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Diffstat (limited to 'src/des_impl.c')
| -rw-r--r-- | src/des_impl.c | 594 |
1 files changed, 594 insertions, 0 deletions
diff --git a/src/des_impl.c b/src/des_impl.c new file mode 100644 index 0000000..15bec2a --- /dev/null +++ b/src/des_impl.c @@ -0,0 +1,594 @@ +/* Copyright (C) 1992 Eric Young */ +/* Collected from libdes and modified for SECURE RPC by Martin Kuck 1994 */ +/* This file is distributed under the terms of the GNU Lesser General */ +/* Public License, version 2.1 or later - see the file COPYING.LIB for details.*/ +/* If you did not receive a copy of the license with this program, please*/ +/* see <http://www.gnu.org/licenses/> to obtain a copy. */ +#include <string.h> +#include <stdint.h> +#include <sys/types.h> +#include <rpc/des.h> + + +static const uint32_t des_SPtrans[8][64] = +{ + { /* nibble 0 */ + 0x00820200, 0x00020000, 0x80800000, 0x80820200, + 0x00800000, 0x80020200, 0x80020000, 0x80800000, + 0x80020200, 0x00820200, 0x00820000, 0x80000200, + 0x80800200, 0x00800000, 0x00000000, 0x80020000, + 0x00020000, 0x80000000, 0x00800200, 0x00020200, + 0x80820200, 0x00820000, 0x80000200, 0x00800200, + 0x80000000, 0x00000200, 0x00020200, 0x80820000, + 0x00000200, 0x80800200, 0x80820000, 0x00000000, + 0x00000000, 0x80820200, 0x00800200, 0x80020000, + 0x00820200, 0x00020000, 0x80000200, 0x00800200, + 0x80820000, 0x00000200, 0x00020200, 0x80800000, + 0x80020200, 0x80000000, 0x80800000, 0x00820000, + 0x80820200, 0x00020200, 0x00820000, 0x80800200, + 0x00800000, 0x80000200, 0x80020000, 0x00000000, + 0x00020000, 0x00800000, 0x80800200, 0x00820200, + 0x80000000, 0x80820000, 0x00000200, 0x80020200}, + + { /* nibble 1 */ + 0x10042004, 0x00000000, 0x00042000, 0x10040000, + 0x10000004, 0x00002004, 0x10002000, 0x00042000, + 0x00002000, 0x10040004, 0x00000004, 0x10002000, + 0x00040004, 0x10042000, 0x10040000, 0x00000004, + 0x00040000, 0x10002004, 0x10040004, 0x00002000, + 0x00042004, 0x10000000, 0x00000000, 0x00040004, + 0x10002004, 0x00042004, 0x10042000, 0x10000004, + 0x10000000, 0x00040000, 0x00002004, 0x10042004, + 0x00040004, 0x10042000, 0x10002000, 0x00042004, + 0x10042004, 0x00040004, 0x10000004, 0x00000000, + 0x10000000, 0x00002004, 0x00040000, 0x10040004, + 0x00002000, 0x10000000, 0x00042004, 0x10002004, + 0x10042000, 0x00002000, 0x00000000, 0x10000004, + 0x00000004, 0x10042004, 0x00042000, 0x10040000, + 0x10040004, 0x00040000, 0x00002004, 0x10002000, + 0x10002004, 0x00000004, 0x10040000, 0x00042000}, + + { /* nibble 2 */ + 0x41000000, 0x01010040, 0x00000040, 0x41000040, + 0x40010000, 0x01000000, 0x41000040, 0x00010040, + 0x01000040, 0x00010000, 0x01010000, 0x40000000, + 0x41010040, 0x40000040, 0x40000000, 0x41010000, + 0x00000000, 0x40010000, 0x01010040, 0x00000040, + 0x40000040, 0x41010040, 0x00010000, 0x41000000, + 0x41010000, 0x01000040, 0x40010040, 0x01010000, + 0x00010040, 0x00000000, 0x01000000, 0x40010040, + 0x01010040, 0x00000040, 0x40000000, 0x00010000, + 0x40000040, 0x40010000, 0x01010000, 0x41000040, + 0x00000000, 0x01010040, 0x00010040, 0x41010000, + 0x40010000, 0x01000000, 0x41010040, 0x40000000, + 0x40010040, 0x41000000, 0x01000000, 