andre@0: /*
andre@0:  *  des.c
andre@0:  *
andre@0:  *  core source file for DES-150 library
andre@0:  *  Make key schedule from DES key.
andre@0:  *  Encrypt/Decrypt one 8-byte block.
andre@0:  *
andre@0:  * This Source Code Form is subject to the terms of the Mozilla Public
andre@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
andre@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
andre@0: 
andre@0: #include "des.h"
andre@0: #include <stddef.h>	/* for ptrdiff_t */
andre@0: /* #define USE_INDEXING 1 */
andre@0: 
andre@0: /*
andre@0:  * The tables below are the 8 sbox functions, with the 6-bit input permutation 
andre@0:  * and the 32-bit output permutation pre-computed.
andre@0:  * They are shifted circularly to the left 3 bits, which removes 2 shifts
andre@0:  * and an or from each round by reducing the number of sboxes whose
andre@0:  * indices cross word broundaries from 2 to 1.  
andre@0:  */
andre@0: 
andre@0: static const HALF SP[8][64] = {
andre@0: /* Box S1 */ { 
andre@0: 	0x04041000, 0x00000000, 0x00040000, 0x04041010, 
andre@0: 	0x04040010, 0x00041010, 0x00000010, 0x00040000, 
andre@0: 	0x00001000, 0x04041000, 0x04041010, 0x00001000, 
andre@0: 	0x04001010, 0x04040010, 0x04000000, 0x00000010, 
andre@0: 	0x00001010, 0x04001000, 0x04001000, 0x00041000, 
andre@0: 	0x00041000, 0x04040000, 0x04040000, 0x04001010, 
andre@0: 	0x00040010, 0x04000010, 0x04000010, 0x00040010, 
andre@0: 	0x00000000, 0x00001010, 0x00041010, 0x04000000, 
andre@0: 	0x00040000, 0x04041010, 0x00000010, 0x04040000, 
andre@0: 	0x04041000, 0x04000000, 0x04000000, 0x00001000, 
andre@0: 	0x04040010, 0x00040000, 0x00041000, 0x04000010, 
andre@0: 	0x00001000, 0x00000010, 0x04001010, 0x00041010, 
andre@0: 	0x04041010, 0x00040010, 0x04040000, 0x04001010, 
andre@0: 	0x04000010, 0x00001010, 0x00041010, 0x04041000, 
andre@0: 	0x00001010, 0x04001000, 0x04001000, 0x00000000, 
andre@0: 	0x00040010, 0x00041000, 0x00000000, 0x04040010
andre@0:     },
andre@0: /* Box S2 */ { 
andre@0: 	0x00420082, 0x00020002, 0x00020000, 0x00420080, 
andre@0: 	0x00400000, 0x00000080, 0x00400082, 0x00020082, 
andre@0: 	0x00000082, 0x00420082, 0x00420002, 0x00000002, 
andre@0: 	0x00020002, 0x00400000, 0x00000080, 0x00400082, 
andre@0: 	0x00420000, 0x00400080, 0x00020082, 0x00000000, 
andre@0: 	0x00000002, 0x00020000, 0x00420080, 0x00400002, 
andre@0: 	0x00400080, 0x00000082, 0x00000000, 0x00420000, 
andre@0: 	0x00020080, 0x00420002, 0x00400002, 0x00020080, 
andre@0: 	0x00000000, 0x00420080, 0x00400082, 0x00400000, 
andre@0: 	0x00020082, 0x00400002, 0x00420002, 0x00020000, 
andre@0: 	0x00400002, 0x00020002, 0x00000080, 0x00420082, 
andre@0: 	0x00420080, 0x00000080, 0x00020000, 0x00000002, 
andre@0: 	0x00020080, 0x00420002, 0x00400000, 0x00000082, 
andre@0: 	0x00400080, 0x00020082, 0x00000082, 0x00400080, 
andre@0: 	0x00420000, 0x00000000, 0x00020002, 0x00020080, 
andre@0: 	0x00000002, 0x00400082, 0x00420082, 0x00420000 
andre@0:     },
andre@0: /* Box S3 */ { 
andre@0: 	0x00000820, 0x20080800, 0x00000000, 0x20080020, 
andre@0: 	0x20000800, 0x00000000, 0x00080820, 0x20000800, 
andre@0: 	0x00080020, 0x20000020, 0x20000020, 0x00080000, 
andre@0: 	0x20080820, 0x00080020, 0x20080000, 0x00000820, 
andre@0: 	0x20000000, 0x00000020, 0x20080800, 0x00000800, 
andre@0: 	0x00080800, 0x20080000, 0x20080020, 0x00080820, 
andre@0: 	0x20000820, 0x00080800, 0x00080000, 0x20000820, 
andre@0: 	0x00000020, 0x20080820, 0x00000800, 0x20000000, 
andre@0: 	0x20080800, 0x20000000, 0x00080020, 0x00000820, 
andre@0: 	0x00080000, 0x20080800, 0x20000800, 0x00000000, 
andre@0: 	0x00000800, 0x00080020, 0x20080820, 0x20000800, 
andre@0: 	0x20000020, 0x00000800, 0x00000000, 0x20080020, 
andre@0: 	0x20000820, 0x00080000, 0x20000000, 0x20080820, 
