1 files changed, 201 insertions, 0 deletions
diff --git a/src/common/Cryptography/BigNumber.cpp b/src/common/Cryptography/BigNumber.cpp
new file mode 100644
index 00000000000..720e8e30441
--- /dev/null
+++ b/src/common/Cryptography/BigNumber.cpp
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2008-2015 TrinityCore <http://www.trinitycore.org/>
+ * Copyright (C) 2005-2009 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "Cryptography/BigNumber.h"
+#include <openssl/bn.h>
+#include <cstring>
+#include <algorithm>
+#include <memory>
+
+BigNumber::BigNumber()
+    : _bn(BN_new())
+{ }
+
+BigNumber::BigNumber(BigNumber const& bn)
+    : _bn(BN_dup(bn._bn))
+{ }
+
+BigNumber::BigNumber(uint32 val)
+    : _bn(BN_new())
+{
+    BN_set_word(_bn, val);
+}
+
+BigNumber::~BigNumber()
+{
+    BN_free(_bn);
+}
+
+void BigNumber::SetDword(uint32 val)
+{
+    BN_set_word(_bn, val);
+}
+
+void BigNumber::SetQword(uint64 val)
+{
+    BN_set_word(_bn, (uint32)(val >> 32));
+    BN_lshift(_bn, _bn, 32);
+    BN_add_word(_bn, (uint32)(val & 0xFFFFFFFF));
+}
+
+void BigNumber::SetBinary(uint8 const* bytes, int32 len)
+{
+    uint8* array = new uint8[len];
+
+    for (int i = 0; i < len; i++)
+        array[i] = bytes[len - 1 - i];
+
+    BN_bin2bn(array, len, _bn);
+
+    delete[] array;
+}
+
+void BigNumber::SetHexStr(char const* str)
+{
+    BN_hex2bn(&_bn, str);
+}
+
+void BigNumber::SetRand(int32 numbits)
+{
+    BN_rand(_bn, numbits, 0, 1);
+}
+
+BigNumber& BigNumber::operator=(BigNumber const& bn)
+{
+    if (this == &bn)
+        return *this;
+
+    BN_copy(_bn, bn._bn);
+    return *this;
+}
+
+BigNumber BigNumber::operator+=(BigNumber const& bn)
+{
+    BN_add(_bn, _bn, bn._bn);
+    return *this;
+}
+
+BigNumber BigNumber::operator-=(BigNumber const& bn)
+{
+    BN_sub(_bn, _bn, bn._bn);
+    return *this;
+}
+
+BigNumber BigNumber::operator*=(BigNumber const& bn)
+{
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_mul(_bn, _bn, bn._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return *this;
+}
+
+BigNumber BigNumber::operator/=(BigNumber const& 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%=(BigNumber const& bn)
+{
+    BN_CTX *bnctx;
+
+    bnctx = BN_CTX_new();
+    BN_mod(_bn, _bn, bn._bn, bnctx);
+    BN_CTX_free(bnctx);
+
+    return *this;
+}
+
+BigNumber BigNumber::Exp(BigNumber const& 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(BigNumber const& bn1, BigNumber const& 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;
+}
+
+int32 BigNumber::GetNumBytes(void)
+{
+    return BN_num_bytes(_bn);
+}
+
+uint32 BigNumber::AsDword()
+{
+    return (uint32)BN_get_word(_bn);
+}
+
+bool BigNumber::isZero() const
+{
+    return BN_is_zero(_bn);
+}
+
+std::unique_ptr<uint8[]> BigNumber::AsByteArray(int32 minSize, bool littleEndian)
+{
+    int numBytes = GetNumBytes();
+    int length = (minSize >= numBytes) ? minSize : numBytes;
+
+    uint8* array = new uint8[length];
+
+    // If we need more bytes than length of BigNumber set the rest to 0
+    if (length > numBytes)
+        memset((void*)array, 0, length);
+
+    BN_bn2bin(_bn, (unsigned char *)array);
+
+    // openssl's BN stores data internally in big endian format, reverse if little endian desired
+    if (littleEndian)
+        std::reverse(array, array + numBytes);
+
+    std::unique_ptr<uint8[]> ret(array);
+    return ret;
+}
+
+char * BigNumber::AsHexStr() const
+{
+    return BN_bn2hex(_bn);
+}
+
+char * BigNumber::AsDecStr() const
+{
+    return BN_bn2dec(_bn);
+}
+