X509_sign
if (!X509_sign(ret, pkey, EVP_md5()))
int X509_sign(X509 *x, EVP_PKEY *pkey, const EVP_MD *md);
|| !TEST_true(X509_sign(x509, pkey, EVP_sha1()))
&& TEST_int_gt(X509_sign(x, privkey, signmd), 0)
ATF_REQUIRE(X509_sign(c->cert, c->pkey, EVP_sha256()) > 0);