您是在正确的轨道上。您必须已经通过BIO缓冲的方式通过 BIO_new_mem_buf包裹PEM关键存储器（）。换句话说，是这样的：

You are on the right track. You must wrap the PEM key already in memory by means of a BIO buffer via BIO_new_mem_buf(). In other words, something like:

BIO *bufio;
RSA *rsa

bufio = BIO_new_mem_buf((void*)pem_key_buffer, pem_key_buffer_len);
PEM_read_bio_RSAPublicKey(bufio, &rsa, 0, NULL);

同样的方法是有效的RSA私钥（通过 PEM_read_bio_RSAPrivateKey ），但在这种情况下，你肯定需要迎合密码短语。检查手册页了解详情。

The same approach is valid for an RSA private key (via PEM_read_bio_RSAPrivateKey), but in that case you most certainly need to cater for the pass phrase. Check the man page for details.