📄 cast.c
字号:
0x2711FD60UL, 0x438050E3UL, 0x069908A8UL, 0x3D7FEDC4UL,
0x826D2BEFUL, 0x4EEB8476UL, 0x488DCF25UL, 0x36C9D566UL,
0x28E74E41UL, 0xC2610ACAUL, 0x3D49A9CFUL, 0xBAE3B9DFUL,
0xB65F8DE6UL, 0x92AEAF64UL, 0x3AC7D5E6UL, 0x9EA80509UL,
0xF22B017DUL, 0xA4173F70UL, 0xDD1E16C3UL, 0x15E0D7F9UL,
0x50B1B887UL, 0x2B9F4FD5UL, 0x625ABA82UL, 0x6A017962UL,
0x2EC01B9CUL, 0x15488AA9UL, 0xD716E740UL, 0x40055A2CUL,
0x93D29A22UL, 0xE32DBF9AUL, 0x058745B9UL, 0x3453DC1EUL,
0xD699296EUL, 0x496CFF6FUL, 0x1C9F4986UL, 0xDFE2ED07UL,
0xB87242D1UL, 0x19DE7EAEUL, 0x053E561AUL, 0x15AD6F8CUL,
0x66626C1CUL, 0x7154C24CUL, 0xEA082B2AUL, 0x93EB2939UL,
0x17DCB0F0UL, 0x58D4F2AEUL, 0x9EA294FBUL, 0x52CF564CUL,
0x9883FE66UL, 0x2EC40581UL, 0x763953C3UL, 0x01D6692EUL,
0xD3A0C108UL, 0xA1E7160EUL, 0xE4F2DFA6UL, 0x693ED285UL,
0x74904698UL, 0x4C2B0EDDUL, 0x4F757656UL, 0x5D393378UL,
0xA132234FUL, 0x3D321C5DUL, 0xC3F5E194UL, 0x4B269301UL,
0xC79F022FUL, 0x3C997E7EUL, 0x5E4F9504UL, 0x3FFAFBBDUL,
0x76F7AD0EUL, 0x296693F4UL, 0x3D1FCE6FUL, 0xC61E45BEUL,
0xD3B5AB34UL, 0xF72BF9B7UL, 0x1B0434C0UL, 0x4E72B567UL,
0x5592A33DUL, 0xB5229301UL, 0xCFD2A87FUL, 0x60AEB767UL,
0x1814386BUL, 0x30BCC33DUL, 0x38A0C07DUL, 0xFD1606F2UL,
0xC363519BUL, 0x589DD390UL, 0x5479F8E6UL, 0x1CB8D647UL,
0x97FD61A9UL, 0xEA7759F4UL, 0x2D57539DUL, 0x569A58CFUL,
0xE84E63ADUL, 0x462E1B78UL, 0x6580F87EUL, 0xF3817914UL,
0x91DA55F4UL, 0x40A230F3UL, 0xD1988F35UL, 0xB6E318D2UL,
0x3FFA50BCUL, 0x3D40F021UL, 0xC3C0BDAEUL, 0x4958C24CUL,
0x518F36B2UL, 0x84B1D370UL, 0x0FEDCE83UL, 0x878DDADAUL,
0xF2A279C7UL, 0x94E01BE8UL, 0x90716F4BUL, 0x954B8AA3UL
},
{
0xE216300DUL, 0xBBDDFFFCUL, 0xA7EBDABDUL, 0x35648095UL,
0x7789F8B7UL, 0xE6C1121BUL, 0x0E241600UL, 0x052CE8B5UL,
0x11A9CFB0UL, 0xE5952F11UL, 0xECE7990AUL, 0x9386D174UL,
0x2A42931CUL, 0x76E38111UL, 0xB12DEF3AUL, 0x37DDDDFCUL,
0xDE9ADEB1UL, 0x0A0CC32CUL, 0xBE197029UL, 0x84A00940UL,
0xBB243A0FUL, 0xB4D137CFUL, 0xB44E79F0UL, 0x049EEDFDUL,
0x0B15A15DUL, 0x480D3168UL, 0x8BBBDE5AUL, 0x669DED42UL,
0xC7ECE831UL, 0x3F8F95E7UL, 0x72DF191BUL, 0x7580330DUL,
