Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1 | #!/usr/bin/env perl |
| 2 | # |
| 3 | # ==================================================================== |
| 4 | # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL |
| 5 | # project. The module is, however, dual licensed under OpenSSL and |
| 6 | # CRYPTOGAMS licenses depending on where you obtain it. For further |
| 7 | # details see http://www.openssl.org/~appro/cryptogams/. |
| 8 | # ==================================================================== |
| 9 | # |
| 10 | # April 2010 |
| 11 | # |
| 12 | # The module implements "4-bit" GCM GHASH function and underlying |
| 13 | # single multiplication operation in GF(2^128). "4-bit" means that it |
| 14 | # uses 256 bytes per-key table [+32 bytes shared table]. There is no |
| 15 | # experimental performance data available yet. The only approximation |
| 16 | # that can be made at this point is based on code size. Inner loop is |
| 17 | # 32 instructions long and on single-issue core should execute in <40 |
| 18 | # cycles. Having verified that gcc 3.4 didn't unroll corresponding |
| 19 | # loop, this assembler loop body was found to be ~3x smaller than |
| 20 | # compiler-generated one... |
| 21 | # |
| 22 | # July 2010 |
| 23 | # |
| 24 | # Rescheduling for dual-issue pipeline resulted in 8.5% improvement on |
| 25 | # Cortex A8 core and ~25 cycles per processed byte (which was observed |
| 26 | # to be ~3 times faster than gcc-generated code:-) |
| 27 | # |
| 28 | # February 2011 |
| 29 | # |
| 30 | # Profiler-assisted and platform-specific optimization resulted in 7% |
| 31 | # improvement on Cortex A8 core and ~23.5 cycles per byte. |
| 32 | # |
| 33 | # March 2011 |
| 34 | # |
| 35 | # Add NEON implementation featuring polynomial multiplication, i.e. no |
| 36 | # lookup tables involved. On Cortex A8 it was measured to process one |
| 37 | # byte in 15 cycles or 55% faster than integer-only code. |
| 38 | # |
| 39 | # April 2014 |
| 40 | # |
| 41 | # Switch to multiplication algorithm suggested in paper referred |
| 42 | # below and combine it with reduction algorithm from x86 module. |
| 43 | # Performance improvement over previous version varies from 65% on |
| 44 | # Snapdragon S4 to 110% on Cortex A9. In absolute terms Cortex A8 |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 45 | # processes one byte in 8.45 cycles, A9 - in 10.2, A15 - in 7.63, |
| 46 | # Snapdragon S4 - in 9.33. |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 47 | # |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 48 | # Câmara, D.; Gouvêa, C. P. L.; López, J. & Dahab, R.: Fast Software |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 49 | # Polynomial Multiplication on ARM Processors using the NEON Engine. |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 50 | # |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 51 | # http://conradoplg.cryptoland.net/files/2010/12/mocrysen13.pdf |
| 52 | |
| 53 | # ==================================================================== |
| 54 | # Note about "528B" variant. In ARM case it makes lesser sense to |
| 55 | # implement it for following reasons: |
| 56 | # |
