java+加密解密
EncrypAES
public class EncrypAES {
// KeyGenerator 提供对称密钥生成器的功能，支持各种算法
private KeyGenerator keygen;
// SecretKey 负责保存对称密钥
private SecretKey deskey;
// Cipher负责完成加密或解密工作
private Cipher c;
// 该字节数组负责保存加密的结果
private byte[] cipherByte;
public EncrypAES() throws NoSuchAlgorithmException, NoSuchPaddingException {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
// 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)
keygen = KeyGenerator.getInstance("DES");//
// 生成密钥
deskey = keygen.generateKey();
// 生成Cipher对象,指定其支持的DES算法
c = Cipher.getInstance("DES");
}
/**
* 对字符串加密
*/
public byte[] Encrytor(String str) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式
c.init(Cipher.ENCRYPT_MODE, deskey);
byte[] src = str.getBytes();
// 加密，结果保存进cipherByte
cipherByte = c.doFinal(src);
return cipherByte;
}
/**
* 对字符串解密
*/
public byte[] Decryptor(byte[] buff) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
c.init(Cipher.DECRYPT_MODE, deskey);
cipherByte = c.doFinal(buff);
return cipherByte;
}
}
EncrypEDS
public class EncrypDES {
// KeyGenerator 提供对称密钥生成器的功能，支持各种算法
private KeyGenerator keygen;
// SecretKey 负责保存对称密钥
private SecretKey deskey;
// Cipher负责完成加密或解密工作
private Cipher c;
// 该字节数组负责保存加密的结果
private byte[] cipherByte;
public EncrypDES() throws NoSuchAlgorithmException, NoSuchPaddingException {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
// 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)
keygen = KeyGenerator.getInstance("DES");
// 生成密钥
deskey = keygen.generateKey();
// 生成Cipher对象,指定其支持的DES算法
c = Cipher.getInstance("DES");
}
/**
* 对字符串加密
*/
public byte[] Encrytor(String str) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式
c.init(Cipher.ENCRYPT_MODE, deskey);
byte[] src = str.getBytes();
// 加密，结果保存进cipherByte
cipherByte = c.doFinal(src);
return cipherByte;
}
/**
* 对字符串解密
*/
public byte[] Decryptor(byte[] buff) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
c.init(Cipher.DECRYPT_MODE, deskey);
cipherByte = c.doFinal(buff);
return cipherByte;
}
}
EncrypDES3
public class EncrypDES3 {
// KeyGenerator 提供对称密钥生成器的功能，支持各种算法
private KeyGenerator keygen;
// SecretKey 负责保存对称密钥
private SecretKey deskey;
// Cipher负责完成加密或解密工作
private Cipher c;
// 该字节数组负责保存加密的结果
private byte[] cipherByte;
public EncrypDES3() throws NoSuchAlgorithmException, NoSuchPaddingException {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
// 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)
keygen = KeyGenerator.getInstance("DESede");
// 生成密钥
deskey = keygen.generateKey();
// 生成Cipher对象,指定其支持的DES算法
c = Cipher.getInstance("DESede");
}
/**
* 对字符串加密
*/
public byte[] Encrytor(String str) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式
c.init(Cipher.ENCRYPT_MODE, deskey);
byte[] src = str.getBytes();
// 加密，结果保存进cipherByte
cipherByte = c.doFinal(src);
return cipherByte;
}
/**
* 对字符串解密
*/
public byte[] Decryptor(byte[] buff) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
c.init(Cipher.DECRYPT_MODE, deskey);
cipherByte = c.doFinal(buff);
return cipherByte;
}
}
EncrypMD5
public class EncrypMD5 {
public byte[] eccrypt(String info) throws NoSuchAlgorithmException {
// 根据MD5算法生成MessageDigest对象
MessageDigest md5 = MessageDigest.getInstance("MD5");
byte[] srcBytes = info.getBytes();
// 使用srcBytes更新摘要
md5.update(srcBytes);
// 完成哈希计算，得到result
byte[] resultBytes = md5.digest();
return resultBytes;
}
}
EncrypRSA
public class EncrypRSA {
/**
* 加密
*/
protected byte[] encrypt(RSAPublicKey publicKey, byte[] srcBytes)
throws NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
if (publicKey != null) {
// Cipher负责完成加密或解密工作，基于RSA
Cipher cipher = Cipher.getInstance("RSA");
// 根据公钥，对Cipher对象进行初始化
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] resultBytes = cipher.doFinal(srcBytes);
return resultBytes;
}
return null;
}
/**
* 解密
*/
protected byte[] decrypt(RSAPrivateKey privateKey, byte[] srcBytes)
throws NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
if (privateKey != null) {
// Cipher负责完成加密或解密工作，基于RSA
Cipher cipher = Cipher.getInstance("RSA");
// 根据公钥，对Cipher对象进行初始化
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] resultBytes = cipher.doFinal(srcBytes);
return resultBytes;
}
return null;
}
/**
* @param args
*/
public static void main(String[] args) throws NoSuchAlgorithmException,
InvalidKeyException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException {
EncrypRSA rsa = new EncrypRSA();
String msg = "XX-";
// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
// 初始化密钥对生成器，密钥大小为1024位
keyPairGen.initialize(1024);
// 生成一个密钥对，保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
// 得到私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 得到公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
// 用公钥加密
byte[] srcBytes = msg.getBytes();
byte[] resultBytes = rsa.encrypt(publicKey, srcBytes);
// 用私钥解密
byte[] decBytes = rsa.decrypt(privateKey, resultBytes);
System.out.println("明文是:" + msg);
System.out.println("加密后是:" + new String(resultBytes));
System.out.println("解密后是:" + new String(decBytes));
}
}
EncrypSHA
public class EncrypSHA {
public byte[] eccrypt(String info) throws NoSuchAlgorithmException {
MessageDigest md5 = MessageDigest.getInstance("SHA");
byte[] srcBytes = info.getBytes();
// 使用srcBytes更新摘要
md5.update(srcBytes);
// 完成哈希计算，得到result
byte[] resultBytes = md5.digest();
return resultBytes;
}
}