1/*************************************************************************** 2* Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de> * 3* * 4* This program is free software; you can redistribute it and/or modify * 5* it under the terms of the GNU General Public License as published by * 6* the Free Software Foundation; either version 2 of the License, or * 7* (at your option) any later version. * 8* * 9* This program is distributed in the hope that it will be useful, * 10* but WITHOUT ANY WARRANTY; without even the implied warranty of * 11* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 12* GNU General Public License for more details. * 13* * 14* You should have received a copy of the GNU General Public License * 15* along with this program; if not, write to the * 16* Free Software Foundation, Inc., * 17* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * 18***************************************************************************/ 19 20.file "twofish-i586-asm.S" 21.text 22 23#include <asm/asm-offsets.h> 24 25/* return adress at 0 */ 26 27#define in_blk 12 /* input byte array address parameter*/ 28#define out_blk 8 /* output byte array address parameter*/ 29#define tfm 4 /* Twofish context structure */ 30 31#define a_offset 0 32#define b_offset 4 33#define c_offset 8 34#define d_offset 12 35 36/* Structure of the crypto context struct*/ 37 38#define s0 0 /* S0 Array 256 Words each */ 39#define s1 1024 /* S1 Array */ 40#define s2 2048 /* S2 Array */ 41#define s3 3072 /* S3 Array */ 42#define w 4096 /* 8 whitening keys (word) */ 43#define k 4128 /* key 1-32 ( word ) */ 44 45/* define a few register aliases to allow macro substitution */ 46 47#define R0D %eax 48#define R0B %al 49#define R0H %ah 50 51#define R1D %ebx 52#define R1B %bl 53#define R1H %bh 54 55#define R2D %ecx 56#define R2B %cl 57#define R2H %ch 58 59#define R3D %edx 60#define R3B %dl 61#define R3H %dh 62 63 64/* performs input whitening */ 65#define input_whitening(src,context,offset)\ 66 xor w+offset(context), src; 67 68/* performs input whitening */ 69#define output_whitening(src,context,offset)\ 70 xor w+16+offset(context), src; 71 72/* 73 * a input register containing a (rotated 16) 74 * b input register containing b 75 * c input register containing c 76 * d input register containing d (already rol $1) 77 * operations on a and b are interleaved to increase performance 78 */ 79#define encrypt_round(a,b,c,d,round)\ 80 push d ## D;\ 81 movzx b ## B, %edi;\ 82 mov s1(%ebp,%edi,4),d ## D;\ 83 movzx a ## B, %edi;\ 84 mov s2(%ebp,%edi,4),%esi;\ 85 movzx b ## H, %edi;\ 86 ror $16, b ## D;\ 87 xor s2(%ebp,%edi,4),d ## D;\ 88 movzx a ## H, %edi;\ 89 ror $16, a ## D;\ 90 xor s3(%ebp,%edi,4),%esi;\ 91 movzx b ## B, %edi;\ 92 xor s3(%ebp,%edi,4),d ## D;\ 93 movzx a ## B, %edi;\ 94 xor (%ebp,%edi,4), %esi;\ 95 movzx b ## H, %edi;\ 96 ror $15, b ## D;\ 97 xor (%ebp,%edi,4), d ## D;\ 98 movzx a ## H, %edi;\ 99 xor s1(%ebp,%edi,4),%esi;\ 100 pop %edi;\ 101 add d ## D, %esi;\ 102 add %esi, d ## D;\ 103 add k+round(%ebp), %esi;\ 104 xor %esi, c ## D;\ 105 rol $15, c ## D;\ 106 add k+4+round(%ebp),d ## D;\ 107 xor %edi, d ## D; 108 109/* 110 * a input register containing a (rotated 16) 111 * b input register containing