X509_STORE_CTX_get0_current_issuer
LCRYPTO_USED(X509_STORE_CTX_get0_current_issuer);
LCRYPTO_ALIAS(X509_STORE_CTX_get0_current_issuer);
X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx);
issuer_cert = X509_STORE_CTX_get0_current_issuer(xsc);