liuyu000 commented on a change in pull request #1825: [TRAFODION-3293] Add the
AES_ENCRYPT Function in the Trafodion SQL Reference Manual
URL: https://github.com/apache/trafodion/pull/1825#discussion_r272875633
##########
File path:
docs/sql_reference/src/asciidoc/_chapters/sql_functions_and_expressions.adoc
##########
@@ -487,6 +487,141 @@ LARGEINT if the precision of the argument is greater
than or equal to
ABS (-20 + 12)
```
+<<<
+[[aes_encrypt_function]]
+== AES_ENCRYPT Function
+
+The AES_ENCRYPT function encrypts a `_string_` using a specified encryption
`_key_` with the AES (Advanced Encryption Standard) algorithm and returns a
binary string.
+
+This function prevents sensitive data from being visible to the public. For
example, use the AES_ENCRYPT function to encrypt person identity number to
preserve user confidentiality.
+
+`AES_ENCRYPT (_string_, _key_)`
+
+[[syntax_description_of_aes_encrypt]]
+=== Syntax Description of AES_ENCRYPT
+
+* `_string_`
++
+is the data to be encrypted.
+
+* `_key_`
++
+is the encryption key to encrypt the `_string_`.
Review comment:
Thanks Roberta, I've incorporated your comments.
SHA (SHA1), SHA2 and MD5 can be specified, I've added the following
contents, any thoughts?
This `key` can be hashed using a cryptographic hash function, such as SHA,
SHA2 and MD5.
- This example demonstrates how the AES_ENCRYPT function works with the SHA
function.
```
SELECT AES_ENCRYPT ('hello',SHA ('world')) FROM DUAL;
(EXPR)
----------------
[}âXéò0Êw«æÝAÆc
--- 1 row(s) selected.
```
- This example demonstrates how the AES_ENCRYPT function works with the SHA2
function.
```
SELECT AES_ENCRYPT ('hello',SHA2 ('world',512)) FROM DUAL;
(EXPR)
----------------
¤÷èx¼ó=L*Ì-µO*A
--- 1 row(s) selected.
```
- This example demonstrates how the AES_ENCRYPT function works with the MD5
function.
```
SELECT AES_ENCRYPT ('hello',MD5 ('world')) FROM DUAL;
(EXPR)
----------------
C¡ïcåsí[1Ø
--- 1 row(s) selected.
```
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