diff options
Diffstat (limited to 'secure/usr.sbin/xntpd/lib/authdes.c')
| -rw-r--r-- | secure/usr.sbin/xntpd/lib/authdes.c | 869 |
1 files changed, 869 insertions, 0 deletions
diff --git a/secure/usr.sbin/xntpd/lib/authdes.c b/secure/usr.sbin/xntpd/lib/authdes.c new file mode 100644 index 0000000..d6d8d1b --- /dev/null +++ b/secure/usr.sbin/xntpd/lib/authdes.c @@ -0,0 +1,869 @@ +/* + * authdes.c - an implementation of the DES cipher algorithm for NTP + */ +#include <sys/types.h> + +#include <netinet/in.h> + +#if BYTE_ORDER == BIG_ENDIAN +#define XNTP_BIG_ENDIAN +#endif +#if BYTE_ORDER == LITTLE_ENDIAN +#define XNTP_LITTLE_ENDIAN +#endif + +/* + * There are two entries in here. auth_subkeys() called to + * compute the encryption and decryption key schedules, while + * auth_des() is called to do the actual encryption/decryption + */ + +/* + * Byte order woes. The DES code is sensitive to byte order. This + * used to be resolved by calling ntohl() and htonl() to swap things + * around, but this turned out to be quite costly on Vaxes where those + * things are actual functions. The code now straightens out byte + * order troubles on its own, with no performance penalty for little + * end first machines, but at great expense to cleanliness. + */ +#if !defined(XNTP_BIG_ENDIAN) && !defined(XNTP_LITTLE_ENDIAN) + /* + * Pick one or the other. + */ + BYTE_ORDER_NOT_DEFINED_FOR_AUTHENTICATION +#endif + +/* + * Key setup. Here we entirely permute a key, saving the results + * for both the encryption and decryption. Note that while the + * decryption subkeys are simply the encryption keys reordered, + * we save both so that a common cipher routine may be used. + */ + +/* + * Permuted choice 1 tables. These are used to extract bits + * from the left and right parts of the key to form Ci and Di. + * The code that uses these tables knows which bits from which + * part of each key are used to form Ci and Di. + */ +static u_long PC1_CL[8] = { + 0x00000000, 0x00000010, 0x00001000, 0x00001010, + 0x00100000, 0x00100010, 0x00101000, 0x00101010 +}; + +static u_long PC1_DL[16] = { + 0x00000000, 0x00100000, 0x00001000, 0x00101000, + 0x00000010, 0x00100010, 0x00001010, 0x00101010, + 0x00000001, 0x00100001, 0x00001001, 0x00101001, + 0x00000011, 0x00100011, 0x00001011, 0x00101011 +}; + +static u_long PC1_CR[16] = { + 0x00000000, 0x00000001, 0x00000100, 0x00000101, + 0x00010000, 0x00010001, 0x00010100, 0x00010101, + 0x01000000, 0x01000001, 0x01000100, 0x01000101, + 0x01010000, 0x01010001, 0x01010100, 0x01010101 +}; + +static u_long PC1_DR[8] = { + 0x00000000, 0x01000000, 0x00010000, 0x01010000, + 0x00000100, 0x01000100, 0x00010100, 0x01010100 +}; + + +/* + * At the start of some iterations of the key schedule we do + * a circular left shift by one place, while for others we do a shift by + * two places. This has bits set for the iterations where we do 2 bit + * shifts, starting at the low order bit. + */ +#define TWO_BIT_SHIFTS 0x7efc + +/* + * Permuted choice 2 tables. The first actually produces the low order + * 24 bits of the subkey Ki from the 28 bit value of Ci. The second produces + * the high order 24 bits from Di. The tables are indexed by six bit + * segments of Ci and Di respectively. The code is handcrafted to compute + * the appropriate 6 bit chunks. + * + * Note that for ease of computation, the 24 bit values are produced with + * six bits going into each byte. + */ +static u_long PC2_C[4][64] = { + 0x00000000, 0x00040000, 0x01000000, 0x01040000, + 0x00000400, 0x00040400, 0x01000400, 0x01040400, + 0x00200000, 0x00240000, 0x01200000, 0x01240000, + 0x00200400, 0x00240400, 0x01200400, 0x01240400, + 0x00000001, 0x00040001, 0x01000001, 0x01040001, + 0x00000401, 0x00040401, 0x01000401, 0x01040401, + 0x00200001, 0x00240001, 0x01200001, 0x01240001, + 0x00200401, 0x00240401, 0x01200401, 0x01240401, + 0x02000000, 0x02040000, 0x03000000, 0x03040000, + 0x02000400, 0x02040400, 0x03000400, 0x03040400, + 0x02200000, 0x02240000, 0x03200000, 0x03240000, + 0x02200400, 0x02240400, 0x03200400, 0x03240400, + 0x02000001, 0x02040001, 0x03000001, 0x03040001, + 0x02000401, 0x02040401, 0x03000401, 0x03040401, + 0x02200001, 0x02240001, 0x03200001, 0x03240001, + 0x02200401, 0x02240401, 0x03200401, 0x03240401, + + 0x00000000, 0x00000002, 0x00000800, 0x00000802, + 0x08000000, 0x08000002, 0x08000800, 0x08000802, + 0x00010000, 0x00010002, 0x00010800, 0x00010802, + 0x08010000, 0x08010002, 0x08010800, 0x08010802, + 0x00000100, 0x00000102, 0x00000900, 0x00000902, + 