RSA modulus has a small prime factor

Question

c# 将java 生成的rsa公钥 转换为xml格式时报错：RSA modulus has a small prime factor

这是我的转换代码：

        /// 
 
        /// RSA公钥格式转换，java->.net
        /// 
        /// <param name="publicKey">java生成的公钥</param>
        /// <returns></returns>
        public static string RSAPublicKeyJava2DotNet(string publicKey)
        {
            RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
            return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
            Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
            Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
        }

这个公钥我再java中测试是可以正常使用的，但是在c#中就不行，请问是什么原因呢？