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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/mars.cpp
parentUpdated to V6 - "Stop" and "Progress report" functionality (diff)
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Diffstat (limited to 'CryptoPP/mars.cpp')
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diff --git a/CryptoPP/mars.cpp b/CryptoPP/mars.cpp
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+// mars.cpp - written and placed in the public domain by Wei Dai
+
+// includes IBM's key setup "tweak" proposed in August 1999 (http://www.research.ibm.com/security/key-setup.txt)
+
+#include "pch.h"
+#include "mars.h"
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void MARS::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &)
+{
+ AssertValidKeyLength(length);
+
+ // Initialize T[] with the key data
+ FixedSizeSecBlock<word32, 15> T;
+ GetUserKey(LITTLE_ENDIAN_ORDER, T.begin(), 15, userKey, length);
+ T[length/4] = length/4;
+
+ for (unsigned int j=0; j<4; j++) // compute 10 words of K[] in each iteration
+ {
+ unsigned int i;
+ // Do linear transformation
+ for (i=0; i<15; i++)
+ T[i] = T[i] ^ rotlFixed(T[(i+8)%15] ^ T[(i+13)%15], 3) ^ (4*i+j);
+
+ // Do four rounds of stirring
+ for (unsigned int k=0; k<4; k++)
+ for (i=0; i<15; i++)
+ T[i] = rotlFixed(T[i] + Sbox[T[(i+14)%15]%512], 9);
+
+ // Store next 10 key words into K[]
+ for (i=0; i<10; i++)
+ m_k[10*j+i] = T[4*i%15];
+ }
+
+ // Modify multiplication key-words
+ for(unsigned int i = 5; i < 37; i += 2)
+ {
+ word32 m, w = m_k[i] | 3;
+ m = (~w ^ (w<<1)) & (~w ^ (w>>1)) & 0x7ffffffe;
+ m &= m>>1; m &= m>>2; m &= m>>4;
+ m |= m<<1; m |= m<<2; m |= m<<4;
+ m &= 0x7ffffffc;
+ w ^= rotlMod(Sbox[265 + (m_k[i] & 3)], m_k[i-1]) & m;
+ m_k[i] = w;
+ }
+}
+
+#define S(a) Sbox[(a)&0x1ff]
+#define S0(a) Sbox[(a)&0xff]
+#define S1(a) Sbox[((a)&0xff) + 256]
+
+typedef BlockGetAndPut<word32, LittleEndian> Block;
+
+void MARS::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ unsigned int i;
+ word32 a, b, c, d, l, m, r, t;
+ const word32 *k = m_k;
+
+ Block::Get(inBlock)(a)(b)(c)(d);
+
+ a += k[0]; b += k[1]; c += k[2]; d += k[3];
+
+ for (i=0; i<8; i++)
+ {
+ b = (b ^ S0(a)) + S1(a>>8);
+ c += S0(a>>16);
+ a = rotrFixed(a, 24);
+ d ^= S1(a);
+ a += (i%4==0) ? d : 0;
+ a += (i%4==1) ? b : 0;
+ t = a; a = b; b = c; c = d; d = t;
+ }
+
+ for (i=0; i<16; i++)
+ {
+ t = rotlFixed(a, 13);
+ r = rotlFixed(t * k[2*i+5], 10);
+ m = a + k[2*i+4];
+ l = rotlMod((S(m) ^ rotrFixed(r, 5) ^ r), r);
+ c += rotlMod(m, rotrFixed(r, 5));
+ (i<8 ? b : d) += l;
+ (i<8 ? d : b) ^= r;
+ a = b; b = c; c = d; d = t;
+ }
+
+ for (i=0; i<8; i++)
+ {
+ a -= (i%4==2) ? d : 0;
+ a -= (i%4==3) ? b : 0;
+ b ^= S1(a);
+ c -= S0(a>>24);
+ t = rotlFixed(a, 24);
+ d = (d - S1(a>>16)) ^ S0(t);
+ a = b; b = c; c = d; d = t;
+ }
+
+ a -= k[36]; b -= k[37]; c -= k[38]; d -= k[39];
+
+ Block::Put(xorBlock, outBlock)(a)(b)(c)(d);
+}
+
+void MARS::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ unsigned int i;
+ word32 a, b, c, d, l, m, r, t;
+ const word32 *k = m_k;
+
+ Block::Get(inBlock)(d)(c)(b)(a);
+
+ d += k[36]; c += k[37]; b += k[38]; a += k[39];
+
+ for (i=0; i<8; i++)
+ {
+ b = (b ^ S0(a)) + S1(a>>8);
+ c += S0(a>>16);
+ a = rotrFixed(a, 24);
+ d ^= S1(a);
+ a += (i%4==0) ? d : 0;
+ a += (i%4==1) ? b : 0;
+ t = a; a = b; b = c; c = d; d = t;
+ }
+
+ for (i=0; i<16; i++)
+ {
+ t = rotrFixed(a, 13);
+ r = rotlFixed(a * k[35-2*i], 10);
+ m = t + k[34-2*i];
+ l = rotlMod((S(m) ^ rotrFixed(r, 5) ^ r), r);
+ c -= rotlMod(m, rotrFixed(r, 5));
+ (i<8 ? b : d) -= l;
+ (i<8 ? d : b) ^= r;
+ a = b; b = c; c = d; d = t;
+ }
+
+ for (i=0; i<8; i++)
+ {
+ a -= (i%4==2) ? d : 0;
+ a -= (i%4==3) ? b : 0;
+ b ^= S1(a);
+ c -= S0(a>>24);
+ t = rotlFixed(a, 24);
+ d = (d - S1(a>>16)) ^ S0(t);
+ a = b; b = c; c = d; d = t;
+ }
+
+ d -= k[0]; c -= k[1]; b -= k[2]; a -= k[3];
+
+ Block::Put(xorBlock, outBlock)(d)(c)(b)(a);
+}
+
+NAMESPACE_END