00001
00002
00003
00004 #include "pch.h"
00005 #include "cast.h"
00006 #include "misc.h"
00007
00008 NAMESPACE_BEGIN(CryptoPP)
00009
00010
00011 #define U8a(x) GETBYTE(x,3)
00012 #define U8b(x) GETBYTE(x,2)
00013 #define U8c(x) GETBYTE(x,1)
00014 #define U8d(x) GETBYTE(x,0)
00015
00016
00017 #define f1(l, r, km, kr) \
00018 t = rotlVariable(km + r, kr); \
00019 l ^= ((S[0][U8a(t)] ^ S[1][U8b(t)]) - \
00020 S[2][U8c(t)]) + S[3][U8d(t)];
00021 #define f2(l, r, km, kr) \
00022 t = rotlVariable(km ^ r, kr); \
00023 l ^= ((S[0][U8a(t)] - S[1][U8b(t)]) + \
00024 S[2][U8c(t)]) ^ S[3][U8d(t)];
00025 #define f3(l, r, km, kr) \
00026 t = rotlVariable(km - r, kr); \
00027 l ^= ((S[0][U8a(t)] + S[1][U8b(t)]) ^ \
00028 S[2][U8c(t)]) - S[3][U8d(t)];
00029
00030 #define F1(l, r, i, j) f1(l, r, K[i], K[i+j])
00031 #define F2(l, r, i, j) f2(l, r, K[i], K[i+j])
00032 #define F3(l, r, i, j) f3(l, r, K[i], K[i+j])
00033
00034 typedef BlockGetAndPut<word32, BigEndian> Block;
00035
00036 void CAST128::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
00037 {
00038 word32 t, l, r;
00039
00040
00041 Block::Get(inBlock)(l)(r);
00042
00043 F1(l, r, 0, 16);
00044 F2(r, l, 1, 16);
00045 F3(l, r, 2, 16);
00046 F1(r, l, 3, 16);
00047 F2(l, r, 4, 16);
00048 F3(r, l, 5, 16);
00049 F1(l, r, 6, 16);
00050 F2(r, l, 7, 16);
00051 F3(l, r, 8, 16);
00052 F1(r, l, 9, 16);
00053 F2(l, r, 10, 16);
00054 F3(r, l, 11, 16);
00055
00056 if (!reduced) {
00057 F1(l, r, 12, 16);
00058 F2(r, l, 13, 16);
00059 F3(l, r, 14, 16);
00060 F1(r, l, 15, 16);
00061 }
00062
00063 Block::Put(xorBlock, outBlock)(r)(l);
00064 }
00065
00066 void CAST128::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
00067 {
00068 word32 t, l, r;
00069
00070
00071 Block::Get(inBlock)(r)(l);
00072
00073 if (!reduced) {
00074 F1(r, l, 15, 16);
00075 F3(l, r, 14, 16);
00076 F2(r, l, 13, 16);
00077 F1(l, r, 12, 16);
00078 }
00079 F3(r, l, 11, 16);
00080 F2(l, r, 10, 16);
00081 F1(r, l, 9, 16);
00082 F3(l, r, 8, 16);
00083 F2(r, l, 7, 16);
00084 F1(l, r, 6, 16);
00085 F3(r, l, 5, 16);
00086 F2(l, r, 4, 16);
00087 F1(r, l, 3, 16);
00088 F3(l, r, 2, 16);
00089 F2(r, l, 1, 16);
00090 F1(l, r, 0, 16);
00091
00092 Block::Put(xorBlock, outBlock)(l)(r);
00093
00094 t = l = r = 0;
00095 }
00096
