--- rsaref/source/desc.c 2018/04/24 16:37:52 1.1 +++ rsaref/source/desc.c 2018/04/24 16:38:04 1.1.1.2 @@ -1,164 +1,223 @@ /* DESC.C - Data Encryption Standard routines for RSAREF + Based on "Karn/Hoey/Outerbridge" implementation (KHODES) */ #include "global.h" #include "rsaref.h" #include "des.h" -/* Initial permutation IP. - */ -unsigned char IP[64] = { - 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, - 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, - 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, - 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 +static UINT2 BYTE_BIT[8] = { + 0200, 0100, 040, 020, 010, 04, 02, 01 }; -/* Final permutation FP = IP^{-1}. - */ -unsigned char FP[64] = { - 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, - 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, - 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, - 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25 +static UINT4 BIG_BYTE[24] = { + 0x800000L, 0x400000L, 0x200000L, 0x100000L, + 0x80000L, 0x40000L, 0x20000L, 0x10000L, + 0x8000L, 0x4000L, 0x2000L, 0x1000L, + 0x800L, 0x400L, 0x200L, 0x100L, + 0x80L, 0x40L, 0x20L, 0x10L, + 0x8L, 0x4L, 0x2L, 0x1L }; -/* Permuted-choice 1. - */ -unsigned char PC1[] = { - 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, - 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, - 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, - 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 +static unsigned char PC1[56] = { + 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, + 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, + 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, + 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 }; -/* Left shifts for the key schedule. - */ -unsigned char LS[16] = { - 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 +static unsigned char TOTAL_ROTATIONS[16] = { + 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 }; -/* Permuted-choice 2. - */ -unsigned char PC2[] = { - 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, - 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, - 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, - 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 +static unsigned char PC2[48] = { + 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, + 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, + 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, + 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 }; -/* Bit-selection table E. - */ -unsigned char E[] = { - 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, - 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, - 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, - 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1 +static UINT4 SP1[64] = { + 0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L, + 0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L, + 0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L, + 0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L, + 0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L, + 0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L, + 0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L, + 0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L, + 0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L, + 0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L, + 0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L, + 0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L, + 0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L, + 0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L, + 0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L, + 0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L }; -/* Selection functions (S-boxes). [[These are 0-origin indexed.]] - */ -unsigned char S[8][64] = { - 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, - 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, - 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, - 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13, - - 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, - 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, - 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, - 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9, - - 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, - 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, - 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, - 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12, - - 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, - 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, - 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, - 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14, - - 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, - 