0x41010040, + 0x00010000, 0x01000040, 0x41000040, 0x00010040, + 0x01000040, 0x00000000, 0x41010000, 0x40000040, + 0x41000000, 0x40010040, 0x00000040, 0x01010000}, + + { /* nibble 3 */ + 0x00100402, 0x04000400, 0x00000002, 0x04100402, + 0x00000000, 0x04100000, 0x04000402, 0x00100002, + 0x04100400, 0x04000002, 0x04000000, 0x00000402, + 0x04000002, 0x00100402, 0x00100000, 0x04000000, + 0x04100002, 0x00100400, 0x00000400, 0x00000002, + 0x00100400, 0x04000402, 0x04100000, 0x00000400, + 0x00000402, 0x00000000, 0x00100002, 0x04100400, + 0x04000400, 0x04100002, 0x04100402, 0x00100000, + 0x04100002, 0x00000402, 0x00100000, 0x04000002, + 0x00100400, 0x04000400, 0x00000002, 0x04100000, + 0x04000402, 0x00000000, 0x00000400, 0x00100002, + 0x00000000, 0x04100002, 0x04100400, 0x00000400, + 0x04000000, 0x04100402, 0x00100402, 0x00100000, + 0x04100402, 0x00000002, 0x04000400, 0x00100402, + 0x00100002, 0x00100400, 0x04100000, 0x04000402, + 0x00000402, 0x04000000, 0x04000002, 0x04100400}, + + { /* nibble 4 */ + 0x02000000, 0x00004000, 0x00000100, 0x02004108, + 0x02004008, 0x02000100, 0x00004108, 0x02004000, + 0x00004000, 0x00000008, 0x02000008, 0x00004100, + 0x02000108, 0x02004008, 0x02004100, 0x00000000, + 0x00004100, 0x02000000, 0x00004008, 0x00000108, + 0x02000100, 0x00004108, 0x00000000, 0x02000008, + 0x00000008, 0x02000108, 0x02004108, 0x00004008, + 0x02004000, 0x00000100, 0x00000108, 0x02004100, + 0x02004100, 0x02000108, 0x00004008, 0x02004000, + 0x00004000, 0x00000008, 0x02000008, 0x02000100, + 0x02000000, 0x00004100, 0x02004108, 0x00000000, + 0x00004108, 0x02000000, 0x00000100, 0x00004008, + 0x02000108, 0x00000100, 0x00000000, 0x02004108, + 0x02004008, 0x02004100, 0x00000108, 0x00004000, + 0x00004100, 0x02004008, 0x02000100, 0x00000108, + 0x00000008, 0x00004108, 0x02004000, 0x02000008}, + + { /* nibble 5 */ + 0x20000010, 0x00080010, 0x00000000, 0x20080800, + 0x00080010, 0x00000800, 0x20000810, 0x00080000, + 0x00000810, 0x20080810, 0x00080800, 0x20000000, + 0x20000800, 0x20000010, 0x20080000, 0x00080810, + 0x00080000, 0x20000810, 0x20080010, 0x00000000, + 0x00000800, 0x00000010, 0x20080800, 0x20080010, + 0x20080810, 0x20080000, 0x20000000, 0x00000810, + 0x00000010, 0x00080800, 0x00080810, 0x20000800, + 0x00000810, 0x20000000, 0x20000800, 0x00080810, + 0x20080800, 0x00080010, 0x00000000, 0x20000800, + 0x20000000, 0x00000800, 0x20080010, 0x00080000, + 0x00080010, 0x20080810, 0x00080800, 0x00000010, + 0x20080810, 0x00080800, 0x00080000, 0x20000810, + 0x20000010, 0x20080000, 0x00080810, 0x00000000, + 0x00000800, 0x20000010, 0x20000810, 0x20080800, + 0x20080000, 0x00000810, 0x00000010, 0x20080010}, + + { /* nibble 6 */ + 0x00001000, 0x00000080, 0x00400080, 0x00400001, + 0x00401081, 0x00001001, 0x00001080, 0x00000000, + 0x00400000, 0x00400081, 0x00000081, 0x00401000, + 0x00000001, 0x00401080, 0x00401000, 0x00000081, + 0x00400081, 0x00001000, 0x00001001, 0x00401081, + 0x00000000, 0x00400080, 0x00400001, 0x00001080, + 0x00401001, 0x00001081, 0x00401080, 0x00000001, + 0x00001081, 0x00401001, 0x00000080, 0x00400000, + 0x00001081, 0x00401000, 0x00401001, 0x00000081, + 0x00001000, 0x00000080, 0x00400000, 0x00401001, + 0x00400081, 0x00001081, 