0x94074251UL, 0x5C7DCDFAUL, 0xABBE6D63UL, 0xAA402164UL,
0xB301D40AUL, 0x02E7D1CAUL, 0x53571DAEUL, 0x7A3182A2UL,
0x12A8DDECUL, 0xFDAA335DUL, 0x176F43E8UL, 0x71FB46D4UL,
0x38129022UL, 0xCE949AD4UL, 0xB84769ADUL, 0x965BD862UL,
0x82F3D055UL, 0x66FB9767UL, 0x15B80B4EUL, 0x1D5B47A0UL,
0x4CFDE06FUL, 0xC28EC4B8UL, 0x57E8726EUL, 0x647A78FCUL,
0x99865D44UL, 0x608BD593UL, 0x6C200E03UL, 0x39DC5FF6UL,
0x5D0B00A3UL, 0xAE63AFF2UL, 0x7E8BD632UL, 0x70108C0CUL,
0xBBD35049UL, 0x2998DF04UL, 0x980CF42AUL, 0x9B6DF491UL,
0x9E7EDD53UL, 0x06918548UL, 0x58CB7E07UL, 0x3B74EF2EUL,
0x522FFFB1UL, 0xD24708CCUL, 0x1C7E27CDUL, 0xA4EB215BUL,
0x3CF1D2E2UL, 0x19B47A38UL, 0x424F7618UL, 0x35856039UL,
0x9D17DEE7UL, 0x27EB35E6UL, 0xC9AFF67BUL, 0x36BAF5B8UL,
0x09C467CDUL, 0xC18910B1UL, 0xE11DBF7BUL, 0x06CD1AF8UL,
0x7170C608UL, 0x2D5E3354UL, 0xD4DE495AUL, 0x64C6D006UL,
0xBCC0C62CUL, 0x3DD00DB3UL, 0x708F8F34UL, 0x77D51B42UL,
0x264F620FUL, 0x24B8D2BFUL, 0x15C1B79EUL, 0x46A52564UL,
0xF8D7E54EUL, 0x3E378160UL, 0x7895CDA5UL, 0x859C15A5UL,
0xE6459788UL, 0xC37BC75FUL, 0xDB07BA0CUL, 0x0676A3ABUL,
0x7F229B1EUL, 0x31842E7BUL, 0x24259FD7UL, 0xF8BEF472UL,
0x835FFCB8UL, 0x6DF4C1F2UL, 0x96F5B195UL, 0xFD0AF0FCUL,
0xB0FE134CUL, 0xE2506D3DUL, 0x4F9B12EAUL, 0xF215F225UL,
0xA223736FUL, 0x9FB4C428UL, 0x25D04979UL, 0x34C713F8UL,
0xC4618187UL, 0xEA7A6E98UL, 0x7CD16EFCUL, 0x1436876CUL,
0xF1544107UL, 0xBEDEEE14UL, 0x56E9AF27UL, 0xA04AA441UL,
0x3CF7C899UL, 0x92ECBAE6UL, 0xDD67016DUL, 0x151682EBUL,
0xA842EEDFUL, 0xFDBA60B4UL, 0xF1907B75UL, 0x20E3030FUL,
0x24D8C29EUL, 0xE139673BUL, 0xEFA63FB8UL, 0x71873054UL,
0xB6F2CF3BUL, 0x9F326442UL, 0xCB15A4CCUL, 0xB01A4504UL,
0xF1E47D8DUL, 0x844A1BE5UL, 0xBAE7DFDCUL, 0x42CBDA70UL,
0xCD7DAE0AUL, 0x57E85B7AUL, 0xD53F5AF6UL, 0x20CF4D8CUL,
0xCEA4D428UL, 0x79D130A4UL, 0x3486EBFBUL, 0x33D3CDDCUL,
0x77853B53UL, 0x37EFFCB5UL, 0xC5068778UL, 0xE580B3E6UL,
0x4E68B8F4UL, 0xC5C8B37EUL, 0x0D809EA2UL, 0x398FEB7CUL,
0x132A4F94UL, 0x43B7950EUL, 0x2FEE7D1CUL, 0x223613BDUL,
0xDD06CAA2UL, 0x37DF932BUL, 0xC4248289UL, 0xACF3EBC3UL,
0x5715F6B7UL, 0xEF3478DDUL, 0xF267616FUL, 0xC148CBE4UL,