00097 void CAST128::Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &)
00098 {
00099 AssertValidKeyLength(keylength);
00100
00101 reduced = (keylength <= 10);
00102
00103 word32 X[4], Z[4];
00104 GetUserKey(BIG_ENDIAN_ORDER, X, 4, userKey, keylength);
00105
00106 #define x(i) GETBYTE(X[i/4], 3-i%4)
00107 #define z(i) GETBYTE(Z[i/4], 3-i%4)
00108
00109 unsigned int i;
00110 for (i=0; i<=16; i+=16)
00111 {
00112
00113 Z[0] = X[0] ^ S[4][x(0xD)] ^ S[5][x(0xF)] ^ S[6][x(0xC)] ^ S[7][x(0xE)] ^ S[6][x(0x8)];
00114 Z[1] = X[2] ^ S[4][z(0x0)] ^ S[5][z(0x2)] ^ S[6][z(0x1)] ^ S[7][z(0x3)] ^ S[7][x(0xA)];
00115 Z[2] = X[3] ^ S[4][z(0x7)] ^ S[5][z(0x6)] ^ S[6][z(0x5)] ^ S[7][z(0x4)] ^ S[4][x(0x9)];
00116 Z[3] = X[1] ^ S[4][z(0xA)] ^ S[5][z(0x9)] ^ S[6][z(0xB)] ^ S[7][z(0x8)] ^ S[5][x(0xB)];
00117 K[i+0] = S[4][z(0x8)] ^ S[5][z(0x9)] ^ S[6][z(0x7)] ^ S[7][z(0x6)] ^ S[4][z(0x2)];
00118 K[i+1] = S[4][z(0xA)] ^ S[5][z(0xB)] ^ S[6][z(0x5)] ^ S[7][z(0x4)] ^ S[5][z(0x6)];
00119 K[i+2] = S[4][z(0xC)] ^ S[5][z(0xD)] ^ S[6][z(0x3)] ^ S[7][z(0x2)] ^ S[6][z(0x9)];
00120 K[i+3] = S[4][z(0xE)] ^ S[5][z(0xF)] ^ S[6][z(0x1)] ^ S[7][z(0x0)] ^ S[7][z(0xC)];
00121 X[0] = Z[2] ^ S[4][z(0x5)] ^ S[5][z(0x7)] ^ S[6][z(0x4)] ^ S[7][z(0x6)] ^ S[6][z(0x0)];
00122 X[1] = Z[0] ^ S[4][x(0x0)] ^ S[5][x(0x2)] ^ S[6][x(0x1)] ^ S[7][x(0x3)] ^ S[7][z(0x2)];
00123 X[2] = Z[1] ^ S[4][x(0x7)] ^ S[5][x(0x6)] ^ S[6][x(0x5)] ^ S[7][x(0x4)] ^ S[4][z(0x1)];
00124 X[3] = Z[3] ^ S[4][x(0xA)] ^ S[5][x(0x9)] ^ S[6][x(0xB)] ^ S[7][x(0x8)] ^ S[5][z(0x3)];
00125 K[i+4] = S[4][x(0x3)] ^ S[5][x(0x2)] ^ S[6][x(0xC)] ^ S[7][x(0xD)] ^ S[4][x(0x8)];
00126 K[i+5] = S[4][x(0x1)] ^ S[5][x(0x0)] ^ S[6][x(0xE)] ^ S[7][x(0xF)] ^ S[5][x(0xD)];
00127 K[i+6] = S[4][x(0x7)] ^ S[5][x(0x6)] ^ S[6][x(0x8)] ^ S[7][x(0x9)] ^ S[6][x(0x3)];
00128 K[i+7] = S[4][x(0x5)] ^ S[5][x(0x4)] ^ S[6][x(0xA)] ^ S[7][x(0xB)] ^ S[7][x(0x7)];
00129 Z[0] = X[0] ^ S[4][x(0xD)] ^ S[5][x(0xF)] ^ S[6][x(0xC)] ^ S[7][x(0xE)] ^ S[6][x(0x8)];
00130 Z[1] = X[2] ^ S[4][z(0x0)] ^ S[5][z(0x2)] ^ S[6][z(0x1)] ^ S[7][z(0x3)] ^ S[7][x(0xA)];
00131 Z[2] = X[3] ^ S[4][z(0x7)] ^ S[5][z(0x6)] ^ S[6][z(0x5)] ^ S[7][z(0x4)] ^ S[4][x(0x9)];
00132 Z[3] = X[1] ^ S[4][z(0xA)] ^ S[5][z(0x9)] ^ S[6][z(0xB)] ^ S[7][z(0x8)] ^ S[5][x(0xB)];