0x00001080, 0x00000000, + 0x00000080, 0x00400001, 0x00000001, 0x00400080, + 0x00000000, 0x00400081, 0x00400080, 0x00001080, + 0x00000081, 0x00001000, 0x00401081, 0x00400000, + 0x00401080, 0x00000001, 0x00001001, 0x00401081, + 0x00400001, 0x00401080, 0x00401000, 0x00001001}, + + { /* nibble 7 */ + 0x08200020, 0x08208000, 0x00008020, 0x00000000, + 0x08008000, 0x00200020, 0x08200000, 0x08208020, + 0x00000020, 0x08000000, 0x00208000, 0x00008020, + 0x00208020, 0x08008020, 0x08000020, 0x08200000, + 0x00008000, 0x00208020, 0x00200020, 0x08008000, + 0x08208020, 0x08000020, 0x00000000, 0x00208000, + 0x08000000, 0x00200000, 0x08008020, 0x08200020, + 0x00200000, 0x00008000, 0x08208000, 0x00000020, + 0x00200000, 0x00008000, 0x08000020, 0x08208020, + 0x00008020, 0x08000000, 0x00000000, 0x00208000, + 0x08200020, 0x08008020, 0x08008000, 0x00200020, + 0x08208000, 0x00000020, 0x00200020, 0x08008000, + 0x08208020, 0x00200000, 0x08200000, 0x08000020, + 0x00208000, 0x00008020, 0x08008020, 0x08200000, + 0x00000020, 0x08208000, 0x00208020, 0x00000000, + 0x08000000, 0x08200020, 0x00008000, 0x00208020}}; + +static const uint32_t des_skb[8][64] = +{ + { /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ + 0x00000000, 0x00000010, 0x20000000, 0x20000010, + 0x00010000, 0x00010010, 0x20010000, 0x20010010, + 0x00000800, 0x00000810, 0x20000800, 0x20000810, + 0x00010800, 0x00010810, 0x20010800, 0x20010810, + 0x00000020, 0x00000030, 0x20000020, 0x20000030, + 0x00010020, 0x00010030, 0x20010020, 0x20010030, + 0x00000820, 0x00000830, 0x20000820, 0x20000830, + 0x00010820, 0x00010830, 0x20010820, 0x20010830, + 0x00080000, 0x00080010, 0x20080000, 0x20080010, + 0x00090000, 0x00090010, 0x20090000, 0x20090010, + 0x00080800, 0x00080810, 0x20080800, 0x20080810, + 0x00090800, 0x00090810, 0x20090800, 0x20090810, + 0x00080020, 0x00080030, 0x20080020, 0x20080030, + 0x00090020, 0x00090030, 0x20090020, 0x20090030, + 0x00080820, 0x00080830, 0x20080820, 0x20080830, + 0x00090820, 0x00090830, 0x20090820, 0x20090830}, + { /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */ + 0x00000000, 0x02000000, 0x00002000, 0x02002000, + 0x00200000, 0x02200000, 0x00202000, 0x02202000, + 0x00000004, 0x02000004, 0x00002004, 0x02002004, + 0x00200004, 0x02200004, 0x00202004, 0x02202004, + 0x00000400, 0x02000400, 0x00002400, 0x02002400, + 0x00200400, 0x02200400, 0x00202400, 0x02202400, + 0x00000404, 0x02000404, 0x00002404, 0x02002404, + 0x00200404, 0x02200404, 0x00202404, 0x02202404, + 0x10000000, 0x12000000, 0x10002000, 0x12002000, + 0x10200000, 0x12200000, 0x10202000, 0x12202000, + 0x10000004, 0x12000004, 0x10002004, 0x12002004, + 0x10200004, 0x12200004, 0x10202004, 0x12202004, + 0x10000400, 0x12000400, 0x10002400, 0x12002400, + 0x10200400, 0x12200400, 0x10202400, 0x12202400, + 0x10000404, 0x12000404, 0x10002404, 0x12002404, + 0x10200404, 0x12200404, 0x10202404, 0x12202404}, + { /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */ + 0x00000000, 0x00000001, 0x00040000, 0x00040001, + 0x01000000, 0x01000001, 0x01040000, 0x01040001, + 0x00000002, 0x00000003, 0x00040002, 0x00040003, + 0x01000002, 0x01000003, 0x01040002, 0x01040003, + 0x00000200, 0x00000201, 0x00040200, 0x00040201, + 