java DES ECB模式对称加密解密
最近需要又要使用DES加密数据，要求DES加密出来的数据为对称加密，经过研究，发现了一些问题：
1.DES对称ECB模式加密的数据，长度必须为8的倍数
2.加密的数据，加密后先转码(因为加密后的数据我是转码了)，否则解密是乱码格式
一下是源代码：
这个是加密的工具类：
package com.palmfu.sql; import java.security.Key; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; /*** * DES ECB对称加密 解密 * @author spring sky * Email:[email protected] * QQ:840950105 * */ public class DesECBUtil { /** * 加密数据 * @param encryptString 注意：这里的数据长度只能为8的倍数 * @param encryptKey * @return * @throws Exception */ public static String encryptDES(String encryptString, String encryptKey) throws Exception { SecretKeySpec key = new SecretKeySpec(getKey(encryptKey), "DES"); Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] encryptedData = cipher.doFinal(encryptString.getBytes()); return ConvertUtil.bytesToHexString(encryptedData); } /** * 自定义一个key * @param string */ public static byte[] getKey(String keyRule) { Key key = null; byte[] keyByte = keyRule.getBytes(); // 创建一个空的八位数组,默认情况下为0 byte[] byteTemp = new byte[8]; // 将用户指定的规则转换成八位数组 for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) { byteTemp[i] = keyByte[i]; } key = new SecretKeySpec(byteTemp, "DES"); return key.getEncoded(); } /*** * 解密数据 * @param decryptString * @param decryptKey * @return * @throws Exception */ public static String decryptDES(String decryptString, String decryptKey) throws Exception { SecretKeySpec key = new SecretKeySpec(getKey(decryptKey), "DES"); Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding"); cipher.init(Cipher.DECRYPT_MODE, key); byte decryptedData[] = cipher.doFinal(ConvertUtil.hexStringToByte(decryptString)); return new String(decryptedData); } public static void main(String[] args) throws Exception { String clearText = "springsk"; //这里的数据长度必须为8的倍数 String key = "12345678"; System.out.println("明文："+clearText+"\n密钥："+key); String encryptText = encryptDES(clearText, key); System.out.println("加密后："+encryptText); String decryptText = decryptDES(encryptText, key); System.out.println("解密后："+decryptText); } }
转码工具类（包含MD5加密）
package com.palmfu.sql; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; /*** * 转码 MD5工具类 * @author spring sky * Email:[email protected] * QQ:840950105 * */ public final class ConvertUtil { public final static char[] BToA = "0123456789abcdef".toCharArray(); private ConvertUtil() { } /** * 把16进制字符串转换成字节数组 * * @param hex * @return */ public static byte[] hexStringToByte(String hex) { int len = (hex.length() / 2); byte[] result = new byte[len]; char[] achar = hex.toCharArray(); for (int i = 0; i < len; i++) { int pos = i * 2; result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1])); } return result; } private static byte toByte(char c) { byte b = (byte) "0123456789ABCDEF".indexOf(c); return b; } /** * 把字节数组转换成16进制字符串 * * @param bArray * @return */ public static final String bytesToHexString(byte[] bArray) { if(bArray == null ) { return ""; } StringBuffer sb = new StringBuffer(bArray.length); String sTemp; for (int i = 0; i < bArray.length; i++) { sTemp = Integer.toHexString(0xFF & bArray[i]); if (sTemp.length() < 2) sb.append(0); sb.append(sTemp.toUpperCase()); } return sb.toString(); } /** * 把字节数组转换为对象 * * @param bytes * @return * @throws IOException * @throws ClassNotFoundException */ public static final Object bytesToObject(byte[] bytes) throws IOException, ClassNotFoundException { ByteArrayInputStream in = new ByteArrayInputStream(bytes); ObjectInputStream oi = new ObjectInputStream(in); Object o = oi.readObject(); oi.close(); return o; } /** * 把可序列化对象转换成字节数组 * * @param s * @return * @throws IOException */ public static final byte[] objectToBytes(Serializable s) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); ObjectOutputStream ot = new ObjectOutputStream(out); ot.writeObject(s); ot.flush(); ot.close(); return out.toByteArray(); } public static final String objectToHexString(Serializable s) throws IOException { return bytesToHexString(objectToBytes(s)); } public static final Object hexStringToObject(String hex) throws IOException, ClassNotFoundException { return bytesToObject(hexStringToByte(hex)); } /** * @函数功能: BCD码转为10进制串(阿拉伯数据) * @输入参数: BCD码 * @输出结果: 10进制串 */ public static String bcd2Str(byte[] bytes) { StringBuffer temp = new StringBuffer(bytes.length * 2); for (int i = 0; i < bytes.length; i++) { temp.append((byte) ((bytes[i] & 0xf0) >>> 4)); temp.append((byte) (bytes[i] & 0x0f)); } return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp .toString().substring(1) : temp.toString(); } /** * @函数功能: 10进制串转为BCD码 * @输入参数: 10进制串 * @输出结果: BCD码 */ public static byte[] str2Bcd(String asc) { int len = asc.length(); int mod = len % 2; if (mod != 0) { asc = "0" + asc; len = asc.length(); } byte abt[] = new byte[len]; if (len >= 2) { len = len / 2; } byte bbt[] = new byte[len]; abt = asc.getBytes(); int j, k; for (int p = 0; p < asc.length() / 2; p++) { if ((abt[2 * p] >= '0') && (abt[2 * p] <= '9')) { j = abt[2 * p] - '0'; } else if ((abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) { j = abt[2 * p] - 'a' + 0x0a; } else { j = abt[2 * p] - 'A' + 0x0a; } if ((abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) { k = abt[2 * p + 1] - '0'; } else if ((abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) { k = abt[2 * p + 1] - 'a' + 0x0a; } else { k = abt[2 * p + 1] - 'A' + 0x0a; } int a = (j << 4) + k; byte b = (byte) a; bbt[p] = b; } return bbt; } public static String BCD2ASC(byte[] bytes) { StringBuffer temp = new StringBuffer(bytes.length * 2); for (int i = 0; i < bytes.length; i++) { int h = ((bytes[i] & 0xf0) >>> 4); int l = (bytes[i] & 0x0f); temp.append(BToA[h]).append(BToA[l]); } return temp.toString(); } /** * 两字符数组异或 */ public static byte[] byteArrXor(byte[] arr1, byte[] arr2, int len){ byte[] dest = new byte[len]; if((arr1.length < len) || (arr2.length < len)){ return null; } for(int i = 0;i < len;i++){ dest[i] = (byte)(arr1[i] ^ arr2[i]); } return dest; } /** * MD5加密字符串，返回加密后的16进制字符串 * @param origin * @return */ public static String MD5EncodeToHex(String origin) { return bytesToHexString(MD5Encode(origin)); } /** * MD5加密字符串，返回加密后的字节数组 * * @param origin * @return */ public static byte[] MD5Encode(String origin) { return MD5Encode(origin.getBytes()); } /** * MD5加密字节数组，返回加密后的字节数组 * * @param bytes * @return */ public static byte[] MD5Encode(byte[] bytes) { MessageDigest md = null; try { md = MessageDigest.getInstance("MD5"); return md.digest(bytes); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); return new byte[0]; } } }
以上DES 的ECB模式加密解密已经在android java平台测试，没有任何问题，而且已经和PHP后台互通了，请大家放心使用！如有问题，请联系我！
转载请保留spring sky 版权！