| 57 | # - performance improvement won't be anywhere near 50%, because 128- |
| 58 | # bit shift operation is neatly fused with 128-bit xor here, and |
| 59 | # "538B" variant would eliminate only 4-5 instructions out of 32 |
| 60 | # in the inner loop (meaning that estimated improvement is ~15%); |
| 61 | # - ARM-based systems are often embedded ones and extra memory |
| 62 | # consumption might be unappreciated (for so little improvement); |
| 63 | # |
| 64 | # Byte order [in]dependence. ========================================= |
| 65 | # |
| 66 | # Caller is expected to maintain specific *dword* order in Htable, |
| 67 | # namely with *least* significant dword of 128-bit value at *lower* |
| 68 | # address. This differs completely from C code and has everything to |
| 69 | # do with ldm instruction and order in which dwords are "consumed" by |
| 70 | # algorithm. *Byte* order within these dwords in turn is whatever |
| 71 | # *native* byte order on current platform. See gcm128.c for working |
| 72 | # example... |
| 73 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 74 | $flavour = shift; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 75 | if ($flavour=~/\w[\w\-]*\.\w+$/) { $output=$flavour; undef $flavour; } |
| 76 | else { while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {} } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 77 | |
| 78 | if ($flavour && $flavour ne "void") { |
| 79 | $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; |
| 80 | ( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or |
Robert Sloan | 9254e68 | 2017-04-24 09:42:06 -0700 | [diff] [blame] | 81 | ( $xlate="${dir}../../../perlasm/arm-xlate.pl" and -f $xlate) or |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 82 | die "can't locate arm-xlate.pl"; |
| 83 | |
| 84 | open STDOUT,"| \"$^X\" $xlate $flavour $output"; |
| 85 | } else { |
| 86 | open STDOUT,">$output"; |
| 87 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 88 | |
| 89 | $Xi="r0"; # argument block |
| 90 | $Htbl="r1"; |
| 91 | $inp="r2"; |
| 92 | $len="r3"; |
| 93 | |
| 94 | $Zll="r4"; # variables |
| 95 | $Zlh="r5"; |
| 96 | $Zhl="r6"; |
| 97 | $Zhh="r7"; |
| 98 | $Tll="r8"; |
| 99 | $Tlh="r9"; |
| 100 | $Thl="r10"; |
| 101 | $Thh="r11"; |
| 102 | $nlo="r12"; |
| 103 | ################# r13 is stack pointer |
| 104 | $nhi="r14"; |
| 105 | ################# r15 is program counter |
| 106 | |
| 107 | $rem_4bit=$inp; # used in gcm_gmult_4bit |
| 108 | $cnt=$len; |
| 109 | |
| 110 | sub Zsmash() { |
| 111 | my $i=12; |
| 112 | my @args=@_; |
| 113 | for ($Zll,$Zlh,$Zhl,$Zhh) { |
| 114 | $code.=<<___; |
| 115 | #if __ARM_ARCH__>=7 && defined(__ARMEL__) |
| 116 | rev $_,$_ |
| 117 | str $_,[$Xi,#$i] |
| 118 | #elif defined(__ARMEB__) |
| 119 | str $_,[$Xi,#$i] |
| 120 | #else |
| 121 | mov $Tlh,$_,lsr#8 |
| 122 | strb $_,[$Xi,#$i+3] |
| 123 | mov $Thl,$_,lsr#16 |
| 124 | strb $Tlh,[$Xi,#$i+2] |
| 125 | mov $Thh,$_,lsr#24 |
| 126 | strb $Thl,[$Xi,#$i+1] |
| 127 | strb $Thh,[$Xi,#$i] |
| 128 | #endif |
| 129 | ___ |
| 130 | $code.="\t".shift(@args)."\n"; |