andre@0: 	0x00000020, 0x00080820, 0x00080800, 0x20000020, 
andre@0: 	0x20080000, 0x20000820, 0x00000820, 0x20080000, 
andre@0: 	0x00080820, 0x00000020, 0x20080020, 0x00080800 
andre@0:     },
andre@0: /* Box S4 */ { 
andre@0: 	0x02008004, 0x00008204, 0x00008204, 0x00000200, 
andre@0: 	0x02008200, 0x02000204, 0x02000004, 0x00008004, 
andre@0: 	0x00000000, 0x02008000, 0x02008000, 0x02008204, 
andre@0: 	0x00000204, 0x00000000, 0x02000200, 0x02000004, 
andre@0: 	0x00000004, 0x00008000, 0x02000000, 0x02008004, 
andre@0: 	0x00000200, 0x02000000, 0x00008004, 0x00008200, 
andre@0: 	0x02000204, 0x00000004, 0x00008200, 0x02000200, 
andre@0: 	0x00008000, 0x02008200, 0x02008204, 0x00000204, 
andre@0: 	0x02000200, 0x02000004, 0x02008000, 0x02008204, 
andre@0: 	0x00000204, 0x00000000, 0x00000000, 0x02008000, 
andre@0: 	0x00008200, 0x02000200, 0x02000204, 0x00000004, 
andre@0: 	0x02008004, 0x00008204, 0x00008204, 0x00000200, 
andre@0: 	0x02008204, 0x00000204, 0x00000004, 0x00008000, 
andre@0: 	0x02000004, 0x00008004, 0x02008200, 0x02000204, 
andre@0: 	0x00008004, 0x00008200, 0x02000000, 0x02008004, 
andre@0: 	0x00000200, 0x02000000, 0x00008000, 0x02008200 
andre@0:     },
andre@0: /* Box S5 */ { 
andre@0: 	0x00000400, 0x08200400, 0x08200000, 0x08000401, 
andre@0: 	0x00200000, 0x00000400, 0x00000001, 0x08200000, 
andre@0: 	0x00200401, 0x00200000, 0x08000400, 0x00200401, 
andre@0: 	0x08000401, 0x08200001, 0x00200400, 0x00000001, 
andre@0: 	0x08000000, 0x00200001, 0x00200001, 0x00000000, 
andre@0: 	0x00000401, 0x08200401, 0x08200401, 0x08000400, 
andre@0: 	0x08200001, 0x00000401, 0x00000000, 0x08000001, 
andre@0: 	0x08200400, 0x08000000, 0x08000001, 0x00200400, 
andre@0: 	0x00200000, 0x08000401, 0x00000400, 0x08000000, 
andre@0: 	0x00000001, 0x08200000, 0x08000401, 0x00200401, 
andre@0: 	0x08000400, 0x00000001, 0x08200001, 0x08200400, 
andre@0: 	0x00200401, 0x00000400, 0x08000000, 0x08200001, 
andre@0: 	0x08200401, 0x00200400, 0x08000001, 0x08200401, 
andre@0: 	0x08200000, 0x00000000, 0x00200001, 0x08000001, 
andre@0: 	0x00200400, 0x08000400, 0x00000401, 0x00200000, 
andre@0: 	0x00000000, 0x00200001, 0x08200400, 0x00000401
andre@0:     },
andre@0: /* Box S6 */ { 
andre@0: 	0x80000040, 0x81000000, 0x00010000, 0x81010040, 
andre@0: 	0x81000000, 0x00000040, 0x81010040, 0x01000000, 
andre@0: 	0x80010000, 0x01010040, 0x01000000, 0x80000040, 
andre@0: 	0x01000040, 0x80010000, 0x80000000, 0x00010040, 
andre@0: 	0x00000000, 0x01000040, 0x80010040, 0x00010000, 
andre@0: 	0x01010000, 0x80010040, 0x00000040, 0x81000040, 
andre@0: 	0x81000040, 0x00000000, 0x01010040, 0x81010000, 
andre@0: 	0x00010040, 0x01010000, 0x81010000, 0x80000000, 
andre@0: 	0x80010000, 0x00000040, 0x81000040, 0x01010000, 
andre@0: 	0x81010040, 0x01000000, 0x00010040, 0x80000040, 
andre@0: 	0x01000000, 0x80010000, 0x80000000, 0x00010040, 
andre@0: 	0x80000040, 0x81010040, 0x01010000, 0x81000000, 
andre@0: 	0x01010040, 0x81010000, 0x00000000, 0x81000040, 
andre@0: 	0x00000040, 0x00010000, 0x81000000, 0x01010040, 
andre@0: 	0x00010000, 0x01000040, 0x80010040, 0x00000000, 
andre@0: 	0x81010000, 0x80000000, 0x01000040, 0x80010040 
andre@0:     },
andre@0: /* Box S7 */ { 
andre@0: 	0x00800000, 0x10800008, 0x10002008, 0x00000000, 
andre@0: 	0x00002000, 0x10002008, 0x00802008, 0x10802000, 
andre@0: 	0x10802008, 0x00800000, 0x00000000, 0x10000008, 
andre@0: 	0x00000008, 0x10000000, 0x10800008, 0x00002008, 
andre@0: 	0x10002000, 0x00802008, 0x00800008, 0x10002000, 
andre@0: 	0x10000008, 0x10800000, 0x10802000, 0x00800008, 
andre@0: 	0x10800000, 0x00002000, 0x00002008, 0x10802008, 
andre@0: 	0x00802000, 0x00000008, 0x10000000, 0x00802000, 
andre@0: 	0x10000000, 0x00802000, 0x00800000, 0x10002008, 
andre@0: 	0x10002008, 0x10800008, 0x10800008, 0x00000008, 
