regionBytes := sumHMAC(date, []byte(region))
	service := sumHMAC(regionBytes, []byte(stype))
	signingKey := sumHMAC(service, []byte("aws4_request"))
	return signingKey
}

// getSignature final signature in hexadecimal form.
func getSignature(signingKey []byte, stringToSign string) string {
	return hex.EncodeToString(sumHMAC(signingKey, []byte(stringToSign)))
}

// Check to see if Policy is signed correctly.

        // Given
        byte[] signature = new byte[16];
        new SecureRandom().nextBytes(signature);

        // When
        transformHeader.setSignature(signature);

        // Then
        assertArrayEquals(signature, transformHeader.getSignature());
    }

    @Test
    @DisplayName("Should set and get nonce")
    void testNonce() {
        // When
        transformHeader.setNonce(testNonce);

        }

        @Override
        MethodVisitor visitMethod(int access, String name, String methodDescriptor, String signature, String[] exceptions) {
            if (behaviorName == name && methodDescriptor == behavior.getSignature()) {
                return new MethodVisitor(AsmConstants.ASM_LEVEL) {

                    @Override
                    AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {

     * @param argTypes
     *            The argument types
     * @return The string representation of the method signature
     */
    public static String getSignature(final String methodName, final Class<?>... argTypes) {
        assertArgumentNotEmpty("methodName", methodName);

        final StringBuilder buf = new StringBuilder(100);
        buf.append(methodName).append("(");

		emptySHA256 + "\n" +
		hashedChunk

	// Get hmac signing key.
	signingKey := getSigningKey(cr.cred.SecretKey, cr.seedDate, cr.region, serviceS3)

	// Calculate signature.
	newSignature := getSignature(signingKey, stringToSign)

	return newSignature
}

// getTrailerChunkSignature - get trailer chunk signature.
func (cr *s3ChunkedReader) getTrailerChunkSignature() string {

					fmt.Sprintf(credentialTemplate, accessKey, now.Format(yyyymmdd), globalMinioDefaultRegion),
				},
				"X-Amz-Date": []string{now.Format(iso8601Format)},
				"X-Amz-Signature": []string{
					getSignature(getSigningKey(globalActiveCred.SecretKey, now,
						globalMinioDefaultRegion, serviceS3), "policy"),
				},
				"Policy": []string{"policy"},
			},
			expected: ErrNone,
		},
	}

                throw new GradleException(String.format(
                        "Could not convert javadoc comment to docbook.%nClass: %s%nMethod: %s%nComment: %s",
                        ownerClass.getClassName(), methodMetaData.getSignature(), rawCommentText), e);
            }
        } finally {
            listener.finish();
        }
    }

    private void adjustAccessorComment(DocCommentImpl docComment) {

            final byte[] associatedData = transformHeader.getAssociatedData();
            byte[] nonce = transformHeader.getNonce();
            final byte[] authTag = transformHeader.getSignature();

            // Extract ciphertext
            final int ciphertextLength = encryptedMessage.length - Smb2TransformHeader.TRANSFORM_HEADER_SIZE;
            final byte[] ciphertext = new byte[ciphertextLength];

	// Get signining key.
	signingkey := getSigningKey(secretAccessKey, t, location, "s3")
	// Calculate signature.
	signature := getSignature(signingkey, policyBase64)
	return signature
}

func newPostRequestV2(endPoint, bucketName, objectName string, secretKey string, formInputData map[string]string) (*http.Request, error) {

		for _, ver := range v2 {
			b, _ := json.Marshal(ver.header)
			t.Log(string(b))
			var x xlMetaV2Version
			_, _ = x.unmarshalV(0, ver.meta)
			b, _ = json.Marshal(x)
			t.Log(string(b), x.getSignature())
		}
	}

	for i := range vers {
		t.Run(fmt.Sprintf("non-strict-q%d", i), func(t *testing.T) {
			merged := mergeXLV2Versions(i, false, 0, vers...)
			if len(merged) == 0 {