ossl_x509_algor_get_md
mgf1md = ossl_x509_algor_get_md(oaep->maskHash);
md = ossl_x509_algor_get_md(oaep->hashFunc);
*pmd = ossl_x509_algor_get_md(pss->hashAlgorithm);
*pmgf1md = ossl_x509_algor_get_md(pss->maskHash);
const EVP_MD *ossl_x509_algor_get_md(X509_ALGOR *alg);