CMS_add1_signer
si = CMS_add1_signer(cms, signer, key, sign_md, tflags);
if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
if (!CMS_add1_signer(cms, scert, skey, NULL, 0))
if (!CMS_add1_signer(cms, scert2, skey2, NULL, 0))
CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
&& TEST_ptr(CMS_add1_signer(cms, cert, privkey, NULL, 0))