sk_PKCS7_SIGNER_INFO_value
si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
PKCS7_SIGNER_INFO *si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0);
sk_PKCS7_SIGNER_INFO_value(p7si, i));
algs = PKCS7_get_smimecap(sk_PKCS7_SIGNER_INFO_value(p7si, i));