src/main/java/com/aliyun/oss/crypto/KmsEncryptionMaterials.java [190:218]:
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            if (desc.equals(entry.getValue())) {
                return entry.getKey();
            }
        }
        return null;
    }

    /**
     * Gets the lastest key-value in the LinedHashMap.
     */
    private <K, V> Entry<K, V> getTailByReflection(LinkedHashMap<K, V> map)
            throws NoSuchFieldException, IllegalAccessException {
        Field tail = map.getClass().getDeclaredField("tail");
        tail.setAccessible(true);
        return (Entry<K, V>) tail.get(map);
    }

    /**
     * Encrypt the content encryption key(cek) and iv, and put the result into
     * {@link ContentCryptoMaterialRW}.
     * 
     * @param contentMaterialRW
     *            The materials that contans all content crypto info, 
     *            it must be constructed on outside and filled with the iv and cek.
     *            Then it will be builded with the encrypted cek ,encrypted iv, key wrap algorithm 
     *            and encryption materials description by this method.
     */
    @Override
    public void encryptCEK(ContentCryptoMaterialRW contentMaterialRW) {
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src/main/java/com/aliyun/oss/crypto/SimpleRSAEncryptionMaterials.java [99:127]:
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            if (desc.equals(entry.getValue())) {
                return entry.getKey();
            }
        }
        return null;
    }

    /**
     * Gets the lastest key-value in the LinedHashMap.
     */
    private <K, V> Entry<K, V> getTailByReflection(LinkedHashMap<K, V> map)
            throws NoSuchFieldException, IllegalAccessException {
        Field tail = map.getClass().getDeclaredField("tail");
        tail.setAccessible(true);
        return (Entry<K, V>) tail.get(map);
    }

    /**
     * Encrypt the content encryption key(cek) and iv, and put the result into
     * {@link ContentCryptoMaterialRW}.
     * 
     * @param contentMaterialRW
     *            The materials that contans all content crypto info, 
     *            it must be constructed on outside and filled with the iv cek parameters.
     *            Then it will be builed with the encrypted cek ,encrypted iv, key wrap 
     *            algorithm and encryption materials description by this method.
     */
    @Override
    public void encryptCEK(ContentCryptoMaterialRW contentMaterialRW) {
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