andre@0: 	0x00800008, 0x10000000, 0x10002000, 0x00800000, 
andre@0: 	0x10802000, 0x00002008, 0x00802008, 0x10802000, 
andre@0: 	0x00002008, 0x10000008, 0x10802008, 0x10800000, 
andre@0: 	0x00802000, 0x00000000, 0x00000008, 0x10802008, 
andre@0: 	0x00000000, 0x00802008, 0x10800000, 0x00002000, 
andre@0: 	0x10000008, 0x10002000, 0x00002000, 0x00800008 
andre@0:     },
andre@0: /* Box S8 */ { 
andre@0: 	0x40004100, 0x00004000, 0x00100000, 0x40104100, 
andre@0: 	0x40000000, 0x40004100, 0x00000100, 0x40000000, 
andre@0: 	0x00100100, 0x40100000, 0x40104100, 0x00104000, 
andre@0: 	0x40104000, 0x00104100, 0x00004000, 0x00000100, 
andre@0: 	0x40100000, 0x40000100, 0x40004000, 0x00004100, 
andre@0: 	0x00104000, 0x00100100, 0x40100100, 0x40104000, 
andre@0: 	0x00004100, 0x00000000, 0x00000000, 0x40100100, 
andre@0: 	0x40000100, 0x40004000, 0x00104100, 0x00100000, 
andre@0: 	0x00104100, 0x00100000, 0x40104000, 0x00004000, 
andre@0: 	0x00000100, 0x40100100, 0x00004000, 0x00104100, 
andre@0: 	0x40004000, 0x00000100, 0x40000100, 0x40100000, 
andre@0: 	0x40100100, 0x40000000, 0x00100000, 0x40004100, 
andre@0: 	0x00000000, 0x40104100, 0x00100100, 0x40000100, 
andre@0: 	0x40100000, 0x40004000, 0x40004100, 0x00000000, 
andre@0: 	0x40104100, 0x00104000, 0x00104000, 0x00004100, 
andre@0: 	0x00004100, 0x00100100, 0x40000000, 0x40104000 
andre@0:     }
andre@0: };
andre@0: 
andre@0: static const HALF PC2[8][64] = {
andre@0: /* table 0 */ {
andre@0:     0x00000000, 0x00001000, 0x04000000, 0x04001000, 
andre@0:     0x00100000, 0x00101000, 0x04100000, 0x04101000, 
andre@0:     0x00008000, 0x00009000, 0x04008000, 0x04009000, 
andre@0:     0x00108000, 0x00109000, 0x04108000, 0x04109000, 
andre@0:     0x00000004, 0x00001004, 0x04000004, 0x04001004, 
andre@0:     0x00100004, 0x00101004, 0x04100004, 0x04101004, 
andre@0:     0x00008004, 0x00009004, 0x04008004, 0x04009004, 
andre@0:     0x00108004, 0x00109004, 0x04108004, 0x04109004, 
andre@0:     0x08000000, 0x08001000, 0x0c000000, 0x0c001000, 
andre@0:     0x08100000, 0x08101000, 0x0c100000, 0x0c101000, 
andre@0:     0x08008000, 0x08009000, 0x0c008000, 0x0c009000, 
andre@0:     0x08108000, 0x08109000, 0x0c108000, 0x0c109000, 
andre@0:     0x08000004, 0x08001004, 0x0c000004, 0x0c001004, 
andre@0:     0x08100004, 0x08101004, 0x0c100004, 0x0c101004, 
andre@0:     0x08008004, 0x08009004, 0x0c008004, 0x0c009004, 
andre@0:     0x08108004, 0x08109004, 0x0c108004, 0x0c109004
andre@0:   },
andre@0: /* table 1 */ {
andre@0:     0x00000000, 0x00002000, 0x80000000, 0x80002000, 
andre@0:     0x00000008, 0x00002008, 0x80000008, 0x80002008, 
andre@0:     0x00200000, 0x00202000, 0x80200000, 0x80202000, 
andre@0:     0x00200008, 0x00202008, 0x80200008, 0x80202008, 
andre@0:     0x20000000, 0x20002000, 0xa0000000, 0xa0002000, 
andre@0:     0x20000008, 0x20002008, 0xa0000008, 0xa0002008, 
andre@0:     0x20200000, 0x20202000, 0xa0200000, 0xa0202000, 
andre@0:     0x20200008, 0x20202008, 0xa0200008, 0xa0202008, 
andre@0:     0x00000400, 0x00002400, 0x80000400, 0x80002400, 
andre@0:     0x00000408, 0x00002408, 0x80000408, 0x80002408, 
andre@0:     0x00200400, 0x00202400, 0x80200400, 0x80202400, 
andre@0:     0x00200408, 0x00202408, 0x80200408, 0x80202408, 
andre@0:     0x20000400, 0x20002400, 0xa0000400, 0xa0002400, 
andre@0:     0x20000408, 0x20002408, 0xa0000408, 0xa0002408, 
andre@0:     0x20200400, 0x20202400, 0xa0200400, 0xa0202400, 
andre@0:     0x20200408, 0x20202408, 0xa0200408, 0xa0202408
andre@0:   },
andre@0: /* table 2 */ {
andre@0:     0x00000000, 0x00004000, 0x00000020, 0x00004020, 
andre@0:     0x00080000, 0x00084000, 0x00080020, 0x00084020, 
andre@0:     0x00000800, 0x00004800, 0x00000820, 0x00004820, 
andre@0:     0x00080800, 0x00084800, 0x00080820, 0x00084820, 
