SHA-1

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Revision as of 21:11, 25 November 2013 by Strife Onizuka (talk | contribs)
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 NEW  LSL now includes the function llSHA1String, which removes the need for the UTF8_SHA1 variant from this library.

Preforms a SHA-1 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).

There is also an SHA-2 implementations (224 & 256).

View "Wikipedia logo" SHA-1 for more information.

<lsl>////////////////////////////////////////////////////////////////////////////////////// // // UTF-8 SHA-1 160 // Version 1.3 // ESL Compiled: "Nov 26 2013", "00:11:59" // Copyright (C) 2013 Strife Onizuka // Based on Pseudo-code from http://en.wikipedia.org/wiki/SHA-1 // https://wiki.secondlife.com/wiki/SHA-1 // // 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 v1.0 // // "Nov 26 2013", "00:11:59" // // Copyright (C) 2004-2012, Strife Onizuka (cc-by) // // http://creativecommons.org/licenses/by/3.0/ // //===================================================// //{

string hexc="0123456789ABCDEF";

//} Combined Library

string Base64_SHA1(string plain, integer bit_length) { 

   integer H1 = 0x67452301;
   integer H2 = 0xefcdab89;
   integer H3 = 0x98badcfe;
   integer H4 = 0x10325476;
   integer H5 = 0xc3d2e1f0;

   integer b = ((bit_length + 40) >> 5) | 15;//this works because we want the value to be one less than the next appropriate multiple of 16.
   string buf = "AAA";
   integer i = -5;
   do buf += buf; while((i = -~i));
   integer S = (6 * llSubStringIndex((plain)+"=", "="));
   integer T = 0x80000000;
   if(bit_length) {
       if(S < bit_length) {
           plain = llDeleteSubString(plain, S, 0x7FFFFFF0);
           i = ((bit_length + 23) / 24) * 24;
           do 
               plain += buf;
           while((S += 576) < i);
       }
       T = 23 - ((~-(bit_length)) % 24);
       T = (llBase64ToInteger(llGetSubString((llGetSubString(plain = llGetSubString(plain, 0, (bit_length / 6) | 3), -4, (~-(S / 6)))) + "AAAAA", 0, 5)) & (0xFFFFFF00 << T)) | (0x00000080 << T);
   }
   //llOwnerSay(llList2CSV([b,j, llStringLength(buf), llIntegerToBase64(j << (6 - ((b % 3) << 1)))]));
   plain = llInsertString( llDeleteSubString(plain, -4, -1) + 
                           llGetSubString(llIntegerToBase64(T), 0, 5) + buf, (-~((b << 4) / 3)), 
                           llGetSubString(llIntegerToBase64(bit_length << (6 - ((b % 3) << 1))), 0, 5));
   //llOwnerSay(llList2CSV([llStringLength(plain), Base64ToHex(plain), T]));
   list x;
   i = 0;
   do {
       integer A = H1;
       integer B = H2;
       integer C = H3;
       integer D = H4;
       integer E = H5;
       x = (list)(bit_length = 0);//the zero gets flushed off the stack by the later loops
       do {
           T = llBase64ToInteger(buf = llGetSubString(plain, T = ((i + bit_length) << 4) / 3, T+6)) << (S = ((i + bit_length) % 3) << 1);
           if(S)
               T = T | (llBase64ToInteger("A" + (llDeleteSubString(buf, 0, 1))) >> (6 - S));

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           x += T;
           T += ((A << 5) | ((A >> 27) & 0x1F)) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(16 > (bit_length = -~bit_length));

// llOwnerSay(llList2CSV(hexm(x))); 

       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(20 > (bit_length = -~bit_length));
       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + (B ^ C ^ D) + E + 0x6ed9eba1;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(40 > (bit_length = -~bit_length));
       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + ((B & C) | (B & D) | (C & D)) + E + 0x8f1bbcdc;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(60 > (bit_length = -~bit_length));
       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + (B ^ C ^ D) + E + 0xca62c1d6;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(80 > (bit_length = -~bit_length));
       H1 += A;
       H2 += B;
       H3 += C;
       H4 += D;
       H5 += E;
   } while(b > (i += 16));
   x = [H1, H2, H3, H4, H5];
   i = -5;
   buf = "";
   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;

}

string UTF8_SHA1(string plain) { 

   integer H1 = 0x67452301;
   integer H2 = 0xefcdab89;
   integer H3 = 0x98badcfe;
   integer H4 = 0x10325476;
   integer H5 = 0xc3d2e1f0;

