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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /*************************************************************************** * Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de> * * * ***************************************************************************/ .file "twofish-i586-asm.S" .text #include <linux/linkage.h> #include <asm/asm-offsets.h> /* return address at 0 */ #define in_blk 12 /* input byte array address parameter*/ #define out_blk 8 /* output byte array address parameter*/ #define ctx 4 /* Twofish context structure */ #define a_offset 0 #define b_offset 4 #define c_offset 8 #define d_offset 12 /* Structure of the crypto context struct*/ #define s0 0 /* S0 Array 256 Words each */ #define s1 1024 /* S1 Array */ #define s2 2048 /* S2 Array */ #define s3 3072 /* S3 Array */ #define w 4096 /* 8 whitening keys (word) */ #define k 4128 /* key 1-32 ( word ) */ /* define a few register aliases to allow macro substitution */ #define R0D %eax #define R0B %al #define R0H %ah #define R1D %ebx #define R1B %bl #define R1H %bh #define R2D %ecx #define R2B %cl #define R2H %ch #define R3D %edx #define R3B %dl #define R3H %dh /* performs input whitening */ #define input_whitening(src,context,offset)\ xor w+offset(context), src; /* performs input whitening */ #define output_whitening(src,context,offset)\ xor w+16+offset(context), src; /* * a input register containing a (rotated 16) * b input register containing b * c input register containing c * d input register containing d (already rol $1) * operations on a and b are interleaved to increase performance */ #define encrypt_round(a,b,c,d,round)\ push d ## D;\ movzx b ## B, %edi;\ mov s1(%ebp,%edi,4),d ## D;\ movzx a ## B, %edi;\ mov s2(%ebp,%edi,4),%esi;\ movzx b ## H, %edi;\ ror $16, b ## D;\ xor s2(%ebp,%edi,4),d ## D;\ movzx a ## H, %edi;\ ror $16, a ## D;\ xor s3(%ebp,%edi,4),%esi;\ movzx b ## B, %edi;\ xor s3(%ebp,%edi,4),d ## D;\ movzx a ## B, %edi;\ xor (%ebp,%edi,4), %esi;\ movzx b ## H, %edi;\ ror $15, b ## D;\ xor (%ebp,%edi,4), d ## D;\ movzx a ## H, %edi;\ xor s1(%ebp,%edi,4),%esi;\ pop %edi;\ add d ## D, %esi;\ add %esi, d ## D;\ add k+round(%ebp), %esi;\ xor %esi, c ## D;\ rol $15, c ## D;\ add k+4+round(%ebp),d ## D;\ xor %edi, d ## D; /* * a input register containing a (rotated 16) * b input register containing b * c input register containing c * d input register containing d (already rol $1) * operations on a and b are interleaved to increase performance * last round has different rotations for the output preparation */ #define encrypt_last_round(a,b,c,d,round)\ push d ## D;\ movzx b ## B, %edi;\ mov s1(%ebp,%edi,4),d ## D;\ movzx a ## B, %edi;\ mov s2(%ebp,%edi,4),%esi;\ movzx b ## H, %edi;\ ror $16, b ## D;\ xor s2(%ebp,%edi,4),d ## D;\ movzx a ## H, %edi;\ ror $16, a ## D;\ xor s3(%ebp,%edi,4),%esi;\ movzx b ## B, %edi;\ xor s3(%ebp,%edi,4),d ## D;\ movzx a ## B, %edi;\ xor (%ebp,%edi,4), %esi;\ movzx b ## H, %edi;\ ror $16, b ## D;\ xor (%ebp,%edi,4), d ## D;\ movzx a ## H, %edi;\ xor s1(%ebp,%edi,4),%esi;\ pop %edi;\ add d ## D, %esi;\ add %esi, d ## D;\ add k+round(%ebp), %esi;\ xor %esi, c ## D;\ ror $1, c ## D;\ add k+4+round(%ebp),d ## D;\ xor %edi, d ## D; /* * a input register containing a * b input register containing b (rotated 16) * c input register containing c * d input register containing d (already rol $1) * operations on a and b are interleaved to increase performance */ #define decrypt_round(a,b,c,d,round)\ push c ## D;\ movzx a ## B, %edi;\ mov (%ebp,%edi,4), c ## D;\ movzx b ## B, %edi;\ mov s3(%ebp,%edi,4),%esi;\ movzx a ## H, %edi;\ ror $16, a ## D;\ xor s1(%ebp,%edi,4),c ## D;\ movzx b ## H, %edi;\ ror $16, b ## D;\ xor (%ebp,%edi,4), %esi;\ movzx a ## B, %edi;\ xor s2(%ebp,%edi,4),c ## D;\ movzx b ## B, %edi;\ xor s1(%ebp,%edi,4),%esi;\ movzx a ## H, %edi;\ ror $15, a ## D;\ xor s3(%ebp,%edi,4),c ## D;\ movzx b ## H, %edi;\ xor s2(%ebp,%edi,4),%esi;\ pop %edi;\ add %esi, c ## D;\ add c ## D, %esi;\ add k+round(%ebp), c ## D;\ xor %edi, c ## D;\ add k+4+round(%ebp),%esi;\ xor %esi, d ## D;\ rol $15, d ## D; /* * a input register containing a * b input register containing b (rotated 16) * c input register containing c * d input register containing d (already rol $1) * operations on a and b are interleaved to increase performance * last round has different rotations for the output preparation */ #define decrypt_last_round(a,b,c,d,round)\ push c ## D;\ movzx a ## B, %edi;\ mov (%ebp,%edi,4), c ## D;\ movzx b ## B, %edi;\ mov s3(%ebp,%edi,4),%esi;\ movzx a ## H, %edi;\ ror $16, a ## D;\ xor s1(%ebp,%edi,4),c ## D;\ movzx b ## H, %edi;\ ror $16, b ## D;\ xor (%ebp,%edi,4), %esi;\ movzx a ## B, %edi;\ xor s2(%ebp,%edi,4),c ## D;\ movzx b ## B, %edi;\ xor s1(%ebp,%edi,4),%esi;\ movzx a ## H, %edi;\ ror $16, a ## D;\ xor s3(%ebp,%edi,4),c ## D;\ movzx b ## H, %edi;\ xor s2(%ebp,%edi,4),%esi;\ pop %edi;\ add %esi, c ## D;\ add c ## D, %esi;\ add k+round(%ebp), c ## D;\ xor %edi, c ## D;\ add k+4+round(%ebp),%esi;\ xor %esi, d ## D;\ ror $1, d ## D; SYM_FUNC_START(twofish_enc_blk) push %ebp /* save registers according to calling convention*/ push %ebx push %esi push %edi mov ctx + 16(%esp), %ebp /* abuse the base pointer: set new base * pointer to the ctx address */ mov in_blk+16(%esp),%edi /* input address in edi */ mov (%edi), %eax mov b_offset(%edi), %ebx mov c_offset(%edi), %ecx mov d_offset(%edi), %edx input_whitening(%eax,%ebp,a_offset) ror $16, %eax input_whitening(%ebx,%ebp,b_offset) input_whitening(%ecx,%ebp,c_offset) input_whitening(%edx,%ebp,d_offset) rol $1, %edx encrypt_round(R0,R1,R2,R3,0); encrypt_round(R2,R3,R0,R1,8); encrypt_round(R0,R1,R2,R3,2*8); encrypt_round(R2,R3,R0,R1,3*8); encrypt_round(R0,R1,R2,R3,4*8); encrypt_round(R2,R3,R0,R1,5*8); encrypt_round(R0,R1,R2,R3,6*8); encrypt_round(R2,R3,R0,R1,7*8); encrypt_round(R0,R1,R2,R3,8*8); encrypt_round(R2,R3,R0,R1,9*8); encrypt_round(R0,R1,R2,R3,10*8); encrypt_round(R2,R3,R0,R1,11*8); encrypt_round(R0,R1,R2,R3,12*8); encrypt_round(R2,R3,R0,R1,13*8); encrypt_round(R0,R1,R2,R3,14*8); encrypt_last_round(R2,R3,R0,R1,15*8); output_whitening(%eax,%ebp,c_offset) output_whitening(%ebx,%ebp,d_offset) output_whitening(%ecx,%ebp,a_offset) output_whitening(%edx,%ebp,b_offset) mov out_blk+16(%esp),%edi; mov %eax, c_offset(%edi) mov %ebx, d_offset(%edi) mov %ecx, (%edi) mov %edx, b_offset(%edi) pop %edi pop %esi pop %ebx pop %ebp mov $1, %eax RET SYM_FUNC_END(twofish_enc_blk) SYM_FUNC_START(twofish_dec_blk) push %ebp /* save registers according to calling convention*/ push %ebx push %esi push %edi mov ctx + 16(%esp), %ebp /* abuse the base pointer: set new base * pointer to the ctx address */ mov in_blk+16(%esp),%edi /* input address in edi */ mov (%edi), %eax mov b_offset(%edi), %ebx mov c_offset(%edi), %ecx mov d_offset(%edi), %edx output_whitening(%eax,%ebp,a_offset) output_whitening(%ebx,%ebp,b_offset) ror $16, %ebx output_whitening(%ecx,%ebp,c_offset) output_whitening(%edx,%ebp,d_offset) rol $1, %ecx decrypt_round(R0,R1,R2,R3,15*8); decrypt_round(R2,R3,R0,R1,14*8); decrypt_round(R0,R1,R2,R3,13*8); decrypt_round(R2,R3,R0,R1,12*8); decrypt_round(R0,R1,R2,R3,11*8); decrypt_round(R2,R3,R0,R1,10*8); decrypt_round(R0,R1,R2,R3,9*8); decrypt_round(R2,R3,R0,R1,8*8); decrypt_round(R0,R1,R2,R3,7*8); decrypt_round(R2,R3,R0,R1,6*8); decrypt_round(R0,R1,R2,R3,5*8); decrypt_round(R2,R3,R0,R1,4*8); decrypt_round(R0,R1,R2,R3,3*8); decrypt_round(R2,R3,R0,R1,2*8); decrypt_round(R0,R1,R2,R3,1*8); decrypt_last_round(R2,R3,R0,R1,0); input_whitening(%eax,%ebp,c_offset) input_whitening(%ebx,%ebp,d_offset) input_whitening(%ecx,%ebp,a_offset) input_whitening(%edx,%ebp,b_offset) mov out_blk+16(%esp),%edi; mov %eax, c_offset(%edi) mov %ebx, d_offset(%edi) mov %ecx, (%edi) mov %edx, b_offset(%edi) pop %edi pop %esi pop %ebx pop %ebp mov $1, %eax RET SYM_FUNC_END(twofish_dec_blk) |