andre@0:     0x00000010, 0x00004010, 0x00000030, 0x00004030, 
andre@0:     0x00080010, 0x00084010, 0x00080030, 0x00084030, 
andre@0:     0x00000810, 0x00004810, 0x00000830, 0x00004830, 
andre@0:     0x00080810, 0x00084810, 0x00080830, 0x00084830, 
andre@0:     0x00400000, 0x00404000, 0x00400020, 0x00404020, 
andre@0:     0x00480000, 0x00484000, 0x00480020, 0x00484020, 
andre@0:     0x00400800, 0x00404800, 0x00400820, 0x00404820, 
andre@0:     0x00480800, 0x00484800, 0x00480820, 0x00484820, 
andre@0:     0x00400010, 0x00404010, 0x00400030, 0x00404030, 
andre@0:     0x00480010, 0x00484010, 0x00480030, 0x00484030, 
andre@0:     0x00400810, 0x00404810, 0x00400830, 0x00404830, 
andre@0:     0x00480810, 0x00484810, 0x00480830, 0x00484830 
andre@0:   },
andre@0: /* table 3 */ {
andre@0:     0x00000000, 0x40000000, 0x00000080, 0x40000080, 
andre@0:     0x00040000, 0x40040000, 0x00040080, 0x40040080, 
andre@0:     0x00000040, 0x40000040, 0x000000c0, 0x400000c0, 
andre@0:     0x00040040, 0x40040040, 0x000400c0, 0x400400c0, 
andre@0:     0x10000000, 0x50000000, 0x10000080, 0x50000080, 
andre@0:     0x10040000, 0x50040000, 0x10040080, 0x50040080, 
andre@0:     0x10000040, 0x50000040, 0x100000c0, 0x500000c0, 
andre@0:     0x10040040, 0x50040040, 0x100400c0, 0x500400c0, 
andre@0:     0x00800000, 0x40800000, 0x00800080, 0x40800080, 
andre@0:     0x00840000, 0x40840000, 0x00840080, 0x40840080, 
andre@0:     0x00800040, 0x40800040, 0x008000c0, 0x408000c0, 
andre@0:     0x00840040, 0x40840040, 0x008400c0, 0x408400c0, 
andre@0:     0x10800000, 0x50800000, 0x10800080, 0x50800080, 
andre@0:     0x10840000, 0x50840000, 0x10840080, 0x50840080, 
andre@0:     0x10800040, 0x50800040, 0x108000c0, 0x508000c0, 
andre@0:     0x10840040, 0x50840040, 0x108400c0, 0x508400c0 
andre@0:   },
andre@0: /* table 4 */ {
andre@0:     0x00000000, 0x00000008, 0x08000000, 0x08000008, 
andre@0:     0x00040000, 0x00040008, 0x08040000, 0x08040008, 
andre@0:     0x00002000, 0x00002008, 0x08002000, 0x08002008, 
andre@0:     0x00042000, 0x00042008, 0x08042000, 0x08042008, 
andre@0:     0x80000000, 0x80000008, 0x88000000, 0x88000008, 
andre@0:     0x80040000, 0x80040008, 0x88040000, 0x88040008, 
andre@0:     0x80002000, 0x80002008, 0x88002000, 0x88002008, 
andre@0:     0x80042000, 0x80042008, 0x88042000, 0x88042008, 
andre@0:     0x00080000, 0x00080008, 0x08080000, 0x08080008, 
andre@0:     0x000c0000, 0x000c0008, 0x080c0000, 0x080c0008, 
andre@0:     0x00082000, 0x00082008, 0x08082000, 0x08082008, 
andre@0:     0x000c2000, 0x000c2008, 0x080c2000, 0x080c2008, 
andre@0:     0x80080000, 0x80080008, 0x88080000, 0x88080008, 
andre@0:     0x800c0000, 0x800c0008, 0x880c0000, 0x880c0008, 
andre@0:     0x80082000, 0x80082008, 0x88082000, 0x88082008, 
andre@0:     0x800c2000, 0x800c2008, 0x880c2000, 0x880c2008 
andre@0:   },
andre@0: /* table 5 */ {
andre@0:     0x00000000, 0x00400000, 0x00008000, 0x00408000, 
andre@0:     0x40000000, 0x40400000, 0x40008000, 0x40408000, 
andre@0:     0x00000020, 0x00400020, 0x00008020, 0x00408020, 
andre@0:     0x40000020, 0x40400020, 0x40008020, 0x40408020, 
andre@0:     0x00001000, 0x00401000, 0x00009000, 0x00409000, 
andre@0:     0x40001000, 0x40401000, 0x40009000, 0x40409000, 
andre@0:     0x00001020, 0x00401020, 0x00009020, 0x00409020, 
andre@0:     0x40001020, 0x40401020, 0x40009020, 0x40409020, 
andre@0:     0x00100000, 0x00500000, 0x00108000, 0x00508000, 
andre@0:     0x40100000, 0x40500000, 0x40108000, 0x40508000, 
andre@0:     0x00100020, 0x00500020, 0x00108020, 0x00508020, 
andre@0:     0x40100020, 0x40500020, 0x40108020, 0x40508020, 
andre@0:     0x00101000, 0x00501000, 0x00109000, 0x00509000, 
andre@0:     0x40101000, 0x40501000, 0x40109000, 0x40509000, 