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, - 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, - 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3, - - 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, - 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, - 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, - 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13, - - 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, - 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, - 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, - 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12, - - 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, - 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, - 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, - 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 +static UINT4 SP2[64] = { + 0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L, + 0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L, + 0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L, + 0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L, + 0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L, + 0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L, + 0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L, + 0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L, + 0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L, + 0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L, + 0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L, + 0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L, + 0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L, + 0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L, + 0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L, + 0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L }; -/* Permutation P. - */ -unsigned char P[32] = { - 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, - 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 +static UINT4 SP3[64] = { + 0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L, + 0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L, + 0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L, + 0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L, + 0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L, + 0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L, + 0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L, + 0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L, + 0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L, + 0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L, + 0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L, + 0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L, + 0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L, + 0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L, + 0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L, + 0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L }; -static void Unpack PROTO_LIST - ((unsigned char *, unsigned char *, unsigned int)); -static void Pack PROTO_LIST - ((unsigned char *, unsigned char *, unsigned int)); +static UINT4 SP4[64] = { + 0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L, + 0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L, + 0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L, + 0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L, + 0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L, + 0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L, + 0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L, + 0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L, + 0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L, + 0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L, + 0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L, + 0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L, + 0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L, + 0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L, + 0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L, + 0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L +}; + +static UINT4 SP5[64] = { + 0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L, + 0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L, + 0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L, + 0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L, + 0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L, + 0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L, + 0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L, + 0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L, + 0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L, + 0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L, + 0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L, + 0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L, + 