android - Key from String in Java RSA -

i using in app rsa cryptography. store generated public key convert string , save in database.

    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 publick , privatek. problem is, when want encrypt/decrypt text rsa , use saved key in string format don't know how convert 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 have idea? lot

to convert publick(string) public key below :

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) private key below :

byte[] keybytes = base64.decode(privatek.getbytes("utf-8")); pkcs8encodedkeyspec keyspec = new pkcs8encodedkeyspec(keybytes); keyfactory fact = keyfactory.getinstance("rsa"); privatekey priv = fact.generateprivate(keyspec);