[openssl-users] error making Private RSA

[Salz, Rich]

What version of openssl?  I'm guessing 1.0.2.

Put this line inyour code
	ERR_load_ERR_strings();
And youll get a more informative message.	

My main guess is that your allocation for the PEM buffer is too small -- is key/key_len pointing to a static buffer?