Initial preparations for CURL and Discord integration.

module/Vendor/WebSocketPP/websocketpp/sha1/sha1.hpp

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+/*
+*****
+sha1.hpp is a repackaging of the sha1.cpp and sha1.h files from the smallsha1
+library (http://code.google.com/p/smallsha1/) into a single header suitable for
+use as a header only library. This conversion was done by Peter Thorson
+(webmaster@zaphoyd.com) in 2013. All modifications to the code are redistributed
+under the same license as the original, which is listed below.
+*****
+
+ 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.
+ */
+
+#ifndef SHA1_DEFINED
+#define SHA1_DEFINED
+
+namespace websocketpp {
+namespace sha1 {
+
+namespace { // local
+
+// Rotate an integer value to left.
+inline unsigned int rol(unsigned int value, 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;
+    }
+}
+
+inline 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
+
+/// Calculate a SHA1 hash
+/**
+ * @param src points to any kind of data to be hashed.
+ * @param bytelength the number of bytes to hash from the src pointer.
+ * @param hash should point to a buffer of at least 20 bytes of size for storing
+ * the sha1 result in.
+ */
+inline void calc(void const * src, size_t 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.
+    unsigned char const * sarray = (unsigned char const *) src;
+
+    // The reusable round buffer
+    unsigned int w[80];
+
+    // Loop through all complete 64byte blocks.
+
+    size_t endCurrentBlock;
+    size_t currentBlock = 0;
+
+    if (bytelength >= 64) {
+        size_t const endOfFullBlocks = bytelength - 64;
+
+        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);
+    size_t 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;
+    }
+}
+
+} // namespace sha1
+} // namespace websocketpp
+
+#endif // SHA1_DEFINED