BitRotLeftKey

Summary

User-Defined Function: key uBitRotLeftKey( string vStrKey, integer vIntRot );

Returns a key that is vStr rotary shifted left vIntRot bits.

• vStrKey: source key to rotary shift
• vIntRot: number of bits to shift

Code:

• LSO: 6148 bytes
• MONO: 2048 bytes

<lsl>key uBitRotLeftKey( string vStrKey, integer vIntRot ){ vStrKey = (string)llParseString2List( vStrKey, ["-"], [] ); vStrKey = //-- rotate by characters (half-bytes chunks) llGetSubString( vStrKey + llGetSubString( vStrKey, 0xFFFFFFDF, //-- (-33) (vIntRot >> 2) - 33), 0xFFFFFFE0, //-- (-32) 0xFFFFFFFF ); //-- (-1) //-- push hex characters on the front end and tack on and extra character for the partial shift wrapping vStrKey = "0123456789abcdef" + vStrKey + llGetSubString( vStrKey, 0, 0 ); vIntRot = 4 - (vIntRot & 3); //-- (4-(vIntRot%4)) get the shift back for a double byte cut integer vIdxChr = 16; //-- start past hex characters integer vIdxHex; do{ vStrKey += //-- pull hex characters from front of string llGetSubString( vStrKey, //-- grab 2 bytes, shift back and AND to get the shifted byte vIdxHex = ((integer)("0x" + llGetSubString( vStrKey, vIdxChr, ++vIdxChr )) >> vIntRot) & 0xF, vIdxHex ); }while (vIdxChr < 48); return //-- correct type, grab from the back end, and push proper format (key)(llGetSubString( vStrKey, 0xFFFFFFE0, 0xFFFFFFE7 ) + //-- (-32, -25) "-" + llGetSubString( vStrKey, 0xFFFFFFE8, 0xFFFFFFEB ) + //-- (-24, -21) "-" + llGetSubString( vStrKey, 0xFFFFFFEC, 0xFFFFFFEF ) + //-- (-20, -17) "-" + llGetSubString( vStrKey, 0xFFFFFFF0, 0xFFFFFFF3 ) + //-- (-16, -13) "-" + llGetSubString( vStrKey, 0xFFFFFFF4, 0xFFFFFFFF )); //-- (-12, -1) } /*//-- Anti-License Text --//*/ /*// Contributed Freely to the Public Domain without limitation. //*/ /*// 2009 (CC0) [ http://creativecommons.org/publicdomain/zero/1.0 ] //*/ /*// Void Singer [ https://wiki.secondlife.com/wiki/User:Void_Singer ] //*/

/*//-- --//*/</lsl>

Caveats

• This function does not check input key validity
• Expected Range for vIntRot is [0, 127], values outside this range will not give expected results.