0x08000100, 0x08000102, 0x08000900, 0x08000902, + 0x00010100, 0x00010102, 0x00010900, 0x00010902, + 0x08010100, 0x08010102, 0x08010900, 0x08010902, + 0x00000010, 0x00000012, 0x00000810, 0x00000812, + 0x08000010, 0x08000012, 0x08000810, 0x08000812, + 0x00010010, 0x00010012, 0x00010810, 0x00010812, + 0x08010010, 0x08010012, 0x08010810, 0x08010812, + 0x00000110, 0x00000112, 0x00000910, 0x00000912, + 0x08000110, 0x08000112, 0x08000910, 0x08000912, + 0x00010110, 0x00010112, 0x00010910, 0x00010912, + 0x08010110, 0x08010112, 0x08010910, 0x08010912, + + 0x00000000, 0x04000000, 0x00002000, 0x04002000, + 0x10000000, 0x14000000, 0x10002000, 0x14002000, + 0x00000020, 0x04000020, 0x00002020, 0x04002020, + 0x10000020, 0x14000020, 0x10002020, 0x14002020, + 0x00080000, 0x04080000, 0x00082000, 0x04082000, + 0x10080000, 0x14080000, 0x10082000, 0x14082000, + 0x00080020, 0x04080020, 0x00082020, 0x04082020, + 0x10080020, 0x14080020, 0x10082020, 0x14082020, + 0x20000000, 0x24000000, 0x20002000, 0x24002000, + 0x30000000, 0x34000000, 0x30002000, 0x34002000, + 0x20000020, 0x24000020, 0x20002020, 0x24002020, + 0x30000020, 0x34000020, 0x30002020, 0x34002020, + 0x20080000, 0x24080000, 0x20082000, 0x24082000, + 0x30080000, 0x34080000, 0x30082000, 0x34082000, + 0x20080020, 0x24080020, 0x20082020, 0x24082020, + 0x30080020, 0x34080020, 0x30082020, 0x34082020, + + 0x00000000, 0x00100000, 0x00000008, 0x00100008, + 0x00000200, 0x00100200, 0x00000208, 0x00100208, + 0x00020000, 0x00120000, 0x00020008, 0x00120008, + 0x00020200, 0x00120200, 0x00020208, 0x00120208, + 0x00000004, 0x00100004, 0x0000000c, 0x0010000c, + 0x00000204, 0x00100204, 0x0000020c, 0x0010020c, + 0x00020004, 0x00120004, 0x0002000c, 0x0012000c, + 0x00020204, 0x00120204, 0x0002020c, 0x0012020c, + 0x00001000, 0x00101000, 0x00001008, 0x00101008, + 0x00001200, 0x00101200, 0x00001208, 0x00101208, + 0x00021000, 0x00121000, 0x00021008, 0x00121008, + 0x00021200, 0x00121200, 0x00021208, 0x00121208, + 0x00001004, 0x00101004, 0x0000100c, 0x0010100c, + 0x00001204, 0x00101204, 0x0000120c, 0x0010120c, + 0x00021004, 0x00121004, 0x0002100c, 0x0012100c, + 0x00021204, 0x00121204, 0x0002120c, 0x0012120c +}; + +static u_long PC2_D[4][64] = { + 0x00000000, 0x00000200, 0x00020000, 0x00020200, + 0x00000001, 0x00000201, 0x00020001, 0x00020201, + 0x08000000, 0x08000200, 0x08020000, 0x08020200, + 0x08000001, 0x08000201, 0x08020001, 0x08020201, + 0x00200000, 0x00200200, 0x00220000, 0x00220200, + 0x00200001, 0x00200201, 0x00220001, 0x00220201, + 0x08200000, 0x08200200, 0x08220000, 0x08220200, + 0x08200001, 0x08200201, 0x08220001, 0x08220201, + 0x00000002, 0x00000202, 0x00020002, 0x00020202, + 0x00000003, 0x00000203, 0x00020003, 0x00020203, + 0x08000002, 0x08000202, 0x08020002, 0x08020202, + 0x08000003, 0x08000203, 0x08020003, 0x08020203, + 0x00200002, 0x00200202, 0x00220002, 0x00220202, + 0x00200003, 0x00200203, 0x00220003, 0x00220203, + 0x08200002, 0x08200202, 0x08220002, 0x08220202, + 0x08200003, 0x08200203, 0x08220003, 0x08220203, + + 0x00000000, 0x00000010, 0x20000000, 0x20000010, + 0x00100000, 0x00100010, 0x20100000, 0x20100010, + 0x00000800, 0x00000810, 0x20000800, 0x20000810, + 0x00100800, 0x00100810, 0x20100800, 0x20100810, + 0x04000000, 0x04000010, 0x24000000, 0x24000010, + 0x04100000, 0x04100010, 0x24100000, 0x24100010, + 0x04000800, 0x04000810, 0x24000800, 0x24000810, + 0x04100800, 0x04100810, 0x24100800, 0x24100810, + 0x00000004, 0x00000014, 0x20000004, 0x20000014, + 0x00100004, 0x00100014, 0x20100004, 0x20100014, + 0x00000804, 0x00000814, 0x20000804, 0x20000814, + 0x00100804, 0x00100814, 0x20100804, 0x20100814, + 0x04000004, 0x04000014, 0x24000004, 0x24000014, + 0x04100004, 0x04100014, 0x24100004, 0x24100014, + 0x04000804, 0x04000814, 0x24000804, 0x24000814, + 0x04100804, 0x04100814, 0x24100804, 0x24100814, + + 0x00000000, 0x00001000, 0x00010000, 0x00011000, + 0x02000000, 0x02001000, 0x02010000, 0x02011000, + 0x00000020, 0x00001020, 0x00010020, 0x00011020, + 0x02000020, 0x02001020, 0x02010020, 0x02011020, + 0x00040000, 0x00041000, 0x00050000, 0x00051000, + 0x02040000, 0x02041000, 0x02050000, 0x02051000, + 0x00040020, 0x00041020, 0x00050020, 0x00051020, + 0x02040020, 0x02041020, 0x02050020, 0x02051020, + 0x00002000, 0x00003000, 0x00012000, 0x00013000, + 0x02002000, 0x02003000, 0x02012000, 0x02013000, + 0x00002020, 0x00003020, 0x00012020, 0x00013020, + 0x02002020, 0x02003020, 0x02012020, 0x02013020, + 0x00042000, 0x00043000, 0x00052000, 0x00053000, + 0x02042000, 0x02043000, 0x02052000, 0x02053000, + 