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* the type of key material in the KMS key. Then, use the <code>KeyUsage</code> parameter
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* to determine whether the KMS key will be used to encrypt and decrypt or sign and verify.
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* You can't change these properties after the KMS key is created.</p>
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* <p>Asymmetric KMS keys contain an RSA key pair, Elliptic Curve (ECC) key pair, or an
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* SM2 key pair (China Regions only). The private key in an asymmetric KMS key never leaves
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* KMS unencrypted. However, you can use the <a>GetPublicKey</a> operation to
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* download the public key so it can be used outside of KMS. Each KMS key can have only
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* one key usage. KMS keys with RSA key pairs can be used to encrypt and decrypt data or
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* sign and verify messages (but not both). KMS keys with NIST-recommended ECC key pairs
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* can be used to sign and verify messages or derive shared secrets (but not both). KMS
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* keys with <code>ECC_SECG_P256K1</code> can be used only to sign and verify messages. KMS
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* keys with SM2 key pairs (China Regions only) can be used to either encrypt and decrypt
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* data, sign and verify messages, or derive shared secrets (you must choose one key usage
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* type). For information about asymmetric KMS keys, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/symmetric-asymmetric.html">Asymmetric KMS keys</a> in the
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* <i>Key Management Service Developer Guide</i>.</p>
* <p>Immediately initiates rotation of the key material of the specified symmetric encryption
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* KMS key.</p>
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* <p>You can perform <a href="https://docs.aws.amazon.com/kms/latest/developerguide/rotating-keys-on-demand.html">on-demand rotation</a> of
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* the key material in customer managed KMS keys, regardless of whether or not <a href="https://docs.aws.amazon.com/kms/latest/developerguide/rotating-keys-enable-disable.html">automatic key
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* <p>You can perform <a href="https://docs.aws.amazon.com/kms/latest/developerguide/rotating-keys-on-demand.html">on-demand rotation</a> of the key
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* material in customer managed KMS keys, regardless of whether or not <a href="https://docs.aws.amazon.com/kms/latest/developerguide/rotating-keys-enable-disable.html">automatic key
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* rotation</a> is enabled. On-demand rotations do not change existing automatic rotation
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* schedules. For example, consider a KMS key that has automatic key rotation enabled with a
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* rotation period of 730 days. If the key is scheduled to automatically rotate on April 14,
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