presto-main/src/main/java/io/prestosql/spiller/AesSpillCipher.java/AesSpillCipher/AesSpillCipher
class AesSpillCipher:    AesSpillCipher()
    {
        this.key = generateNewSecretKey();
        this.encryptSizer = createEncryptCipher(key);
        this.ivBytes = encryptSizer.getIV().length;
    }