block_encryption_mode 
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block_encryption_mode 用于指定在函数 aes_encrypt 和 aes_decrypt 中使用的加密算法。


| **属性**  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                       **描述**                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 参数类型    | enum                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 默认值     | aes-128-ecb                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 取值范围    | * aes-128-ecb   * aes-192-ecb   * aes-256-ecb   * aes-128-cbc   * aes-192-cbc   * aes-256-cbc   * aes-128-cfb1   * aes-192-cfb1   * aes-256-cfb1   * aes-128-cfb8   * aes-192-cfb8   * aes-256-cfb8   * aes-128-cfb128   * aes-192-cfb128   * aes-256-cfb128   * aes-128-ofb   * aes-192-ofb   * aes-256-ofb    |
| 生效范围    | * GLOBAL   * SESSION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| 是否参与序列化 | 是                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |