security - How to generate PublicKey from String Java -


i have public key string 

string publick = "-----begin public key-----\n" +     "miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqeagfhtdtuyj5g5lehmesnf\n" +     "wx9cxz1b/ozkkpbgtc3zietifkofncbpcskpdbpmxxxv3vrwj2rqil2lzlzpe1xt\n" +     "ayqy1ddd8hgqiemmwv2nqffoeomvl5+qoakcrihkggte6a2+ootk9jzrp/nvapkb\n" +     "sdx1/niperyen3udvusyq83ite2odyazzxj+/r46sads/g5jwmeqgvoinjw813y7\n" +     "ee2hgyvbnktllnhqigj+1okmwop+gp7kk5cakt9fo4vjrrlldax1yfczebdl254n\n" +     "s+lvohl4mlbm8764+yvxjyyrc1nq2rnzfq602652i+l8u8ngqdikokdpjndvhonp\n" +     "yqidaqab\n" +     "-----end public key-----";

i want convert publickey object . 

byte[] bytekey = publick.getbytes(); x509encodedkeyspec spec = new x509encodedkeyspec(bytekey); keyfactory kf = keyfactory.getinstance("rsa"); return kf.generatepublic(spec);

above code throws exception 

java.security.invalidkeyexception: invalid key format @ sun.security.x509.x509key.decode(x509key.java:387) @ sun.security.x509.x509key.decode(x509key.java:403) @ sun.security.rsa.rsapublickeyimpl.<init>(rsapublickeyimpl.java:84) @ sun.security.rsa.rsakeyfactory.generatepublic(rsakeyfactory.java:298) @ sun.security.rsa.rsakeyfactory.enginegeneratepublic(rsakeyfactory.java:201)

your key base64 encoded pem format. have remove strings first, decode , can use keyfactory.

    string publick = "-----begin public key-----\n"             + "miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqeagfhtdtuyj5g5lehmesnf\n"             + "wx9cxz1b/ozkkpbgtc3zietifkofncbpcskpdbpmxxxv3vrwj2rqil2lzlzpe1xt\n"             + "ayqy1ddd8hgqiemmwv2nqffoeomvl5+qoakcrihkggte6a2+ootk9jzrp/nvapkb\n"             + "sdx1/niperyen3udvusyq83ite2odyazzxj+/r46sads/g5jwmeqgvoinjw813y7\n"             + "ee2hgyvbnktllnhqigj+1okmwop+gp7kk5cakt9fo4vjrrlldax1yfczebdl254n\n"             + "s+lvohl4mlbm8764+yvxjyyrc1nq2rnzfq602652i+l8u8ngqdikokdpjndvhonp\n" + "yqidaqab\n"             + "-----end public key-----";      string pubkeypem = publick.replace("-----begin public key-----\n", "").replace("-----end public key-----", "");      // base64 decode data      byte[] encodedpublickey = base64.decode(pubkeypem);      x509encodedkeyspec spec = new x509encodedkeyspec(encodedpublickey);     keyfactory kf = keyfactory.getinstance("rsa");     system.out.println(kf.generatepublic(spec));

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