public void setKms(AWSKMS kms) {
        this.kms = kms;
    }
Sets the KMS implementation to be used throughout the crypto process
@param kms an {@link AWSKMS} implementation (e.g. {@link com.amazonaws.services.kms.AWSKMSClient})
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/AmazonS3EncryptionClientBuilder.java