0x00042020, 0x00043020, 0x00052020, 0x00053020, + 0x02042020, 0x02043020, 0x02052020, 0x02053020, + + 0x00000000, 0x00000400, 0x01000000, 0x01000400, + 0x00000100, 0x00000500, 0x01000100, 0x01000500, + 0x10000000, 0x10000400, 0x11000000, 0x11000400, + 0x10000100, 0x10000500, 0x11000100, 0x11000500, + 0x00080000, 0x00080400, 0x01080000, 0x01080400, + 0x00080100, 0x00080500, 0x01080100, 0x01080500, + 0x10080000, 0x10080400, 0x11080000, 0x11080400, + 0x10080100, 0x10080500, 0x11080100, 0x11080500, + 0x00000008, 0x00000408, 0x01000008, 0x01000408, + 0x00000108, 0x00000508, 0x01000108, 0x01000508, + 0x10000008, 0x10000408, 0x11000008, 0x11000408, + 0x10000108, 0x10000508, 0x11000108, 0x11000508, + 0x00080008, 0x00080408, 0x01080008, 0x01080408, + 0x00080108, 0x00080508, 0x01080108, 0x01080508, + 0x10080008, 0x10080408, 0x11080008, 0x11080408, + 0x10080108, 0x10080508, 0x11080108, 0x11080508 +}; + + + +/* + * Permute the key to give us our key schedule. + */ +void +DESauth_subkeys(key, encryptkeys, decryptkeys) + u_long *key; + u_char *encryptkeys; + u_char *decryptkeys; +{ + register u_long tmp; + register u_long c, d; + register u_char *ek, *dk; + register int two_bit_shifts; + register int i; + + /* + * The first permutted choice gives us the 28 bits for C0 and + * 28 for D0. C0 gets 12 bits from the left key and 16 from + * the right, while D0 gets 16 from the left and 12 from the + * right. The code knows which bits go where. + */ + tmp = *key; /* left part of key */ + c = PC1_CL[(tmp >> 29) & 0x7] + | (PC1_CL[(tmp >> 21) & 0x7] << 1) + | (PC1_CL[(tmp >> 13) & 0x7] << 2) + | (PC1_CL[(tmp >> 5) & 0x7] << 3); + d = PC1_DL[(tmp >> 25) & 0xf] + | (PC1_DL[(tmp >> 17) & 0xf] << 1) + | (PC1_DL[(tmp >> 9) & 0xf] << 2) + | (PC1_DL[(tmp >> 1) & 0xf] << 3); + + tmp = *(key+1); /* right part of key */ + c |= PC1_CR[(tmp >> 28) & 0xf] + | (PC1_CR[(tmp >> 20) & 0xf] << 1) + | (PC1_CR[(tmp >> 12) & 0xf] << 2) + | (PC1_CR[(tmp >> 4) & 0xf] << 3); + d |= PC1_DR[(tmp >> 25) & 0x7] + | (PC1_DR[(tmp >> 17) & 0x7] << 1) + | (PC1_DR[(tmp >> 9) & 0x7] << 2) + | (PC1_DR[(tmp >> 1) & 0x7] << 3); + + /* + * Now iterate to compute the key schedule. Note that we + * record the entire set of subkeys in 6 bit chunks since + * they are used that way. At 6 bits/char, we need + * 48/6 char's/subkey * 16 subkeys/encryption == 128 chars. + * encryptkeys and decryptkeys must be this big. + */ + ek = encryptkeys; + dk = decryptkeys + (8 * 15); + two_bit_shifts = TWO_BIT_SHIFTS; + for (i = 16; i > 0; i--) { + /* + * Do the rotation. One bit and two bit rotations + * are done separately. Note C and D are 28 bits. + */ + if (two_bit_shifts & 0x1) { + c = ((c << 2) & 0xffffffc) | (c >> 26); + d = ((d << 2) & 0xffffffc) | (d >> 26); + } else { + c = ((c << 1) & 0xffffffe) | (c >> 27); + d = ((d << 1) & 0xffffffe) | (d >> 27); + } + two_bit_shifts >>= 1; + + /* + * Apply permutted choice 2 to C to get the first + * 24 bits worth of keys. Note that bits 9, 18, 22 + * and 25 (using DES numbering) in C are unused. The + * shift-mask stuff is done to delete these bits from + * the indices, since this cuts the table size in half. + */ + tmp = PC2_C[0][((c >> 22) & 0x3f)] + | PC2_C[1][((c >> 15) & 0xf) | ((c >> 16) & 0x30)] + | PC2_C[2][((c >> 4) & 0x3) | ((c >> 9) & 0x3c)] + | PC2_C[3][((c ) & 0x7) | ((c >> 4) & 0x38)]; + *ek++ = *dk++ = (u_char)(tmp >> 24); + *ek++ = *dk++ = (u_char)(tmp >> 16); + *ek++ = *dk++ = (u_char)(tmp >> 8); + *ek++ = *dk++ = (u_char)tmp; + + /* + * Apply permutted choice 2 to D to get the other half. + * Here, bits 7, 10, 15 and 26 go unused. The sqeezing + * actually turns out to be cheaper here. + */ + tmp = PC2_D[0][((d >> 22) & 0x3f)] + | PC2_D[1][((d >> 14) & 0xf) | ((d >> 15) & 0x30)] + | PC2_D[2][((d >> 7) & 0x3f)] + | PC2_D[3][((d ) & 0x3) | ((d >> 1) & 0x3c)]; + *ek++ = *dk++ = (u_char)(tmp >> 24); + *ek++ = *dk++ = (u_char)(tmp >> 16); + *ek++ = *dk++ = (u_char)(tmp >> 8); + *ek++ = *dk++ = (u_char)tmp; + + /* + * We are filling in the decryption subkeys from the end. + * Space it back 16 elements to get to the start of the + * next set. + */ + dk -= 16; + } +} + +/* + * The DES algorithm. This is intended to be fairly speedy at the + * expense of some memory. + * + * This uses all the standard hacks. The S boxes and the P permutation + * are precomputed into one table. The E box never actually appears + * explicitly since it is easy to apply this algorithmically. The + * initial permutation and final (inverse initial) permuation