0x9052815EUL, 0x5E410FABUL, 0xB48A2465UL, 0x2EDA7FA4UL,
0xE87B40E4UL, 0xE98EA084UL, 0x5889E9E1UL, 0xEFD390FCUL,
0xDD07D35BUL, 0xDB485694UL, 0x38D7E5B2UL, 0x57720101UL,
0x730EDEBCUL, 0x5B643113UL, 0x94917E4FUL, 0x503C2FBAUL,
0x646F1282UL, 0x7523D24AUL, 0xE0779695UL, 0xF9C17A8FUL,
0x7A5B2121UL, 0xD187B896UL, 0x29263A4DUL, 0xBA510CDFUL,
0x81F47C9FUL, 0xAD1163EDUL, 0xEA7B5965UL, 0x1A00726EUL,
0x11403092UL, 0x00DA6D77UL, 0x4A0CDD61UL, 0xAD1F4603UL,
0x605BDFB0UL, 0x9EEDC364UL, 0x22EBE6A8UL, 0xCEE7D28AUL,
0xA0E736A0UL, 0x5564A6B9UL, 0x10853209UL, 0xC7EB8F37UL,
0x2DE705CAUL, 0x8951570FUL, 0xDF09822BUL, 0xBD691A6CUL,
0xAA12E4F2UL, 0x87451C0FUL, 0xE0F6A27AUL, 0x3ADA4819UL,
0x4CF1764FUL, 0x0D771C2BUL, 0x67CDB156UL, 0x350D8384UL,
0x5938FA0FUL, 0x42399EF3UL, 0x36997B07UL, 0x0E84093DUL,
0x4AA93E61UL, 0x8360D87BUL, 0x1FA98B0CUL, 0x1149382CUL,
0xE97625A5UL, 0x0614D1B7UL, 0x0E25244BUL, 0x0C768347UL,
0x589E8D82UL, 0x0D2059D1UL, 0xA466BB1EUL, 0xF8DA0A82UL,
0x04F19130UL, 0xBA6E4EC0UL, 0x99265164UL, 0x1EE7230DUL,
0x50B2AD80UL, 0xEAEE6801UL, 0x8DB2A283UL, 0xEA8BF59EUL
}};
/* CAST uses three different round functions */
#define f1(l, r, km, kr) \
t = rotlVariable(km + r, kr); \
l ^= ((S[0][U8a(t)] ^ S[1][U8b(t)]) - \
S[2][U8c(t)]) + S[3][U8d(t)];
#define f2(l, r, km, kr) \
t = rotlVariable(km ^ r, kr); \
l ^= ((S[0][U8a(t)] - S[1][U8b(t)]) + \
S[2][U8c(t)]) ^ S[3][U8d(t)];
#define f3(l, r, km, kr) \
t = rotlVariable(km - r, kr); \
l ^= ((S[0][U8a(t)] + S[1][U8b(t)]) ^ \
S[2][U8c(t)]) - S[3][U8d(t)];
#define F1(l, r, i, j) f1(l, r, K[i], K[i+j])
#define F2(l, r, i, j) f2(l, r, K[i], K[i+j])
#define F3(l, r, i, j) f3(l, r, K[i], K[i+j])
void Cast5Encrypt (const byte *inBlock, byte *outBlock, CAST_KEY *key)
{
word32 l = BE32 (((word32 *)inBlock)[0]);
word32 r = BE32 (((word32 *)inBlock)[1]);
word32 *K = key->K;
word32 t;
/* Do the work */
F1(l, r, 0, 16);
F2(r, l, 1, 16);
F3(l, r, 2, 16);
F1(r, l, 3, 16);
F2(l, r, 4, 16);
F3(r, l, 5, 16);
F1(l, r, 6, 16);
F2(r, l, 7, 16);
F3(l, r, 8, 16);
F1(r, l, 9, 16);
F2(l, r, 10, 16);
F3(r, l, 11, 16);
F1(l, r, 12, 16);
