如何从无符号char *模数和指数65537创建RSA公钥(RSA_F4)

I'm trying generate a rsa public key from a modulus type char[], and I now the exponent is RSA_F4(65537); But when I'm trying generate my public key using this values for "n" and "e", the RSA_public_encrypt, return -1;I'm trying generate a rsa public key from a mod