mx.com.pendulum.carga.util.Md5Converter.java Source code

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Here is the source code for mx.com.pendulum.carga.util.Md5Converter.java

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/*
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package mx.com.pendulum.carga.util;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import org.springframework.web.multipart.MultipartFile;

/**
 *
 * @author hmoctezuma
 */
public class Md5Converter {

    public static String calculaMD5(byte[] data) {
        InputStream is = new ByteArrayInputStream(data);
        try {
            byte[] buffer = new byte[1024];
            MessageDigest digest = MessageDigest.getInstance("MD5");
            int numRead = 0;
            while (numRead != -1) {
                numRead = is.read(buffer);
                if (numRead > 0) {
                    digest.update(buffer, 0, numRead);
                }
            }
            byte[] md5Bytes = digest.digest();
            return convertHashToString(md5Bytes);
        } catch (Exception e) {
            return null;
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (Exception e) {
                }
            }
        }

    }

    public static String getMD5Checksum(MultipartFile multipartFile) {
        InputStream is = null;
        try {
            is = new ByteArrayInputStream(multipartFile.getBytes());
            byte[] buffer = new byte[1024];
            MessageDigest digest = MessageDigest.getInstance("MD5");
            int numRead = 0;
            while (numRead != -1) {
                numRead = is.read(buffer);
                if (numRead > 0) {
                    digest.update(buffer, 0, numRead);
                }
            }
            byte[] md5Bytes = digest.digest();
            return convertHashToString(md5Bytes);
        } catch (Exception e) {
            return null;
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (Exception e) {
                }
            }
        }
    }

    private static String convertHashToString(byte[] md5Bytes) {
        String returnVal = "";
        for (int i = 0; i < md5Bytes.length; i++) {
            returnVal += Integer.toString((md5Bytes[i] & 0xff) + 0x100, 16).substring(1);
        }
        return returnVal.toUpperCase();
    }

}