andre@0:     0x00101020, 0x00501020, 0x00109020, 0x00509020, 
andre@0:     0x40101020, 0x40501020, 0x40109020, 0x40509020 
andre@0:   },
andre@0: /* table 6 */ {
andre@0:     0x00000000, 0x00000040, 0x04000000, 0x04000040, 
andre@0:     0x00000800, 0x00000840, 0x04000800, 0x04000840, 
andre@0:     0x00800000, 0x00800040, 0x04800000, 0x04800040, 
andre@0:     0x00800800, 0x00800840, 0x04800800, 0x04800840, 
andre@0:     0x10000000, 0x10000040, 0x14000000, 0x14000040, 
andre@0:     0x10000800, 0x10000840, 0x14000800, 0x14000840, 
andre@0:     0x10800000, 0x10800040, 0x14800000, 0x14800040, 
andre@0:     0x10800800, 0x10800840, 0x14800800, 0x14800840, 
andre@0:     0x00000080, 0x000000c0, 0x04000080, 0x040000c0, 
andre@0:     0x00000880, 0x000008c0, 0x04000880, 0x040008c0, 
andre@0:     0x00800080, 0x008000c0, 0x04800080, 0x048000c0, 
andre@0:     0x00800880, 0x008008c0, 0x04800880, 0x048008c0, 
andre@0:     0x10000080, 0x100000c0, 0x14000080, 0x140000c0, 
andre@0:     0x10000880, 0x100008c0, 0x14000880, 0x140008c0, 
andre@0:     0x10800080, 0x108000c0, 0x14800080, 0x148000c0, 
andre@0:     0x10800880, 0x108008c0, 0x14800880, 0x148008c0 
andre@0:   },
andre@0: /* table 7 */ {
andre@0:     0x00000000, 0x00000010, 0x00000400, 0x00000410, 
andre@0:     0x00000004, 0x00000014, 0x00000404, 0x00000414, 
andre@0:     0x00004000, 0x00004010, 0x00004400, 0x00004410, 
andre@0:     0x00004004, 0x00004014, 0x00004404, 0x00004414, 
andre@0:     0x20000000, 0x20000010, 0x20000400, 0x20000410, 
andre@0:     0x20000004, 0x20000014, 0x20000404, 0x20000414, 
andre@0:     0x20004000, 0x20004010, 0x20004400, 0x20004410, 
andre@0:     0x20004004, 0x20004014, 0x20004404, 0x20004414, 
andre@0:     0x00200000, 0x00200010, 0x00200400, 0x00200410, 
andre@0:     0x00200004, 0x00200014, 0x00200404, 0x00200414, 
andre@0:     0x00204000, 0x00204010, 0x00204400, 0x00204410, 
andre@0:     0x00204004, 0x00204014, 0x00204404, 0x00204414, 
andre@0:     0x20200000, 0x20200010, 0x20200400, 0x20200410, 
andre@0:     0x20200004, 0x20200014, 0x20200404, 0x20200414, 
andre@0:     0x20204000, 0x20204010, 0x20204400, 0x20204410, 
andre@0:     0x20204004, 0x20204014, 0x20204404, 0x20204414 
andre@0:   }
andre@0: };
andre@0: 
andre@0: /*
andre@0:  * The PC-1 Permutation
andre@0:  * If we number the bits of the 8 bytes of key input like this (in octal):
andre@0:  *     00 01 02 03 04 05 06 07 
andre@0:  *     10 11 12 13 14 15 16 17 
andre@0:  *     20 21 22 23 24 25 26 27 
andre@0:  *     30 31 32 33 34 35 36 37 
andre@0:  *     40 41 42 43 44 45 46 47 
andre@0:  *     50 51 52 53 54 55 56 57 
andre@0:  *     60 61 62 63 64 65 66 67 
andre@0:  *     70 71 72 73 74 75 76 77 
andre@0:  * then after the PC-1 permutation, 
andre@0:  * C0 is
andre@0:  *     70 60 50 40 30 20 10 00 
andre@0:  *     71 61 51 41 31 21 11 01 
andre@0:  *     72 62 52 42 32 22 12 02 
andre@0:  *     73 63 53 43 
andre@0:  * D0 is
andre@0:  *     76 66 56 46 36 26 16 06 
andre@0:  *     75 65 55 45 35 25 15 05 
andre@0:  *     74 64 54 44 34 24 14 04 
andre@0:  *                 33 23 13 03 
andre@0:  * and these parity bits have been discarded:
andre@0:  *     77 67 57 47 37 27 17 07 
andre@0:  * 
andre@0:  * We achieve this by flipping the input matrix about the diagonal from 70-07,
andre@0:  * getting left = 
andre@0:  *     77 67 57 47 37 27 17 07 	(these are the parity bits)
andre@0:  *     76 66 56 46 36 26 16 06 
andre@0:  *     75 65 55 45 35 25 15 05 
andre@0:  *     74 64 54 44 34 24 14 04 
andre@0:  * right = 
andre@0:  *     73 63 53 43 33 23 13 03 
andre@0:  *     72 62 52 42 32 22 12 02 
andre@0:  *     71 61 51 41 31 21 11 01 
andre@0:  *     70 60 50 40 30 20 10 00 
andre@0:  * then byte swap right, ala htonl() on a little endian machine.
