PEM_read_PrivateKey
LCRYPTO_USED(PEM_read_PrivateKey);
pktmp = PEM_read_PrivateKey(fp, NULL, cb, u);
pktmp = PEM_read_PrivateKey(fp, NULL, cb, u);
pktmp = PEM_read_PrivateKey(fp, NULL, cb, u);
LCRYPTO_ALIAS(PEM_read_PrivateKey);
key = PEM_read_PrivateKey(fp, NULL, tls_password_cb, password);
if ((key = PEM_read_PrivateKey(fp, NULL, NULL, NULL)) == NULL) {
pkey = PEM_read_PrivateKey(f, NULL, NULL, NULL);
key = PEM_read_PrivateKey(fp, NULL, ssl_password_cb, pass);
key = PEM_read_PrivateKey(fp, NULL, ssl_password_cb, prompt);