SHA-1
Revision as of 15:52, 9 December 2023 by Garfield Linden (talk | contribs) (Direct residents to built-in SHA functions; tweak wording.)
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Security Warning! |
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There are dire security implications to changing the K constants (these are the hex values near the end of the lines marked with "//k" comments). https://malicioussha1.github.io/ |
NEW LSL now includes its own (faster) llSHA1String function, which removes the need for the UTF8_SHA1 variant from this library. Also consider the more secure llSHA256String.
Performs a SHA-1 hash on the text. This is similar to an MD5 hash, but is slightly more secure. Two versions of the function are provided: one for UTF-8 strings (all strings in LSL are UTF-8) and another for Base64 strings (for which you need to specify the data length in bits).
There are also two SHA-2 script implementations (SHA-256 & SHA-224), though consider the faster llSHA256String provided by LSL itself.
View 
SHA-1 for more information.
//////////////////////////////////////////////////////////////////////////////////////
//
// 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;//k
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;//k
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;//k
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;//k
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;//k
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;//k
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;//k
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;//k
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;//k
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;//k
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)");
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());
}
}