0x01000200, 0x01000201, 0x01040200, 0x01040201, + 0x00000202, 0x00000203, 0x00040202, 0x00040203, + 0x01000202, 0x01000203, 0x01040202, 0x01040203, + 0x08000000, 0x08000001, 0x08040000, 0x08040001, + 0x09000000, 0x09000001, 0x09040000, 0x09040001, + 0x08000002, 0x08000003, 0x08040002, 0x08040003, + 0x09000002, 0x09000003, 0x09040002, 0x09040003, + 0x08000200, 0x08000201, 0x08040200, 0x08040201, + 0x09000200, 0x09000201, 0x09040200, 0x09040201, + 0x08000202, 0x08000203, 0x08040202, 0x08040203, + 0x09000202, 0x09000203, 0x09040202, 0x09040203}, + { /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */ + 0x00000000, 0x00100000, 0x00000100, 0x00100100, + 0x00000008, 0x00100008, 0x00000108, 0x00100108, + 0x00001000, 0x00101000, 0x00001100, 0x00101100, + 0x00001008, 0x00101008, 0x00001108, 0x00101108, + 0x04000000, 0x04100000, 0x04000100, 0x04100100, + 0x04000008, 0x04100008, 0x04000108, 0x04100108, + 0x04001000, 0x04101000, 0x04001100, 0x04101100, + 0x04001008, 0x04101008, 0x04001108, 0x04101108, + 0x00020000, 0x00120000, 0x00020100, 0x00120100, + 0x00020008, 0x00120008, 0x00020108, 0x00120108, + 0x00021000, 0x00121000, 0x00021100, 0x00121100, + 0x00021008, 0x00121008, 0x00021108, 0x00121108, + 0x04020000, 0x04120000, 0x04020100, 0x04120100, + 0x04020008, 0x04120008, 0x04020108, 0x04120108, + 0x04021000, 0x04121000, 0x04021100, 0x04121100, + 0x04021008, 0x04121008, 0x04021108, 0x04121108}, + { /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ + 0x00000000, 0x10000000, 0x00010000, 0x10010000, + 0x00000004, 0x10000004, 0x00010004, 0x10010004, + 0x20000000, 0x30000000, 0x20010000, 0x30010000, + 0x20000004, 0x30000004, 0x20010004, 0x30010004, + 0x00100000, 0x10100000, 0x00110000, 0x10110000, + 0x00100004, 0x10100004, 0x00110004, 0x10110004, + 0x20100000, 0x30100000, 0x20110000, 0x30110000, + 0x20100004, 0x30100004, 0x20110004, 0x30110004, + 0x00001000, 0x10001000, 0x00011000, 0x10011000, + 0x00001004, 0x10001004, 0x00011004, 0x10011004, + 0x20001000, 0x30001000, 0x20011000, 0x30011000, + 0x20001004, 0x30001004, 0x20011004, 0x30011004, + 0x00101000, 0x10101000, 0x00111000, 0x10111000, + 0x00101004, 0x10101004, 0x00111004, 0x10111004, + 0x20101000, 0x30101000, 0x20111000, 0x30111000, + 0x20101004, 0x30101004, 0x20111004, 0x30111004}, + { /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */ + 0x00000000, 0x08000000, 0x00000008, 0x08000008, + 0x00000400, 0x08000400, 0x00000408, 0x08000408, + 0x00020000, 0x08020000, 0x00020008, 0x08020008, + 0x00020400, 0x08020400, 0x00020408, 0x08020408, + 0x00000001, 0x08000001, 0x00000009, 0x08000009, + 0x00000401, 0x08000401, 0x00000409, 0x08000409, + 0x00020001, 0x08020001, 0x00020009, 0x08020009, + 0x00020401, 0x08020401, 0x00020409, 0x08020409, + 0x02000000, 0x0A000000, 0x02000008, 0x0A000008, + 0x02000400, 0x0A000400, 0x02000408, 0x0A000408, + 0x02020000, 0x0A020000, 0x02020008, 0x0A020008, + 0x02020400, 0x0A020400, 0x02020408, 0x0A020408, + 0x02000001, 0x0A000001, 0x02000009, 0x0A000009, + 0x02000401, 0x0A000401, 0x02000409, 0x0A000409, + 0x02020001, 0x0A020001, 0x02020009, 0x0A020009, + 0x02020401, 0x0A020401, 0x02020409, 0x0A020409}, + { /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */ + 0x00000000, 0x00000100, 0x00080000, 0x00080100, + 0x01000000, 0x01000100, 0x01080000, 0x01080100, + 0x00000010, 0x00000110, 0x00080010, 0x00080110, + 0x01000010, 0x01000110, 0x01080010, 0x01080110, + 0x00200000, 0x00200100, 0x00280000, 0x00280100, + 0x01200000, 0x01200100, 0x01280000, 0x01280100, + 0x00200010, 0x00200110, 0x00280010, 0x00280110, + 0x01200010, 0x01200110, 0x01280010, 0x01280110, + 0x00000200, 0x00000300, 0x00080200, 0x00080300, + 0x01000200, 0x01000300, 0x01080200, 0x01080300, + 0x00000210, 0x00000310, 0x00080210, 0x00080310, + 0x01000210, 0x01000310, 0x01080210, 0x01080310, + 0x00200200, 0x00200300, 0x00280200, 0x00280300, + 0x01200200, 0x01200300, 0x01280200, 0x01280300, + 0x00200210, 0x00200310, 0x00280210, 0x00280310, + 0x01200210, 0x01200310, 0x01280210, 0x01280310}, + { /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */ + 0x00000000, 0x04000000, 0x00040000, 0x04040000, + 0x00000002, 0x04000002, 0x00040002, 0x04040002, + 0x00002000, 0x04002000, 0x00042000, 0x04042000, + 0x00002002, 0x04002002, 0x00042002, 0x04042002, + 0x00000020, 0x04000020, 0x00040020, 0x04040020, + 0x00000022, 0x04000022, 0x00040022, 0x04040022, + 0x00002020, 0x04002020, 0x00042020, 0x04042020, + 0x00002022, 0x04002022, 0x00042022, 0x04042022, + 0x00000800, 0x04000800, 0x00040800, 0x04040800, + 0x00000802, 0x04000802, 0x00040802, 0x04040802, + 0x00002800, 0x04002800, 0x00042800, 0x04042800, + 0x00002802, 0x04002802, 0x00042802, 0x04042802, + 0x00000820, 0x04000820, 0x00040820, 0x04040820, + 0x00000822, 0x04000822, 0x00040822, 0x04040822, + 0x00002820, 0x04002820, 0x00042820, 0x04042820, + 0x00002822, 0x04002822, 0x00042822, 0x04042822}, +}; + +#define c2l(c,l) (l =((unsigned long)(*((c)++))) , \ + l|=((unsigned long)(*((c)++)))<< 8, \ + l|=((unsigned long)(*((c)++)))<<16, \ + l|=((unsigned long)(*((c)++)))<<24) + +#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ + *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ + *((c)++)=(unsigned char)(((l)>>16)&0xff), \ + *((c)++)=(unsigned char)(((l)>>24)&0xff)) + +/* + * IP and FP + * The problem is more of a geometric problem that random bit fiddling. + * 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 + * 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 + * 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 + * 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 + * + * 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 + * 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 + * 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 + * 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 + * + * The output has been subject to swaps of the form + * 0 1 -> 3 1 but the odd and even bits have been put into + * 2 3 2 0 + * different words. The main trick is to remember that + * t=((l>>size)^r)&(mask); + * r^=t; + * l^=(t<<size); + * can be used to swap and move bits between words. + * + * So l = 0 1 2 3 r = 16 17 18 19 + * 4 5 6 7 20 21 22 23 + * 8 9 10 11 24 25 26 27 + * 12 13 14 15 28 29 30 31 + * becomes (for size == 2 and mask == 0x3333) + * t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 + * 