EVP_PKEY_get1_DSA
key = (ASN1_VALUE *)EVP_PKEY_get1_DSA(pkey);
DSA *EVP_PKEY_get1_DSA(const EVP_PKEY *pkey);
LCRYPTO_ALIAS(EVP_PKEY_get1_DSA);
LCRYPTO_USED(EVP_PKEY_get1_DSA);
dtmp = EVP_PKEY_get1_DSA(key);
dsa = EVP_PKEY_get1_DSA(pkey);