b 112 * c input register containing c 113 * d input register containing d (already rol $1) 114 * operations on a and b are interleaved to increase performance 115 * last round has different rotations for the output preparation 116 */ 117#define encrypt_last_round(a,b,c,d,round)\ 118 push d ## D;\ 119 movzx b ## B, %edi;\ 120 mov s1(%ebp,%edi,4),d ## D;\ 121 movzx a ## B, %edi;\ 122 mov s2(%ebp,%edi,4),%esi;\ 123 movzx b ## H, %edi;\ 124 ror $16, b ## D;\ 125 xor s2(%ebp,%edi,4),d ## D;\ 126 movzx a ## H, %edi;\ 127 ror $16, a ## D;\ 128 xor s3(%ebp,%edi,4),%esi;\ 129 movzx b ## B, %edi;\ 130 xor s3(%ebp,%edi,4),d ## D;\ 131 movzx a ## B, %edi;\ 132 xor (%ebp,%edi,4), %esi;\ 133 movzx b ## H, %edi;\ 134 ror $16, b ## D;\ 135 xor (%ebp,%edi,4), d ## D;\ 136 movzx a ## H, %edi;\ 137 xor s1(%ebp,%edi,4),%esi;\ 138 pop %edi;\ 139 add d ## D, %esi;\ 140 add %esi, d ## D;\ 141 add k+round(%ebp), %esi;\ 142 xor %esi, c ## D;\ 143 ror $1, c ## D;\ 144 add k+4+round(%ebp),d ## D;\ 145 xor %edi, d ## D; 146 147/* 148 * a input register containing a 149 * b input register containing b (rotated 16) 150 * c input register containing c 151 * d input register containing d (already rol $1) 152 * operations on a and b are interleaved to increase performance 153 */ 154#define decrypt_round(a,b,c,d,round)\ 155 push c ## D;\ 156 movzx a ## B, %edi;\ 157 mov (%ebp,%edi,4), c ## D;\ 158 movzx b ## B, %edi;\ 159 mov s3(%ebp,%edi,4),%esi;\ 160 movzx a ## H, %edi;\ 161 ror $16, a ## D;\ 162 xor s1(%ebp,%edi,4),c ## D;\ 163 movzx b ## H, %edi;\ 164 ror $16, b ## D;\ 165 xor (%ebp,%edi,4), %esi;\ 166 movzx a ## B, %edi;\ 167 xor s2(%ebp,%edi,4),c ## D;\ 168 movzx b ## B, %edi;\ 169 xor s1(%ebp,%edi,4),%esi;\ 170 movzx a ## H, %edi;\ 171 ror $15, a ## D;\ 172 xor s3(%ebp,%edi,4),c ## D;\ 173 movzx b ## H, %edi;\ 174 xor s2(%ebp,%edi,4),%esi;\ 175 pop %edi;\ 176 add %esi, c ## D;\ 177 add c ## D, %esi;\ 178 add k+round(%ebp), c ## D;\ 179 xor %edi, c ## D;\ 180 add k+4+round(%ebp),%esi;\ 181 xor %esi, d ## D;\ 182 rol $15, d ## D; 183 184/* 185 * a input register containing a 186 * b input register containing b (rotated 16) 187 * c input register containing c 188 * d input register containing d (already rol $1) 189 * operations on a and b are interleaved to increase performance 190 * last round has different rotations for the output preparation 191 */ 192#define decrypt_last_round(a,b,c,d,round)\ 193 push c ## D;\ 194 movzx a ## B, %edi;\ 195 mov (%ebp,%edi,4), c ## D;\ 196 movzx b ## B, %edi;\ 197 mov s3(%ebp,%edi,4),%esi;\ 198 movzx a ## H, %edi;\ 199 ror $16, a ## D;\ 200 xor s1(%ebp,%edi,4),c ## D;\ 201 movzx b ## H, %edi;\ 202 ror $16, b ## D;\ 203 xor (%ebp,%edi,4), %esi;\ 204 movzx a ## B, %edi;\ 205 xor s2(%ebp,%edi,4),c ## D;\ 206 movzx b ## B, %edi;\ 207 xor s1(%ebp,%edi,4),%esi;\ 208 movzx a ## H, %edi;\ 209 ror $16, a ## D;\ 210 xor s3(%ebp,%edi,4),c ## D;\ 211 movzx b ## H, %edi;\ 212 xor s2(%ebp,%edi,4),%esi;\ 213 pop %edi;\ 214 add %esi, c ## D;\ 215 add c ## D, %esi;\ 216 add k+round(%ebp), c ## D;\ 217 xor %edi, c ## D;\ 218 add k+4+round(%ebp),%esi;\ 219 xor %esi, d ## D;\ 220 ror $1, d ## D; 221 222.align 4 223.global twofish_enc_blk 224.global twofish_dec_blk 225 226twofish_enc_blk: 