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 + * 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 + * 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 + * + * Thanks for hints from Richard Outerbridge - he told me IP&FP + * could be done in 15 xor, 10 shifts and 5 ands. + * When I finally started to think of the problem in 2D + * I first got ~42 operations without xors. When I remembered + * how to use xors I got it to its final state. + */ + +#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ + (b)^=(t),\ + (a)^=((t)<<(n))) + +#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ + (a)=(a)^(t)^(t>>(16-(n)))) + + +#define D_ENCRYPT(L,R,S) \ + u=(R^s[S ]); \ + t=R^s[S+1]; \ + t=((t>>4)+(t<<28)); \ + L^= des_SPtrans[1][(t )&0x3f]| \ + des_SPtrans[3][(t>> 8)&0x3f]| \ + des_SPtrans[5][(t>>16)&0x3f]| \ + des_SPtrans[7][(t>>24)&0x3f]| \ + des_SPtrans[0][(u )&0x3f]| \ + des_SPtrans[2][(u>> 8)&0x3f]| \ + des_SPtrans[4][(u>>16)&0x3f]| \ + des_SPtrans[6][(u>>24)&0x3f]; + +#define ITERATIONS 16 + +static const char shifts2[16] = +{0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0}; + +static void des_set_key (unsigned char *, unsigned long *); +static void des_encrypt (unsigned long *, unsigned long *, int); +int _des_crypt (char *, unsigned, struct desparams *); + +static void +des_set_key (unsigned char *key, unsigned long *schedule) +{ + register unsigned long c, d, t, s; + register unsigned char *in; + register unsigned long *k; + register int i; + + k = (unsigned long *) schedule; + in = key; + + c2l (in, c); + c2l (in, d); + + /* I now do it in 47 simple operations + * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) + * for the inspiration. */ + PERM_OP (d, c, t, 4, 0x0f0f0f0f); + HPERM_OP (c, t, -2, 0xcccc0000); + HPERM_OP (d, t, -2, 0xcccc0000); + PERM_OP (d, c, t, 1, 0x55555555); + PERM_OP (c, d, t, 8, 0x00ff00ff); + PERM_OP (d, c, t, 1, 0x55555555); + d = (((d & 0x000000ff) << 16) | (d & 0x0000ff00) | + ((d & 0x00ff0000) >> 16) | ((c & 0xf0000000) >> 4)); + c &= 0x0fffffff; + + for (i = 0; i < ITERATIONS; i++) + { + if (shifts2[i]) + { + c = ((c >> 2) | (c << 26)); + d = ((d >> 2) | (d << 26)); + } + else + { + c = ((c >> 1) | (c << 27)); + d = ((d >> 1) | (d << 27)); + } + c &= 0x0fffffff; + d &= 0x0fffffff; + /* could be a few less shifts but I am to lazy at this + * point in time to investigate */ + s = des_skb[0][(c) & 0x3f] | + des_skb[1][((c >> 6) & 0x03) | ((c >> 7) & 0x3c)] | + des_skb[2][((c >> 13) & 0x0f) | ((c >> 14) & 0x30)] | + des_skb[3][((c >> 20) & 0x01) | ((c >> 21) & 0x06) | ((c >> 22) & 0x38)]; + t = des_skb[4][(d) & 0x3f] | + des_skb[5][((d >> 7) & 0x03) | ((d >> 8) & 0x3c)] | + des_skb[6][(d >> 15) & 0x3f] | + des_skb[7][((d >> 21) & 0x0f) | ((d >> 22) & 0x30)]; + + /* table contained 0213 4657 */ + *(k++) = ((t << 16) | (s & 0x0000ffff)) & 0xffffffff; + s = ((s >> 16) | (t & 0xffff0000)); + + s = (s << 4) | (s >> 28); + *(k++) = s & 0xffffffff; + } +} + + +static void +des_encrypt (unsigned long *buf, unsigned long *schedule, int encrypt) +{ + register unsigned long l, r, t, u; + register int i; + register unsigned long *s; + + l = buf[0]; + r = buf[1]; + + /* do IP */ + PERM_OP (r, l, t, 4, 0x0f0f0f0f); + PERM_OP (l, r, t, 16, 0x0000ffff); + PERM_OP (r, l, t, 2, 0x33333333); + PERM_OP (l, r, t, 8, 0x00ff00ff); + PERM_OP (r, l, t, 1, 0x55555555); + /* r and l are reversed - remember that - fix + * it in the next step */ + + /* Things have been modified so that the initial rotate is + * done outside the loop. This required the + * des_SPtrans values in sp.h to be rotated 1 bit to the right. + * One perl script later and things have a 5% speed up on a sparc2. + * Thanks to Richard Outerbridge <71755.204@CompuServe.COM> + * for pointing this out. */ + t = (r << 1) | (r >> 31); + r = (l << 1) | (l >> 31); + l = t; + + /* clear the top bits on machines with 8byte longs */ + l &= 0xffffffff; + r &= 0xffffffff; + + s = (unsigned long *) schedule; + /* I don't know if it is worth the effort of loop unrolling the + * inner loop */ + if (encrypt) + { + for (i = 0; i < 32; i += 4) + { + D_ENCRYPT (l, r, i + 0); /* 1 */ + D_ENCRYPT (r, l, i + 2); /* 2 */ + } + } + else + { + for (i = 30; i > 0; i -= 4) + { + D_ENCRYPT (l, r, i - 0); /* 16 */ + D_ENCRYPT (r, l, i - 2); /* 15 */ + } + } + l = (l >> 1) | (l << 31); + r = (r >> 1) | (r << 31); + /* clear the top bits on machines with 8byte longs */ + l &= 0xffffffff; + r &= 0xffffffff; + + /* swap l and r + * we will not do the swap so just remember they are + * reversed for the rest of the subroutine + * luckily FP fixes this problem */ + + PERM_OP (r, l, t, 1, 0x55555555); + PERM_OP (l, r, t, 8, 0x00ff00ff); + PERM_OP (r, l, t, 2, 0x33333333); + PERM_OP (l, r, t, 16, 0x0000ffff); + PERM_OP (r, l, t, 4, 0x0f0f0f0f); + + buf[0] = l; + buf[1] = r; + + l = r = t = u = 0; +} + + +int +_des_crypt (char *buf, unsigned len, struct desparams *desp) +{ + unsigned long schedule[32]; + register unsigned long tin0, tin1; + register unsigned long tout0, tout1, xor0, xor1; + register unsigned char *in, *out; + unsigned long tbuf[2]; + unsigned char *iv, *oiv; + int cbc_mode; + + cbc_mode = (desp->des_mode == CBC) ? 1 : 0; + + in = (unsigned char *) buf; + out = (unsigned char *) buf; + oiv = iv = (unsigned char *) desp->des_ivec; + + des_set_key (desp->des_key, schedule); + + tin0 = tin1 = 0; /* For GCC */ + if (desp->des_dir == ENCRYPT) + { + c2l (iv, tout0); + c2l (iv, tout1); + for (; len > 0; len -= 8) + { + c2l (in, tin0); + c2l (in, tin1); + if (cbc_mode) + { + tin0 ^= tout0; + tin1 ^= tout1; + } + tbuf[0] = tin0; + tbuf[1] = tin1; + des_encrypt (tbuf, schedule, 1); + tout0 = tbuf[0]; + tout1 = tbuf[1]; + l2c (tout0, out); + l2c (tout1, out); + } + l2c (tout0, oiv); + l2c (tout1, oiv); + } + else + { + c2l (iv, xor0); + c2l (iv, xor1); + for (; len > 0; len -= 8) + { + c2l (in, tin0); + c2l (in, tin1); + tbuf[0] = tin0; + tbuf[1] = tin1; + des_encrypt (tbuf, schedule, 0); + if (cbc_mode) + { + tout0 = tbuf[0] ^ xor0; + tout1 = tbuf[1] ^ xor1; + xor0 = tin0; + xor1 = tin1; + } + else + { + tout0 = tbuf[0]; + tout1 = tbuf[1]; + } + l2c (tout0, out); + l2c (tout1, out); + } + l2c (tin0, oiv); + l2c (tin1, oiv); + } + tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; + tbuf[0] = tbuf[1] = 0; + memset (schedule, 0, sizeof (schedule)); + + return (1); +} |