00133 K[i+8] = S[4][z(0x3)] ^ S[5][z(0x2)] ^ S[6][z(0xC)] ^ S[7][z(0xD)] ^ S[4][z(0x9)];
00134 K[i+9] = S[4][z(0x1)] ^ S[5][z(0x0)] ^ S[6][z(0xE)] ^ S[7][z(0xF)] ^ S[5][z(0xC)];
00135 K[i+10] = S[4][z(0x7)] ^ S[5][z(0x6)] ^ S[6][z(0x8)] ^ S[7][z(0x9)] ^ S[6][z(0x2)];
00136 K[i+11] = S[4][z(0x5)] ^ S[5][z(0x4)] ^ S[6][z(0xA)] ^ S[7][z(0xB)] ^ S[7][z(0x6)];
00137 X[0] = Z[2] ^ S[4][z(0x5)] ^ S[5][z(0x7)] ^ S[6][z(0x4)] ^ S[7][z(0x6)] ^ S[6][z(0x0)];
00138 X[1] = Z[0] ^ S[4][x(0x0)] ^ S[5][x(0x2)] ^ S[6][x(0x1)] ^ S[7][x(0x3)] ^ S[7][z(0x2)];
00139 X[2] = Z[1] ^ S[4][x(0x7)] ^ S[5][x(0x6)] ^ S[6][x(0x5)] ^ S[7][x(0x4)] ^ S[4][z(0x1)];
00140 X[3] = Z[3] ^ S[4][x(0xA)] ^ S[5][x(0x9)] ^ S[6][x(0xB)] ^ S[7][x(0x8)] ^ S[5][z(0x3)];
00141 K[i+12] = S[4][x(0x8)] ^ S[5][x(0x9)] ^ S[6][x(0x7)] ^ S[7][x(0x6)] ^ S[4][x(0x3)];
00142 K[i+13] = S[4][x(0xA)] ^ S[5][x(0xB)] ^ S[6][x(0x5)] ^ S[7][x(0x4)] ^ S[5][x(0x7)];
00143 K[i+14] = S[4][x(0xC)] ^ S[5][x(0xD)] ^ S[6][x(0x3)] ^ S[7][x(0x2)] ^ S[6][x(0x8)];
00144 K[i+15] = S[4][x(0xE)] ^ S[5][x(0xF)] ^ S[6][x(0x1)] ^ S[7][x(0x0)] ^ S[7][x(0xD)];
00145 }
00146
00147 for (i=16; i<32; i++)
00148 K[i] &= 0x1f;
00149 }
00150
00151
00152
00153 const word32 CAST256::Base::t_m[8][24]={
00154 { 0x5a827999, 0xd151d6a1, 0x482133a9, 0xbef090b1, 0x35bfedb9, 0xac8f4ac1,
00155 0x235ea7c9, 0x9a2e04d1, 0x10fd61d9, 0x87ccbee1, 0xfe9c1be9, 0x756b78f1,
00156 0xec3ad5f9, 0x630a3301, 0xd9d99009, 0x50a8ed11, 0xc7784a19, 0x3e47a721,
00157 0xb5170429, 0x2be66131, 0xa2b5be39, 0x19851b41, 0x90547849, 0x0723d551},
00158 { 0xc95c653a, 0x402bc242, 0xb6fb1f4a, 0x2dca7c52, 0xa499d95a, 0x1b693662,
00159 0x9238936a, 0x0907f072, 0x7fd74d7a, 0xf6a6aa82, 0x6d76078a, 0xe4456492,
00160 0x5b14c19a, 0xd1e41ea2, 0x48b37baa, 0xbf82d8b2, 0x365235ba, 0xad2192c2,
00161 0x23f0efca, 0x9ac04cd2, 0x118fa9da, 0x885f06e2, 0xff2e63ea, 0x75fdc0f2},
00162 { 0x383650db, 0xaf05ade3, 0x25d50aeb, 0x9ca467f3, 0x1373c4fb, 0x8a432203,
00163 0x01127f0b, 0x77e1dc13, 0xeeb1391b, 0x65809623, 0xdc4ff32b, 0x531f5033,
00164 0xc9eead3b, 0x40be0a43, 0xb78d674b, 0x2e5cc453, 0xa52c215b, 0x1bfb7e63,
00165 0x92cadb6b, 0x099a3873, 0x8069957b, 0xf738f283, 0x6e084f8b, 0xe4d7ac93},
00166 { 0xa7103c7c, 0x1ddf9984, 0x94aef68c, 0x0b7e5394, 0x824db09c, 0xf91d0da4,
