docs/sql-manual/sql-functions/encrypt-digest-functions/aes-decrypt.md

---
{
"title": "AES_DECRYPT",
"language": "en"
}
---

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### Description

AES decryption function. This function behaves like the `AES_DECRYPT` function in MySQL. By default, it uses the `AES_128_ECB` algorithm with `PKCS7` padding mode. The underlying decryption is done using the OpenSSL library.

#### Syntax

`VARCHAR AES_DECRYPT(VARCHAR str, VARCHAR key_str[, VARCHAR init_vector][, VARCHAR encryption_mode])`

Returns the decrypted result, where:
- `str` is the text to be decrypted;
- `key_str` is the key. Note that this key is not a hexadecimal encoding, but a string representation of the encoded key. For example, for 128-bit key encryption, `key_str` should be 16-length. If the key is not long enough, use **zero padding** to make it up. If it is longer than that, the final key is found using a cyclic xor method. For example, if the 128-bit key used by the algorithm finally is `key`, then `key[i] = key_str[i] ^ key_str[i+128] ^ key_str[i+256] ^ ...`
- `init_vector` is the initial vector to be used in the algorithm, this is only valid for some algorithms, if not specified then Doris will use the built-in value;
- `encryption_mode` is the encryption algorithm, optionally available in variable.

### Example

```sql
mysql> set block_encryption_mode='';
Query OK, 0 rows affected (0.10 sec)

mysql> select aes_decrypt(from_base64('wr2JEDVXzL9+2XtRhgIloA=='),'F3229A0B371ED2D9441B830D21A390C3');
+--------------------------------------------------------------------------------+
| aes_decrypt(from_base64('wr2JEDVXzL9+2XtRhgIloA=='), '***', '', 'AES_128_ECB') |
+--------------------------------------------------------------------------------+
| text                                                                           |
+--------------------------------------------------------------------------------+
1 row in set (0.14 sec)

mysql> set block_encryption_mode="AES_256_CBC";
Query OK, 0 rows affected (0.10 sec)

mysql> select aes_decrypt(from_base64('3dym0E7/+1zbrLIaBVNHSw=='),'F3229A0B371ED2D9441B830D21A390C3');
+--------------------------------------------------------------------------------+
| aes_decrypt(from_base64('3dym0E7/+1zbrLIaBVNHSw=='), '***', '', 'AES_256_CBC') |
+--------------------------------------------------------------------------------+
| text                                                                           |
+--------------------------------------------------------------------------------+
1 row in set (0.12 sec)

mysql> select AES_DECRYPT(FROM_BASE64('tsmK1HzbpnEdR2//WhO+MA=='),'F3229A0B371ED2D9441B830D21A390C3', '0123456789');
+------------------------------------------------------------------------------------------+
| aes_decrypt(from_base64('tsmK1HzbpnEdR2//WhO+MA=='), '***', '0123456789', 'AES_256_CBC') |
+------------------------------------------------------------------------------------------+
| text                                                                                     |
+------------------------------------------------------------------------------------------+
1 row in set (0.12 sec)
```

### Keywords
    AES_DECRYPT, AES, DECRYPT