F2(r, l, 13, 16);
F3(l, r, 14, 16);
F1(r, l, 15, 16);
/* Put l,r into outblock */
((word32 *)outBlock)[0] = BE32 (r);
((word32 *)outBlock)[1] = BE32 (l);
}
void Cast5Decrypt (const byte *inBlock, byte *outBlock, CAST_KEY *key)
{
word32 r = BE32 (((word32 *)inBlock)[0]);
word32 l = BE32 (((word32 *)inBlock)[1]);
word32 *K = key->K;
word32 t;
/* Only do full 16 rounds if key length > 80 bits */
F1(r, l, 15, 16);
F3(l, r, 14, 16);
F2(r, l, 13, 16);
F1(l, r, 12, 16);
F3(r, l, 11, 16);
F2(l, r, 10, 16);
F1(r, l, 9, 16);
F3(l, r, 8, 16);
F2(r, l, 7, 16);
F1(l, r, 6, 16);
F3(r, l, 5, 16);
F2(l, r, 4, 16);
F1(r, l, 3, 16);
F3(l, r, 2, 16);
F2(r, l, 1, 16);
F1(l, r, 0, 16);
/* Put l,r into outblock */
((word32 *)outBlock)[0] = BE32 (l);
((word32 *)outBlock)[1] = BE32 (r);
/* Wipe clean */
t = l = r = 0;
}
void Cast5SetKey (CAST_KEY *key, unsigned int keylength, const byte *userKey)
{
unsigned int i;
word32 *K = key->K;
word32 X[4], Z[4];
X[0] = BE32 (((word32 *)userKey)[0]);
X[1] = BE32 (((word32 *)userKey)[1]);
X[2] = BE32 (((word32 *)userKey)[2]);
X[3] = BE32 (((word32 *)userKey)[3]);
#define x(i) GETBYTE(X[i/4], 3-i%4)
#define z(i) GETBYTE(Z[i/4], 3-i%4)
for (i=0; i<=16; i+=16)
{
// this part is copied directly from RFC 2144 (with some search and replace) by Wei Dai
Z[0] = X[0] ^ S[4][x(0xD)] ^ S[5][x(0xF)] ^ S[6][x(0xC)] ^ S[7][x(0xE)] ^ S[6][x(0x8)];
Z[1] = X[2] ^ S[4][z(0x0)] ^ S[5][z(0x2)] ^ S[6][z(0x1)] ^ S[7][z(0x3)] ^ S[7][x(0xA)];
Z[2] = X[3] ^ S[4][z(0x7)] ^ S[5][z(0x6)] ^ S[6][z(0x5)] ^ S[7][z(0x4)] ^ S[4][x(0x9)];
Z[3] = X[1] ^ S[4][z(0xA)] ^ S[5][z(0x9)] ^ S[6][z(0xB)] ^ S[7][z(0x8)] ^ S[5][x(0xB)];
K[i+0] = S[4][z(0x8)] ^ S[5][z(0x9)] ^ S[6][z(0x7)] ^ S[7][z(0x6)] ^ S[4][z(0x2)];
K[i+1] = S[4][z(0xA)] ^ S[5][z(0xB)] ^ S[6][z(0x5)] ^ S[7][z(0x4)] ^ S[5][z(0x6)];
K[i+2] = S[4][z(0xC)] ^ S[5][z(0xD)] ^ S[6][z(0x3)] ^ S[7][z(0x2)] ^ S[6][z(0x9)];
K[i+3] = S[4][z(0xE)] ^ S[5][z(0xF)] ^ S[6][z(0x1)] ^ S[7][z(0x0)] ^ S[7][z(0xC)];
X[0] = Z[2] ^ S[4][z(0x5)] ^ S[5][z(0x7)] ^ S[6][z(0x4)] ^ S[7][z(0x6)] ^ S[6][z(0x0)];