andre@0:  * right = 
andre@0:  *     70 60 50 40 30 20 10 00 
andre@0:  *     71 67 57 47 37 27 11 07 
andre@0:  *     72 62 52 42 32 22 12 02 
andre@0:  *     73 63 53 43 33 23 13 03 
andre@0:  * then
andre@0:  *     c0 = right >> 4;
andre@0:  *     d0 = ((left & 0x00ffffff) << 4) | (right & 0xf);
andre@0: */
andre@0: 
andre@0: #define FLIP_RIGHT_DIAGONAL(word, temp) \
andre@0:     temp  = (word ^ (word >> 18)) & 0x00003333; \
andre@0:     word ^=  temp | (temp << 18); \
andre@0:     temp  = (word ^ (word >> 9)) & 0x00550055; \
andre@0:     word ^=  temp | (temp << 9);
andre@0: 
andre@0: #if defined(__GNUC__) && defined(NSS_X86_OR_X64)
andre@0: #define BYTESWAP(word, temp) \
andre@0:     __asm("bswap	%0" : "+r" (word));
andre@0: #elif (_MSC_VER >= 1300) && defined(NSS_X86_OR_X64)
andre@0: #include <stdlib.h>
andre@0: #pragma intrinsic(_byteswap_ulong)
andre@0: #define BYTESWAP(word, temp) \
andre@0:     word = _byteswap_ulong(word);
andre@0: #elif defined(__GNUC__) && (defined(__thumb2__) || \
andre@0:       (!defined(__thumb__) && \
andre@0:       (defined(__ARM_ARCH_6__) || \
andre@0:        defined(__ARM_ARCH_6J__) || \
andre@0:        defined(__ARM_ARCH_6K__) || \
andre@0:        defined(__ARM_ARCH_6Z__) || \
andre@0:        defined(__ARM_ARCH_6ZK__) || \
andre@0:        defined(__ARM_ARCH_6T2__) || \
andre@0:        defined(__ARM_ARCH_7__) || \
andre@0:        defined(__ARM_ARCH_7A__) || \
andre@0:        defined(__ARM_ARCH_7R__))))
andre@0: #define BYTESWAP(word, temp) \
andre@0:     __asm("rev %0, %0" : "+r" (word));
andre@0: #else
andre@0: #define BYTESWAP(word, temp) \
andre@0:     word = (word >> 16) | (word << 16); \
andre@0:     temp = 0x00ff00ff; \
andre@0:     word = ((word & temp) << 8) | ((word >> 8) & temp); 
andre@0: #endif
andre@0: 
andre@0: #define PC1(left, right, c0, d0, temp) \
andre@0:     right ^= temp = ((left >> 4) ^ right) & 0x0f0f0f0f; \
andre@0:     left  ^= temp << 4; \
andre@0:     FLIP_RIGHT_DIAGONAL(left, temp); \
andre@0:     FLIP_RIGHT_DIAGONAL(right, temp); \
andre@0:     BYTESWAP(right, temp); \
andre@0:     c0 = right >> 4; \
andre@0:     d0 = ((left & 0x00ffffff) << 4) | (right & 0xf); 
andre@0: 
andre@0: #define LEFT_SHIFT_1( reg ) (((reg << 1) | (reg >> 27)) & 0x0FFFFFFF)
andre@0: #define LEFT_SHIFT_2( reg ) (((reg << 2) | (reg >> 26)) & 0x0FFFFFFF)
andre@0: 
andre@0: /*
andre@0:  *   setup key schedules from key
andre@0:  */
andre@0: 
andre@0: void 
andre@0: DES_MakeSchedule( HALF * ks, const BYTE * key,   DESDirection direction)
andre@0: {
andre@0:     register HALF left, right;
andre@0:     register HALF c0, d0;
andre@0:     register HALF temp;
andre@0:     int           delta;
andre@0:     unsigned int  ls;
andre@0: 
andre@0: #if defined(NSS_X86_OR_X64)
andre@0:     left  = HALFPTR(key)[0]; 
andre@0:     right = HALFPTR(key)[1]; 
andre@0:     BYTESWAP(left, temp);
andre@0:     BYTESWAP(right, temp);
andre@0: #else
andre@0:     if (((ptrdiff_t)key & 0x03) == 0) {
andre@0: 	left  = HALFPTR(key)[0]; 
andre@0: 	right = HALFPTR(key)[1]; 
andre@0: #if defined(IS_LITTLE_ENDIAN)
andre@0: 	BYTESWAP(left, temp);
andre@0: 	BYTESWAP(right, temp);
andre@0: #endif
andre@0:     } else {
andre@0: 	left    = ((HALF)key[0] << 24) | ((HALF)key[1] << 16) | 
andre@0: 		  ((HALF)key[2] << 8)  | key[3];
andre@0: 	right   = ((HALF)key[4] << 24) | ((HALF)key[5] << 16) | 
andre@0: 		  ((HALF)key[6] << 8)  | key[7];
andre@0:     }
andre@0: #endif
andre@0: 
andre@0:     PC1(left, right, c0, d0, temp);
andre@0: 
andre@0:     if (direction == DES_ENCRYPT) {
andre@0: 	delta = 2 * (int)sizeof(HALF);
andre@0:     } else {
andre@0: 	ks += 30;
andre@0: 	delta = (-2) * (int)sizeof(HALF);
andre@0:     }
andre@0: 
andre@0:     for (ls = 0x8103; ls; ls >>= 1) {
andre@0: 	if ( ls & 1 ) {
andre@0: 	    c0 = LEFT_SHIFT_1( c0 );
andre@0: 	    d0 = LEFT_SHIFT_1( d0 );
andre@0: 	} else {
andre@0: 	    c0 = LEFT_SHIFT_2( c0 );
andre@0: 	    d0 = LEFT_SHIFT_2( d0 );
andre@0: 	}
andre@0: 
andre@0: #ifdef USE_INDEXING
andre@0: #define PC2LOOKUP(b,c) PC2[b][c]
andre@0: 
andre@0: 	left   = PC2LOOKUP(0, ((c0 >> 22) & 0x3F) );
andre@0: 	left  |= PC2LOOKUP(1, ((c0 >> 13) & 0x3F) );
andre@0: 	left  |= PC2LOOKUP(2, ((c0 >>  4) & 0x38) | (c0 & 0x7) );
andre@0: 	left  |= PC2LOOKUP(3, ((c0>>18)&0xC) | ((c0>>11)&0x3) | (c0&0x30));
