If you want to play with JWT tokens and see how they work, check <a href="https://jwt.io/" class="external-link" target="_blank">https://jwt.io</a>.

## Install `PyJWT` { #install-pyjwt }

dependencies {
  // Everything else requires Android API 21+.
  androidSignature(rootProject.libs.signature.android.apilevel21) { artifact { type = "signature" } }

  // OkHttp requires Java 8+.
  jvmSignature(rootProject.libs.codehaus.signature.java18) { artifact { type = "signature" } }

  checkstyleConfig(rootProject.libs.checkStyle) {
    isTransitive = false
  }
}

			fv:   defaultFormVals.Clone().Set(xhttp.AmzSignature, "my-signature"),
		},
		{
			name: "XIgnoreFoo does not have to appear in policy",
			fv:   defaultFormVals.Clone().Set("X-Ignore-Foo", "my-foo-value"),
		},
		{
			name: "File does not have to appear in policy",
			fv:   defaultFormVals.Clone().Set("File", "file-value"),
		},
		{
			name: "Signature does not have to appear in policy",

	return strings.HasPrefix(r.Header.Get(xhttp.Authorization), jwtAlgorithm)
}

// Verify if request has AWS Signature Version '4'.
func isRequestSignatureV4(r *http.Request) bool {
	return strings.HasPrefix(r.Header.Get(xhttp.Authorization), signV4Algorithm)
}

// Verify if request has AWS Signature Version '2'.
func isRequestSignatureV2(r *http.Request) bool {

	if err != nil {
		t.Fatal(err)
	}

    /**
     * Buffer type for credential information.
     */
    int CREDENTIAL_TYPE = 2;
    /**
     * Buffer type for server checksum signature.
     */
    int SERVER_CHECKSUM = 6;
    /**
     * Buffer type for privilege server (KDC) checksum signature.
     */
    int PRIVSVR_CHECKSUM = 7;

    /**
     * Buffer type for client name information.
     */
    int CLIENT_NAME_TYPE = 0xA;
    /**

xlHeaderVersion version == 1:

```
//msgp:tuple xlMetaV2VersionHeader
type xlMetaV2VersionHeader struct {
 VersionID [16]byte  // Version UUID, raw.
 ModTime   int64     // Unix nanoseconds.
 Signature [4]byte   // Signature of metadata.
 Type      uint8     // Type if the version
 Flags     uint8
}
```

The following flags are defined:

```
const (
 FreeVersion = 1 << 0
 UsesDataDir = 1 << 1

        // For now, we test that the method signature is correct and can be called

        AtomicInteger callbackCount = new AtomicInteger(0);

        try {
            // This will likely fail due to missing SearchEngineClient setup,
            // but we can verify the method signature and basic functionality
            SearchEngineUtil.scroll("test_index", hit -> {

        // Assert
        assertTrue(result, "Verify should return true for valid signature");
        verify(signingDigest, times(1)).verify(testData, offset, length, extraPad, message);
    }

    @Test
    @DisplayName("Test verify method returns false for invalid signature")
    void testVerifyReturnsFalse() {
        // Arrange
        int offset = 0;
        int length = testData.length;

    }

    /**
     * Returns the string representation of the method signature.
     *
     * @param methodName
     *            The method name. Cannot be {@literal null} or empty
     * @param argTypes
     *            The argument types
     * @return The string representation of the method signature
     */
    public static String getSignature(final String methodName, final Class<?>... argTypes) {