我在我的应用程序中使用RSA加密.要存储生成的公钥,我将其转换为String,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);
我保存了Strings publicK和privateK.
我的问题是,当我想用RSA加密/解密文本并使用我保存的Key in String格式时,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;
}
你有什么主意吗？
非常感谢
解决方法
要将publicK(String)转换为Public Key,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);
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);