Difference between revisions of "SHA-1"

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m
m (I don't know where that bug came from)
Line 183: Line 183:
j = 32;
j = 32;
do
do
buf += llGetSubString(hexc, b = ((T >> (j -= 8)) & 0xF), b);
buf += llGetSubString(hexc, b = ((T >> (j -= 4)) & 0xF), b);
while (j);
while (j);
}while ((i = -~i));
}while ((i = -~i));
Line 316: Line 316:
bit_length = 32;
bit_length = 32;
do
do
buf += llGetSubString(hexc, b = ((T >> (bit_length -= 8)) & 0xF), b);
buf += llGetSubString(hexc, b = ((T >> (bit_length -= 4)) & 0xF), b);
while (bit_length);
while (bit_length);
}while ((i = -~i));
}while ((i = -~i));

Revision as of 20:45, 24 October 2007

Preforms a SHA1 Hash on the text. Similar to and MD5 hash, although (slightly) more secure. Two versions of the function are provided, one for UTF-8 Strings (all strings in LSL are UTF-8) and the other is for Base64 Strings (you need to tell it how many bits long the data is).

View http://en.wikipedia.org/wiki/SHA1 for more information. 

//////////////////////////////////////////////////////////////////////////////////////
//
//	UTF-8 SHA1
//	Version 1.0 
//	ESL Compiled: "Oct 24 2007", "22:15:01"
//	Copyright (C) 2007  Strife Onizuka
//	Based on Pseudo-code from http://en.wikipedia.org/wiki/SHA hash functions
//	https://wiki.secondlife.com/wiki/SHA1
//
//	This library is free software; you can redistribute it and/or
//	modify it under the terms of the GNU Lesser General Public License
//	as published by the Free Software Foundation;
//	version 3 of the License.
//	
//	This library is distributed in the hope that it will be useful,
//	but WITHOUT ANY WARRANTY; without even the implied warranty of
//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//	GNU Lesser General Public License for more details.
//	
//	You should have received a copy of the GNU Lesser General Public License
//	along with this library.  If not, see <http://www.gnu.org/licenses/>
//	or write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
//	Boston, MA  02111-1307  USA
//	
//////////////////////////////////////////////////////////////////////////////////////

//===================================================//
//                 Combined Library                  //
//             "Oct 24 2007", "22:15:01"             //
//  Copyright (C) 2004-2007, Strife Onizuka (cc-by)  //
//    http://creativecommons.org/licenses/by/3.0/    //
//===================================================//
//{

string TrimRight(string src, string chrs)//Mono Unsafe, LSO Safe
{
    integer i = llStringLength(src);
    do;while(~llSubStringIndex(chrs, llGetSubString(src, (i = ~-i), i)) && i);
    return llDeleteSubString(src, (-~(i)), 0xFFFF);
}

string hexc="0123456789ABCDEF";

//} Combined Library


integer rol(integer number, integer ammount) {
    return (number << ammount) | ((number >> (32 - ammount)) & (~(-1 << ammount)));
}

string UTF8_SHA1(string plain) {
    integer H1 = 0x67452301;
    integer H2 = 0xefcdab89;
    integer H3 = 0x98badcfe;
    integer H4 = 0x10325476;
    integer H5 = 0xc3d2e1f0;

    //OR on the extra bit.
    integer j = llStringLength(plain) << 3;
    integer b = (~-(((j + 552) & -512) >> 5));
    integer T = llBase64ToInteger(TrimRight(llGetSubString(plain = llStringToBase64(plain), -4, -1),"=")+"AAAA");
    string buf;
    integer i = 0;
    for(;i < 85 ; (i = -~i))
        buf += "A";
    if(j)
    {
        i = 0x800000;
        if(T & 0xFF00)
            i = 0x00000080;
        else if(T & 0xFF0000)
            i = 0x00008000;
    }
    else
        T = i = 0x80000000;//T is corrupt because of https://jira.secondlife.com/browse/SVC-104
//    llOwnerSay(llList2CSV([i,j]));
    plain = llGetSubString( llDeleteSubString(plain, -4, -1) + 
                            llGetSubString(llIntegerToBase64(T | i), 0, 5) + 
                            buf, 0, (b << 4) / 3) + 
            llIntegerToBase64(j << (6 - ((b % 3) << 1)));
    buf = "";

    list x;
    for (i = 0; i < b; i += 16)
    {
        integer A = H1;
        integer B = H2;
        integer C = H3;
        integer D = H4;
        integer E = H5;
        for(j = 0; j < 16; (j = -~j))
        {
            T = ((i + j) << 4) / 3;
            integer offset = ((i + j) % 3) << 1;
            if(offset)
                T = ((llBase64ToInteger(llGetSubString(plain, T, T+5)) << offset) | 
                     (llBase64ToInteger("A"+llGetSubString(plain, T+2, T+6)) >> (6 - offset)));
            else
                T = llBase64ToInteger(llGetSubString(plain, T, T+5));
//            llOwnerSay("W["+(string)j+"]="+hex(T));
            x += T;
            T += rol(A,5) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
//		llOwnerSay(llList2CSV(hexm(x)));
        for (; j < 20; (j = -~j))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)j+"]="+hex(T));
            T += rol(A,5) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        for (; j < 40; (j = -~j))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)j+"]="+hex(T));
            T += rol(A,5) + (B ^ C ^ D) + E + 0x6ed9eba1;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        for (; j < 60; (j = -~j))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)j+"]="+hex(T));
            T += rol(A,5) + ((B & C) | (B & D) | (C & D)) + E + 0x8f1bbcdc;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        for (; j < 80; (j = -~j))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)j+"]="+hex(T));
            T += rol(A,5) + (B ^ C ^ D) + E + 0xca62c1d6;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        H1 += A;
        H2 += B;
        H3 += C;
        H4 += D;
        H5 += E;
    }
    x = [H1, H2, H3, H4, H5];
	i = -5;
    do
	{
		T = llList2Integer(x,i);
		j = 32;
		do
			buf += llGetSubString(hexc, b = ((T >> (j -= 4)) & 0xF), b);
		while (j);
	}while ((i = -~i));
    return buf;
}