are + * computed from tables designed to permute four bits at a time. This + * should run pretty fast on machines with 32 bit words and + * bit field/multiple bit shift instructions which are fast. + */ + +/* + * The initial permutation array. This is used to compute both the + * left and the right halves of the initial permutation using bytes + * from words made from the following operations: + * + * ((left & 0x55555555) << 1) | (right & 0x55555555) for left half + * (left & 0xaaaaaaaa) | ((right & 0xaaaaaaaa) >> 1) for right half + * + * The scheme is that we index into the table using each byte. The + * result from the high order byte is or'd with the result from the + * next byte shifted left once is or'd with the result from the next + * byte shifted left twice if or'd with the result from the low order + * byte shifted left by three. Clear? + */ +static u_long IP[256] = { + 0x00000000, 0x00000010, 0x00000001, 0x00000011, + 0x00001000, 0x00001010, 0x00001001, 0x00001011, + 0x00000100, 0x00000110, 0x00000101, 0x00000111, + 0x00001100, 0x00001110, 0x00001101, 0x00001111, + 0x00100000, 0x00100010, 0x00100001, 0x00100011, + 0x00101000, 0x00101010, 0x00101001, 0x00101011, + 0x00100100, 0x00100110, 0x00100101, 0x00100111, + 0x00101100, 0x00101110, 0x00101101, 0x00101111, + 0x00010000, 0x00010010, 0x00010001, 0x00010011, + 0x00011000, 0x00011010, 0x00011001, 0x00011011, + 0x00010100, 0x00010110, 0x00010101, 0x00010111, + 0x00011100, 0x00011110, 0x00011101, 0x00011111, + 0x00110000, 0x00110010, 0x00110001, 0x00110011, + 0x00111000, 0x00111010, 0x00111001, 0x00111011, + 0x00110100, 0x00110110, 0x00110101, 0x00110111, + 0x00111100, 0x00111110, 0x00111101, 0x00111111, + 0x10000000, 0x10000010, 0x10000001, 0x10000011, + 0x10001000, 0x10001010, 0x10001001, 0x10001011, + 0x10000100, 0x10000110, 0x10000101, 0x10000111, + 0x10001100, 0x10001110, 0x10001101, 0x10001111, + 0x10100000, 0x10100010, 0x10100001, 0x10100011, + 0x10101000, 0x10101010, 0x10101001, 0x10101011, + 0x10100100, 0x10100110, 0x10100101, 0x10100111, + 0x10101100, 0x10101110, 0x10101101, 0x10101111, + 0x10010000, 0x10010010, 0x10010001, 0x10010011, + 0x10011000, 0x10011010, 0x10011001, 0x10011011, + 0x10010100, 0x10010110, 0x10010101, 0x10010111, + 0x10011100, 0x10011110, 0x10011101, 0x10011111, + 0x10110000, 0x10110010, 0x10110001, 0x10110011, + 0x10111000, 0x10111010, 0x10111001, 0x10111011, + 0x10110100, 0x10110110, 0x10110101, 0x10110111, + 0x10111100, 0x10111110, 0x10111101, 0x10111111, + 0x01000000, 0x01000010, 0x01000001, 0x01000011, + 0x01001000, 0x01001010, 0x01001001, 0x01001011, + 0x01000100, 0x01000110, 0x01000101, 0x01000111, + 0x01001100, 0x01001110, 0x01001101, 0x01001111, + 0x01100000, 0x01100010, 0x01100001, 0x01100011, + 0x01101000, 0x01101010, 0x01101001, 0x01101011, + 0x01100100, 0x01100110, 0x01100101, 0x01100111, + 0x01101100, 0x01101110, 0x01101101, 0x01101111, + 0x01010000, 0x01010010, 0x01010001, 0x01010011, + 0x01011000, 0x01011010, 0x01011001, 0x01011011, + 0x01010100, 0x01010110, 0x01010101, 0x01010111, + 0x01011100, 0x01011110, 0x01011101, 0x01011111, + 0x01110000, 0x01110010, 0x01110001, 0x01110011, + 0x01111000, 0x01111010, 0x01111001, 0x01111011, + 0x01110100, 0x01110110, 0x01110101, 0x01110111, + 0x01111100, 0x01111110, 0x01111101, 0x01111111, + 0x11000000, 0x11000010, 0x11000001, 0x11000011, + 0x11001000, 0x11001010, 0x11001001, 0x11001011, + 0x11000100, 0x11000110, 0x11000101, 0x11000111, + 0x11001100, 0x11001110, 0x11001101, 0x11001111, + 0x11100000, 0x11100010, 0x11100001, 0x11100011, + 0x11101000, 0x11101010, 0x11101001, 0x11101011, + 0x11100100, 0x11100110, 0x11100101, 0x11100111, + 0x11101100, 0x11101110, 0x11101101, 0x11101111, + 0x11010000, 0x11010010, 0x11010001, 0x11010011, + 0x11011000, 0x11011010, 0x11011001, 0x11011011, + 0x11010100, 0x11010110, 0x11010101, 0x11010111, + 0x11011100, 0x11011110, 0x11011101, 0x11011111, + 0x11110000, 0x11110010, 0x11110001, 0x11110011, + 0x11111000, 0x11111010, 0x11111001, 0x11111011, + 0x11110100, 0x11110110, 0x11110101, 0x11110111, + 0x11111100, 0x11111110, 0x11111101, 0x11111111 +}; + +/* + * The final permutation array. Like the IP array, used + * to compute both the left and right results from the nibbles + * of words computed from: + * + * ((left & 0x0f0f0f0f) << 4) | (right & 0x0f0f0f0f) for left result + * (left & 0xf0f0f0f0) | ((right & 0xf0f0f0f0) >> 4) for right result + * + * The result from the high order byte is shifted left 6 bits and + * or'd with the result from