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authormadmaxoft@gmail.com <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>2012-08-30 23:06:13 +0200
committermadmaxoft@gmail.com <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>2012-08-30 23:06:13 +0200
commit539364846a89987ac2679988653f50332cb91d26 (patch)
treef1695473c1f493a19c5fbdb70f7f1faccf99d7f3 /CryptoPP/gf256.cpp
parentUpdated to V6 - "Stop" and "Progress report" functionality (diff)
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Diffstat (limited to 'CryptoPP/gf256.cpp')
-rw-r--r--CryptoPP/gf256.cpp34
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diff --git a/CryptoPP/gf256.cpp b/CryptoPP/gf256.cpp
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+// gf256.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "gf256.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+GF256::Element GF256::Multiply(Element a, Element b) const
+{
+ word result = 0, t = b;
+
+ for (unsigned int i=0; i<8; i++)
+ {
+ result <<= 1;
+ if (result & 0x100)
+ result ^= m_modulus;
+
+ t <<= 1;
+ if (t & 0x100)
+ result ^= a;
+ }
+
+ return (GF256::Element) result;
+}
+
+GF256::Element GF256::MultiplicativeInverse(Element a) const
+{
+ Element result = a;
+ for (int i=1; i<7; i++)
+ result = Multiply(Square(result), a);
+ return Square(result);
+}
+
+NAMESPACE_END