ength of the string not including the terminating NUL byte. The required buffer size not including the terminating NUL byte can be obtained from <i>*out_len</i> by calling the function with <i>str</i> set to NULL.</p>

<p>EVP_PKEY_get_octet_string_param() get a key <i>pkey</i>&#39;s octet string value into a buffer <i>buf</i> of maximum size <i>max_buf_sz</i> associated with a name of <i>key_name</i>. If <i>out_len</i> is not NULL, <i>*out_len</i> is set to the length of the contents. The required buffer si