the next byte shifted left 4 bits, which + * is or'd with the result from the next byte shifted left 2 bits, + * which is or'd with the result from the low byte. + * + * There is one of these for big end machines (the natural order for + * DES) and a second for little end machines. One is a byte swapped + * version of the other. + */ +#ifndef XNTP_LITTLE_ENDIAN + /* + * Big end version + */ +static u_long FP[256] = { + 0x00000000, 0x02000000, 0x00020000, 0x02020000, + 0x00000200, 0x02000200, 0x00020200, 0x02020200, + 0x00000002, 0x02000002, 0x00020002, 0x02020002, + 0x00000202, 0x02000202, 0x00020202, 0x02020202, + 0x01000000, 0x03000000, 0x01020000, 0x03020000, + 0x01000200, 0x03000200, 0x01020200, 0x03020200, + 0x01000002, 0x03000002, 0x01020002, 0x03020002, + 0x01000202, 0x03000202, 0x01020202, 0x03020202, + 0x00010000, 0x02010000, 0x00030000, 0x02030000, + 0x00010200, 0x02010200, 0x00030200, 0x02030200, + 0x00010002, 0x02010002, 0x00030002, 0x02030002, + 0x00010202, 0x02010202, 0x00030202, 0x02030202, + 0x01010000, 0x03010000, 0x01030000, 0x03030000, + 0x01010200, 0x03010200, 0x01030200, 0x03030200, + 0x01010002, 0x03010002, 0x01030002, 0x03030002, + 0x01010202, 0x03010202, 0x01030202, 0x03030202, + 0x00000100, 0x02000100, 0x00020100, 0x02020100, + 0x00000300, 0x02000300, 0x00020300, 0x02020300, + 0x00000102, 0x02000102, 0x00020102, 0x02020102, + 0x00000302, 0x02000302, 0x00020302, 0x02020302, + 0x01000100, 0x03000100, 0x01020100, 0x03020100, + 0x01000300, 0x03000300, 0x01020300, 0x03020300, + 0x01000102, 0x03000102, 0x01020102, 0x03020102, + 0x01000302, 0x03000302, 0x01020302, 0x03020302, + 0x00010100, 0x02010100, 0x00030100, 0x02030100, + 0x00010300, 0x02010300, 0x00030300, 0x02030300, + 0x00010102, 0x02010102, 0x00030102, 0x02030102, + 0x00010302, 0x02010302, 0x00030302, 0x02030302, + 0x01010100, 0x03010100, 0x01030100, 0x03030100, + 0x01010300, 0x03010300, 0x01030300, 0x03030300, + 0x01010102, 0x03010102, 0x01030102, 0x03030102, + 0x01010302, 0x03010302, 0x01030302, 0x03030302, + 0x00000001, 0x02000001, 0x00020001, 0x02020001, + 0x00000201, 0x02000201, 0x00020201, 0x02020201, + 0x00000003, 0x02000003, 0x00020003, 0x02020003, + 0x00000203, 0x02000203, 0x00020203, 0x02020203, + 0x01000001, 0x03000001, 0x01020001, 0x03020001, + 0x01000201, 0x03000201, 0x01020201, 0x03020201, + 0x01000003, 0x03000003, 0x01020003, 0x03020003, + 0x01000203, 0x03000203, 0x01020203, 0x03020203, + 0x00010001, 0x02010001, 0x00030001, 0x02030001, + 0x00010201, 0x02010201, 0x00030201, 0x02030201, + 0x00010003, 0x02010003, 0x00030003, 0x02030003, + 0x00010203, 0x02010203, 0x00030203, 0x02030203, + 0x01010001, 0x03010001, 0x01030001, 0x03030001, + 0x01010201, 0x03010201, 0x01030201, 0x03030201, + 0x01010003, 0x03010003, 0x01030003, 0x03030003, + 0x01010203, 0x03010203, 0x01030203, 0x03030203, + 0x00000101, 0x02000101, 0x00020101, 0x02020101, + 0x00000301, 0x02000301, 0x00020301, 0x02020301, + 0x00000103, 0x02000103, 0x00020103, 0x02020103, + 0x00000303, 0x02000303, 0x00020303, 0x02020303, + 0x01000101, 0x03000101, 0x01020101, 0x03020101, + 0x01000301, 0x03000301, 0x01020301, 0x03020301, + 0x01000103, 0x03000103, 0x01020103, 0x03020103, + 0x01000303, 0x03000303, 0x01020303, 0x03020303, + 0x00010101, 0x02010101, 0x00030101, 0x02030101, + 0x00010301, 0x02010301, 0x00030301, 0x02030301, + 0x00010103, 0x02010103, 0x00030103, 0x02030103, + 0x00010303, 0x02010303, 0x00030303, 0x02030303, + 0x01010101, 0x03010101, 0x01030101, 0x03030101, + 0x01010301, 0x03010301, 0x01030301, 0x03030301, + 0x01010103, 0x03010103, 0x01030103, 0x03030103, + 0x01010303, 0x03010303, 0x01030303, 0x03030303 +}; +#else + /* + * Byte swapped for little end machines. + */ +static u_long FP[256] = { + 0x00000000, 0x00000002, 0x00000200, 0x00000202, + 0x00020000, 0x00020002, 0x00020200, 0x00020202, + 0x02000000, 0x02000002, 0x02000200, 0x02000202, + 0x02020000, 0x02020002, 0x02020200, 0x02020202, + 0x00000001, 0x00000003, 0x00000201, 0x00000203, + 0x00020001, 0x00020003, 0x00020201, 0x00020203, + 0x02000001, 0x02000003, 0x02000201, 0x02000203, + 0x02020001, 0x02020003, 0x02020201, 0x02020203, + 0x00000100, 0x00000102, 0x00000300, 0x00000302, + 0x00020100, 0x00020102, 0x00020300, 0x00020302, + 0x02000100, 0x02000102, 0x02000300, 0x02000302, + 0x02020100, 0x02020102, 0x02020300, 0x02020302, + 0x00000101, 0x00000103, 0x00000301, 0x00000303, + 0x00020101, 0x00020103, 0x00020301, 0x00020303, + 0x02000101, 0x02000103, 0x02000301, 0x02000303, + 0x02020101, 0x02020103, 0x02020301, 