X509_CRL_digest
if (X509_CRL_digest(crl, digest, fingerprint, &len) != 1) {
if (!X509_CRL_digest(x, digest, md, &n)) {
X509_CRL_digest(crl, X509_CRL_HASH_EVP, crl->hash, NULL);
int X509_CRL_digest(const X509_CRL *data,const EVP_MD *type,