- [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.

	var partIDbin [4]byte
	binary.LittleEndian.PutUint32(partIDbin[:], uint32(partID)) // marshal part ID

	mac := hmac.New(sha256.New, d.objectEncryptionKey) // derive part encryption key from part ID and object key
	mac.Write(partIDbin[:])
	partEncryptionKey := mac.Sum(nil)

	// Limit the reader, so the decryptor doesn't receive bytes
	// from the next part (different DARE stream)

        // Use HMAC-SHA256 for channel binding
        Mac mac = Mac.getInstance("HmacSHA256");
        SecretKeySpec keySpec = new SecretKeySpec(sessionKey, "HmacSHA256");
        mac.init(keySpec);
        
        // Include channel-specific data
        mac.update(channel.getLocalInterface().getAddress().getAddress());
        mac.update(channel.getRemoteInterface().getAddress().getAddress());

	if GlobalKMS == nil {
		return globalActiveCred
	}

	aKey, err := GlobalKMS.MAC(GlobalContext, &kms.MACRequest{Message: []byte("root access key")})
	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 {

		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,

			return nil, ErrPermission
		}
		return nil, errDecryptionFailed(err)
	}
	return plaintext, nil
}

// 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) {

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

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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...