0x02020303, + 0x00010000, 0x00010002, 0x00010200, 0x00010202, + 0x00030000, 0x00030002, 0x00030200, 0x00030202, + 0x02010000, 0x02010002, 0x02010200, 0x02010202, + 0x02030000, 0x02030002, 0x02030200, 0x02030202, + 0x00010001, 0x00010003, 0x00010201, 0x00010203, + 0x00030001, 0x00030003, 0x00030201, 0x00030203, + 0x02010001, 0x02010003, 0x02010201, 0x02010203, + 0x02030001, 0x02030003, 0x02030201, 0x02030203, + 0x00010100, 0x00010102, 0x00010300, 0x00010302, + 0x00030100, 0x00030102, 0x00030300, 0x00030302, + 0x02010100, 0x02010102, 0x02010300, 0x02010302, + 0x02030100, 0x02030102, 0x02030300, 0x02030302, + 0x00010101, 0x00010103, 0x00010301, 0x00010303, + 0x00030101, 0x00030103, 0x00030301, 0x00030303, + 0x02010101, 0x02010103, 0x02010301, 0x02010303, + 0x02030101, 0x02030103, 0x02030301, 0x02030303, + 0x01000000, 0x01000002, 0x01000200, 0x01000202, + 0x01020000, 0x01020002, 0x01020200, 0x01020202, + 0x03000000, 0x03000002, 0x03000200, 0x03000202, + 0x03020000, 0x03020002, 0x03020200, 0x03020202, + 0x01000001, 0x01000003, 0x01000201, 0x01000203, + 0x01020001, 0x01020003, 0x01020201, 0x01020203, + 0x03000001, 0x03000003, 0x03000201, 0x03000203, + 0x03020001, 0x03020003, 0x03020201, 0x03020203, + 0x01000100, 0x01000102, 0x01000300, 0x01000302, + 0x01020100, 0x01020102, 0x01020300, 0x01020302, + 0x03000100, 0x03000102, 0x03000300, 0x03000302, + 0x03020100, 0x03020102, 0x03020300, 0x03020302, + 0x01000101, 0x01000103, 0x01000301, 0x01000303, + 0x01020101, 0x01020103, 0x01020301, 0x01020303, + 0x03000101, 0x03000103, 0x03000301, 0x03000303, + 0x03020101, 0x03020103, 0x03020301, 0x03020303, + 0x01010000, 0x01010002, 0x01010200, 0x01010202, + 0x01030000, 0x01030002, 0x01030200, 0x01030202, + 0x03010000, 0x03010002, 0x03010200, 0x03010202, + 0x03030000, 0x03030002, 0x03030200, 0x03030202, + 0x01010001, 0x01010003, 0x01010201, 0x01010203, + 0x01030001, 0x01030003, 0x01030201, 0x01030203, + 0x03010001, 0x03010003, 0x03010201, 0x03010203, + 0x03030001, 0x03030003, 0x03030201, 0x03030203, + 0x01010100, 0x01010102, 0x01010300, 0x01010302, + 0x01030100, 0x01030102, 0x01030300, 0x01030302, + 0x03010100, 0x03010102, 0x03010300, 0x03010302, + 0x03030100, 0x03030102, 0x03030300, 0x03030302, + 0x01010101, 0x01010103, 0x01010301, 0x01010303, + 0x01030101, 0x01030103, 0x01030301, 0x01030303, + 0x03010101, 0x03010103, 0x03010301, 0x03010303, + 0x03030101, 0x03030103, 0x03030301, 0x03030303 +}; +#endif + + +/* + * The SP table is actually the S boxes and the P permutation + * table combined. + */ +static u_long SP[8][64] = { + 0x00808200, 0x00000000, 0x00008000, 0x00808202, + 0x00808002, 0x00008202, 0x00000002, 0x00008000, + 0x00000200, 0x00808200, 0x00808202, 0x00000200, + 0x00800202, 0x00808002, 0x00800000, 0x00000002, + 0x00000202, 0x00800200, 0x00800200, 0x00008200, + 0x00008200, 0x00808000, 0x00808000, 0x00800202, + 0x00008002, 0x00800002, 0x00800002, 0x00008002, + 0x00000000, 0x00000202, 0x00008202, 0x00800000, + 0x00008000, 0x00808202, 0x00000002, 0x00808000, + 0x00808200, 0x00800000, 0x00800000, 0x00000200, + 0x00808002, 0x00008000, 0x00008200, 0x00800002, + 0x00000200, 0x00000002, 0x00800202, 0x00008202, + 0x00808202, 0x00008002, 0x00808000, 0x00800202, + 0x00800002, 0x00000202, 0x00008202, 0x00808200, + 0x00000202, 0x00800200, 0x00800200, 0x00000000, + 0x00008002, 0x00008200, 0x00000000, 0x00808002, + + 0x40084010, 0x40004000, 0x00004000, 0x00084010, + 0x00080000, 0x00000010, 0x40080010, 0x40004010, + 0x40000010, 0x40084010, 0x40084000, 0x40000000, + 0x40004000, 0x00080000, 0x00000010, 0x40080010, + 0x00084000, 0x00080010, 0x40004010, 0x00000000, + 0x40000000, 0x00004000, 0x00084010, 0x40080000, + 0x00080010, 0x40000010, 0x00000000, 0x00084000, + 0x00004010, 0x40084000, 0x40080000, 0x00004010, + 0x00000000, 0x00084010, 0x40080010, 0x00080000, + 0x40004010, 0x40080000, 0x40084000, 0x00004000, + 0x40080000, 0x40004000, 0x00000010, 0x40084010, + 0x00084010, 0x00000010, 0x00004000, 0x40000000, + 0x00004010, 0x40084000, 0x00080000, 0x40000010, + 0x00080010, 0x40004010, 0x40000010, 0x00080010, + 0x00084000, 0x00000000, 0x40004000, 0x00004010, + 0x40000000, 0x40080010, 0x40084010, 0x00084000, + + 0x00000104, 0x04010100, 0x00000000, 0x04010004, + 0x04000100, 0x00000000, 0x00010104, 0x04000100, + 0x00010004, 0x04000004, 0x04000004, 0x00010000, + 0x04010104, 0x00010004, 0x04010000, 0x00000104, + 0x04000000, 0x00000004, 0x04010100, 0x00000100, + 0x00010100, 0x04010000, 0x04010004, 0x00010104, + 0x04000104, 0x00010100, 0x00010000, 0x04000104, + 