X[1] = Z[0] ^ S[4][x(0x0)] ^ S[5][x(0x2)] ^ S[6][x(0x1)] ^ S[7][x(0x3)] ^ S[7][z(0x2)];
X[2] = Z[1] ^ S[4][x(0x7)] ^ S[5][x(0x6)] ^ S[6][x(0x5)] ^ S[7][x(0x4)] ^ S[4][z(0x1)];
X[3] = Z[3] ^ S[4][x(0xA)] ^ S[5][x(0x9)] ^ S[6][x(0xB)] ^ S[7][x(0x8)] ^ S[5][z(0x3)];
K[i+4] = S[4][x(0x3)] ^ S[5][x(0x2)] ^ S[6][x(0xC)] ^ S[7][x(0xD)] ^ S[4][x(0x8)];
K[i+5] = S[4][x(0x1)] ^ S[5][x(0x0)] ^ S[6][x(0xE)] ^ S[7][x(0xF)] ^ S[5][x(0xD)];
K[i+6] = S[4][x(0x7)] ^ S[5][x(0x6)] ^ S[6][x(0x8)] ^ S[7][x(0x9)] ^ S[6][x(0x3)];
K[i+7] = S[4][x(0x5)] ^ S[5][x(0x4)] ^ S[6][x(0xA)] ^ S[7][x(0xB)] ^ S[7][x(0x7)];
Z[0] = X[0] ^ S[4][x(0xD)] ^ S[5][x(0xF)] ^ S[6][x(0xC)] ^ S[7][x(0xE)] ^ S[6][x(0x8)];
Z[1] = X[2] ^ S[4][z(0x0)] ^ S[5][z(0x2)] ^ S[6][z(0x1)] ^ S[7][z(0x3)] ^ S[7][x(0xA)];
Z[2] = X[3] ^ S[4][z(0x7)] ^ S[5][z(0x6)] ^ S[6][z(0x5)] ^ S[7][z(0x4)] ^ S[4][x(0x9)];
Z[3] = X[1] ^ S[4][z(0xA)] ^ S[5][z(0x9)] ^ S[6][z(0xB)] ^ S[7][z(0x8)] ^ S[5][x(0xB)];
K[i+8] = S[4][z(0x3)] ^ S[5][z(0x2)] ^ S[6][z(0xC)] ^ S[7][z(0xD)] ^ S[4][z(0x9)];
K[i+9] = S[4][z(0x1)] ^ S[5][z(0x0)] ^ S[6][z(0xE)] ^ S[7][z(0xF)] ^ S[5][z(0xC)];
K[i+10] = S[4][z(0x7)] ^ S[5][z(0x6)] ^ S[6][z(0x8)] ^ S[7][z(0x9)] ^ S[6][z(0x2)];
K[i+11] = S[4][z(0x5)] ^ S[5][z(0x4)] ^ S[6][z(0xA)] ^ S[7][z(0xB)] ^ S[7][z(0x6)];
X[0] = Z[2] ^ S[4][z(0x5)] ^ S[5][z(0x7)] ^ S[6][z(0x4)] ^ S[7][z(0x6)] ^ S[6][z(0x0)];
X[1] = Z[0] ^ S[4][x(0x0)] ^ S[5][x(0x2)] ^ S[6][x(0x1)] ^ S[7][x(0x3)] ^ S[7][z(0x2)];
X[2] = Z[1] ^ S[4][x(0x7)] ^ S[5][x(0x6)] ^ S[6][x(0x5)] ^ S[7][x(0x4)] ^ S[4][z(0x1)];
X[3] = Z[3] ^ S[4][x(0xA)] ^ S[5][x(0x9)] ^ S[6][x(0xB)] ^ S[7][x(0x8)] ^ S[5][z(0x3)];
K[i+12] = S[4][x(0x8)] ^ S[5][x(0x9)] ^ S[6][x(0x7)] ^ S[7][x(0x6)] ^ S[4][x(0x3)];
K[i+13] = S[4][x(0xA)] ^ S[5][x(0xB)] ^ S[6][x(0x5)] ^ S[7][x(0x4)] ^ S[5][x(0x7)];
K[i+14] = S[4][x(0xC)] ^ S[5][x(0xD)] ^ S[6][x(0x3)] ^ S[7][x(0x2)] ^ S[6][x(0x8)];
K[i+15] = S[4][x(0xE)] ^ S[5][x(0xF)] ^ S[6][x(0x1)] ^ S[7][x(0x0)] ^ S[7][x(0xD)];
}
for (i=16; i<32; i++)
K[i] &= 0x1f;
}
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