25 lines
613 B
MySQL
25 lines
613 B
MySQL
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DELIMITER $$
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CREATE OR REPLACE DEFINER=`root`@`localhost` FUNCTION `util`.`stringXor`(vString MEDIUMBLOB, vConst TINYINT UNSIGNED)
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RETURNS mediumblob
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DETERMINISTIC
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NO SQL
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BEGIN
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/**
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* Returns XOR of binary string and an 8-bit constant.
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*/
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DECLARE vLen, vPos INT UNSIGNED;
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DECLARE vResult MEDIUMBLOB;
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SET vLen = LENGTH(vString);
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SET vPos = 1;
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SET vResult = '';
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WHILE vPos <= vLen DO
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SET vResult = CONCAT(vResult, LPAD(HEX( ORD(SUBSTR(vString, vPos, 1)) ^ vConst), 2, '0'));
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SET vPos = vPos + 1;
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END WHILE;
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RETURN UNHEX(vResult);
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END$$
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DELIMITER ;
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