Java RSA 中字符串的密钥
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Key from String in Java RSA
提问by rgreso
I am using in my app RSA cryptography. To store generated public key I convert it to String and then save it in database.
我在我的应用程序中使用 RSA 加密。为了存储生成的公钥，我将其转换为字符串，然后将其保存在数据库中。
Key publicKey=null;
Key privateKey=null;
KeyPair keyPair=RsaCrypto.getKeyPairRSA(1024);
publicKey=keyPair.getPublic();
privateKey=keyPair.getPrivate();
String publicK=Base64.encodeToString(publicKey.getEncoded(), Base64.DEFAULT);
String privateK=Base64.encodeToString(privateKey.getEncoded(), Base64.DEFAULT);
I save Strings publicKand privateK.
My problem is, when I want to encrypt/decrypt text with RSA and use my saved Key in String format I don't know how to convert it to Key.
我保存字符串publicK和privateK. 我的问题是，当我想用 RSA 加密/解密文本并以字符串格式使用我保存的密钥时，我不知道如何将其转换为Key.
public static String encrypt(Key publicKey, String inputText){
byte[]encodedBytes=null;
String encryptedText="";
try {
Cipher cipher=Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encodedBytes=cipher.doFinal(inputText.getBytes());
} catch (Exception e) {Log.e("Error", "RSA encryption error"); }
encryptedText=Base64.encodeToString(encodedBytes, Base64.DEFAULT);
return encryptedText;
}
Do you have any idea? Thanks a lot
你有什么主意吗？非常感谢
回答by Rahil2952
To convert publicK(String) to Public Key do as below :
要将 publicK(String) 转换为公钥，请执行以下操作：
byte[] keyBytes = Base64.decode(publicK.getBytes("utf-8"));
X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey key = keyFactory.generatePublic(spec);
To convert privateK(String) to Private Key do as below :
要将 privateK(String) 转换为私钥，请执行以下操作：
byte[] keyBytes = Base64.decode(privateK.getBytes("utf-8"));
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory fact = KeyFactory.getInstance("RSA");
PrivateKey priv = fact.generatePrivate(keySpec);
回答by Ysak
Could not able to comment on the previous post. I would like to know what is "clear" in
无法对之前的帖子发表评论。我想知道什么是“清晰”
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(clear);
回答by user3005339
I can only assume the line:
我只能假设这条线：
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(clear);
with "clear" was meant to be "keyBytes"
带有“clear”的意思是“keyBytes”
