MD5对文件File加密，二进制byte[]+Md5加密，Md5字符串String加密java工具类，返回Md5字符串

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前言：

主要是针对文件上传OSS，需要对文件名进行Md5赋值，这样不会冲突，之前是对文件名String赋值，Md5加密后得到字符串，可是同样的名称的文件加密是会有问题的。

主要实现的java工具类：

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.Base64;

public class EncdDecd {
    private static String key = "MIIBUgIBADANBgkqhkiG9w0BAQEFAASCATwwggE4AgEAAkEAmrQOnp8Rn0sRVP/8D024fTtAFx0BoyCyvBL65mOh+7WETWiF0suOp8YkZk/ns0p1AwkVwG8d+uDwddwrS41I6wIBEQJAOya6S7VKgKvC3Lw6uo6obB4vF+VxkTImONoUo2JUheLsxCwR1uNhijluDe0Pw3Q43dX6LHl4JHvx6fHlEvilhQIhANcdLBrsdk8ZohgxCGWbM99DE3qu/QDj/CNG2+C0HNZ3AiEAuBt6Y6CgGRDwTtXHzwU1Y3vF+RNIHfKM8gY438hImi0CIQCX2FteTI+/XWNcXtjAMVHKxe+h5O7Tc8EJ16pEQuct+QIgIH1R1ViUuSEbWTTI6Ew2mRXXpGzQfcFkKrXNzSNYGzUCID4CJH2+6BuWLSTX2h+i7y8eOUE5vEqrswpEjK4PZSj6";

    public static String EncodeBase64(byte[] data) {
        return Base64.getEncoder().encodeToString(data);
    }

    public static String EncodeBase64(String str) {
        return EncodeBase64(str.getBytes());
    }


    public static String EncodeBase64(File file) {
        String result = null;
        try {
            FileInputStream in = new FileInputStream(file);
            byte[] buffer = new byte[(int) file.length()];
            in.read(buffer);
            in.close();
            result = EncodeBase64(buffer);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;

    }

    public static String DecodeBase64(String str) {
        String result = new String(Base64.getDecoder().decode(str));
        return result;
    }

    public static void DecodeBase64(String str, String outFile) {
        try {
            File file = new File(outFile);
            if (!file.exists()) {
                file.getParentFile().mkdirs();
                file.createNewFile();
            }
            FileOutputStream out = new FileOutputStream(file);
            out.write(Base64.getDecoder().decode(str));
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String buffer2hex(byte[] buffer) {
        String result = null;
        StringBuffer sb = new StringBuffer("");
        int i;
        for (int offset = 0; offset < buffer.length; offset++) {
            i = buffer[offset];
            if (i < 0)
                i += 256;
            if (i < 16)
                sb.append("0");
            sb.append(Integer.toHexString(i));
        }
        result = sb.toString();
        result = result.toUpperCase();
        return result;
    }

    private static byte[] hex2buffer(byte[] buffer) {

        if ((buffer.length % 2) != 0)

            throw new IllegalArgumentException("长度不是偶数");

        byte[] b2 = new byte[buffer.length / 2];

        for (int n = 0; n < buffer.length; n += 2) {

            String item = new String(buffer, n, 2);

            b2[n / 2] = (byte) Integer.parseInt(item, 16);

        }

        return b2;
    }

    public static byte[] intToByteArray(int i) {
        return new byte[]{
                (byte) (i & 0xFF),
                (byte) ((i >> 8) & 0xFF),
                (byte) ((i >> 16) & 0xFF),
                (byte) ((i >> 24) & 0xFF)
        };
    }

    public static String MD5String(byte[] buffer) {
        String result = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(buffer);
            result = buffer2hex(md.digest());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public static String MD5String(ByteBuffer buffer) {
        String result = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(buffer);
            result = buffer2hex(md.digest());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }


    public static String MD5String(String s) {
        return MD5String(s.getBytes());

    }


    public static String MD5String(int i) {
        return MD5String(intToByteArray(i));

    }


    public static String MD5String(File file) throws FileNotFoundException, IOException {
        FileInputStream in = new FileInputStream(file);
        FileChannel ch = in.getChannel();
        MappedByteBuffer ByteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
        in.close();
        return MD5String(ByteBuffer);
    }


    private static String Des(String data, String key, int opmode) {
        String algorithm = "DES";
        try {
            SecureRandom Random = new SecureRandom();
            DESKeySpec keySpec = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(algorithm);
            SecretKey securekey = keyFactory.generateSecret(keySpec);

            Cipher cipher = Cipher.getInstance(algorithm);
            cipher.init(opmode, securekey, Random);
            switch (opmode) {
                case Cipher.ENCRYPT_MODE:
                    // return
                    // EncodeBase64(buffer2hex(cipher.doFinal(data.getBytes()))) ;
                    return buffer2hex(cipher.doFinal(data.getBytes()));
                case Cipher.DECRYPT_MODE:
                    // return new
                    // String(cipher.doFinal(hex2buffer(Base64.getDecoder().decode(data.getBytes()))));
                    return new String(cipher.doFinal(hex2buffer(data.getBytes())));
                default:
                    return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String DesEncode(String data, String key) {
        return Des(data, key, Cipher.ENCRYPT_MODE);
    }

    public static String DesDecode(String data, String key) {
        String result = null;
        result = Des(data, key, Cipher.DECRYPT_MODE);

        return result;
    }

    public static String hsEnctypt(String data) {
        String result = DesEncode(data, MD5String(key));
        return result;
    }

    public static String hsDectypt(String data) {
        String result = DesDecode(data, MD5String(key));
        return result;
    }
}

本文标签： 字符串文件工具filebyte