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[This knowledge article](https://aws.amazon.com/premiumsupport/knowledge-center/cognito-user-pool-remembered-devices/) describes the calculation of `PASSWORD_CLAIM_SIGNATURE` for the case of `ChallengeName: "DEVICE_PASSWORD_VERIFIER"`.


> * Let PASSWORD_CLAIM_SIGNATURE = SHA256_HMAC(K_USER, DeviceGroupKey + DeviceKey + PASSWORD_CLAIM_SECRET_BLOCK + TIMESTAMP), base64-encoded
> * Let K_USER = SHA256_HASH(S_USER)
> * Let S_USER = (SRP_B - k * gx)(a + ux)
> * Let x = SHA256_HASH(salt + FULL_PASSWORD)
> * Let u = SHA256_HASH(SRP_A + SRP_B)
> * Let k = SHA256_HASH(N + g)

 What is the equivalent calculation of `PASSWORD_CLAIM_SIGNATURE` for the case of `ChallengeName: "PASSWORD_VERIFIER"`?

For Cognito USER_SRP_AUTH - how to calculate PASSWORD_CLAIM_SIGNATURE to respond to ChallengeName: "PASSWORD_VERIFIER"?

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