0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L, + 0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L, + 0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L, + 0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L +}; + +static UINT4 SP6[64] = { + 0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L, + 0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L, + 0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L, + 0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L, + 0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L, + 0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L, + 0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L, + 0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L, + 0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L, + 0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L, + 0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L, + 0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L, + 0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L, + 0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L, + 0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L, + 0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L +}; + +static UINT4 SP7[64] = { + 0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L, + 0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L, + 0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L, + 0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L, + 0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L, + 0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L, + 0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L, + 0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L, + 0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L, + 0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L, + 0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L, + 0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L, + 0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L, + 0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L, + 0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L, + 0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L +}; + +static UINT4 SP8[64] = { + 0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L, + 0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L, + 0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L, + 0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L, + 0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L, + 0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L, + 0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L, + 0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L, + 0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L, + 0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L, + 0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L, + 0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L, + 0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L, + 0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L, + 0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L, + 0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L +}; -/* DES-CBC initialization. Begins a DES-CBC operation, writing a new - context. +static void Unpack PROTO_LIST ((unsigned char *, UINT4 *)); +static void Pack PROTO_LIST ((UINT4 *, unsigned char *)); +static void DESKey PROTO_LIST ((UINT4 *, unsigned char *, int)); +static void CookKey PROTO_LIST ((UINT4 *, UINT4 *, int)); +static void DESFunction PROTO_LIST ((UINT4 *, UINT4 *)); + +/* Initialize context. Caller must zeroize the context when finished. */ void DES_CBCInit (context, key, iv, encrypt) -DES_CBC_CTX *context; /* DES-CBC context */ -unsigned char key[8]; /* DES key */ -unsigned char iv[8]; /* DES initializing vector */ +DES_CBC_CTX *context; /* context */ +unsigned char key[8]; /* key */ +unsigned char iv[8]; /* initializing vector */ int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ -{ - unsigned char CD[56], keyBit[64], t; - unsigned int i, j; - +{ /* Copy encrypt flag to context. */ context->encrypt = encrypt; - /* Unpack initializing vector into context. + /* Pack initializing vector into context. */ - Unpack (context->ivBit, iv, 8); + Pack (context->iv, iv); - /* Unpack key and generate C and D by permuting the key according to PC1. - */ - Unpack (keyBit, key, 8); - for (i = 0; i < 56; i++) - CD[i] = keyBit[PC1[i]-1]; - - /* Generate subkeys Ki by rotating C and D according to schedule and - permuting C and D according to PC2. - */ - for (i = 0; i < 16; i++) { - for (j = 0; j < LS[i]; j++) { - t = CD[0]; - R_memcpy ((POINTER)CD, (POINTER)&CD[1], 27); - CD[27] = t; - t = CD[28]; - R_memcpy ((POINTER)&CD[28], (POINTER)&CD[29], 27); - CD[55] = t; - } - - for (j = 0; j < 48; j++) - context->subkeyBit[i][j] = CD[PC2[j]-1]; - } + /* Save the IV for use