00167 0x6fec6aac, 0xe6bbc7b4, 0x5d8b24bc, 0xd45a81c4, 0x4b29decc, 0xc1f93bd4,
00168 0x38c898dc, 0xaf97f5e4, 0x266752ec, 0x9d36aff4, 0x14060cfc, 0x8ad56a04,
00169 0x01a4c70c, 0x78742414, 0xef43811c, 0x6612de24, 0xdce23b2c, 0x53b19834},
00170 { 0x15ea281d, 0x8cb98525, 0x0388e22d, 0x7a583f35, 0xf1279c3d, 0x67f6f945,
00171 0xdec6564d, 0x5595b355, 0xcc65105d, 0x43346d65, 0xba03ca6d, 0x30d32775,
00172 0xa7a2847d, 0x1e71e185, 0x95413e8d, 0x0c109b95, 0x82dff89d, 0xf9af55a5,
00173 0x707eb2ad, 0xe74e0fb5, 0x5e1d6cbd, 0xd4ecc9c5, 0x4bbc26cd, 0xc28b83d5},
00174 { 0x84c413be, 0xfb9370c6, 0x7262cdce, 0xe9322ad6, 0x600187de, 0xd6d0e4e6,
00175 0x4da041ee, 0xc46f9ef6, 0x3b3efbfe, 0xb20e5906, 0x28ddb60e, 0x9fad1316,
00176 0x167c701e, 0x8d4bcd26, 0x041b2a2e, 0x7aea8736, 0xf1b9e43e, 0x68894146,
00177 0xdf589e4e, 0x5627fb56, 0xccf7585e, 0x43c6b566, 0xba96126e, 0x31656f76},
00178 { 0xf39dff5f, 0x6a6d5c67, 0xe13cb96f, 0x580c1677, 0xcedb737f, 0x45aad087,
00179 0xbc7a2d8f, 0x33498a97, 0xaa18e79f, 0x20e844a7, 0x97b7a1af, 0x0e86feb7,
00180 0x85565bbf, 0xfc25b8c7, 0x72f515cf, 0xe9c472d7, 0x6093cfdf, 0xd7632ce7,
00181 0x4e3289ef, 0xc501e6f7, 0x3bd143ff, 0xb2a0a107, 0x296ffe0f, 0xa03f5b17},
00182 { 0x6277eb00, 0xd9474808, 0x5016a510, 0xc6e60218, 0x3db55f20, 0xb484bc28,
00183 0x2b541930, 0xa2237638, 0x18f2d340, 0x8fc23048, 0x06918d50, 0x7d60ea58,
00184 0xf4304760, 0x6affa468, 0xe1cf0170, 0x589e5e78, 0xcf6dbb80, 0x463d1888,
00185 0xbd0c7590, 0x33dbd298, 0xaaab2fa0, 0x217a8ca8, 0x9849e9b0, 0x0f1946b8}
00186 };
00187
00188 const unsigned int CAST256::Base::t_r[8][24]={
00189 {19, 27, 3, 11, 19, 27, 3, 11, 19, 27, 3, 11, 19, 27, 3, 11, 19, 27, 3, 11, 19, 27, 3, 11},
00190 {4, 12, 20, 28, 4, 12, 20, 28, 4, 12, 20, 28, 4, 12, 20, 28, 4, 12, 20, 28, 4, 12, 20, 28},
00191 {21, 29, 5, 13, 21, 29, 5, 13, 21, 29, 5, 13, 21, 29, 5, 13, 21, 29, 5, 13, 21, 29, 5, 13},
00192 {6, 14, 22, 30, 6, 14, 22, 30, 6, 14, 22, 30, 6, 14, 22, 30, 6, 14, 22, 30, 6, 14, 22, 30},
00193 {23, 31, 7, 15, 23, 31, 7, 15, 23, 31, 7, 15, 23, 31, 7, 15, 23, 31, 7, 15, 23, 31, 7, 15},
00194 {8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0},
00195 {25, 1, 9, 17, 25, 1, 9, 17, 25, 1, 9, 17, 25, 1, 9, 17, 25, 1, 9, 17, 25, 1, 9, 17},
00196 {10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2}
00197 };
00198