0x00000004, 0x04010104, 0x00000100, 0x04000000, + 0x04010100, 0x04000000, 0x00010004, 0x00000104, + 0x00010000, 0x04010100, 0x04000100, 0x00000000, + 0x00000100, 0x00010004, 0x04010104, 0x04000100, + 0x04000004, 0x00000100, 0x00000000, 0x04010004, + 0x04000104, 0x00010000, 0x04000000, 0x04010104, + 0x00000004, 0x00010104, 0x00010100, 0x04000004, + 0x04010000, 0x04000104, 0x00000104, 0x04010000, + 0x00010104, 0x00000004, 0x04010004, 0x00010100, + + 0x80401000, 0x80001040, 0x80001040, 0x00000040, + 0x00401040, 0x80400040, 0x80400000, 0x80001000, + 0x00000000, 0x00401000, 0x00401000, 0x80401040, + 0x80000040, 0x00000000, 0x00400040, 0x80400000, + 0x80000000, 0x00001000, 0x00400000, 0x80401000, + 0x00000040, 0x00400000, 0x80001000, 0x00001040, + 0x80400040, 0x80000000, 0x00001040, 0x00400040, + 0x00001000, 0x00401040, 0x80401040, 0x80000040, + 0x00400040, 0x80400000, 0x00401000, 0x80401040, + 0x80000040, 0x00000000, 0x00000000, 0x00401000, + 0x00001040, 0x00400040, 0x80400040, 0x80000000, + 0x80401000, 0x80001040, 0x80001040, 0x00000040, + 0x80401040, 0x80000040, 0x80000000, 0x00001000, + 0x80400000, 0x80001000, 0x00401040, 0x80400040, + 0x80001000, 0x00001040, 0x00400000, 0x80401000, + 0x00000040, 0x00400000, 0x00001000, 0x00401040, + + 0x00000080, 0x01040080, 0x01040000, 0x21000080, + 0x00040000, 0x00000080, 0x20000000, 0x01040000, + 0x20040080, 0x00040000, 0x01000080, 0x20040080, + 0x21000080, 0x21040000, 0x00040080, 0x20000000, + 0x01000000, 0x20040000, 0x20040000, 0x00000000, + 0x20000080, 0x21040080, 0x21040080, 0x01000080, + 0x21040000, 0x20000080, 0x00000000, 0x21000000, + 0x01040080, 0x01000000, 0x21000000, 0x00040080, + 0x00040000, 0x21000080, 0x00000080, 0x01000000, + 0x20000000, 0x01040000, 0x21000080, 0x20040080, + 0x01000080, 0x20000000, 0x21040000, 0x01040080, + 0x20040080, 0x00000080, 0x01000000, 0x21040000, + 0x21040080, 0x00040080, 0x21000000, 0x21040080, + 0x01040000, 0x00000000, 0x20040000, 0x21000000, + 0x00040080, 0x01000080, 0x20000080, 0x00040000, + 0x00000000, 0x20040000, 0x01040080, 0x20000080, + + 0x10000008, 0x10200000, 0x00002000, 0x10202008, + 0x10200000, 0x00000008, 0x10202008, 0x00200000, + 0x10002000, 0x00202008, 0x00200000, 0x10000008, + 0x00200008, 0x10002000, 0x10000000, 0x00002008, + 0x00000000, 0x00200008, 0x10002008, 0x00002000, + 0x00202000, 0x10002008, 0x00000008, 0x10200008, + 0x10200008, 0x00000000, 0x00202008, 0x10202000, + 0x00002008, 0x00202000, 0x10202000, 0x10000000, + 0x10002000, 0x00000008, 0x10200008, 0x00202000, + 0x10202008, 0x00200000, 0x00002008, 0x10000008, + 0x00200000, 0x10002000, 0x10000000, 0x00002008, + 0x10000008, 0x10202008, 0x00202000, 0x10200000, + 0x00202008, 0x10202000, 0x00000000, 0x10200008, + 0x00000008, 0x00002000, 0x10200000, 0x00202008, + 0x00002000, 0x00200008, 0x10002008, 0x00000000, + 0x10202000, 0x10000000, 0x00200008, 0x10002008, + + 0x00100000, 0x02100001, 0x02000401, 0x00000000, + 0x00000400, 0x02000401, 0x00100401, 0x02100400, + 0x02100401, 0x00100000, 0x00000000, 0x02000001, + 0x00000001, 0x02000000, 0x02100001, 0x00000401, + 0x02000400, 0x00100401, 0x00100001, 0x02000400, + 0x02000001, 0x02100000, 0x02100400, 0x00100001, + 0x02100000, 0x00000400, 0x00000401, 0x02100401, + 0x00100400, 0x00000001, 0x02000000, 0x00100400, + 0x02000000, 0x00100400, 0x00100000, 0x02000401, + 0x02000401, 0x02100001, 0x02100001, 0x00000001, + 0x00100001, 0x02000000, 0x02000400, 0x00100000, + 0x02100400, 0x00000401, 0x00100401, 0x02100400, + 0x00000401, 0x02000001, 0x02100401, 0x02100000, + 0x00100400, 0x00000000, 0x00000001, 0x02100401, + 0x00000000, 0x00100401, 0x02100000, 0x00000400, + 0x02000001, 0x02000400, 0x00000400, 0x00100001, + + 0x08000820, 0x00000800, 0x00020000, 0x08020820, + 0x08000000, 0x08000820, 0x00000020, 0x08000000, + 0x00020020, 0x08020000, 0x08020820, 0x00020800, + 0x08020800, 0x00020820, 0x00000800, 0x00000020, + 0x08020000, 0x08000020, 0x08000800, 0x00000820, + 0x00020800, 0x00020020, 0x08020020, 0x08020800, + 0x00000820, 0x00000000, 0x00000000, 0x08020020, + 0x08000020, 0x08000800, 0x00020820, 0x00020000, + 0x00020820, 0x00020000, 0x08020800, 0x00000800, + 0x00000020, 0x08020020, 0x00000800, 0x00020820, + 0x08000800, 0x00000020, 0x08000020, 0x08020000, + 0x08020020, 0x08000000, 0x00020000, 0x08000820, + 0x00000000, 0x08020820, 0x00020020, 0x08000020, + 0x08020000, 0x08000800, 0x08000820, 0x00000000, + 0x08020820, 0x00020800, 0x00020800, 0x00000820, + 0x00000820, 0x00020020, 0x08000000, 0x08020800 +}; + + + +/* + * DESauth_des - perform