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Java加密工具类非原创
1 import java.security.InvalidKeyException; 2 import java.security.NoSuchAlgorithmException; 3 import java.security.Security; 4 5 import javax.crypto.BadPaddingException; 6 import javax.crypto.Cipher; 7 import javax.crypto.IllegalBlockSizeException; 8 import javax.crypto.KeyGenerator; 9 import javax.crypto.NoSuchPaddingException; 10 import javax.crypto.SecretKey; 11 12 public class EncrypAES { 13 14 //KeyGenerator 提供对称密钥生成器的功能，支持各种算法 15 private KeyGenerator keygen; 16 //SecretKey 负责保存对称密钥 17 private SecretKey deskey; 18 //Cipher负责完成加密或解密工作 19 private Cipher c; 20 //该字节数组负责保存加密的结果 21 private byte[] cipherByte; 22 23 public EncrypAES() throws NoSuchAlgorithmException, NoSuchPaddingException{ 24 Security.addProvider(new com.sun.crypto.provider.SunJCE()); 25 //实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常) 26 keygen = KeyGenerator.getInstance("AES"); 27 //生成密钥 28 deskey = keygen.generateKey(); 29 //生成Cipher对象,指定其支持的DES算法 30 c = Cipher.getInstance("AES"); 31 } 32 33 /**34 * 对字符串加密35 * 36 * @param str37 * @return38 * @throws InvalidKeyException39 * @throws IllegalBlockSizeException40 * @throws BadPaddingException41 */ 42 public byte[] Encrytor(String str) throws InvalidKeyException, 43 IllegalBlockSizeException, BadPaddingException { 44 // 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式 45 c.init(Cipher.ENCRYPT_MODE, deskey); 46 byte[] src =http://www.mamicode.com/ str.getBytes(); 47 // 加密，结果保存进cipherByte 48 cipherByte = c.doFinal(src); 49 return cipherByte; 50 } 51 52 /**53 * 对字符串解密54 * 55 * @param buff56 * @return57 * @throws InvalidKeyException58 * @throws IllegalBlockSizeException59 * @throws BadPaddingException60 */ 61 public byte[] Decryptor(byte[] buff) throws InvalidKeyException, 62 IllegalBlockSizeException, BadPaddingException { 63 // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式 64 c.init(Cipher.DECRYPT_MODE, deskey); 65 cipherByte = c.doFinal(buff); 66 return cipherByte; 67 } 68 69 /**70 * @param args71 * @throws NoSuchPaddingException 72 * @throws NoSuchAlgorithmException 73 * @throws BadPaddingException 74 * @throws IllegalBlockSizeException 75 * @throws InvalidKeyException 76 */ 77 public static void main(String[] args) throws Exception { 78 EncrypAES de1 = new EncrypAES(); 79 String msg ="郭XX-搞笑相声全集"; 80 byte[] encontent = de1.Encrytor(msg); 81 byte[] decontent = de1.Decryptor(encontent); 82 System.out.println("明文是:" + msg); 83 System.out.println("加密后:" + new String(encontent)); 84 System.out.println("解密后:" + new String(decontent)); 85 } 86 87 }
1 import java.security.InvalidKeyException; 2 import java.security.NoSuchAlgorithmException; 3 import java.security.Security; 4 5 import javax.crypto.BadPaddingException; 6 import javax.crypto.Cipher; 7 import javax.crypto.IllegalBlockSizeException; 8 import javax.crypto.KeyGenerator; 9 import javax.crypto.NoSuchPaddingException; 10 import javax.crypto.SecretKey; 11 12 public class EncrypDES { 13 14 //KeyGenerator 提供对称密钥生成器的功能，支持各种算法 15 private KeyGenerator keygen; 16 //SecretKey 负责保存对称密钥 17 private SecretKey deskey; 18 //Cipher负责完成加密或解密工作 19 private Cipher c; 20 //该字节数组负责保存加密的结果 21 private byte[] cipherByte; 22 23 public EncrypDES() throws NoSuchAlgorithmException, NoSuchPaddingException{ 24 Security.addProvider(new com.sun.crypto.provider.SunJCE()); 25 //实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常) 26 keygen = KeyGenerator.getInstance("DES"); 27 //生成密钥 28 deskey = keygen.generateKey(); 29 //生成Cipher对象,指定其支持的DES算法 30 c = Cipher.getInstance("DES"); 31 } 32 33 /**34 * 对字符串加密35 * 36 * @param str37 * @return38 * @throws InvalidKeyException39 * @throws IllegalBlockSizeException40 * @throws BadPaddingException41 */ 42 public byte[] Encrytor(String str) throws InvalidKeyException, 43 IllegalBlockSizeException, BadPaddingException { 44 // 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式 45 c.init(Cipher.ENCRYPT_MODE, deskey); 46 byte[] src =http://www.mamicode.com/ str.getBytes(); 47 // 加密，结果保存进cipherByte 48 cipherByte = c.doFinal(src); 49 return cipherByte; 50 } 51 52 /**53 * 对字符串解密54 * 55 * @param buff56 * @return57 * @throws InvalidKeyException58 * @throws IllegalBlockSizeException59 * @throws BadPaddingException60 */ 61 public byte[] Decryptor(byte[] buff) throws InvalidKeyException, 62 IllegalBlockSizeException, BadPaddingException { 63 // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式 64 c.init(Cipher.DECRYPT_MODE, deskey); 65 cipherByte = c.doFinal(buff); 66 return cipherByte; 67 } 68 69 /**70 * @param args71 * @throws NoSuchPaddingException 72 * @throws NoSuchAlgorithmException 73 * @throws BadPaddingException 74 * @throws IllegalBlockSizeException 75 * @throws InvalidKeyException 76 */ 77 public static void main(String[] args) throws Exception { 78 EncrypDES de1 = new EncrypDES(); 79 String msg ="郭XX-搞笑相声全集"; 80 byte[] encontent = de1.Encrytor(msg); 81 byte[] decontent = de1.Decryptor(encontent); 82 System.out.println("明文是:" + msg); 83 System.out.println("加密后:" + new String(encontent)); 84 System.out.println("解密后:" + new String(decontent)); 85 } 86 87 }
1 import java.security.InvalidKeyException; 2 import java.security.NoSuchAlgorithmException; 3 import java.security.Security; 4 5 import javax.crypto.BadPaddingException; 6 import javax.crypto.Cipher; 7 import javax.crypto.IllegalBlockSizeException; 8 import javax.crypto.KeyGenerator; 9 import javax.crypto.NoSuchPaddingException; 10 import javax.crypto.SecretKey; 11 12 public class EncrypDES3 { 13 14 // KeyGenerator 提供对称密钥生成器的功能，支持各种算法 15 private KeyGenerator keygen; 16 // SecretKey 负责保存对称密钥 17 private SecretKey deskey; 18 // Cipher负责完成加密或解密工作 19 private Cipher c; 20 // 该字节数组负责保存加密的结果 21 private byte[] cipherByte; 22 23 public EncrypDES3() throws NoSuchAlgorithmException, NoSuchPaddingException { 24 Security.addProvider(new com.sun.crypto.provider.SunJCE()); 25 // 实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常) 26 keygen = KeyGenerator.getInstance("DESede"); 27 // 生成密钥 28 deskey = keygen.generateKey(); 29 // 生成Cipher对象,指定其支持的DES算法 30 c = Cipher.getInstance("DESede"); 31 } 32 33 /**34 * 对字符串加密35 * 36 * @param str37 * @return38 * @throws InvalidKeyException39 * @throws IllegalBlockSizeException40 * @throws BadPaddingException41 */ 42 public byte[] Encrytor(String str) throws InvalidKeyException, 43 IllegalBlockSizeException, BadPaddingException { 44 // 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式 45 c.init(Cipher.ENCRYPT_MODE, deskey); 46 byte[] src =http://www.mamicode.com/ str.getBytes(); 47 // 加密，结果保存进cipherByte 48 cipherByte = c.doFinal(src); 49 return cipherByte; 50 } 51 52 /**53 * 对字符串解密54 * 55 * @param buff56 * @return57 * @throws InvalidKeyException58 * @throws IllegalBlockSizeException59 * @throws BadPaddingException60 */ 61 public byte[] Decryptor(byte[] buff) throws InvalidKeyException, 62 IllegalBlockSizeException, BadPaddingException { 63 // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式 64 c.init(Cipher.DECRYPT_MODE, deskey); 65 cipherByte = c.doFinal(buff); 66 return cipherByte; 67 } 68 69 /**70 * @param args71 * @throws NoSuchPaddingException 72 * @throws NoSuchAlgorithmException 73 * @throws BadPaddingException 74 * @throws IllegalBlockSizeException 75 * @throws InvalidKeyException 76 */ 77 public static void main(String[] args) throws Exception { 78 EncrypDES3 des = new EncrypDES3(); 79 String msg ="郭XX-搞笑相声全集"; 80 byte[] encontent = des.Encrytor(msg); 81 byte[] decontent = des.Decryptor(encontent); 82 System.out.println("明文是:" + msg); 83 System.out.println("加密后:" + new String(encontent)); 84 System.out.println("解密后:" + new String(decontent)); 85 86 } 87 88 }
1 import java.security.MessageDigest; 2 import java.security.NoSuchAlgorithmException; 3 4 public class EncrypMD5 { 5 6 public byte[] eccrypt(String info) throws NoSuchAlgorithmException{ 7 //根据MD5算法生成MessageDigest对象 8 MessageDigest md5 = MessageDigest.getInstance("MD5"); 9 byte[] srcBytes = info.getBytes(); 10 //使用srcBytes更新摘要 11 md5.update(srcBytes); 12 //完成哈希计算，得到result 13 byte[] resultBytes = md5.digest(); 14 return resultBytes; 15 } 16 17 18 public static void main(String args[]) throws NoSuchAlgorithmException{ 19 String msg = "郭XX-精品相声技术"; 20 EncrypMD5 md5 = new EncrypMD5(); 21 byte[] resultBytes = md5.eccrypt(msg); 22 23 System.out.println("密文是：" + new String(resultBytes)); 24 System.out.println("明文是：" + msg); 25 } 26 27 }