andre@0: 
andre@0: 	right  = PC2LOOKUP(4, ((d0 >> 22) & 0x3F) );
andre@0: 	right |= PC2LOOKUP(5, ((d0 >> 15) & 0x30) | ((d0 >> 14) & 0xf) );
andre@0: 	right |= PC2LOOKUP(6, ((d0 >>  7) & 0x3F) );
andre@0: 	right |= PC2LOOKUP(7, ((d0 >>  1) & 0x3C) | (d0 & 0x3));
andre@0: #else
andre@0: #define PC2LOOKUP(b,c) *(HALF *)((BYTE *)&PC2[b][0]+(c))
andre@0: 
andre@0: 	left   = PC2LOOKUP(0, ((c0 >> 20) & 0xFC) );
andre@0: 	left  |= PC2LOOKUP(1, ((c0 >> 11) & 0xFC) );
andre@0: 	left  |= PC2LOOKUP(2, ((c0 >>  2) & 0xE0) | ((c0 <<  2) & 0x1C) );
andre@0: 	left  |= PC2LOOKUP(3, ((c0>>16)&0x30)|((c0>>9)&0xC)|((c0<<2)&0xC0));
andre@0: 
andre@0: 	right  = PC2LOOKUP(4, ((d0 >> 20) & 0xFC) );
andre@0: 	right |= PC2LOOKUP(5, ((d0 >> 13) & 0xC0) | ((d0 >> 12) & 0x3C) );
andre@0: 	right |= PC2LOOKUP(6, ((d0 >>  5) & 0xFC) );
andre@0: 	right |= PC2LOOKUP(7, ((d0 <<  1) & 0xF0) | ((d0 << 2) & 0x0C));
andre@0: #endif
andre@0: 	/* left  contains key bits for S1 S3 S2 S4 */
andre@0: 	/* right contains key bits for S6 S8 S5 S7 */
andre@0: 	temp = (left  << 16)        /* S2 S4 XX XX */
andre@0: 	     | (right >> 16);       /* XX XX S6 S8 */
andre@0: 	ks[0] = temp;
andre@0: 
andre@0: 	temp = (left  & 0xffff0000) /* S1 S3 XX XX */
andre@0: 	     | (right & 0x0000ffff);/* XX XX S5 S7 */
andre@0: 	ks[1] = temp;
andre@0: 
andre@0: 	ks = (HALF*)((BYTE *)ks + delta);
andre@0:     }
andre@0: }
andre@0: 
andre@0: /*
andre@0:  * The DES Initial Permutation
andre@0:  * if we number the bits of the 8 bytes of input like this (in octal):
andre@0:  *     00 01 02 03 04 05 06 07 
andre@0:  *     10 11 12 13 14 15 16 17 
andre@0:  *     20 21 22 23 24 25 26 27 
andre@0:  *     30 31 32 33 34 35 36 37 
andre@0:  *     40 41 42 43 44 45 46 47 
andre@0:  *     50 51 52 53 54 55 56 57 
andre@0:  *     60 61 62 63 64 65 66 67 
andre@0:  *     70 71 72 73 74 75 76 77 
andre@0:  * then after the initial permutation, they will be in this order. 
andre@0:  *     71 61 51 41 31 21 11 01 
andre@0:  *     73 63 53 43 33 23 13 03 
andre@0:  *     75 65 55 45 35 25 15 05 
andre@0:  *     77 67 57 47 37 27 17 07 
andre@0:  *     70 60 50 40 30 20 10 00 
andre@0:  *     72 62 52 42 32 22 12 02 
andre@0:  *     74 64 54 44 34 24 14 04 
andre@0:  *     76 66 56 46 36 26 16 06 
andre@0:  *
andre@0:  * One way to do this is in two steps:
andre@0:  * 1. Flip this matrix about the diagonal from 70-07 as done for PC1.
andre@0:  * 2. Rearrange the bytes (rows in the matrix above) with the following code.
andre@0:  *
andre@0:  * #define swapHiLo(word, temp) \
andre@0:  *   temp  = (word ^ (word >> 24)) & 0x000000ff; \
andre@0:  *   word ^=  temp | (temp << 24); 
andre@0:  *
andre@0:  *   right ^= temp = ((left << 8) ^ right) & 0xff00ff00; 
andre@0:  *   left  ^= temp >> 8; 
andre@0:  *   swapHiLo(left, temp);
andre@0:  *   swapHiLo(right,temp);
andre@0:  *
andre@0:  * However, the two steps can be combined, so that the rows are rearranged
andre@0:  * while the matrix is being flipped, reducing the number of bit exchange
andre@0:  * operations from 8 ot 5.  
andre@0:  *
andre@0:  * Initial Permutation */
andre@0: #define IP(left, right, temp) \
andre@0:     right ^= temp = ((left >> 4) ^  right) & 0x0f0f0f0f; \
andre@0:     left  ^= temp << 4; \
andre@0:     right ^= temp = ((left >> 16) ^ right) & 0x0000ffff; \
andre@0:     left  ^= temp << 16; \
andre@0:     right ^= temp = ((left << 2) ^ right) & 0xcccccccc; \
andre@0:     left  ^= temp >> 2; \
andre@0:     right ^= temp = ((left << 8) ^ right) & 0xff00ff00; \
andre@0:     left  ^= temp >> 8; \
andre@0:     right ^= temp = ((left >> 1) ^ right) & 0x55555555; \
andre@0:     left  ^= temp << 1; 
andre@0: 
andre@0: /* The Final (Inverse Initial) permutation is done by reversing the 
andre@0: ** steps of the Initital Permutation 
andre@0: */
andre@0: 
andre@0: #define FP(left, right, temp) \
andre@0:     right ^= temp = ((left >> 1) ^ right) & 0x55555555; \
andre@0:     left  ^= temp << 1; \
andre@0:     right ^= temp = ((left << 8) ^ right) & 0xff00ff00; \
andre@0:     left  ^= temp >> 8; \
andre@0:     right ^= temp = ((left << 2) ^ right) & 0xcccccccc; \
andre@0:     left  ^= temp >> 2; \
andre@0:     right ^= temp = ((left >> 16) ^ right) & 0x0000ffff; \
