ARCFOUR Strong Encryption Implementation - Revision history

ObviousAltIsObvious Resident: tag to

2015-01-24T20:58:24Z

← Older revision		Revision as of 13:58, 24 January 2015
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	To encrypt, call the following functions:		To encrypt, call the following functions:
	<~~lsl~~>		<source lang="lsl2">
	KeySetup(string password, string nonce)		KeySetup(string password, string nonce)
	string EncryptText(string plaintext)		string EncryptText(string plaintext)
	</~~lsl~~>		</source>
	The nonce should be a randomly generated string and should only be used once.		The nonce should be a randomly generated string and should only be used once.

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	To decrypt, call the following functions:		To decrypt, call the following functions:

	<~~lsl~~>		<source lang="lsl2">
	KeySetup(string password, string nonce)		KeySetup(string password, string nonce)
	string DecryptText(string ciphertext)		string DecryptText(string ciphertext)
	</~~lsl~~>		</source>
	using the same nonce.		using the same nonce.

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	== Encryption ==		== Encryption ==
	<~~lsl~~>		<source lang="lsl2">
	//This is an exact implementation of ARCFOUR that passes the test vectors.		//This is an exact implementation of ARCFOUR that passes the test vectors.

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	}		}
	}		}
	</~~lsl~~>		</source>

	==Decryption==		==Decryption==

	<~~lsl~~>		<source lang="lsl2">
	//This is an exact implementation of ARCFOUR that passes the test vectors.		//This is an exact implementation of ARCFOUR that passes the test vectors.

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	}		}
	}		}
	</~~lsl~~>		</source>

	==Test Vectors for ARCFOUR==		==Test Vectors for ARCFOUR==
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	This code shows that it passes the test vector:		This code shows that it passes the test vector:
	<~~lsl~~>		<source lang="lsl2">
	list theState;		list theState;
	integer i;		integer i;
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	}		}
	}		}
	</~~lsl~~>		</source>

	{{#vardefine:sort\|ARCFOUR Strong Encryption Implementation}}{{LSLC\|Library}}{{LSLC\|Examples}}		{{#vardefine:sort\|ARCFOUR Strong Encryption Implementation}}{{LSLC\|Library}}{{LSLC\|Examples}}
	[[Category:LSL Encryption]]		[[Category:LSL Encryption]]

Nardok Corrimal: /* Changes */

2009-08-22T00:52:52Z

Changes

← Older revision		Revision as of 17:52, 21 August 2009
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	==Changes==		==Changes==
	===Version 1.3===		===Version 1.3===
	*Corrected typecasting error		*Corrected typecasting error. Anyone using this script prior to 2009-08-22 MUST update their copy to address this issue.

	===Version 1.2===		===Version 1.2===

Nardok Corrimal: /* Version 1.3 */

2009-08-22T00:42:33Z

Version 1.3

← Older revision		Revision as of 17:42, 21 August 2009
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	===Version 1.3===		===Version 1.3===
	*Corrected typecasting error		*Corrected typecasting error
	~~Anyone using this script before 2009-08-22 (Friday, August 22, 2009) should update their scripts to address this issue.~~

	===Version 1.2===		===Version 1.2===

Nardok Corrimal: /* Version 1.3 */

2009-08-22T00:40:24Z

Version 1.3

← Older revision		Revision as of 17:40, 21 August 2009
Line 64:		Line 64:
	===Version 1.3===		===Version 1.3===
	*Corrected typecasting error		*Corrected typecasting error
			Anyone using this script before 2009-08-22 (Friday, August 22, 2009) should update their scripts to address this issue.

	===Version 1.2===		===Version 1.2===

Nardok Corrimal: /* Changes */

2009-08-22T00:37:06Z

Changes

← Older revision		Revision as of 17:37, 21 August 2009
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	==Changes==		==Changes==
			===Version 1.3===
			*Corrected typecasting error

	===Version 1.2===		===Version 1.2===
	*Outputs to Hex instead of a CSV of bytes		*Outputs to Hex instead of a CSV of bytes

