首先,我是一名初学者程序员。我在用户端(Android)创建了一对密钥(RSA)。我打算将公钥作为Base64字符串发送到服务器,以备将来使用,并使用公钥对下一个数据进行编码并将其发送给用户。我使用的是Node.js的服务器端。不幸的是,互联网上所有的内容都没有提到如何用Base64公钥加密,或者至少我没有看到。有人可以帮帮我吗?谢谢。
这是我的Java代码:
这是我的Java代码:
public class GenKey {
private String stringPrivateKey;
private String stringPublicKey;
@RequiresApi(api = Build.VERSION_CODES.O)
public GenKey() throws NoSuchAlgorithmException {
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(512,new SecureRandom());//1024 or 2048
KeyPair kp = kpg.generateKeyPair();
PublicKey publicKey = kp.getPublic();
PrivateKey privateKey = kp.getPrivate();
this.stringPublicKey = Base64.encodeToString(publicKey.getEncoded(), DEFAULT);
this.stringPrivateKey =Base64.encodeToString(privateKey.getEncoded(), DEFAULT);
}
public String getPublicKey(){
return stringPublicKey;
}
public String getPrivateKey(){
return stringPrivateKey;
}
}
以及:
public class EncryptDecrypt {
public static String encrypt(String publicKey, String cleartext) throws Exception {
X509EncodedKeySpec ks = new X509EncodedKeySpec(Base64.decode(publicKey,DEFAULT));
KeyFactory kf = KeyFactory.getInstance("RSA");
PublicKey pub = kf.generatePublic(ks);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pub);
byte[] encMsgBinary = cipher.doFinal(cleartext.getBytes());
return Base64.encodeToString(encMsgBinary, DEFAULT);
}
public static String decrypt(String privateKey, String ciphertext) throws Exception {
PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(Base64.decode(privateKey,DEFAULT));
KeyFactory kf = KeyFactory.getInstance("RSA");
PrivateKey pvt = kf.generatePrivate(ks);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, pvt);
byte [] encrypted = Base64.decode(ciphertext,DEFAULT);
return new String(cipher.doFinal(encrypted));
}
}