EVP_PKEY_get1_DSA
dsa = EVP_PKEY_get1_DSA(pkey);
key = (ASN1_VALUE *)EVP_PKEY_get1_DSA(pkey);
dtmp = EVP_PKEY_get1_DSA(key);
struct dsa_st *EVP_PKEY_get1_DSA(EVP_PKEY *pkey);
(*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
prv->dsa = EVP_PKEY_get1_DSA(pk);