//加密字符串
String content = “JCccc-+你/好,我是需要被加密的内*容。”;
System.out.println(“加密前内容:”+content);
System.out.println(“随机生成的公钥为:” + keyMap.get(0));
System.out.println(“随机生成的私钥为:” + keyMap.get(1));
String messageEn = encrypt(content, keyMap.get(0));
System.out.println(“加密后的内容为:” + messageEn);
String messageDe = decrypt(messageEn, keyMap.get(1));
System.out.println(“还原后的内容为:” + messageDe);
}
//随机生成密钥对
public static Map genKeyPair() {
// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
KeyPairGenerator keyPairGen = null;
try {
keyPairGen = KeyPairGenerator.getInstance(“RSA”);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
// 初始化密钥对生成器，密钥大小为96-1024位
assert keyPairGen != null;
keyPairGen.initialize(102
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4, new SecureRandom());
// 生成一个密钥对，保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥
String publicKeyString = new String(base64.encodebase64(publicKey.getEncoded()));
// 得到私钥字符串
String privateKeyString = new String(base64.encodebase64((privateKey.getEncoded())));
// 将公钥和私钥保存到Map
Map
keyMap.put(0, publicKeyString); //0表示公钥
keyMap.put(1, privateKeyString); //1表示私钥
return keyMap;
}
public static String encrypt(String str, String publicKey) {
//base64编码的公钥
byte[] decoded = base64.decodebase64(publicKey);
RSAPublicKey pubKey = null;
String outStr = null;
try {
pubKey = (RSAPublicKey) KeyFactory.getInstance(“RSA”).generatePublic(new X509EncodedKeySpec(decoded));
Cipher cipher = Cipher.getInstance(“RSA”);
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
outStr = base64.encodebase64String(cipher.doFinal(str.getBytes(StandardCharsets.UTF_8)));
} catch (InvalidKeySpecException | BadPaddingException | IllegalBlockSizeException | InvalidKeyException | NoSuchPaddingException | NoSuchAlgorithmException e) {
e.printStackTrace();
}
//RSA加密
return outStr;
}
public static String decrypt(String str, String privateKey) {
//64位解码加密后的字符串
byte[] inputByte = base64.decodebase64(str.getBytes(StandardCharsets.UTF_8));
//base64编码的私钥
byte[] decoded = base64.decodebase64(privateKey);
RSAPrivateKey priKey = null;
//RSA解密
Cipher cipher = null;
String outStr = null;
try {
priKey = (RSAPrivateKey) KeyFactory.getInstance(“RSA”).generatePrivate(new PKCS8EncodedKeySpec(decoded));
cipher = Cipher.getInstance(“RSA”);
cipher.init(Cipher.DECRYPT_MODE, priKey);
outStr = new String(cipher.doFinal(inputByte));
} catch (InvalidKeySpecException | NoSuchAlgorithmException | NoSuchPaddingException | BadPaddingException | IllegalBlockSizeException | InvalidKeyException e) {
e.printStackTrace();
}
return outStr;
