效果AES加密：加密前：test3444加密后：88E7373C834F8C1A505172F8BD33579A解密后：test3444
效果DES加密： 加密前： 要加密的字符串 test 加密后： pCpv76PEwJR/7bab04sKNdpzNvL7uHYE5AIfLjpNh2E= 解密后： 要加密的字符串 test
效果MD5加密： 加密前： 1989-03-03 加密后： CFCD208495D565EF66E7DFF9F98764DA
import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;public class AESTest{ /** * 加密 * * @param content 需要加密的内容 * @param password 加密密码 * @return */ public static byte[] encrypt(String content, String password) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(password.getBytes())); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES");// 创建密码器 byte[] byteContent = content.getBytes("utf-8"); cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化 byte[] result = cipher.doFinal(byteContent); return result; // 加密 } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; } /**解密 * @param content 待解密内容 * @param password 解密密钥 * @return */ public static byte[] decrypt(byte[] content, String password) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(password.getBytes())); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES");// 创建密码器 cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 byte[] result = cipher.doFinal(content); return result; // 加密 } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; } /**将二进制转换成16进制 * @param buf * @return */ public static String parseByte2HexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } /**将16进制转换为二进制 * @param hexStr * @return */ public static byte[] parseHexStr2Byte(String hexStr) { if (hexStr.length() < 1) return null; byte[] result = new byte[hexStr.length() / 2]; for (int i = 0; i < hexStr.length() / 2; i++) { int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16); int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16); result[i] = (byte)(high * 16 + low); } return result; } /** * @param args */ public static void main(String[] args) { String content = "test3444"; String password = "11"; // 加密 System.out.println("加密前：" + content); byte[] encryptResult = encrypt(content, password); String encryptResultStr = parseByte2HexStr(encryptResult); System.out.println("加密后：" + encryptResultStr); // 解密 byte[] decryptFrom = parseHexStr2Byte(encryptResultStr); byte[] decryptResult = decrypt(decryptFrom, password); System.out.println("解密后：" + new String(decryptResult)); }} DES import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.CipherOutputStream; import javax.crypto.KeyGenerator; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class DESUtil { Key key ; public DESUtil() { } public DESUtil(String str) { setKey(str); // 生成密匙 } public Key getKey() { return key ; } public void setKey(Key key) { this . key = key; } /** * 根据参数生成 KEY */ public void setKey(String strKey) { try { KeyGenerator _generator = KeyGenerator.getInstance ( "DES" ); _generator.init( new SecureRandom(strKey.getBytes())); this . key = _generator.generateKey(); _generator = null ; } catch (Exception e) { throw new RuntimeException( "Error initializing SqlMap class. Cause: " + e); } } /** * 加密 String 明文输入 ,String 密文输出 */ public String encryptStr(String strMing) { byte [] byteMi = null ; byte [] byteMing = null ; String strMi = "" ; BASE64Encoder base64en = new BASE64Encoder(); try { byteMing = strMing.getBytes( "UTF8" ); byteMi = this .encryptByte(byteMing); strMi = base64en.encode(byteMi); } catch (Exception e) { throw new RuntimeException( "Error initializing SqlMap class. Cause: " + e); } finally { base64en = null ; byteMing = null ; byteMi = null ; } return strMi; } /** * 解密 以 String 密文输入 ,String 明文输出 * * @param strMi * @return */ public String decryptStr(String strMi) { BASE64Decoder base64De = new BASE64Decoder(); byte [] byteMing = null ; byte [] byteMi = null ; String strMing = "" ; try { byteMi = base64De.decodeBuffer(strMi); byteMing = this .decryptByte(byteMi); strMing = new String(byteMing, "UTF8" ); } catch (Exception e) { throw new RuntimeException( "Error initializing SqlMap class. Cause: " + e); } finally { base64De = null ; byteMing = null ; byteMi = null ; } return strMing; } /** * 加密以 byte[] 明文输入 ,byte[] 密文输出 * * @param byteS * @return */ private byte [] encryptByte( byte [] byteS) { byte [] byteFina = null ; Cipher cipher; try { cipher = Cipher.getInstance ( "DES" ); cipher.init(Cipher. ENCRYPT_MODE , key ); byteFina = cipher.doFinal(byteS); } catch (Exception e) { throw new RuntimeException( "Error initializing SqlMap class. Cause: " + e); } finally { cipher = null ; } return byteFina; } /** * 解密以 byte[] 密文输入 , 以 byte[] 明文输出 * * @param byteD * @return */ private byte [] decryptByte( byte [] byteD) { Cipher cipher; byte [] byteFina = null ; try { cipher = Cipher.getInstance ( "DES" ); cipher.init(Cipher. DECRYPT_MODE , key ); byteFina = cipher.doFinal(byteD); } catch (Exception e) { throw new RuntimeException( "Error initializing SqlMap class. Cause: " + e); } finally { cipher = null ; } return byteFina; } /** * 文件 file 进行加密并保存目标文件 destFile 中 * * @param file * 要加密的文件 如 c:/test/srcFile.txt * @param destFile * 加密后存放的文件名 如 c:/ 加密后文件 .txt */ public void encryptFile(String file, String destFile) throws Exception { Cipher cipher = Cipher.getInstance ( "DES" ); // cipher.init(Cipher.ENCRYPT_MODE, getKey()); cipher.init(Cipher. ENCRYPT_MODE , this . key ); InputStream is = new FileInputStream(file); OutputStream out = new FileOutputStream(destFile); CipherInputStream cis = new CipherInputStream(is, cipher); byte [] buffer = new byte [1024]; int r; while ((r = cis.read(buffer)) > 0) { out.write(buffer, 0, r); } cis.close(); is.close(); out.close(); } /** * 文件采用 DES 算法解密文件 * * @param file * 已加密的文件 如 c:/ 加密后文件 .txt * * @param destFile * 解密后存放的文件名 如 c:/ test/ 解密后文件 .txt */ public void decryptFile(String file, String dest) throws Exception { Cipher cipher = Cipher.getInstance ( "DES" ); cipher.init(Cipher. DECRYPT_MODE , this . key ); InputStream is = new FileInputStream(file); OutputStream out = new FileOutputStream(dest); CipherOutputStream cos = new CipherOutputStream(out, cipher); byte [] buffer = new byte [1024]; int r; while ((r = is.read(buffer)) >= 0) { cos.write(buffer, 0, r); } cos.close(); out.close(); is.close(); } public static void main(String[] args) throws Exception { DESUtil des = new DESUtil( "" ); // DES 加密文件 // des.encryptFile("G:/test.doc", "G:/ 加密 test.doc"); // DES 解密文件 // des.decryptFile("G:/ 加密 test.doc", "G:/ 解密 test.doc"); String str1 = " 要加密的字符串 test" ; // DES 加密字符串 String str2 = des.encryptStr(str1); // DES 解密字符串 String deStr = des.decryptStr(str2); System. out .println( " 加密前： " + str1); System. out .println( " 加密后： " + str2); System. out .println( " 解密后： " + deStr); } }
MD5：
public class PwdDigest { public static void main(String[] args){passwordDigest("0");} /** * @param myinfo * 为字符串加密 * @return */ public static String passwordDigest(String myinfo) { String newPwd = "1989-03-03"; try { java.security.MessageDigest alga=java.security.MessageDigest.getInstance("MD5"); // java.security.MessageDigest alga = java.security.MessageDigest.getInstance("SHA-1"); alga.update(myinfo.getBytes()); byte[] digesta = alga.digest(); newPwd = byte2hex(digesta); System.out.println(newPwd); } catch (java.security.NoSuchAlgorithmException e) { System.out.println("密码加密异常：非法摘要算法"+e); // Loggers.error("密码加密异常：非法摘要算法"+e); } return newPwd; } public static String byte2hex(byte[] b) // 二行制转字符串 { String hs = ""; String stmp = ""; for (int n = 0; n < b.length; n++) { stmp = (java.lang.Integer.toHexString(b[n] & 0XFF)); if (stmp.length() == 1){ hs = hs + "0" + stmp; }else{ hs = hs + stmp; } } return hs.toUpperCase(); } }
