PKCS7_cert_from_signer_info
LCRYPTO_USED(PKCS7_cert_from_signer_info);
LCRYPTO_ALIAS(PKCS7_cert_from_signer_info);
X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si);