1 import java.security.InvalidKeyException; 2 import java.security.KeyPair; 3 import java.security.KeyPairGenerator; 4 import java.security.NoSuchAlgorithmException; 5 import java.security.interfaces.RSAPrivateKey; 6 import java.security.interfaces.RSAPublicKey; 7 8 import javax.crypto.BadPaddingException; 9 import javax.crypto.Cipher; 10 import javax.crypto.IllegalBlockSizeException; 11 import javax.crypto.NoSuchPaddingException; 12 13 public class EncrypRSA { 14 15 /**16 * 加密17 * @param publicKey18 * @param srcBytes19 * @return20 * @throws NoSuchAlgorithmException21 * @throws NoSuchPaddingException22 * @throws InvalidKeyException23 * @throws IllegalBlockSizeException24 * @throws BadPaddingException25 */ 26 protected byte[] encrypt(RSAPublicKey publicKey,byte[] srcBytes) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException{ 27 if(publicKey!=null){ 28 //Cipher负责完成加密或解密工作，基于RSA 29 Cipher cipher = Cipher.getInstance("RSA"); 30 //根据公钥，对Cipher对象进行初始化 31 cipher.init(Cipher.ENCRYPT_MODE, publicKey); 32 byte[] resultBytes = cipher.doFinal(srcBytes); 33 return resultBytes; 34 } 35 return null; 36 } 37 38 /**39 * 解密 40 * @param privateKey41 * @param srcBytes42 * @return43 * @throws NoSuchAlgorithmException44 * @throws NoSuchPaddingException45 * @throws InvalidKeyException46 * @throws IllegalBlockSizeException47 * @throws BadPaddingException48 */ 49 protected byte[] decrypt(RSAPrivateKey privateKey,byte[] srcBytes) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException{ 50 if(privateKey!=null){ 51 //Cipher负责完成加密或解密工作，基于RSA 52 Cipher cipher = Cipher.getInstance("RSA"); 53 //根据公钥，对Cipher对象进行初始化 54 cipher.init(Cipher.DECRYPT_MODE, privateKey); 55 byte[] resultBytes = cipher.doFinal(srcBytes); 56 return resultBytes; 57 } 58 return null; 59 } 60 61 /**62 * @param args63 * @throws NoSuchAlgorithmException 64 * @throws BadPaddingException 65 * @throws IllegalBlockSizeException 66 * @throws NoSuchPaddingException 67 * @throws InvalidKeyException 68 */ 69 public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException { 70 EncrypRSA rsa = new EncrypRSA(); 71 String msg = "郭XX-精品相声"; 72 //KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象 73 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA"); 74 //初始化密钥对生成器，密钥大小为1024位 75 keyPairGen.initialize(1024); 76 //生成一个密钥对，保存在keyPair中 77 KeyPair keyPair = keyPairGen.generateKeyPair(); 78 //得到私钥 79 RSAPrivateKey privateKey = (RSAPrivateKey)keyPair.getPrivate(); 80 //得到公钥 81 RSAPublicKey publicKey = (RSAPublicKey)keyPair.getPublic(); 82 83 //用公钥加密 84 byte[] srcBytes = msg.getBytes(); 85 byte[] resultBytes = rsa.encrypt(publicKey, srcBytes); 86 87 //用私钥解密 88 byte[] decBytes = rsa.decrypt(privateKey, resultBytes); 89 90 System.out.println("明文是:" + msg); 91 System.out.println("加密后是:" + new String(resultBytes)); 92 System.out.println("解密后是:" + new String(decBytes)); 93 } 94 95 }
1 import java.security.MessageDigest; 2 import java.security.NoSuchAlgorithmException; 3 4 public class EncrypSHA { 5 6 public byte[] eccrypt(String info) throws NoSuchAlgorithmException{ 7 MessageDigest md5 = MessageDigest.getInstance("SHA"); 8 byte[] srcBytes = info.getBytes(); 9 //使用srcBytes更新摘要 10 md5.update(srcBytes); 11 //完成哈希计算，得到result 12 byte[] resultBytes = md5.digest(); 13 return resultBytes; 14 } 15 16 /**17 * @param args18 * @throws NoSuchAlgorithmException 19 */ 20 public static void main(String[] args) throws NoSuchAlgorithmException { 21 String msg = "郭XX-精品相声技术"; 22 EncrypSHA sha = new EncrypSHA(); 23 byte[] resultBytes = sha.eccrypt(msg); 24 System.out.println("明文是：" + msg); 25 System.out.println("密文是：" + new String(resultBytes)); 26 27 } 28 29 }
Java加密工具类非原创
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