string Base64_SHA1(string plain, integer bit_length) {
    integer H1 = 0x67452301;
    integer H2 = 0xefcdab89;
    integer H3 = 0x98badcfe;
    integer H4 = 0x10325476;
    integer H5 = 0xc3d2e1f0;

    //OR on the extra bit.
    integer b = (~-(((bit_length + 552) & -512) >> 5));
    integer T = llBase64ToInteger(TrimRight(llGetSubString(plain, -4, -1),"=")+"AAAA");
    string buf;
    integer i = 0;
    for(;i < 85 ; (i = -~i))
        buf += "A";
    if(bit_length)
    {
        i = 0x800000;
        if(T & 0xFF00)
            i = 0x00000080;
        else if(T & 0xFF0000)
            i = 0x00008000;
    }
    else
        T = i = 0x80000000;//T is corrupt because of https://jira.secondlife.com/browse/SVC-104
//    llOwnerSay(llList2CSV([i,bit_length]));
    plain = llGetSubString( llDeleteSubString(plain, -4, -1) + 
                            llGetSubString(llIntegerToBase64(T | i), 0, 5) + 
                            buf, 0, (b << 4) / 3) + 
            llIntegerToBase64(bit_length << (6 - ((b % 3) << 1)));
    buf = "";

    list x;
    for (i = 0; i < b; i += 16)
    {
        integer A = H1;
        integer B = H2;
        integer C = H3;
        integer D = H4;
        integer E = H5;
        for(bit_length = 0; bit_length < 16; (bit_length = -~bit_length))
        {
            T = ((i + bit_length) << 4) / 3;
            integer offset = ((i + bit_length) % 3) << 1;
            if(offset)
                T = ((llBase64ToInteger(llGetSubString(plain, T, T+5)) << offset) | 
                     (llBase64ToInteger("A"+llGetSubString(plain, T+2, T+6)) >> (6 - offset)));
            else
                T = llBase64ToInteger(llGetSubString(plain, T, T+5));
//            llOwnerSay("W["+(string)bit_length+"]="+hex(T));
            x += T;
            T += rol(A,5) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
//		llOwnerSay(llList2CSV(hexm(x)));
        for (; bit_length < 20; (bit_length = -~bit_length))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)bit_length+"]="+hex(T));
            T += rol(A,5) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        for (; bit_length < 40; (bit_length = -~bit_length))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)bit_length+"]="+hex(T));
            T += rol(A,5) + (B ^ C ^ D) + E + 0x6ed9eba1;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        for (; bit_length < 60; (bit_length = -~bit_length))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)bit_length+"]="+hex(T));
            T += rol(A,5) + ((B & C) | (B & D) | (C & D)) + E + 0x8f1bbcdc;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        for (; bit_length < 80; (bit_length = -~bit_length))
        {
            x = llList2List(x + T = rol(llList2Integer(x,  -3) ^
                                        llList2Integer(x,  -8) ^
                                        llList2Integer(x, -14) ^
                                        llList2Integer(x, -16), 1), -16, -1);
//            llOwnerSay("W["+(string)bit_length+"]="+hex(T));
            T += rol(A,5) + (B ^ C ^ D) + E + 0xca62c1d6;
            E = D;
            D = C;
            C = rol(B, 30);
            B = A;
            A = T;
        }
        H1 += A;
        H2 += B;
        H3 += C;
        H4 += D;
        H5 += E;
    }
    x = [H1, H2, H3, H4, H5];
	i = -5;
    do
	{
		T = llList2Integer(x,i);
		bit_length = 32;
		do
			buf += llGetSubString(hexc, b = ((T >> (bit_length -= 4)) & 0xF), b);
		while (bit_length);
	}while ((i = -~i));
    return buf;
}


default
{
    state_entry()
    {
        llOwnerSay("");
        llOwnerSay(UTF8_SHA1(""));
        llOwnerSay("DA39A3EE5E6B4B0D3255BFEF95601890AFD80709");
        llOwnerSay("");
        llOwnerSay(UTF8_SHA1("abc"));
        llOwnerSay("A9993E364706816ABA3E25717850C26C9CD0D89D");
        llOwnerSay("");
        llOwnerSay(UTF8_SHA1("The quick brown fox jumps over the lazy dog"));
        llOwnerSay("2FD4E1C67A2D28FCED849EE1BB76E7391B93EB12");
//        llOwnerSay((string)llGetTime());
    }
}
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