RSA根据modulus,exponent生成公钥

public static PublicKey getPublicKey(String modulus, String publicExponent)

           throws NoSuchAlgorithmException, InvalidKeySpecException {

       BigInteger bigIntModulus = new BigInteger(modulus,16);

       BigInteger bigIntPrivateExponent = new BigInteger(publicExponent,16);

       RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent);

       KeyFactory keyFactory = KeyFactory.getInstance("RSA");
       PublicKey publicKey = keyFactory.generatePublic(keySpec);

       return publicKey;

   }