val message = closeCodeExceptionMessage(code)
    require(message == null) { message!! }
  }

  fun acceptHeader(key: String): String {
    return (key + ACCEPT_MAGIC).encodeUtf8().sha1().base64()
  }

- `X-Amz-Server-Side-Encryption-Customer-Key`: Base64 encoded new key.
- `X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key`: Base64 encoded current key.

Such a special COPY request is also known as S3 SSE-C key rotation.

### Server-Side Encryption with a KMS

Minio mc client - https://docs.minio.io/docs/minio-client-quickstart-guide 2. export ACCESS_KEY=$(kubectl get secret {{ template "minio.secretName" . }} -o jsonpath="{.data.rootUser}" | base64 --decode) 3. export SECRET_KEY=$(kubectl get secret {{ template "minio.secretName" . }} -o jsonpath="{.data.rootPassword}" | base64 --decode) 4. mc alias set {{ template "minio.fullname" . }}-local http://localhost:{{ .Values.service.port }} "$ACCESS_KEY" "$SECRET_KEY" --api s3v4 5. mc ls {{ template "minio.fullname"...

//
// 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 (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/binary"
	"errors"
	"fmt"
	"math/rand"
	"net/http"
	"path"
	"strings"
	"sync"
	"time"

	"github.com/minio/madmin-go/v3"
	"github.com/minio/minio/internal/crypto"

//
// 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 target

import (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	elasticsearch7 "github.com/elastic/go-elasticsearch/v7"
	"github.com/minio/highwayhash"

	// MD5 checksum.
	ErrMissingCustomerKeyMD5 = Errorf("The SSE-C request is missing the customer key MD5")

	// ErrInvalidCustomerKey indicates that the SSE-C client key is not valid - e.g. not a
	// base64-encoded string or not 256 bits long.
	ErrInvalidCustomerKey = Errorf("The SSE-C client key is invalid")

	// ErrSecretKeyMismatch indicates that the provided secret key (SSE-C client key / SSE-S3 KMS key)

Minio mc client - https://docs.minio.io/docs/minio-client-quickstart-guide 2. export ACCESS_KEY=$(kubectl get secret {{ template "minio.secretName" . }} -o jsonpath="{.data.rootUser}" | base64 --decode) 3. export SECRET_KEY=$(kubectl get secret {{ template "minio.secretName" . }} -o jsonpath="{.data.rootPassword}" | base64 --decode) 4. mc alias set {{ template "minio.fullname" . }}-local http://localhost:{{ .Values.service.port }} "$ACCESS_KEY" "$SECRET_KEY" --api s3v4 5. mc ls {{ template "minio.fullname"...

Minio mc client - https://docs.minio.io/docs/minio-client-quickstart-guide 2. export ACCESS_KEY=$(kubectl get secret {{ template "minio.secretName" . }} -o jsonpath="{.data.rootUser}" | base64 --decode) 3. export SECRET_KEY=$(kubectl get secret {{ template "minio.secretName" . }} -o jsonpath="{.data.rootPassword}" | base64 --decode) 4. mc alias set {{ template "minio.fullname" . }}-local http://localhost:{{ .Values.service.port }} "$ACCESS_KEY" "$SECRET_KEY" --api s3v4 5. mc ls {{ template "minio.fullname"...

	// Create a new post policy.
	policy := newPostPolicyBytesV2(bucketName, objectName, expirationTime)
	// Only need the encoding.
	encodedPolicy := base64.StdEncoding.EncodeToString(policy)

	// Presign with V4 signature based on the policy.
	signature := calculateSignatureV2(encodedPolicy, secretKey)

	formData := map[string]string{
		"bucket":    bucketName,
		"key":       objectName + "/${filename}",

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.bouncycastle.util.encoders.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jcifs.Address;
import jcifs.CIFSContext;
import jcifs.CIFSException;
import jcifs.Config;
import jcifs.DfsReferralData;