SHA1 and AES/ECB still in used

[Gax-c]

Hello, when I was browsing the code I found SHA1 and AES/ECB are still in use. Both of these two algorithms are insecure.

SHA1 is used as the default digest algorithm, and it's clear that SHA1 is no longer secure, so I recommend switch to be better algorithm like SHA256.

Cipher.getInstance(getType()) will be Cipher.getInstance("AES"), and Cipher.getInstance("AES") will use AES/ECB in default, which is insecure. I suggest specify the mode and padding rather than using the default one.

[zzyReal666]

shardingsphere is a database enhancement project, and I don't think it should or should be responsible for the security of the algorithm, because it provides the SPI mechanism to implement the algorithm you need.