RSA非对称加密算法

import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.PrivateKey; import java.security.PublicKey; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;

/**

• 非对称加密 唯一广泛接受并实现 数据加密&数字签名 公钥加密、私钥解密 私钥加密、公钥解密

• @author jjs * */ public class RSADemo {

  private static String src = "infcn";

  private static RSAPublicKey rsaPublicKey; private static RSAPrivateKey rsaPrivateKey;

  static { // 1、初始化密钥 KeyPairGenerator keyPairGenerator; try { keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(512);// 64的整倍数 KeyPair keyPair = keyPairGenerator.generateKeyPair(); rsaPublicKey = (RSAPublicKey) keyPair.getPublic(); rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate(); System.out.println("Public Key : " + Base64.encodeBase64String(rsaPublicKey.getEncoded())); System.out.println("Private Key : " + Base64.encodeBase64String(rsaPrivateKey.getEncoded())); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } }

  /**

  • 公钥加密，私钥解密

  • @author jijs */ public static void pubEn2PriDe() { //公钥加密 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded()); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] result = cipher.doFinal(src.getBytes()); System.out.println("公钥加密，私钥解密 --加密: " + Base64.encodeBase64String(result));

    //私钥解密 PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded()); keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec); cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); result = cipher.doFinal(result); System.out.println("公钥加密，私钥解密 --解密: " + new String(result)); }

  /**

  • 私钥加密，公钥解密

  • @author jijs */ public static void priEn2PubDe() {

    //私钥加密 PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded()); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, privateKey); byte[] result = cipher.doFinal(src.getBytes()); System.out.println("私钥加密，公钥解密 --加密 : " + Base64.encodeBase64String(result));

    //公钥解密 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded()); keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec); cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, publicKey); result = cipher.doFinal(result); System.out.println("私钥加密，公钥解密 --解密: " + new String(result)); }

  public static void main(String[] args) { pubEn2PriDe(); //公钥加密，私钥解密 priEn2PubDe(); //私钥加密，公钥解密 }

}