FROM_BASE64

Decode a base-64 encoded string. This function takes a base-64 string and returns the decoded binary result.

Syntax

FROM_BASE64(str)

Description

Decodes the given base-64 encode string, returning the result as a binary string. Returns NULL if the given string is NULL or if it's invalid.

It is the reverse of the TO_BASE64 function.

There are numerous methods to base-64 encode a string. MariaDB uses the following:

• It encodes alphabet value 64 as '+'.

• It encodes alphabet value 63 as '/'.

• It codes output in groups of four printable characters. Each three byte of data encoded uses four characters. If the final group is incomplete, it pads the difference with the '=' character.

• It divides long output, adding a new line very 76 characters.

• In decoding, it recognizes and ignores newlines, carriage returns, tabs and space whitespace characters.

SELECT TO_BASE64('Maria') AS 'Input';
+-----------+
| Input     |
+-----------+
| TWFyaWE=  |
+-----------+

SELECT FROM_BASE64('TWFyaWE=') AS 'Output';
+--------+
| Output |
+--------+
| Maria  |
+--------+

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