an in place DES encryption on 64 bits + * + * Note that the `data' argument is always in big-end-first + * byte order, i.e. *(char *)data is the high order byte of + * the 8 byte data word. We modify the initial and final + * permutation computations for little-end-first machines to + * swap bytes into the natural host order at the beginning and + * back to big-end order at the end. This is unclean but avoids + * a byte swapping performance penalty on Vaxes (which are slow already). + */ +void +DESauth_des(data, subkeys) + u_long *data; + u_char *subkeys; +{ + register u_long left, right; + register u_long temp; + register u_char *kp; + register int i; + + /* + * Do the initial permutation. The first operation gets + * all the bits which are used to form the left half of the + * permutted result in one word, which is then used to + * index the appropriate table a byte at a time. + */ + temp = ((*data & 0x55555555) << 1) | (*(data+1) & 0x55555555); +#ifdef XNTP_LITTLE_ENDIAN + /* + * Modify the computation to use the opposite set of bytes. + */ + left = (IP[(temp >> 24) & 0xff] << 3) + | (IP[(temp >> 16) & 0xff] << 2) + | (IP[(temp >> 8) & 0xff] << 1) + | IP[temp & 0xff]; +#else + left = IP[(temp >> 24) & 0xff] + | (IP[(temp >> 16) & 0xff] << 1) + | (IP[(temp >> 8) & 0xff] << 2) + | (IP[temp & 0xff] << 3); +#endif + + /* + * Same thing again except for the right half. + */ + temp = (*data & 0xaaaaaaaa) | ((*(data+1) & 0xaaaaaaaa) >> 1); +#ifdef XNTP_LITTLE_ENDIAN + right = (IP[(temp >> 24) & 0xff] << 3) + | (IP[(temp >> 16) & 0xff] << 2) + | (IP[(temp >> 8) & 0xff] << 1) + | IP[temp & 0xff]; +#else + right = IP[(temp >> 24) & 0xff] + | (IP[(temp >> 16) & 0xff] << 1) + | (IP[(temp >> 8) & 0xff] << 2) + | (IP[temp & 0xff] << 3); +#endif + + /* + * Do the 16 rounds through the cipher function. We actually + * do two at a time, one on the left half and one on the right + * half. + */ + kp = subkeys; + for (i = 0; i < 8; i++) { + /* + * The E expansion is easy to compute algorithmically. + * Take a look at its form and compare it to + * everything involving temp below. Note that + * since SP[0-7] don't have any bits in common set + * it is okay to do the successive xor's. + */ + temp = (right >> 1) | ((right & 1) ? 0x80000000 : 0); + left ^= SP[0][((temp >> 26) & 0x3f) ^ *kp++]; + left ^= SP[1][((temp >> 22) & 0x3f) ^ *kp++]; + left ^= SP[2][((temp >> 18) & 0x3f) ^ *kp++]; + left ^= SP[3][((temp >> 14) & 0x3f) ^ *kp++]; + left ^= SP[4][((temp >> 10) & 0x3f) ^ *kp++]; + left ^= SP[5][((temp >> 6) & 0x3f) ^ *kp++]; + left ^= SP[6][((temp >> 2) & 0x3f) ^ *kp++]; + left ^= SP[7][(((right << 1) | ((right & 0x80000000)?1:0)) + & 0x3f) ^ *kp++]; + + /* + * Careful here. Right now `right' is actually the + * left side and `left' is the right side. Do the + * same thing again, except swap `left' and `right' + */ + temp = (left >> 1) | ((left & 1) ? 0x80000000 : 0); + right ^= SP[0][((temp >> 26) & 0x3f) ^ *kp++]; + right ^= SP[1][((temp >> 22) & 0x3f) ^ *kp++]; + right ^= SP[2][((temp >> 18) & 0x3f) ^ *kp++]; + right ^= SP[3][((temp >> 14) & 0x3f) ^ *kp++]; + right ^= SP[4][((temp >> 10) & 0x3f) ^ *kp++]; + right ^= SP[5][((temp >> 6) & 0x3f) ^ *kp++]; + right ^= SP[6][((temp >> 2) & 0x3f) ^ *kp++]; + right ^= SP[7][(((left << 1) | ((left & 0x80000000)?1:0)) + & 0x3f) ^ *kp++]; + + /* + * By the time we get here, all is straightened out + * again. `left' is left and `right' is right. + */ + } + + /* + * Now the final permutation. Note this is like the IP above + * except that the data is computed from + * + * ((left & 0x0f0f0f0f) << 4) | (right & 0x0f0f0f0f) for left result + * (left & 0xf0f0f0f0) | ((right & 0xf0f0f0f0) >> 4) for right result + * + * Just to confuse things more, we're supposed to swap the right + * and the left halves before doing this. Instead, we'll just + * switch which goes where when computing the temporary. + * + * This operation also byte swaps stuff back into big end byte + * order. This is accomplished by modifying the FP table for + * little end machines, however, so we don't have to worry about + * it here. + */ + temp = ((right & 0x0f0f0f0f) << 4) | (left & 0x0f0f0f0f); + *data = (FP[(temp >> 24) & 0xff] << 6) + | (FP[(temp >> 16) & 0xff] << 4) + | (FP[(temp >> 8) & 0xff] << 2) + | FP[temp & 0xff]; + + temp = (right & 0xf0f0f0f0) | ((left & 0xf0f0f0f0) >> 4); + *(data+1) = (FP[(temp >> 24) & 0xff] << 6) + | (FP[(temp >> 16) & 0xff] << 4) + | (FP[(temp >> 8) & 0xff] << 2) + | FP[temp & 0xff]; +}; |
