[jira] [Created] (DRILL-5634) Add Crypto and Hash Functions

["Charles Givre (JIRA)" <ji...@apache.org>]

Charles Givre created DRILL-5634:
------------------------------------

             Summary: Add Crypto and Hash Functions
                 Key: DRILL-5634
                 URL: https://issues.apache.org/jira/browse/DRILL-5634
             Project: Apache Drill
          Issue Type: New Feature
          Components: Functions - Drill
    Affects Versions: 1.10.0
            Reporter: Charles Givre
             Fix For: 1.11.0


This library contains a collection of cryptography-related functions for Apache Drill. It generally mirrors the crypto functions in MySQL.  The package includes:

* **`aes_encrypt()`/ `aes_decrypt()`**: implement encryption and decryption of data using the official AES (Advanced Encryption Standard) algorithm, previously known as “Rijndael.”
 `AES_ENCRYPT()` encrypts the string `str` using the key string `key_str` and returns a binary string containing the encrypted output. `AES_DECRYPT()` decrypts the encrypted string `crypt_str` using the key string `key_str` and returns the original cleartext string. If either function argument is NULL, the function returns NULL.

```sql
> SELECT aes_encrypt( 'encrypted_text', 'my_secret_key' ) AS aes FROM (VALUES(1));
+---------------------------+
|            aes            |
+---------------------------+
| JkcBUNAn8ByKWCcVmNrKMA==  |
+---------------------------+

 > SELECT aes_encrypt( 'encrypted_text', 'my_secret_key' ) AS encrypted,
 aes_decrypt(aes_encrypt( 'encrypted_text', 'my_secret_key' ),'my_secret_key') AS decrypted 
 FROM (VALUES(1));
+---------------------------+-----------------+
|         encrypted         |    decrypted    |
+---------------------------+-----------------+
| JkcBUNAn8ByKWCcVmNrKMA==  | encrypted_text  |
+---------------------------+-----------------+
```

* **`md5(<text>)`**:  Returns the md5 hash of the text. (https://en.wikipedia.org/wiki/MD5)
Usage:
```sql
> select md5( 'testing' ) from (VALUES(1));
+-----------------------------------+
|              EXPR$0               |
+-----------------------------------+
| ae2b1fca515949e5d54fb22b8ed95575  |
+-----------------------------------+
```
* **`sha(<text>`) / `sha1(<text>)`**: Calculates an SHA-1 160-bit checksum for the string, as described in RFC 3174 (Secure Hash Algorithm). (https://en.wikipedia.org/wiki/SHA-1)  The value is returned as a string of 40 hexadecimal digits, or NULL if the argument was NULL. Note that `sha()` and `sha1()` are aliases for the same function. 
```sql
> select sha1( 'testing' ) from (VALUES(1));
+-------------------------------------------+
|                  EXPR$0                   |
+-------------------------------------------+
| dc724af18fbdd4e59189f5fe768a5f8311527050  |
+-------------------------------------------+
```
* **`sha2(<text>`) / `sha256(<text>)`**: Calculates an SHA-2 256-bit checksum for the string. (https://en.wikipedia.org/wiki/SHA-2)  The value is returned as a string of hexadecimal digits, or NULL if the argument was NULL. Note that `sha2()` and `sha256()` are aliases for the same function. 
```sql
> select sha2( 'testing' ) from (VALUES(1));
+-------------------------------------------------------------------+
|                              EXPR$0                               |
+-------------------------------------------------------------------+
| cf80cd8aed482d5d1527d7dc72fceff84e6326592848447d2dc0b0e87dfc9a90  |
+-------------------------------------------------------------------+
```
Additionally, there are also `sha384(<text>)` and `sha512(<text>)` functions which return SHA-2 hashes with 384 and 512 bit checksums.



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