| 131 | $i-=4; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | $code=<<___; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 136 | #include <openssl/arm_arch.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 137 | |
| 138 | .syntax unified |
| 139 | |
| 140 | .text |
| 141 | .code 32 |
| 142 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 143 | #ifdef __clang__ |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 144 | #define ldrplb ldrbpl |
| 145 | #define ldrneb ldrbne |
| 146 | #endif |
| 147 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 148 | .type rem_4bit,%object |
| 149 | .align 5 |
| 150 | rem_4bit: |
| 151 | .short 0x0000,0x1C20,0x3840,0x2460 |
| 152 | .short 0x7080,0x6CA0,0x48C0,0x54E0 |
| 153 | .short 0xE100,0xFD20,0xD940,0xC560 |
| 154 | .short 0x9180,0x8DA0,0xA9C0,0xB5E0 |
| 155 | .size rem_4bit,.-rem_4bit |
| 156 | |
| 157 | .type rem_4bit_get,%function |
| 158 | rem_4bit_get: |
| 159 | sub $rem_4bit,pc,#8 |
| 160 | sub $rem_4bit,$rem_4bit,#32 @ &rem_4bit |
| 161 | b .Lrem_4bit_got |
| 162 | nop |
| 163 | .size rem_4bit_get,.-rem_4bit_get |
| 164 | |
| 165 | .global gcm_ghash_4bit |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 166 | .type gcm_ghash_4bit,%function |
| 167 | gcm_ghash_4bit: |
| 168 | sub r12,pc,#8 |
| 169 | add $len,$inp,$len @ $len to point at the end |
| 170 | stmdb sp!,{r3-r11,lr} @ save $len/end too |
| 171 | sub r12,r12,#48 @ &rem_4bit |
| 172 | |
| 173 | ldmia r12,{r4-r11} @ copy rem_4bit ... |
| 174 | stmdb sp!,{r4-r11} @ ... to stack |
| 175 | |
| 176 | ldrb $nlo,[$inp,#15] |
| 177 | ldrb $nhi,[$Xi,#15] |
| 178 | .Louter: |
| 179 | eor $nlo,$nlo,$nhi |
| 180 | and $nhi,$nlo,#0xf0 |
| 181 | and $nlo,$nlo,#0x0f |
| 182 | mov $cnt,#14 |
| 183 | |
| 184 | add $Zhh,$Htbl,$nlo,lsl#4 |
| 185 | ldmia $Zhh,{$Zll-$Zhh} @ load Htbl[nlo] |
| 186 | add $Thh,$Htbl,$nhi |
| 187 | ldrb $nlo,[$inp,#14] |
| 188 | |
| 189 | and $nhi,$Zll,#0xf @ rem |
| 190 | ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi] |
| 191 | add $nhi,$nhi,$nhi |
| 192 | eor $Zll,$Tll,$Zll,lsr#4 |
| 193 | ldrh $Tll,[sp,$nhi] @ rem_4bit[rem] |
| 194 | eor $Zll,$Zll,$Zlh,lsl#28 |
| 195 | ldrb $nhi,[$Xi,#14] |
| 196 | eor $Zlh,$Tlh,$Zlh,lsr#4 |
| 197 | eor $Zlh,$Zlh,$Zhl,lsl#28 |
| 198 | eor $Zhl,$Thl,$Zhl,lsr#4 |
| 199 | eor $Zhl,$Zhl,$Zhh,lsl#28 |
| 200 | eor $Zhh,$Thh,$Zhh,lsr#4 |
| 201 | eor $nlo,$nlo,$nhi |
| 202 | and $nhi,$nlo,#0xf0 |
| 203 | and $nlo,$nlo,#0x0f |
| 204 | eor $Zhh,$Zhh,$Tll,lsl#16 |
| 205 | |
| 206 | .Linner: |
| 207 | add $Thh,$Htbl,$nlo,lsl#4 |
| 208 | and $nlo,$Zll,#0xf @ rem |
| 209 | subs $cnt,$cnt,#1 |
| 210 | add $nlo,$nlo,$nlo |
| 211 | ldmia $Thh,{$Tll-$Thh} @ load Htbl[nlo] |
| 212 | eor $Zll,$Tll,$Zll,lsr#4 |
| 213 | eor $Zll,$Zll,$Zlh,lsl#28 |
| 214 | eor $Zlh,$Tlh,$Zlh,lsr#4 |
| 215 | eor $Zlh,$Zlh,$Zhl,lsl#28 |
| 216 | ldrh $Tll,[sp,$nlo] @ rem_4bit[rem] |
| 217 | eor $Zhl,$Thl,$Zhl,lsr#4 |
| 218 | ldrbpl $nlo,[$inp,$cnt] |
| 219 | eor $Zhl,$Zhl,$Zhh,lsl#28 |
| 220 | eor $Zhh,$Thh,$Zhh,lsr#4 |
| 221 | |
| 222 | add $Thh,$Htbl,$nhi |
| 223 | and $nhi,$Zll,#0xf @ rem |
| 224 | eor $Zhh,$Zhh,$Tll,lsl#16 @ ^= rem_4bit[rem] |
| 225 | add $nhi,$nhi,$nhi |
| 226 | ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi] |
| 227 | eor $Zll,$Tll,$Zll,lsr#4 |
