 BIGNUM value <i>**bn</i> associated with a name of <i>key_name</i>. If <i>*bn</i> is NULL then the BIGNUM is allocated by the method.</p>

<p>EVP_PKEY_get_utf8_string_param() get a key <i>pkey</i> UTF8 string value into a buffer <i>str</i> of maximum size <i>max_buf_sz</i> associated with a name of <i>key_name</i>. The maximum size must be large enough to accommodate the string value including a terminating NUL byte, or this function will fail. If <i>out_len</i> is not NULL, <i>*out_len</i> is set to the l