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Subject [GitHub] [trafodion] liuyu000 commented on a change in pull request #1825: [TRAFODION-3293] Add the AES_ENCRYPT Function in the Trafodion SQL Reference Manual
Date Mon, 08 Apr 2019 03:25:16 GMT
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:
   1. Thanks Roberta, I've incorporated your comments.
   
   2. SHA (SHA1), SHA2 and MD5 can be specified, I've added the following contents:
   
   > This _key_ can be hashed using a cryptographic hash functions, such as SHA, SHA2 and
MD5.
   >>Example
   >>>* 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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