55 lines
1.6 KiB
SQL
55 lines
1.6 KiB
SQL
DELIMITER $$
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CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`cryptOff`(vText VARCHAR(255), vKey VARCHAR(255), OUT vResult VARCHAR(255))
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BEGIN
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DECLARE vUncryptedText VARCHAR(255) DEFAULT '';
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DECLARE vKeyLength INT;
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DECLARE vKeyPosition INT DEFAULT 1;
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DECLARE vKeyChar VARCHAR(1);
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DECLARE vTextLength INT;
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DECLARE vTextPosition INT DEFAULT 1;
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DECLARE vTextChar VARCHAR(1);
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DECLARE vUncryptedChar VARCHAR(1);
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DECLARE vUncryptedCharPosition INT;
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DECLARE vChain VARCHAR(255) DEFAULT '#$.-_0123456789abcdefghijklmnopqrstuvwxyz';
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DECLARE vChainTextPosition INT;
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DECLARE vChainKeyPosition INT;
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DECLARE vChainLength INT;
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SET vTextLength = LENGTH(vText);
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SET vKeyLength = LENGTH(vKey);
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SET vChainLength = LENGTH(vChain);
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WHILE vTextPosition <= vTextLength DO
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SET vTextChar = MID(vText,vTextPosition,1);
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SET vKeyChar = MID(vKey,vKeyPosition,1);
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SET vChainTextPosition = LOCATE(vTextChar, vChain);
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SET vChainKeyPosition = LOCATE(vKeyChar, vChain);
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SET vUncryptedCharPosition = vChainTextPosition - vChainKeyPosition;
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IF vUncryptedCharPosition < 1 THEN
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SET vUncryptedCharPosition = vUncryptedCharPosition + vChainLength;
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END IF;
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SET vUncryptedChar = MID(vChain, vUncryptedCharPosition,1);
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SET vUncryptedText = CONCAT(vUncryptedText, vUncryptedChar);
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SET vKeyPosition = IF(vKeyPosition = vKeyLength, 1,vKeyPosition + 1);
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SET vTextPosition = vTextPosition + 1;
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END WHILE;
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SET vResult = vUncryptedText;
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END$$
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DELIMITER ;
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