// string. Therefore, this package provides dedicated functions for
// adding and extracting the ETag to/from HTTP headers.
package etag

import (
	"bytes"
	"crypto/hmac"
	"crypto/md5"
	"encoding/base64"
	"encoding/hex"
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/minio/minio/internal/hash/sha256"

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"bufio"
	"bytes"
	"context"
	"crypto/hmac"
	"crypto/rand"
	"crypto/subtle"
	"encoding/binary"
	"encoding/hex"
	"errors"
	"fmt"
	"io"
	"maps"
	"net/http"
	"path"
	"strconv"
	"strings"

	"github.com/minio/kms-go/kes"

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"archive/zip"
	"bufio"
	"bytes"
	"context"
	"crypto/ecdsa"
	"crypto/hmac"
	crand "crypto/rand"
	"crypto/rsa"
	"crypto/sha1"
	"crypto/tls"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/base64"
	"encoding/hex"
	"encoding/pem"
	"encoding/xml"
	"errors"
	"flag"
	"fmt"

}

// MAC generates the checksum of the given req.Message using the key
// with the req.Name at the KMS.
func (c *kesConn) MAC(ctx context.Context, req *MACRequest) ([]byte, error) {
	mac, err := c.client.HMAC(context.Background(), req.Name, req.Message)
	if err != nil {
		if errors.Is(err, kes.ErrKeyNotFound) {
			return nil, ErrKeyNotFound
		}
		if errors.Is(err, kes.ErrNotAllowed) {
			return nil, ErrPermission
		}

	fmt.Println(presignedURL)
}
```

Use the Presigned URL via `curl` to receive the transformed object.
```
curl -v $(go run presigned.go)
...
...

   * Returns a hash function implementing the Message Authentication Code (MAC) algorithm, using the
   * MD5 (128 hash bits) hash function and the given secret key.
   *
   * <p>If you are designing a new system that needs HMAC, prefer {@link #hmacSha256} or other
   * future-proof algorithms <a
   * href="https://datatracker.ietf.org/doc/html/rfc6151#section-2.3">over {@code hmacMd5}</a>.
   *
   * @param key the secret key

func (r *Config) PopulatePublicKey(arn arn.ARN) error {
	pCfg := r.arnProviderCfgsMap[arn]
	if pCfg.JWKS.URL == nil || pCfg.JWKS.URL.String() == "" {
		return nil
	}

	// Add client secret for the client ID for HMAC based signature.
	r.pubKeys.add(pCfg.ClientID, []byte(pCfg.ClientSecret))

	client := &http.Client{
		Transport: r.transport,
	}

	resp, err := client.Get(pCfg.JWKS.URL.String())
	if err != nil {
		return err

�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�`�&�m�Size�
6m:M�MTime�|>���e��MetaSys��6X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm�DAREv2-HMAC-SHA256�&x-minio-internal-replication-timestamp�2023-08-18T00:09:42.389168293Z�#x-minio-internal-replication-status�^arn:minio:replication::36280125-1e9d-414e-bff5-8c88a1b5352e:disney-prod-vod-repository=FAILED;�5X-Minio-Internal-Server-Side-Encry...

- [PRF](#prf): HMAC-SHA-256
- [AEAD](#aead): AES-256-GCM if the CPU supports AES-NI, ChaCha20-Poly1305 otherwise. More specifically AES-256-GCM is only selected for X86-64 CPUs with AES-NI extension.

		Size:   595160760,
		UserDefined: map[string]string{
			crypto.MetaMultipart:                   "",
			crypto.MetaIV:                          "HTexa=",
			crypto.MetaAlgorithm:                   "DAREv2-HMAC-SHA256",
			crypto.MetaSealedKeySSEC:               "IAA8PGAA==",
			ReservedMetadataPrefix + "actual-size": "594870264",
			"content-type":                         "application/octet-stream",