CMS_SignerInfo_get0_algs
CMS_SignerInfo_get0_algs(si, NULL, &x, NULL, NULL);
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
CMS_SignerInfo_get0_algs(si, NULL, NULL, &alg1, &alg2);
CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,