        md.update(bb);
@@ -170,6 +184,7 @@ public class DigestUtils {
                        System.out.println(algorithm + ": " + digest(algorithm, file));
                        algorithm = "SHA";
                        System.out.println(algorithm + ": " + digest(algorithm, file));
+                       System.out.println(algorithm + ": " + sha1hex(file.toPath()));
                        algorithm = "SHA-256";
                        System.out.println(algorithm + ": " + digest(algorithm, file));
                        algorithm = "SHA-512";