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Subject [GitHub] [trafodion] robertamarton commented on a change in pull request #1825: [TRAFODION-3293] Add the AES_ENCRYPT Function in the Trafodion SQL Reference Manual
Date Fri, 05 Apr 2019 21:37:08 GMT
robertamarton 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_r272750973
 
 

 ##########
 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:
   Later you give an example on using a cryptographic hash function to encrypt the key.  Perhaps
you can mention it here ->   "key" can be hashed using a cryptographic hash functions such
as SHA1 and MD5.  
   Do you know what cryptographic functions can be specified?

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