Java加密算法 RSA，java加密算法rsa,公钥加密也称为非对称加密

Java加密算法 RSA，java加密算法rsa,公钥加密也称为非对称加密

公钥加密也称为非对称加密、速度慢、加密和解密的钥匙不相同，某一个人持有私钥，任何人都可以知道公钥

import java.security.KeyPair;  import java.security.KeyPairGenerator;  import java.security.PrivateKey;  import java.security.PublicKey;  import java.util.Arrays;  import javax.crypto.Cipher;  /**  * RSA算法 公钥加密 非对称加密  * @author stone  * @date 2014-03-11 00:28:38  */  public class RSA {      public static final String KEY_ALGORITHM = "RSA";      public static final String CIPHER_ALGORITHM_ECB1 = "RSA/ECB/PKCS1Padding";      public static final String CIPHER_ALGORITHM_ECB2 = "RSA/ECB/OAEPWithSHA-1AndMGF1Padding"; //不能用      public static final String CIPHER_ALGORITHM_ECB3 = "OAEPWithSHA-256AndMGF1Padding"; //不能用      static PublicKey publicKey;      static PrivateKey privateKey;      static Cipher cipher;      static KeyPair keyPair;      public static void main(String[] args) throws Exception {          method1("斯柯达U*(Sfsad7f()*^%%$");          method2("斯柯达U*(Sfsad7f()*^%%$");          method3("斯柯达U*(Sfsad7f()*^%%$");      }      /**      * 公钥加密，私钥解密    使用默认CIPHER_ALGORITHM_ECB1      * @param str      * @throws Exception      */      static void method1(String str) throws Exception {          KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);          KeyPair keyPair = keyGenerator.generateKeyPair();          publicKey = keyPair.getPublic();          privateKey = keyPair.getPrivate();          cipher = Cipher.getInstance(KEY_ALGORITHM);          cipher.init(Cipher.ENCRYPT_MODE, publicKey); //公钥加密          byte[] encrypt = cipher.doFinal(str.getBytes());          System.out.println("公钥加密后1：" + Arrays.toString(encrypt));          cipher.init(Cipher.DECRYPT_MODE, privateKey);//私钥解密          byte[] decrypt = cipher.doFinal(encrypt);          System.out.println("私钥解密后1：" + new String(decrypt));      }      /**      * 私钥加密，公钥解密    使用默认CIPHER_ALGORITHM_ECB1      * @param str      * @throws Exception      */      static void method2(String str) throws Exception {          KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);          KeyPair keyPair = keyGenerator.generateKeyPair();          publicKey = keyPair.getPublic();          privateKey = keyPair.getPrivate();          cipher = Cipher.getInstance(KEY_ALGORITHM);          cipher.init(Cipher.ENCRYPT_MODE, privateKey); //私钥加密          byte[] encrypt = cipher.doFinal(str.getBytes());          System.out.println("私钥加密后2：" + Arrays.toString(encrypt));          cipher.init(Cipher.DECRYPT_MODE, publicKey);//公钥解密          byte[] decrypt = cipher.doFinal(encrypt);          System.out.println("公钥解密后2：" + new String(decrypt));      }      /**      * 私钥加密，公钥解密    使用CIPHER_ALGORITHM_ECB1 = RSA/ECB/PKCS1Padding      * @param str      * @throws Exception      */      static void method3(String str) throws Exception {          KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);          KeyPair keyPair = keyGenerator.generateKeyPair();          publicKey = keyPair.getPublic();          privateKey = keyPair.getPrivate();          cipher = Cipher.getInstance(CIPHER_ALGORITHM_ECB1);          cipher.init(Cipher.ENCRYPT_MODE, privateKey); //私钥加密          byte[] encrypt = cipher.doFinal(str.getBytes());          System.out.println("私钥加密后3：" + Arrays.toString(encrypt));          cipher.init(Cipher.DECRYPT_MODE, publicKey);//公钥解密          byte[] decrypt = cipher.doFinal(encrypt);          System.out.println("公钥解密后3：" + new String(decrypt));      }  }