- [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.

// 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"

	if IsErrIgnored(err, kes.ErrNotAllowed, kms.ErrNotSupported, errors.ErrUnsupported, kms.ErrPermission) {
		// If we don't have permission to compute the HMAC, don't change the cred.
		return globalActiveCred
	}
	if err != nil {
		logger.Fatal(err, "Unable to generate root access key using KMS")
	}

```java
public class SecureChannelBinding {
    private final byte[] sessionKey;
    
    public byte[] generateChannelBindingHash(ChannelInfo channel) throws GeneralSecurityException {
        // Use HMAC-SHA256 for channel binding
        Mac mac = Mac.getInstance("HmacSHA256");
        SecretKeySpec keySpec = new SecretKeySpec(sessionKey, "HmacSHA256");
        mac.init(keySpec);
        

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrSignatureVersionNotSupported: {
		Code:           "InvalidRequest",
		Description:    "The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrBucketNotEmpty: {
		Code:           "BucketNotEmpty",
		Description:    "The bucket you tried to delete is not empty",
		HTTPStatusCode: http.StatusConflict,

size of 2^19 bits (2^16 bytes, 64 KiB). type hmacDRBG struct { newHMAC func(key []byte) *hmac.HMAC hK *hmac.HMAC V []byte reseedCounter uint64 } const ( reseedInterval = 1 << 48 maxRequestSize = (1 << 19) / 8 ) // plainPersonalization is used by HMAC_DRBG as-is. type plainPersonalization []byte func (plainPersonalization) isPersonalizationStr() {} // Each entry in blockAlignedPersonal is written to the HMAC at a // block boundary, as specified in draft-irtf-cfrg-det-sigs-with-noise-04, // Section...

	// create xlStorage test setup

}

// 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
		}

size of 2^19 bits (2^16 bytes, 64 KiB). type hmacDRBG struct { newHMAC func(key []byte) *hmac.HMAC hK *hmac.HMAC V []byte reseedCounter uint64 } const ( reseedInterval = 1 << 48 maxRequestSize = (1 << 19) / 8 ) // plainPersonalization is used by HMAC_DRBG as-is. type plainPersonalization []byte func (plainPersonalization) isPersonalizationStr() {} // Each entry in blockAlignedPersonal is written to the HMAC at a // block boundary, as specified in draft-irtf-cfrg-det-sigs-with-noise-04, // Section...

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