00199 #define Q(i) \
00200 F1(block[2],block[3],8*i+4,-4); \
00201 F2(block[1],block[2],8*i+5,-4); \
00202 F3(block[0],block[1],8*i+6,-4); \
00203 F1(block[3],block[0],8*i+7,-4);
00204
00205 #define QBar(i) \
00206 F1(block[3],block[0],8*i+7,-4); \
00207 F3(block[0],block[1],8*i+6,-4); \
00208 F2(block[1],block[2],8*i+5,-4); \
00209 F1(block[2],block[3],8*i+4,-4);
00210
00211
00212
00213
00214 void CAST256::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
00215 {
00216 word32 t, block[4];
00217 Block::Get(inBlock)(block[0])(block[1])(block[2])(block[3]);
00218
00219
00220 Q(0);
00221 Q(1);
00222 Q(2);
00223 Q(3);
00224 Q(4);
00225 Q(5);
00226
00227
00228 QBar(6);
00229 QBar(7);
00230 QBar(8);
00231 QBar(9);
00232 QBar(10);
00233 QBar(11);
00234
00235 Block::Put(xorBlock, outBlock)(block[0])(block[1])(block[2])(block[3]);
00236 }
00237
00238
00239
00240 void CAST256::Base::Omega(int i, word32 kappa[8])
00241 {
00242 word32 t;
00243
00244 f1(kappa[6],kappa[7],t_m[0][i],t_r[0][i]);
00245 f2(kappa[5],kappa[6],t_m[1][i],t_r[1][i]);
00246 f3(kappa[4],kappa[5],t_m[2][i],t_r[2][i]);
00247 f1(kappa[3],kappa[4],t_m[3][i],t_r[3][i]);
00248 f2(kappa[2],kappa[3],t_m[4][i],t_r[4][i]);
00249 f3(kappa[1],kappa[2],t_m[5][i],t_r[5][i]);
00250 f1(kappa[0],kappa[1],t_m[6][i],t_r[6][i]);
00251 f2(kappa[7],kappa[0],t_m[7][i],t_r[7][i]);
00252 }
00253
00254 void CAST256::Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &)
00255 {
00256 AssertValidKeyLength(keylength);
00257
00258 word32 kappa[8];
00259 GetUserKey(BIG_ENDIAN_ORDER, kappa, 8, userKey, keylength);
00260
00261 for(int i=0; i<12; ++i)
00262 {
00263 Omega(2*i,kappa);
00264 Omega(2*i+1,kappa);
00265
00266 K[8*i]=kappa[0] & 31;
00267 K[8*i+1]=kappa[2] & 31;
00268 K[8*i+2]=kappa[4] & 31;
00269 K[8*i+3]=kappa[6] & 31;
00270 K[8*i+4]=kappa[7];
00271 K[8*i+5]=kappa[5];
00272 K[8*i+6]=kappa[3];
00273 K[8*i+7]=kappa[1];
00274 }
00275
00276 if (!IsForwardTransformation())
00277 {
00278 for(int j=0; j<6; ++j)
00279 {
00280 for(int i=0; i<4; ++i)
00281 {
00282 int i1=8*j+i;
00283 int i2=8*(11-j)+i;
00284
00285 assert(i1<i2);
00286
00287 std::swap(K[i1],K[i2]);
00288 std::swap(K[i1+4],K[i2+4]);
00289 }
00290 }
00291 }
00292
00293 memset(kappa, 0, sizeof(kappa));
00294 }
00295
00296 NAMESPACE_END