<p>Verifies the hash-based message authentication code (HMAC) for a specified message, HMAC KMS key, and MAC algorithm. To verify the HMAC, <code>VerifyMac</code> computes an HMAC using the message, HMAC KMS key, and MAC algorithm that you specify, and compares the computed HMAC to the HMAC that you specify. If the HMACs are identical, the verification succeeds; otherwise, it fails. Verification indicates that the message hasn't changed since the HMAC was calculated, and the specified key was used to generate and verify the HMAC.</p> <p>HMAC KMS keys and the HMAC algorithms that KMS uses conform to industry standards defined in <a href="https://datatracker.ietf.org/doc/html/rfc2104">RFC 2104</a>.</p> <p>This operation is part of KMS support for HMAC KMS keys. For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/hmac.html">HMAC keys in KMS</a> in the <i>Key Management Service Developer Guide</i>.</p> <p>The KMS key that you use for this operation must be in a compatible key state. For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/key-state.html">Key states of KMS keys</a> in the <i>Key Management Service Developer Guide</i>.</p> <p> <b>Cross-account use</b>: Yes. To perform this operation with a KMS key in a different Amazon Web Services account, specify the key ARN or alias ARN in the value of the <code>KeyId</code> parameter. </p> <p> <b>Required permissions</b>: <a href="https://docs.aws.amazon.com/kms/latest/developerguide/kms-api-permissions-reference.html">kms:VerifyMac</a> (key policy)</p> <p> <b>Related operations</b>: <a>GenerateMac</a> </p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}