   //ORing on the extra bit. Since we are working in base64 the byte bounderies aren't where we want them.
   //So we get the last byte group and append our extra bit onto it. It contains either 1, 2, or 3 bytes.
   integer j = llSubStringIndex((plain = llStringToBase64(plain))+"=", "=");
   integer T = 0x80000000;
   if(j) {
       j = (6 * (T = j)) & -8;//length in bits
       T = llBase64ToInteger(llGetSubString((llGetSubString(plain, -4, (~-(T)))) + "AAAA", 0, 5)) | (0x00000080 << ((j % 3) << 3));
   }
   integer b = ((j + 40) >> 5) | 15;//this works because we want the value to be one less than the next appropriate multiple of 16.
   string buf = "AAA";
   integer i = -5;
   do buf += buf; while((i = -~i));//We need 85, 96 is close enough
   //llOwnerSay(llList2CSV([b,j, llStringLength(buf), llIntegerToBase64(j << (6 - ((b % 3) << 1)))]));
   plain = llInsertString( llDeleteSubString(plain, -4, -1) + 
                           llGetSubString(llIntegerToBase64(T), 0, 5) + buf, (b << 4) / 3, 
                           llGetSubString(llIntegerToBase64(j >> ((b % 3) << 1)), 0, 5));
   //llOwnerSay(llList2CSV([llStringLength(plain), Base64ToHex(plain)]));
   list x;
   integer S = 0;
   do {
       integer A = H1;
       integer B = H2;
       integer C = H3;
       integer D = H4;
       integer E = H5;
       x = (list)(j = 0);//the zero gets flushed off the stack by the later loops
       do {
           T = llBase64ToInteger(buf = llGetSubString(plain, T = ((i + j) << 4) / 3, T+6)) << (S = ((i + j) % 3) << 1);
           if(S)
               T = T | (llBase64ToInteger("A" + (llDeleteSubString(buf, 0, 1))) >> (6 - S));

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           x += T;
           T += ((A << 5) | ((A >> 27) & 0x1F)) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(16 > (j = -~j));

// llOwnerSay(llList2CSV(hexm(x))); 

       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + (D ^ (B & (C ^ D))) + E + 0x5a827999;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(20 > (j = -~j));
       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + (B ^ C ^ D) + E + 0x6ed9eba1;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(40 > (j = -~j));
       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + ((B & C) | (B & D) | (C & D)) + E + 0x8f1bbcdc;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(60 > (j = -~j));
       do {
           S = llList2Integer(x,  -3) ^ llList2Integer(x,  -8) ^ llList2Integer(x, -14) ^ llList2Integer(x, -16);
           x = llList2List(x + (T = ((S << 1) | !!(S & 0x80000000))), -16, -1);

// llOwnerSay("W["+(string)j+"]="+hex(T)); 

           T += ((A << 5) | ((A >> 27) & 0x1F)) + (B ^ C ^ D) + E + 0xca62c1d6;
           E = D;
           D = C;
           C = ((B << 30) | ((B >> 2) & 0x3FFFFFFF));
           B = A;
           A = T;
       } while(80 > (j = -~j));
       H1 += A;
       H2 += B;
       H3 += C;
       H4 += D;
       H5 += E;
   } while(b > (i += 16));
   x = [H1, H2, H3, H4, H5];
   i = -5;
   buf = "";
   do {
       T = llList2Integer(x,i);
       j = 32;
       do {
           buf += llGetSubString(hexc, b = ((T >> (j -= 4)) & 0xF), b);
       } while (j);
   } while ((i = -~i));
   return buf;

}


integer go(string in, string answer) { 

   llOwnerSay("");
   string b = llStringToBase64(in);
   integer len = (6 * llSubStringIndex((b)+"=", "=")) & -8;
   llResetTime();
   string outu = UTF8_SHA1(in);
   float tu = llGetTime();
   llOwnerSay(llList2CSV(([outu, tu, len])));
   llResetTime();
   string outb = Base64_SHA1(b, len);
   float tb = llGetTime();
   llOwnerSay(llList2CSV(([outb, tb, len])));
   if(answer) {
       llOwnerSay(llList2CSV(([answer, (answer == outu),(answer == outb)])));
       return (answer == outb) && (answer == outu);
   }
   return TRUE;

}

default { 

   state_entry()
   {
       if(Base64_SHA1("AAAA", 24) != "29E2DCFBB16F63BB0254DF7585A15BB6FB5E927D")
           llOwnerSay("Failed Base64_SHA1(\"AAAA\", 24)");//I don't know why this fails. Layout is correct.
       if(go("", "DA39A3EE5E6B4B0D3255BFEF95601890AFD80709"))
       if(go("abc", "A9993E364706816ABA3E25717850C26C9CD0D89D"))
       if(go("The quick brown fox jumps over the lazy dog", "2FD4E1C67A2D28FCED849EE1BB76E7391B93EB12"))
           llOwnerSay("All Tests Passed!");

// llOwnerSay((string)llGetTime()); 

   }

}</lsl>

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