Cognito php 密码 SRP 验证程序质询返回不正确的用户名和密码

我有一个 PHP 网页，我在其中配置了 aws sdk 并实例化了 Cognito 客户端客户端也配置了客户端机密，并且启用了身份验证流 USER_PASSWORD_AUTH、USER_SRP_AUTH。具有基本身份验证流类型 USER_PASSWORD_AUTH 的initialAuth 对我来说很好用。以下是我尝试过的示例用法 -

$result = $cognito->initiateAuth([
'AuthFlow' => 'USER_PASSWORD_AUTH',
'ClientId' => '<client_id>',
'UserPoolId' => '<pool_id>',
'AuthParameters' => [
'USERNAME' => '<username>',
'PASSWORD' => "<password>",
'SECRET_HASH' => base64_encode(hash_hmac('sha256', '<username>' . '<client_id>', '<client_secret>', true))
]
]);

有了这个，我们得到了访问和 id 令牌的成功响应，但是当我们尝试使用与 USER_SRP_AUTH 方法相同的参数时 -

$srp = new srp();
$a = $srp->getRandomSeed();
$A = $srp->generateA($a);
$result = $cognito->initiateAuth([
'AuthFlow' => 'USER_SRP_AUTH',
'ClientId' => '<client_id>',
'UserPoolId' => '<pool_id>',
'AuthParameters' => [
'USERNAME' => '<username>',
'SRP_A' => $A,
'SECRET_HASH' => base64_encode(hash_hmac('sha256', '<username>' . '<client_id>', '<client_secret>', true))
]
]);
$date = date('D M d H:i:s')." UTC 2021";
$challengeParameters = $result->get("ChallengeParameters");
$s = $srp->getRandomSeed();
$x = $srp->generateX($s, $challengeParameters['USER_ID_FOR_SRP'], '<password>');
$S = $srp->generateS_Client($A, $challengeParameters['SRP_B'], $a, $x);
$K = $srp->generateK($S);
$response = $cognito->respondToAuthChallenge([
"ChallengeName" => "PASSWORD_VERIFIER",
"ClientId" => '<client_id>',
"ChallengeResponses" => [
"TIMESTAMP" => $date,
"USERNAME" => $challengeParameters['USER_ID_FOR_SRP'],
"PASSWORD_CLAIM_SECRET_BLOCK" => $challengeParameters['SECRET_BLOCK'],
"PASSWORD_CLAIM_SIGNATURE" => hash_hmac('sha256', $K, $challengeParameters['SALT']),
'SECRET_HASH' => base64_encode(hash_hmac('sha256', $challengeParameters['USER_ID_FOR_SRP'] . '<client_id>', '<client_secret>', true))
]
]);

但是用这种方法我总是得到这个错误 -

NotAuthorizedException Error executing "RespondToAuthChallenge" on "https://cognito-idp.us-east-1.amazonaws.com"; AWS HTTP error: Client error: `POST https://cognito-idp.us-east-1.amazonaws.com` resulted in a `400 Bad Request` response: {"__type":"NotAuthorizedException","message":"Incorrect username or password."} NotAuthorizedException (client): Incorrect username or password. - {"__type":"NotAuthorizedException","message":"Incorrect username or password."}

现在我也尝试替换为challengeParams['USER_ID_FOR_SRP']，<username>但仍然出现相同的错误。

那么，这里的任何人都可以帮助我弄清楚问题是什么，并可能也尝试帮助解决它吗？