code: public static PublicKey generatePublicKey(BigInteger modulus, BigInteger publicExponent) {
  		return SecureUtil.generatePublicKey(ALGORITHM_RSA.getValue(), new RSAPublicKeySpec(modulus, publicExponent));
  	}
docs: 生成RSA公钥
  
  @param modulus N特征值
  @param publicExponent e特征值
  @return {@link PublicKey}