Imported MaNGOS revision 6767 from http://mangos.svn.sourceforge.net/svnroot/mangos/trunk/

src/shared/Auth/BigNumber.cpp

@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "Auth/BigNumber.h"
+#include <openssl/bn.h>
+#include <algorithm>
+
+BigNumber::BigNumber()
+{
+    _bn = BN_new();
+    _array = NULL;
+}
+
+BigNumber::BigNumber(const BigNumber &bn)
+{
+    _bn = BN_dup(bn._bn);
+    _array = NULL;
+}
+
+BigNumber::BigNumber(uint32 val)
+{
+    _bn = BN_new();
+    BN_set_word(_bn, val);
+    _array = NULL;
+}
+
+BigNumber::~BigNumber()
+{
+    BN_free(_bn);
+    if(_array) delete[] _array;
+}
+
+void BigNumber::SetDword(uint32 val)
+{
+    BN_set_word(_bn, val);
+}
+
+void BigNumber::SetQword(uint64 val)
+{
+    BN_add_word(_bn, (uint32)(val >> 32));
+    BN_lshift(_bn, _bn, 32);
+    BN_add_word(_bn, (uint32)(val & 0xFFFFFFFF));
+}
+
+void BigNumber::SetBinary(const uint8 *bytes, int len)
+{
+    uint8 t[1000];
+    for (int i = 0; i < len; i++) t[i] = bytes[len - 1 - i];
+    BN_bin2bn(t, len, _bn);
+}
+
+void BigNumber::SetHexStr(const char *str)
+{
+    BN_hex2bn(&_bn, str);
+}
+
+void BigNumber::SetRand(int numbits)
+{
+    BN_rand(_bn, numbits, 0, 1);
+}
+
+BigNumber BigNumber::operator=(const BigNumber &bn)
+{
+    BN_copy(_bn, bn._bn);
+    return *this;
+}
+
+BigNumber BigNumber::operator+=(const BigNumber &bn)
+{
+    BN_add(_bn, _bn, bn._bn);
+    return *this;
+}
+
+BigNumber BigNumber::operator-=(const BigNumber &bn)
+{
+    BN_sub(_bn, _bn, bn._bn);
+    return *this;
+}
+
+BigNumber BigNumber::operator*=(const BigNumber &bn)
+{
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_mul(_bn, _bn, bn._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return *this;
+}
+
+BigNumber BigNumber::operator/=(const BigNumber &bn)
+{
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_div(_bn, NULL, _bn, bn._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return *this;
+}
+
+BigNumber BigNumber::operator%=(const BigNumber &bn)
+{
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_mod(_bn, _bn, bn._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return *this;
+}
+
+BigNumber BigNumber::Exp(const BigNumber &bn)
+{
+    BigNumber ret;
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_exp(ret._bn, _bn, bn._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return ret;
+}
+
+BigNumber BigNumber::ModExp(const BigNumber &bn1, const BigNumber &bn2)
+{
+    BigNumber ret;
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_mod_exp(ret._bn, _bn, bn1._bn, bn2._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return ret;
+}
+
+int BigNumber::GetNumBytes(void)
+{
+    return BN_num_bytes(_bn);
+}
+
+uint32 BigNumber::AsDword()
+{
+    return (uint32)BN_get_word(_bn);
+}
+
+uint8 *BigNumber::AsByteArray(int minSize)
+{
+    int length = (minSize >= GetNumBytes()) ? minSize : GetNumBytes();
+
+    if (_array)
+    {
+        delete[] _array;
+        _array = NULL;
+    }
+    _array = new uint8[length];
+
+    // If we need more bytes than length of BigNumber set the rest to 0
+    if (length > GetNumBytes())
+        memset((void*)_array, 0, length);
+    
+    BN_bn2bin(_bn, (unsigned char *)_array);
+
+    std::reverse(_array, _array + length);
+
+    return _array;
+}
+
+ByteBuffer BigNumber::AsByteBuffer()
+{
+    ByteBuffer ret(GetNumBytes());
+    ret.append(AsByteArray(), GetNumBytes());
+    return ret;
+}
+
+std::vector<uint8> BigNumber::AsByteVector()
+{
+    std::vector<uint8> ret;
+    ret.resize(GetNumBytes());
+    memcpy(&ret[0], AsByteArray(), GetNumBytes());
+    return ret;
+}
+
+const char *BigNumber::AsHexStr()
+{
+    return BN_bn2hex(_bn);
+}
+
+const char *BigNumber::AsDecStr()
+{
+    return BN_bn2dec(_bn);
+}