in Restart */ + context->originalIV[0] = context->iv[0]; + context->originalIV[1] = context->iv[1]; - /* Zeroize sensitive information. + /* Precompute key schedule */ - R_memset ((POINTER)CD, 0, sizeof (CD)); - R_memset ((POINTER)keyBit, 0, sizeof (keyBit)); + DESKey (context->subkeys, key, encrypt); } /* DES-CBC block update operation. Continues a DES-CBC encryption @@ -166,155 +225,421 @@ int encrypt; /* encr the context. */ int DES_CBCUpdate (context, output, input, len) -DES_CBC_CTX *context; /* DES-CBC context */ +DES_CBC_CTX *context; /* context */ unsigned char *output; /* output block */ unsigned char *input; /* input block */ unsigned int len; /* length of input and output blocks */ { - unsigned char inputBit[64], LR[64], newL[32], outputBit[64], sInput[48], - sOutput[32], t; - unsigned int i, j, k; + UINT4 inputBlock[2], work[2]; + unsigned int i; if (len % 8) return (RE_LEN); - + for (i = 0; i < len/8; i++) { + Pack (inputBlock, &input[8*i]); + + /* Chain if encrypting. + */ + if (context->encrypt) { + work[0] = inputBlock[0] ^ context->iv[0]; + work[1] = inputBlock[1] ^ context->iv[1]; + } + else { + work[0] = inputBlock[0]; + work[1] = inputBlock[1]; + } - /* Unpack input block and set LR = IP(input ^ iv) (encrypt) or - LR = IP(input) (decrypt). + DESFunction (work, context->subkeys); + + /* Chain if decrypting, then update IV. */ - Unpack (inputBit, &input[8*i], 8); + if (context->encrypt) { + context->iv[0] = work[0]; + context->iv[1] = work[1]; + } + else { + work[0] ^= context->iv[0]; + work[1] ^= context->iv[1]; + context->iv[0] = inputBlock[0]; + context->iv[1] = inputBlock[1]; + } + Unpack (&output[8*i], work); + } - if (context->encrypt) - for (j = 0; j < 64; j++) - LR[j] = inputBit[IP[j]-1] ^ context->ivBit[IP[j]-1]; - else - for (j = 0; j < 64; j++) - LR[j] = inputBit[IP[j]-1]; + /* Zeroize sensitive information. + */ + R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock)); + R_memset ((POINTER)work, 0, sizeof (work)); - /* 16 rounds. + return (0); +} + +void DES_CBCRestart (context) +DES_CBC_CTX *context; +{ + /* Reset to the original IV */ + context->iv[0] = context->originalIV[0]; + context->iv[1] = context->originalIV[1]; +} + +/* Initialize context. Caller must zeroize the context when finished. + The key has the DES key, input whitener and output whitener concatenated. + */ +void DESX_CBCInit (context, key, iv, encrypt) +DESX_CBC_CTX *context; +unsigned char key[24]; /* DES key and whiteners */ +unsigned char iv[8]; /* DES initializing vector */ +int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ +{ + /* Copy encrypt flag to context. + */ + context->encrypt = encrypt; + + /* Pack initializing vector and whiteners into context. + */ + Pack (context->iv, iv); + Pack (context->inputWhitener, key + 8); + Pack (context->outputWhitener, key + 16); + + /* Save the IV for use in Restart */ + context->originalIV[0] = context->iv[0]; + context->originalIV[1] = context->iv[1]; + + /* Precompute key schedule. + */ + DESKey (context->subkeys, key, encrypt); +} + +/* DESX-CBC block update operation. Continues a DESX-CBC encryption + operation, processing eight-byte message blocks, and updating + the context. + */ +int DESX_CBCUpdate (context, output, input, len) +DESX_CBC_CTX *context; /* context */ +unsigned char *output; /* output block */ +unsigned char *input; /* input block */ +unsigned int len; /* length of input and output blocks */ +{ + UINT4 inputBlock[2], work[2]; + unsigned int i; + + if (len % 8) + return (RE_LEN); + + for (i = 0; i < len/8; i++) { + Pack (inputBlock, &input[8*i]); + + /* Chain if encrypting, and xor with whitener. */ - for (j = 0; j < 16; j++) { - - /* Save R, which will be the new L. - */ - R_memcpy ((POINTER)newL, &LR[32], 32); - - /* Compute sInput = E(R) ^ Kj (encrypt) or sInput = E(R) ^ K{15-j} - (decrypt). - */ - if (context->encrypt) - for (k = 0; k < 48; k++) - sInput[k] = LR[E[k]+31] ^ context->subkeyBit[j][k]; - else - for (k = 0; k < 48; k++) - sInput[k] = LR[E[k]+31] ^ context->subkeyBit[15-j][k]; - - /* Apply eight S boxes. Index into S box k is formed from these - bits of sInput: - - 6*k 6*k+5 6*k+1 6*k+2 6*k+3 6*k+4 - - Value of S box k becomes these bits of sOutput: - - 4*k 4*k+1 4*k+2 4*k+3 - */ - for (k = 0; k < 8; k++) { - t = S[k][(sInput[6*k] << 5) | (sInput[6*k + 5] << 4) | - (sInput[6*k + 1] << 3) | (sInput[6*k + 2] << 2) | - (sInput[6*k + 3] << 1) | (sInput[6*k + 4] << 0)]; - - sOutput[4*k] = (unsigned char)((t >> 3) & 1); - sOutput[4*k + 1] = (unsigned char)((t >> 2) & 1); - sOutput[4*k + 2] = (unsigned char)((t >> 1) & 1); - sOutput[4*k + 3] = (unsigned char)(t & 1); - } - - /* Compute new R = L ^ P(sOutput). - */ - for (k = 0; k < 32; k++) - LR[k+32] = LR[k] ^ sOutput[P[k]-1]; - - /* Restore new L. - */ - R_memcpy ((POINTER)LR, (POINTER)newL, 32); + if (context->encrypt) { + work[0] = + inputBlock[0] ^ context->iv[0] ^ context->inputWhitener[0]; + work[1] = + inputBlock[1] ^ context->iv[1] ^ context->inputWhitener[1]; + } + else { + work[0] = inputBlock[0] ^ context->outputWhitener[0]; + work[1] = inputBlock[1] ^ context->outputWhitener[1]; } - /* Exchange L and R. - */ - R_memcpy ((POINTER)newL, (POINTER)&LR[32], 32); - R_memcpy ((POINTER)&LR[32], (POINTER)LR, 32); - R_memcpy ((POINTER)LR, (POINTER)newL, 32); + DESFunction (work, context->subkeys); - /* Set output = FP(LR) (encrypt) or FP(LR) ^ iv (decrypt), and pack - output block. + /* Xor with whitener, chain if decrypting, then update IV. */ - if (context->encrypt) - for (j = 0; j < 64; j++) - outputBit[j] = LR[FP[j]-1]; - else - for (j = 0; j < 64; j++) - outputBit[j] = LR[FP[j]-1] ^ context->ivBit[j]; + if (context->encrypt) { + work[0] ^= context->outputWhitener[0]; + work[1] ^= context->outputWhitener[1]; + context->iv[0] = work[0]; + context->iv[1] = work[1]; + } + else { + work[0] ^= context->iv[0] ^ context->inputWhitener[0]; + work[1] ^= context->iv[1] ^ context->inputWhitener[1]; + context->iv[0] = inputBlock[0]; + context->iv[1] = inputBlock[1]; + } + Unpack (&output[8*i], work); + } + + /* Zeroize sensitive information. + */ + R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock)); + R_memset ((POINTER)work, 0, sizeof (work)); + + return (0); +} + +void DESX_CBCRestart (context) +DESX_CBC_CTX *context; +{ + /* Reset to the original IV */ + context->iv[0] = context->originalIV[0]; + context->iv[1] = context->originalIV[1]; +} - Pack (&output[8*i], outputBit, 8); +/* Initialize context. Caller must zeroize the context when finished. + */ +void DES3_CBCInit(context, key, iv, encrypt) +DES3_CBC_CTX *context; /* context */ +unsigned char key[24]; /* key */ +unsigned char iv[8]; /* initializing vector */ +int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ +{ + /* Copy encrypt flag to context. + */ + context->encrypt = encrypt; + + /* Pack initializing vector into context. + */ + Pack (context->iv, iv); + + /* Save the IV for use in Restart */ + context->originalIV[0] = context->iv[0]; + context->originalIV[1] = context->iv[1]; + + /* Precompute key schedules. + */ + DESKey (context->subkeys[0], encrypt ? key : &key[16], encrypt); + DESKey (context->subkeys[1], &key[8], !encrypt); + DESKey (context->subkeys[2], encrypt ? &key[16] : key, encrypt); +} + +int DES3_CBCUpdate (context, output, input, len) +DES3_CBC_CTX *context; /* context */ +unsigned char *output; /* output block */ +unsigned char *input; /* input block */ +unsigned int len; /* length of input and output blocks */ +{ + UINT4 inputBlock[2], work[2]; + unsigned int i; - /* Set iv = output (encrypt) or iv = input (decrypt). + if (len % 8) + return (RE_LEN); + + for (i = 0; i < len/8; i++) { + Pack (inputBlock, &input[8*i]); + + /* Chain if encrypting. */ - if (context->encrypt) - R_memcpy ((POINTER)context->ivBit, (POINTER)outputBit, 64); - else - R_memcpy ((POINTER)context->ivBit, (POINTER)inputBit, 64); + if (context->encrypt) { + work[0] = inputBlock[0] ^ context->iv[0]; + work[1] = inputBlock[1] ^ context->iv[1]; + } + else { + work[0] = inputBlock[0]; + work[1] = inputBlock[1]; + } + + DESFunction (work, context->subkeys[0]); + DESFunction (work, context->subkeys[1]); + DESFunction (work, context->subkeys[2]); + + /* Chain if decrypting, then update IV. + */ + if (context->encrypt) { + context->iv[0] = work[0]; + context->iv[1] = work[1]; + } + else { + work[0] ^= context->iv[0]; + work[1] ^= context->iv[1]; + context->iv[0] = inputBlock[0]; + context->iv[1] = inputBlock[1]; + } + Unpack (&output[8*i], work); } /* Zeroize sensitive information. */ - R_memset ((POINTER)inputBit, 0, sizeof (inputBit)); - R_memset ((POINTER)LR, 0, sizeof (LR)); - R_memset ((POINTER)newL, 0, sizeof (newL)); - R_memset ((POINTER)outputBit, 0, sizeof (outputBit)); - R_memset ((POINTER)sInput, 0, sizeof (sInput)); - R_memset ((POINTER)sOutput, 0, sizeof (sOutput)); - t = 0; + R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock)); + R_memset ((POINTER)work, 0, sizeof (work)); return (0); } -/* DES-CBC finalization operation. Ends a DES-CBC encryption operation, - zeroizing the context. - */ -void DES_CBCFinal (context) -DES_CBC_CTX *context; +void DES3_CBCRestart (context) +DES3_CBC_CTX *context; +{ + /* Reset to the original IV */ + context->iv[0] = context->originalIV[0]; + context->iv[1] = context->originalIV[1]; +} + +static void Pack (into, outof) +UINT4 *into; +unsigned char *outof; { - R_memset ((POINTER)context, 0, sizeof (*context)); + *into = (*outof++ & 0xffL) << 24; + *into |= (*outof++ & 0xffL) << 16; + *into |= (*outof++ & 0xffL) << 8; + *into++ |= (*outof++ & 0xffL); + *into = (*outof++ & 0xffL) << 24; + *into |= (*outof++ & 0xffL) << 16; + *into |= (*outof++ & 0xffL) << 8; + *into |= (*outof & 0xffL); } -static