New -mac and -macopt options to dgst utility. Reimplement -hmac option in
terms of new API.

crypto/evp/pmeth_gn.c

diff --git a/crypto/evp/pmeth_gn.c b/crypto/evp/pmeth_gn.c
index eb81d52..17e0d54 100644
--- a/crypto/evp/pmeth_gn.c
+++ b/crypto/evp/pmeth_gn.c
@@ -196,3 +196,24 @@
 		return 0;
 	return ctx->keygen_info[idx];
 	}
+
+EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e,
+				unsigned char *key, int keylen)
+	{
+	EVP_PKEY_CTX *mac_ctx = NULL;
+	EVP_PKEY *mac_key = NULL;
+	mac_ctx = EVP_PKEY_CTX_new_id(type, e);
+	if (!mac_ctx)
+		return NULL;
+	if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
+		goto merr;
+	if (EVP_PKEY_CTX_ctrl(mac_ctx, -1, EVP_PKEY_OP_KEYGEN,
+				EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key) <= 0)
+		goto merr;
+	if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
+		goto merr;
+	merr:
+	if (mac_ctx)
+		EVP_PKEY_CTX_free(mac_ctx);
+	return mac_key;
+	}