帮忙看看，自己写的加密算法，有乱码问题

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帮忙看看，自己写的加密算法，有乱码问题5

private boolean encryptFile(String oldFile, String newFile) throws Exception {
        // 动态生成锁
        KEYVALUE = getRandomString().getBytes();

        FileInputStream in = new FileInputStream(oldFile);

        File file = new File(newFile);
        if (!file.exists())
            file.createNewFile();
        FileOutputStream out = new FileOutputStream(file);

        // 把锁放到文件头
        out.write(KEYVALUE);

        // 其他部分开始加密
        int c, pos, keylen, myFlag;
        myFlag = 0;
        pos = 0;
        keylen = KEYVALUE.length;
        byte buffer[] = new byte[BUFFERLEN];
        while ((c = in.read(buffer)) != -1) {
            if (myFlag++ == 0) {
                for (int i = 0; i < c; i++) {
                    buffer[i] ^= KEYVALUE[pos];
                    out.write(buffer[i]);
                    pos++;
                    if (pos == keylen)
                        pos = 0;
                }
            } else {
                out.write(buffer, 0, c);
            }
        }
        out.flush();
        in.close();
        out.close();
        
        return true;
    }
    

    private byte[] decryptFile(String oldFile) throws Exception {
        FileInputStream in = new FileInputStream(oldFile);

        List<byte[]> tmpBuffer = new ArrayList<byte[]>();

        byte[] tmpB = new byte[prefixLength];
        // 先取出来锁
        in.read(tmpB, 0, prefixLength);
        KEYVALUE = tmpB;

        int c, pos, keylen, myFlag;
        myFlag = 0;
        pos = 0;
        keylen = KEYVALUE.length;
        byte buffer[] = new byte[BUFFERLEN];
        while ((c = in.read(buffer)) != -1) {
            if (myFlag++ == 0) {
                byte[] tmpbuffer_2 = new byte[buffer.length];
                for (int i = 0; i < c; i++) {
                    buffer[i] ^= KEYVALUE[pos];
                    tmpbuffer_2[i] = buffer[i];
                    pos++;
                    if (pos == keylen)
                        pos = 0;
                }

                tmpBuffer.add(tmpbuffer_2);
            } else {
                tmpBuffer.add(buffer);
            }
        }
        in.close();

        byte[] all = new byte[1024];
        int maxsize = 0;
        for (byte[] b : tmpBuffer) {
            maxsize += b.length;
            if (all.length > maxsize) {
                System.arraycopy(b, 0, all, maxsize - b.length, b.length);
            } else {
                byte[] tempAll = new byte[all.length + 512];
                System.arraycopy(all, 0, tempAll, 0, all.length);
                all = tempAll;
                System.arraycopy(b, 0, all, maxsize - b.length, b.length);
            }
        }

        return all;
    }