andre@0:     left  ^= temp << 16; \
andre@0:     right ^= temp = ((left >> 4) ^  right) & 0x0f0f0f0f; \
andre@0:     left  ^= temp << 4; 
andre@0: 
andre@0: void 
andre@0: DES_Do1Block(HALF * ks, const BYTE * inbuf, BYTE * outbuf)
andre@0: {
andre@0:     register HALF left, right;
andre@0:     register HALF temp;
andre@0: 
andre@0: #if defined(NSS_X86_OR_X64)
andre@0:     left  = HALFPTR(inbuf)[0]; 
andre@0:     right = HALFPTR(inbuf)[1]; 
andre@0:     BYTESWAP(left, temp);
andre@0:     BYTESWAP(right, temp);
andre@0: #else
andre@0:     if (((ptrdiff_t)inbuf & 0x03) == 0) {
andre@0: 	left  = HALFPTR(inbuf)[0]; 
andre@0: 	right = HALFPTR(inbuf)[1]; 
andre@0: #if defined(IS_LITTLE_ENDIAN)
andre@0: 	BYTESWAP(left, temp);
andre@0: 	BYTESWAP(right, temp);
andre@0: #endif
andre@0:     } else {
andre@0: 	left    = ((HALF)inbuf[0] << 24) | ((HALF)inbuf[1] << 16) | 
andre@0: 		  ((HALF)inbuf[2] << 8)  | inbuf[3];
andre@0: 	right   = ((HALF)inbuf[4] << 24) | ((HALF)inbuf[5] << 16) | 
andre@0: 		  ((HALF)inbuf[6] << 8)  | inbuf[7];
andre@0:     }
andre@0: #endif
andre@0: 
andre@0:     IP(left, right, temp);
andre@0: 
andre@0:     /* shift the values left circularly 3 bits. */
andre@0:     left  = (left  << 3) | (left  >> 29);
andre@0:     right = (right << 3) | (right >> 29);
andre@0: 
andre@0: #ifdef USE_INDEXING
andre@0: #define KSLOOKUP(s,b) SP[s][((temp >> (b+2)) & 0x3f)]
andre@0: #else
andre@0: #define KSLOOKUP(s,b) *(HALF*)((BYTE*)&SP[s][0]+((temp >> b) & 0xFC))
andre@0: #endif
andre@0: #define ROUND(out, in, r) \
andre@0:     temp  = in ^ ks[2*r]; \
andre@0:     out ^= KSLOOKUP( 1,  24 ); \
andre@0:     out ^= KSLOOKUP( 3,  16 ); \
andre@0:     out ^= KSLOOKUP( 5,   8 ); \
andre@0:     out ^= KSLOOKUP( 7,   0 ); \
andre@0:     temp  = ((in >> 4) | (in << 28)) ^ ks[2*r+1]; \
andre@0:     out ^= KSLOOKUP( 0,  24 ); \
andre@0:     out ^= KSLOOKUP( 2,  16 ); \
andre@0:     out ^= KSLOOKUP( 4,   8 ); \
andre@0:     out ^= KSLOOKUP( 6,   0 ); 
andre@0: 
andre@0:     /* Do the 16 Feistel rounds */
andre@0:     ROUND(left, right, 0)
andre@0:     ROUND(right, left, 1)
andre@0:     ROUND(left, right, 2)
andre@0:     ROUND(right, left, 3)
andre@0:     ROUND(left, right, 4)
andre@0:     ROUND(right, left, 5)
andre@0:     ROUND(left, right, 6)
andre@0:     ROUND(right, left, 7)
andre@0:     ROUND(left, right, 8)
andre@0:     ROUND(right, left, 9)
andre@0:     ROUND(left, right, 10)
andre@0:     ROUND(right, left, 11)
andre@0:     ROUND(left, right, 12)
andre@0:     ROUND(right, left, 13)
andre@0:     ROUND(left, right, 14)
andre@0:     ROUND(right, left, 15)
andre@0: 
andre@0:     /* now shift circularly right 3 bits to undo the shifting done 
andre@0:     ** above.  switch left and right here. 
andre@0:     */
andre@0:     temp  = (left >> 3) | (left << 29); 
andre@0:     left  = (right >> 3) | (right << 29); 
andre@0:     right = temp;
andre@0: 
andre@0:     FP(left, right, temp);
andre@0: 
andre@0: #if defined(NSS_X86_OR_X64)
andre@0:     BYTESWAP(left, temp);
andre@0:     BYTESWAP(right, temp);
andre@0:     HALFPTR(outbuf)[0]  = left; 
andre@0:     HALFPTR(outbuf)[1]  = right; 
andre@0: #else
andre@0:     if (((ptrdiff_t)outbuf & 0x03) == 0) {
andre@0: #if defined(IS_LITTLE_ENDIAN)
andre@0: 	BYTESWAP(left, temp);
andre@0: 	BYTESWAP(right, temp);
andre@0: #endif
andre@0: 	HALFPTR(outbuf)[0]  = left; 
andre@0: 	HALFPTR(outbuf)[1]  = right; 
andre@0:     } else {
andre@0: 	outbuf[0] = (BYTE)(left >> 24);
andre@0: 	outbuf[1] = (BYTE)(left >> 16);
andre@0: 	outbuf[2] = (BYTE)(left >>  8);
andre@0: 	outbuf[3] = (BYTE)(left      );
andre@0: 
andre@0: 	outbuf[4] = (BYTE)(right >> 24);
andre@0: 	outbuf[5] = (BYTE)(right >> 16);
andre@0: 	outbuf[6] = (BYTE)(right >>  8);
andre@0: 	outbuf[7] = (BYTE)(right      );
andre@0:     }
andre@0: #endif
andre@0: 
andre@0: }
andre@0: 
andre@0: /* Ackowledgements:
andre@0: ** Two ideas used in this implementation were shown to me by Dennis Ferguson 
andre@0: ** in 1990.  He credits them to Richard Outerbridge and Dan Hoey.  They were:
andre@0: ** 1. The method of computing the Initial and Final permutations.
andre@0: ** 2. Circularly rotating the SP tables and the initial values of left and 
andre@0: **	right to reduce the number of shifts required during the 16 rounds.
andre@0: */