Android DES加密的CBC模式加密解密和ECB模式加密解密

DES加密共有四種模式：電子密碼本模式（ECB）、加密分組連結模式（CBC）、加密反饋模式（CFB）和輸出反饋模式（OFB）。 CBC模式加密： import java.security.Key;import java.security.spec.AlgorithmParameterSpec;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;import com.sun.org.apache.xml.internal.security.utils.Base64; public class DesCbcUtil {public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding"; /*** 加密* @param data 待加密字串* @param key 加密私密金鑰，長度不能夠小於8位* @return 加密後的位元組數組，一般結合Base64編碼使用* @throws CryptException 異常*/public static String encode(String key, String data) throws Exception {return encode(key, data.getBytes());} /*** 加密* @param data 待加密字串* @param key 加密私密金鑰，長度不能夠小於8位* @return 加密後的位元組數組，一般結合Base64編碼使用* @throws CryptException 異常*/public static String encode(String key, byte[] data) throws Exception {try { byte[] ivbyte = { 1, 2, 3, 4, 5, 6, 7, 8 }; DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// key的長度不能夠小於8位位元組Key secretKey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance(ALGORITHM_DES);IvParameterSpec iv = new IvParameterSpec(ivbyte);AlgorithmParameterSpec paramSpec = iv;cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec); byte[] bytes = cipher.doFinal(data); return Base64.encode(bytes);} catch (Exception e) {throw new Exception(e);}} /*** 解密* @param data 待解密字串* @param key 解密私密金鑰，長度不能夠小於8位* @return 解密後的位元組數組* @throws Exception 異常*/public static byte[] decode(String key, byte[] data) throws Exception {try {DESKeySpec dks = new DESKeySpec(key.getBytes());SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// key的長度不能夠小於8位位元組Key secretKey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance(ALGORITHM_DES);IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());AlgorithmParameterSpec paramSpec = iv;cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);return cipher.doFinal(data);} catch (Exception e) {throw new Exception(e);}} /*** 擷取編碼後的值* * @param key* @param data* @return* @throws Exception*/public static String decodeValue(String key, String data) {byte[] datas;String value = null;try {if (System.getProperty("os.name") != null&& (System.getProperty("os.name").equalsIgnoreCase("sunos") || System.getProperty("os.name").equalsIgnoreCase("linux"))) {datas = decode(key, Base64.decode(data));} else {datas = decode(key, Base64.decode(data));} value = new String(datas);} catch (Exception e) {value = "";}return value;} }ECB模式加密： import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import android.util.Base64; public class DesEcbUtil { public static final String ALGORITHM_DES = "DES/ECB/PKCS5Padding"; /*** 加密* @param data 待加密字串* @param key 加密私密金鑰，長度不能夠小於8位* @return 加密後的位元組數組，一般結合Base64編碼使用* @throws CryptException  異常*/public static String encode(String key, String data) throws Exception {return encode(key, data.getBytes());} /*** 加密* @param data 待加密字串* @param key 加密私密金鑰，長度不能夠小於8位* @return 加密後的位元組數組，一般結合Base64編碼使用* @throws CryptException 異常*/public static String encode(String key, byte[] data) throws Exception {try {DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// key的長度不能夠小於8位位元組Key secretKey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance(ALGORITHM_DES);cipher.init(Cipher.ENCRYPT_MODE, secretKey); byte[] bytes = cipher.doFinal(data); return Base64.encodeToString(bytes, 3);} catch (Exception e) {throw new Exception(e);}} /*** 解密* @param data 待解密字串* @param key 解密私密金鑰，長度不能夠小於8位* @return 解密後的位元組數組* @throws Exception 異常*/public static byte[] decode(String key, byte[] data) throws Exception {try {DESKeySpec dks = new DESKeySpec(key.getBytes());SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// key的長度不能夠小於8位位元組Key secretKey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance(ALGORITHM_DES);cipher.init(Cipher.DECRYPT_MODE, secretKey);return cipher.doFinal(data);} catch (Exception e) {throw new Exception(e);}} /*** 擷取編碼後的值* * @param key* @param data* @return* @throws Exception*/public static String decodeValue(String key, String data) {byte[] datas;String value = null;try {if (System.getProperty("os.name") != null&& (System.getProperty("os.name").equalsIgnoreCase("sunos") || System.getProperty("os.name").equalsIgnoreCase("linux"))) {datas = decode(key, Base64.decode(data, 3));} else {datas = decode(key, Base64.decode(data, 3));} value = new String(datas);} catch (Exception e) {value = "";}return value;}}測試（CBC模式的測試和ECB的一樣）：try {//待加密內容urlString str = ""; String pwdKey = "moshapp"; String pwdKeyMD5 = MD5Util.encode(pwdKey);System.out.println("pwdKeyMD5：" + pwdKeyMD5);String encodeStr = DesEcbUtil.encode(pwdKeyMD5, str);String decodeStr = DesEcbUtil.decodeValue(pwdKeyMD5, encodeStr);System.out.println("加密前的字串：" + str);System.out.println("加密後的字串：" + encodeStr);System.out.println("解密後的字串：" + decodeStr);// URL轉義final String encodedURL = URLEncoder.encode(encodeStr, "UTF-8");// URL urlStr = new URL(encodedURL);System.out.println("轉義後的字串：" + encodedURL);} catch (Exception e) {e.printStackTrace();}