227 push %ebp /* save registers according to calling convention*/ 228 push %ebx 229 push %esi 230 push %edi 231 232 mov tfm + 16(%esp), %ebp /* abuse the base pointer: set new base bointer to the crypto tfm */ 233 add $crypto_tfm_ctx_offset, %ebp /* ctx adress */ 234 mov in_blk+16(%esp),%edi /* input adress in edi */ 235 236 mov (%edi), %eax 237 mov b_offset(%edi), %ebx 238 mov c_offset(%edi), %ecx 239 mov d_offset(%edi), %edx 240 input_whitening(%eax,%ebp,a_offset) 241 ror $16, %eax 242 input_whitening(%ebx,%ebp,b_offset) 243 input_whitening(%ecx,%ebp,c_offset) 244 input_whitening(%edx,%ebp,d_offset) 245 rol $1, %edx 246 247 encrypt_round(R0,R1,R2,R3,0); 248 encrypt_round(R2,R3,R0,R1,8); 249 encrypt_round(R0,R1,R2,R3,2*8); 250 encrypt_round(R2,R3,R0,R1,3*8); 251 encrypt_round(R0,R1,R2,R3,4*8); 252 encrypt_round(R2,R3,R0,R1,5*8); 253 encrypt_round(R0,R1,R2,R3,6*8); 254 encrypt_round(R2,R3,R0,R1,7*8); 255 encrypt_round(R0,R1,R2,R3,8*8); 256 encrypt_round(R2,R3,R0,R1,9*8); 257 encrypt_round(R0,R1,R2,R3,10*8); 258 encrypt_round(R2,R3,R0,R1,11*8); 259 encrypt_round(R0,R1,R2,R3,12*8); 260 encrypt_round(R2,R3,R0,R1,13*8); 261 encrypt_round(R0,R1,R2,R3,14*8); 262 encrypt_last_round(R2,R3,R0,R1,15*8); 263 264 output_whitening(%eax,%ebp,c_offset) 265 output_whitening(%ebx,%ebp,d_offset) 266 output_whitening(%ecx,%ebp,a_offset) 267 output_whitening(%edx,%ebp,b_offset) 268 mov out_blk+16(%esp),%edi; 269 mov %eax, c_offset(%edi) 270 mov %ebx, d_offset(%edi) 271 mov %ecx, (%edi) 272 mov %edx, b_offset(%edi) 273 274 pop %edi 275 pop %esi 276 pop %ebx 277 pop %ebp 278 mov $1, %eax 279 ret 280 281twofish_dec_blk: 282 push %ebp /* save registers according to calling convention*/ 283 push %ebx 284 push %esi 285 push %edi 286 287 288 mov tfm + 16(%esp), %ebp /* abuse the base pointer: set new base bointer to the crypto tfm */ 289 add $crypto_tfm_ctx_offset, %ebp /* ctx adress */ 290 mov in_blk+16(%esp),%edi /* input adress in edi */ 291 292 mov (%edi), %eax 293 mov b_offset(%edi), %ebx 294 mov c_offset(%edi), %ecx 295 mov d_offset(%edi), %edx 296 output_whitening(%eax,%ebp,a_offset) 297 output_whitening(%ebx,%ebp,b_offset) 298 ror $16, %ebx 299 output_whitening(%ecx,%ebp,c_offset) 300 output_whitening(%edx,%ebp,d_offset) 301 rol $1, %ecx 302 303 decrypt_round(R0,R1,R2,R3,15*8); 304 decrypt_round(R2,R3,R0,R1,14*8); 305 decrypt_round(R0,R1,R2,R3,13*8); 306 decrypt_round(R2,R3,R0,R1,12*8); 307 decrypt_round(R0,R1,R2,R3,11*8); 308 decrypt_round(R2,R3,R0,R1,10*8); 309 decrypt_round(R0,R1,R2,R3,9*8); 310 decrypt_round(R2,R3,R0,R1,8*8); 311 decrypt_round(R0,R1,R2,R3,7*8); 312 decrypt_round(R2,R3,R0,R1,6*8); 313 decrypt_round(R0,R1,R2,R3,5*8); 314 decrypt_round(R2,R3,R0,R1,4*8); 315 decrypt_round(R0,R1,R2,R3,3*8); 316 decrypt_round(R2,R3,R0,R1,2*8); 317 decrypt_round(R0,R1,R2,R3,1*8); 318 decrypt_last_round(R2,R3,R0,R1,0); 319 320 input_whitening(%eax,%ebp,c_offset) 321 input_whitening(%ebx,%ebp,d_offset) 322 input_whitening(%ecx,%ebp,a_offset) 323 input_whitening(%edx,%ebp,b_offset) 324 mov out_blk+16(%esp),%edi; 325 mov %eax, c_offset(%edi) 326 mov %ebx, d_offset(%edi) 327 mov %ecx, (%edi) 328 mov %edx, b_offset(%edi) 329 330 pop %edi 331 pop %esi 332 pop %ebx 333 pop %ebp 334 mov $1, %eax 335 ret 336