Nardok Corrimal: /* Decryption */

2009-08-22T00:28:12Z

Decryption

← Older revision		Revision as of 17:28, 21 August 2009
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	list statePartThree = [151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225];		list statePartThree = [151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225];
	list statePartFour = [226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255];		list statePartFour = [226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255];
	~~list~~ theState = (statePartOne = statePartTwo = statePartThree = statePartFour = []) + statePartOne + statePartTwo + statePartThree + statePartFour;		theState = (statePartOne = statePartTwo = statePartThree = statePartFour = []) + statePartOne + statePartTwo + statePartThree + statePartFour;
	integer swapper;		integer swapper;
	//setup the plaintext list		//setup the plaintext list
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	}		}
	</lsl>		</lsl>

	==Test Vectors for ARCFOUR==		==Test Vectors for ARCFOUR==
	Test vectors are from [http://www.bookrags.com/wiki/RC4 RC4 Summary]		Test vectors are from [http://www.bookrags.com/wiki/RC4 RC4 Summary]

Nardok Corrimal: /* Encryption */

2009-08-22T00:27:38Z

Encryption

← Older revision		Revision as of 17:27, 21 August 2009
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	list statePartThree = [151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225];		list statePartThree = [151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225];
	list statePartFour = [226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255];		list statePartFour = [226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255];
	~~list~~ theState = (statePartOne = statePartTwo = statePartThree = statePartFour = []) + statePartOne + statePartTwo + statePartThree + statePartFour;		theState = (statePartOne = statePartTwo = statePartThree = statePartFour = []) + statePartOne + statePartTwo + statePartThree + statePartFour;
	integer swapper;		integer swapper;
	//setup the plaintext list		//setup the plaintext list

Nardok Corrimal: /* Documentation */

2009-08-22T00:26:05Z

Documentation

← Older revision		Revision as of 17:26, 21 August 2009
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	The key setup is very slow, but encryption itself is quite fast.		The key setup is very slow, but encryption itself is quite fast.

			Note: The EncryptText() and DecryptText() functions are NOT compatible. They CANNOT be used in the same script.

	== About ARCFOUR ==		== About ARCFOUR ==

Nekow42 Zarf: Thank you! For aesthetics, swapping the variable names would make more sense and be more consistent.

2008-07-10T00:05:07Z

Thank you! For aesthetics, swapping the variable names would make more sense and be more consistent.

← Older revision		Revision as of 17:05, 9 July 2008
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	//setup the plaintext list		//setup the plaintext list
	integer ThePerpetualMax;		integer ThePerpetualMax;
	~~counter~~ = llStringLength(ciphertext) - 1;		ThePerpetualMax = llStringLength(ciphertext) - 1;
	for(~~ThePerpetualMax~~ = 0; ThePerpetualMax < counter~~; ThePerpetualMax~~+=2)		for(counter = 0; counter < ThePerpetualMax; counter+=2)
	{		{
	CiphertextBytes = (CiphertextBytes = []) + CiphertextBytes + (integer)("0x"+llGetSubString(ciphertext,~~ThePerpetualMax~~,~~ThePerpetualMax~~+1));		CiphertextBytes = (CiphertextBytes = []) + CiphertextBytes + (integer)("0x"+llGetSubString(ciphertext,counter,counter+1));
	}		}
	//setup the password. Use i since we already have it.		//setup the password. Use i since we already have it.

Strife Onizuka: no thanks necessary but you will want to after you notice the speed increase.

2008-07-09T22:47:20Z

no thanks necessary but you will want to after you notice the speed increase.

← Older revision		Revision as of 15:47, 9 July 2008
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	//setup the plaintext list		//setup the plaintext list
	integer ThePerpetualMax;		integer ThePerpetualMax;
	for(ThePerpetualMax = 0; ThePerpetualMax < ~~llStringLength(ciphertext)-1~~; ThePerpetualMax+=2)		counter = llStringLength(ciphertext) - 1;
			for(ThePerpetualMax = 0; ThePerpetualMax < counter; ThePerpetualMax+=2)
	{		{
	CiphertextBytes = (CiphertextBytes = []) + CiphertextBytes + (integer)("0x"+llGetSubString(ciphertext,ThePerpetualMax,ThePerpetualMax+1));		CiphertextBytes = (CiphertextBytes = []) + CiphertextBytes + (integer)("0x"+llGetSubString(ciphertext,ThePerpetualMax,ThePerpetualMax+1));