void Unpack (bit, block, blockLen) -unsigned char *bit; /* bit array */ -unsigned char *block; /* byte array */ -unsigned int blockLen; /* length of byte array */ +static void Unpack (into, outof) +unsigned char *into; +UINT4 *outof; { - unsigned int i, j; - unsigned char t; + *into++ = (unsigned char)((*outof >> 24) & 0xffL); + *into++ = (unsigned char)((*outof >> 16) & 0xffL); + *into++ = (unsigned char)((*outof >> 8) & 0xffL); + *into++ = (unsigned char)( *outof++ & 0xffL); + *into++ = (unsigned char)((*outof >> 24) & 0xffL); + *into++ = (unsigned char)((*outof >> 16) & 0xffL); + *into++ = (unsigned char)((*outof >> 8) & 0xffL); + *into = (unsigned char)( *outof & 0xffL); +} - for (i = 0; i < blockLen; i++) { - t = block[i]; - for (j = 0; j < 8; j++) - bit[8*i + j] = (unsigned char)((t >> (7-j)) & 1); +static void DESKey (subkeys, key, encrypt) +UINT4 subkeys[32]; +unsigned char key[8]; +int encrypt; +{ + UINT4 kn[32]; + int i, j, l, m, n; + unsigned char pc1m[56], pcr[56]; + + for (j = 0; j < 56; j++) { + l = PC1[j]; + m = l & 07; + pc1m[j] = (unsigned char)((key[l >> 3] & BYTE_BIT[m]) ? 1 : 0); } + for (i = 0; i < 16; i++) { + m = i << 1; + n = m + 1; + kn[m] = kn[n] = 0L; + for (j = 0; j < 28; j++) { + l = j + TOTAL_ROTATIONS[i]; + if (l < 28) + pcr[j] = pc1m[l]; + else + pcr[j] = pc1m[l - 28]; + } + for (j = 28; j < 56; j++) { + l = j + TOTAL_ROTATIONS[i]; + if (l < 56) + pcr[j] = pc1m[l]; + else + pcr[j] = pc1m[l - 28]; + } + for (j = 0; j < 24; j++) { + if (pcr[PC2[j]]) + kn[m] |= BIG_BYTE[j]; + if (pcr[PC2[j+24]]) + kn[n] |= BIG_BYTE[j]; + } + } + CookKey (subkeys, kn, encrypt); + + /* Zeroize sensitive information. + */ + R_memset ((POINTER)pc1m, 0, sizeof (pc1m)); + R_memset ((POINTER)pcr, 0, sizeof (pcr)); + R_memset ((POINTER)kn, 0, sizeof (kn)); } -static void Pack (block, bit, blockLen) -unsigned char *block; /* byte array */ -unsigned char *bit; /* bit array */ -unsigned int blockLen; /* length of byte array */ -{ - unsigned int i, j; - unsigned char t; - - for (i = 0; i < blockLen; i++) { - t = 0; - for (j = 0; j < 8; j++) - t |= bit[8*i +j] << (7-j); - block[i] = t; +static void CookKey (subkeys, kn, encrypt) +UINT4 *subkeys; +UINT4 *kn; +int encrypt; +{ + UINT4 *cooked, *raw0, *raw1; + int increment; + unsigned int i; + + raw1 = kn; + cooked = encrypt ? subkeys : &subkeys[30]; + increment = encrypt ? 1 : -3; + + for (i = 0; i < 16; i++, raw1++) { + raw0 = raw1++; + *cooked = (*raw0 & 0x00fc0000L) << 6; + *cooked |= (*raw0 & 0x00000fc0L) << 10; + *cooked |= (*raw1 & 0x00fc0000L) >> 10; + *cooked++ |= (*raw1 & 0x00000fc0L) >> 6; + *cooked = (*raw0 & 0x0003f000L) << 12; + *cooked |= (*raw0 & 0x0000003fL) << 16; + *cooked |= (*raw1 & 0x0003f000L) >> 4; + *cooked |= (*raw1 & 0x0000003fL); + cooked += increment; + } +} + +static void DESFunction (block, subkeys) +UINT4 *block; +UINT4 *subkeys; +{ + register UINT4 fval, work, right, left; + register int round; + + left = block[0]; + right = block[1]; + work = ((left >> 4) ^ right) & 0x0f0f0f0fL; + right ^= work; + left ^= (work << 4); + work = ((left >> 16) ^ right) & 0x0000ffffL; + right ^= work; + left ^= (work << 16); + work = ((right >> 2) ^ left) & 0x33333333L; + left ^= work; + right ^= (work << 2); + work = ((right >> 8) ^ left) & 0x00ff00ffL; + left ^= work; + right ^= (work << 8); + right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL; + work = (left ^ right) & 0xaaaaaaaaL; + left ^= work; + right ^= work; + left = ((left << 1) | ((left >> 31) & 1L)) & 0xffffffffL; + + for (round = 0; round < 8; round++) { + work = (right << 28) | (right >> 4); + work ^= *subkeys++; + fval = SP7[ work & 0x3fL]; + fval |= SP5[(work >> 8) & 0x3fL]; + fval |= SP3[(work >> 16) & 0x3fL]; + fval |= SP1[(work >> 24) & 0x3fL]; + work = right ^ *subkeys++; + fval |= SP8[ work & 0x3fL]; + fval |= SP6[(work >> 8) & 0x3fL]; + fval |= SP4[(work >> 16) & 0x3fL]; + fval |= SP2[(work >> 24) & 0x3fL]; + left ^= fval; + work = (left << 28) | (left >> 4); + work ^= *subkeys++; + fval = SP7[ work & 0x3fL]; + fval |= SP5[(work >> 8) & 0x3fL]; + fval |= SP3[(work >> 16) & 0x3fL]; + fval |= SP1[(work >> 24) & 0x3fL]; + work = left ^ *subkeys++; + fval |= SP8[ work & 0x3fL]; + fval |= SP6[(work >> 8) & 0x3fL]; + fval |= SP4[(work >> 16) & 0x3fL]; + fval |= SP2[(work >> 24) & 0x3fL]; + right ^= fval; } + + right = (right << 31) | (right >> 1); + work = (left ^ right) & 0xaaaaaaaaL; + left ^= work; + right ^= work; + left = (left << 31) | (left >> 1); + work = ((left >> 8) ^ right) & 0x00ff00ffL; + right ^= work; + left ^= (work << 8); + work = ((left >> 2) ^ right) & 0x33333333L; + right ^= work; + left ^= (work << 2); + work = ((right >> 16) ^ left) & 0x0000ffffL; + left ^= work; + right ^= (work << 16); + work = ((right >> 4) ^ left) & 0x0f0f0f0fL; + left ^= work; + right ^= (work << 4); + *block++ = right; + *block = left; }