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authorClifford Wolf <clifford@clifford.at>2013-01-05 11:13:26 +0100
committerClifford Wolf <clifford@clifford.at>2013-01-05 11:13:26 +0100
commit7764d0ba1dcf064ae487ee985c43083a0909e7f4 (patch)
tree18c05b8729df381af71b707748ce1d605e0df764 /kernel/sha1.cpp
initial import
Diffstat (limited to 'kernel/sha1.cpp')
-rw-r--r--kernel/sha1.cpp185
1 files changed, 185 insertions, 0 deletions
diff --git a/kernel/sha1.cpp b/kernel/sha1.cpp
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+/*
+ Copyright (c) 2011, Micael Hildenborg
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ * Neither the name of Micael Hildenborg nor the
+ names of its contributors may be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY Micael Hildenborg ''AS IS'' AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL Micael Hildenborg BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ Contributors:
+ Gustav
+ Several members in the gamedev.se forum.
+ Gregory Petrosyan
+ */
+
+#include "sha1.h"
+
+namespace sha1
+{
+ namespace // local
+ {
+ // Rotate an integer value to left.
+ inline unsigned int rol(const unsigned int value,
+ const unsigned int steps)
+ {
+ return ((value << steps) | (value >> (32 - steps)));
+ }
+
+ // Sets the first 16 integers in the buffert to zero.
+ // Used for clearing the W buffert.
+ inline void clearWBuffert(unsigned int* buffert)
+ {
+ for (int pos = 16; --pos >= 0;)
+ {
+ buffert[pos] = 0;
+ }
+ }
+
+ void innerHash(unsigned int* result, unsigned int* w)
+ {
+ unsigned int a = result[0];
+ unsigned int b = result[1];
+ unsigned int c = result[2];
+ unsigned int d = result[3];
+ unsigned int e = result[4];
+
+ int round = 0;
+
+ #define sha1macro(func,val) \
+ { \
+ const unsigned int t = rol(a, 5) + (func) + e + val + w[round]; \
+ e = d; \
+ d = c; \
+ c = rol(b, 30); \
+ b = a; \
+ a = t; \
+ }
+
+ while (round < 16)
+ {
+ sha1macro((b & c) | (~b & d), 0x5a827999)
+ ++round;
+ }
+ while (round < 20)
+ {
+ w[round] = rol((w[round - 3] ^ w[round - 8] ^ w[round - 14] ^ w[round - 16]), 1);
+ sha1macro((b & c) | (~b & d), 0x5a827999)
+ ++round;
+ }
+ while (round < 40)
+ {
+ w[round] = rol((w[round - 3] ^ w[round - 8] ^ w[round - 14] ^ w[round - 16]), 1);
+ sha1macro(b ^ c ^ d, 0x6ed9eba1)
+ ++round;
+ }
+ while (round < 60)
+ {
+ w[round] = rol((w[round - 3] ^ w[round - 8] ^ w[round - 14] ^ w[round - 16]), 1);
+ sha1macro((b & c) | (b & d) | (c & d), 0x8f1bbcdc)
+ ++round;
+ }
+ while (round < 80)
+ {
+ w[round] = rol((w[round - 3] ^ w[round - 8] ^ w[round - 14] ^ w[round - 16]), 1);
+ sha1macro(b ^ c ^ d, 0xca62c1d6)
+ ++round;
+ }
+
+ #undef sha1macro
+
+ result[0] += a;
+ result[1] += b;
+ result[2] += c;
+ result[3] += d;
+ result[4] += e;
+ }
+ } // namespace
+
+ void calc(const void* src, const int bytelength, unsigned char* hash)
+ {
+ // Init the result array.
+ unsigned int result[5] = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0 };
+
+ // Cast the void src pointer to be the byte array we can work with.
+ const unsigned char* sarray = (const unsigned char*) src;
+
+ // The reusable round buffer
+ unsigned int w[80];
+
+ // Loop through all complete 64byte blocks.
+ const int endOfFullBlocks = bytelength - 64;
+ int endCurrentBlock;
+ int currentBlock = 0;
+
+ while (currentBlock <= endOfFullBlocks)
+ {
+ endCurrentBlock = currentBlock + 64;
+
+ // Init the round buffer with the 64 byte block data.
+ for (int roundPos = 0; currentBlock < endCurrentBlock; currentBlock += 4)
+ {
+ // This line will swap endian on big endian and keep endian on little endian.
+ w[roundPos++] = (unsigned int) sarray[currentBlock + 3]
+ | (((unsigned int) sarray[currentBlock + 2]) << 8)
+ | (((unsigned int) sarray[currentBlock + 1]) << 16)
+ | (((unsigned int) sarray[currentBlock]) << 24);
+ }
+ innerHash(result, w);
+ }
+
+ // Handle the last and not full 64 byte block if existing.
+ endCurrentBlock = bytelength - currentBlock;
+ clearWBuffert(w);
+ int lastBlockBytes = 0;
+ for (;lastBlockBytes < endCurrentBlock; ++lastBlockBytes)
+ {
+ w[lastBlockBytes >> 2] |= (unsigned int) sarray[lastBlockBytes + currentBlock] << ((3 - (lastBlockBytes & 3)) << 3);
+ }
+ w[lastBlockBytes >> 2] |= 0x80 << ((3 - (lastBlockBytes & 3)) << 3);
+ if (endCurrentBlock >= 56)
+ {
+ innerHash(result, w);
+ clearWBuffert(w);
+ }
+ w[15] = bytelength << 3;
+ innerHash(result, w);
+
+ // Store hash in result pointer, and make sure we get in in the correct order on both endian models.
+ for (int hashByte = 20; --hashByte >= 0;)
+ {
+ hash[hashByte] = (result[hashByte >> 2] >> (((3 - hashByte) & 0x3) << 3)) & 0xff;
+ }
+ }
+
+ void toHexString(const unsigned char* hash, char* hexstring)
+ {
+ const char hexDigits[] = { "0123456789abcdef" };
+
+ for (int hashByte = 20; --hashByte >= 0;)
+ {
+ hexstring[hashByte << 1] = hexDigits[(hash[hashByte] >> 4) & 0xf];
+ hexstring[(hashByte << 1) + 1] = hexDigits[hash[hashByte] & 0xf];
+ }
+ hexstring[40] = 0;
+ }
+} // namespace sha1