change md5

Author: androidlgf

VideoOS/VenvyLibrary/src/main/java/cn/com/venvy/common/utils/VenvyMD5Util.java

@@ -2,6 +2,9 @@
 
 import android.text.TextUtils;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.math.BigInteger;
 import java.nio.charset.Charset;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -94,28 +97,26 @@ private static String SHA(final String strText, final String strType) {
         return strResult;
     }
 
-    public static String EncoderByMd5(String buf) {
+    public static String EncoderByMd5(File file) {
+        if (!file.isFile()) {
+            return null;
+        }
+        String encodeMd5String;
         try {
-            MessageDigest digist = MessageDigest.getInstance("MD5");
-            byte[] rs = digist.digest(buf.getBytes("UTF-8"));
-            StringBuffer digestHexStr = new StringBuffer();
-            for (int i = 0; i < 16; i++) {
-                digestHexStr.append(byteHEX(rs[i]));
+            MessageDigest digest = MessageDigest.getInstance("MD5");
+            FileInputStream in = new FileInputStream(file);
+            byte buffer[] = new byte[1024];
+            int len;
+            while ((len = in.read(buffer, 0, 1024)) != -1) {
+                digest.update(buffer, 0, len);
             }
-            return digestHexStr.toString();
+            in.close();
+            BigInteger bigInt = new BigInteger(1, digest.digest());
+            encodeMd5String = bigInt.toString(16);
         } catch (Exception e) {
             e.printStackTrace();
+            encodeMd5String = null;
         }
-        return null;
-
-    }
-
-    public static String byteHEX(byte ib) {
-        char[] Digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
-        char[] ob = new char[2];
-        ob[0] = Digit[(ib >>> 4) & 0X0F];
-        ob[1] = Digit[ib & 0X0F];
-        String s = new String(ob);
-        return s;
+        return encodeMd5String;
     }
 }