public String getKmsKeyId() {
        return kmsKeyId;
    }
<p>
If the encryption type is <code>aws:kms</code>, this optional value specifies the ID of the symmetric encryption
customer managed key to use for encryption of job results. Amazon S3 only supports symmetric encryption KMS keys.
For more information, see <a
href="https://docs.aws.amazon.com/kms/latest/developerguide/symmetric-asymmetric.html">Asymmetric keys in Amazon
Web Services KMS</a> in the <i>Amazon Web Services Key Management Service Developer Guide</i>.
</p>

@return If the encryption type is <code>aws:kms</code>, this optional value specifies the ID of the symmetric
        encryption customer managed key to use for encryption of job results. Amazon S3 only supports symmetric
        encryption KMS keys. For more information, see <a
        href="https://docs.aws.amazon.com/kms/latest/developerguide/symmetric-asymmetric.html">Asymmetric keys in
        Amazon Web Services KMS</a> in the <i>Amazon Web Services Key Management Service Developer Guide</i>.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/Encryption.java