| 228 | ldrbpl $Tll,[$Xi,$cnt] |
| 229 | eor $Zll,$Zll,$Zlh,lsl#28 |
| 230 | eor $Zlh,$Tlh,$Zlh,lsr#4 |
| 231 | ldrh $Tlh,[sp,$nhi] |
| 232 | eor $Zlh,$Zlh,$Zhl,lsl#28 |
| 233 | eor $Zhl,$Thl,$Zhl,lsr#4 |
| 234 | eor $Zhl,$Zhl,$Zhh,lsl#28 |
| 235 | eorpl $nlo,$nlo,$Tll |
| 236 | eor $Zhh,$Thh,$Zhh,lsr#4 |
| 237 | andpl $nhi,$nlo,#0xf0 |
| 238 | andpl $nlo,$nlo,#0x0f |
| 239 | eor $Zhh,$Zhh,$Tlh,lsl#16 @ ^= rem_4bit[rem] |
| 240 | bpl .Linner |
| 241 | |
| 242 | ldr $len,[sp,#32] @ re-load $len/end |
| 243 | add $inp,$inp,#16 |
| 244 | mov $nhi,$Zll |
| 245 | ___ |
| 246 | &Zsmash("cmp\t$inp,$len","ldrbne\t$nlo,[$inp,#15]"); |
| 247 | $code.=<<___; |
| 248 | bne .Louter |
| 249 | |
| 250 | add sp,sp,#36 |
| 251 | #if __ARM_ARCH__>=5 |
| 252 | ldmia sp!,{r4-r11,pc} |
| 253 | #else |
| 254 | ldmia sp!,{r4-r11,lr} |
| 255 | tst lr,#1 |
| 256 | moveq pc,lr @ be binary compatible with V4, yet |
| 257 | bx lr @ interoperable with Thumb ISA:-) |
| 258 | #endif |
| 259 | .size gcm_ghash_4bit,.-gcm_ghash_4bit |
| 260 | |
| 261 | .global gcm_gmult_4bit |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 262 | .type gcm_gmult_4bit,%function |
| 263 | gcm_gmult_4bit: |
| 264 | stmdb sp!,{r4-r11,lr} |
| 265 | ldrb $nlo,[$Xi,#15] |
| 266 | b rem_4bit_get |
| 267 | .Lrem_4bit_got: |
| 268 | and $nhi,$nlo,#0xf0 |
| 269 | and $nlo,$nlo,#0x0f |
| 270 | mov $cnt,#14 |
| 271 | |
| 272 | add $Zhh,$Htbl,$nlo,lsl#4 |
| 273 | ldmia $Zhh,{$Zll-$Zhh} @ load Htbl[nlo] |
| 274 | ldrb $nlo,[$Xi,#14] |
| 275 | |
| 276 | add $Thh,$Htbl,$nhi |
| 277 | and $nhi,$Zll,#0xf @ rem |
| 278 | ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi] |
| 279 | add $nhi,$nhi,$nhi |
| 280 | eor $Zll,$Tll,$Zll,lsr#4 |
| 281 | ldrh $Tll,[$rem_4bit,$nhi] @ rem_4bit[rem] |
| 282 | eor $Zll,$Zll,$Zlh,lsl#28 |
| 283 | eor $Zlh,$Tlh,$Zlh,lsr#4 |
| 284 | eor $Zlh,$Zlh,$Zhl,lsl#28 |
| 285 | eor $Zhl,$Thl,$Zhl,lsr#4 |
| 286 | eor $Zhl,$Zhl,$Zhh,lsl#28 |
| 287 | eor $Zhh,$Thh,$Zhh,lsr#4 |
| 288 | and $nhi,$nlo,#0xf0 |
| 289 | eor $Zhh,$Zhh,$Tll,lsl#16 |
| 290 | and $nlo,$nlo,#0x0f |
| 291 | |
| 292 | .Loop: |
| 293 | add $Thh,$Htbl,$nlo,lsl#4 |
| 294 | and $nlo,$Zll,#0xf @ rem |
| 295 | subs $cnt,$cnt,#1 |
| 296 | add $nlo,$nlo,$nlo |
| 297 | ldmia $Thh,{$Tll-$Thh} @ load Htbl[nlo] |
| 298 | eor $Zll,$Tll,$Zll,lsr#4 |
| 299 | eor $Zll,$Zll,$Zlh,lsl#28 |
| 300 | eor $Zlh,$Tlh,$Zlh,lsr#4 |
| 301 | eor $Zlh,$Zlh,$Zhl,lsl#28 |
| 302 | ldrh $Tll,[$rem_4bit,$nlo] @ rem_4bit[rem] |
| 303 | eor $Zhl,$Thl,$Zhl,lsr#4 |
| 304 | ldrbpl $nlo,[$Xi,$cnt] |
| 305 | eor $Zhl,$Zhl,$Zhh,lsl#28 |
| 306 | eor $Zhh,$Thh,$Zhh,lsr#4 |
| 307 | |
| 308 | add $Thh,$Htbl,$nhi |
| 309 | and $nhi,$Zll,#0xf @ rem |
| 310 | eor $Zhh,$Zhh,$Tll,lsl#16 @ ^= rem_4bit[rem] |
| 311 | add $nhi,$nhi,$nhi |
| 312 | ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi] |
| 313 | eor $Zll,$Tll,$Zll,lsr#4 |
| 314 | eor $Zll,$Zll,$Zlh,lsl#28 |
| 315 | eor $Zlh,$Tlh,$Zlh,lsr#4 |
| 316 | ldrh $Tll,[$rem_4bit,$nhi] @ rem_4bit[rem] |
| 317 | eor $Zlh,$Zlh,$Zhl,lsl#28 |
| 318 | eor $Zhl,$Thl,$Zhl,lsr#4 |
| 319 | eor $Zhl,$Zhl,$Zhh,lsl#28 |
| 320 | eor $Zhh,$Thh,$Zhh,lsr#4 |
| 321 | andpl $nhi,$nlo,#0xf0 |
| 322 | andpl $nlo,$nlo,#0x0f |
| 323 | eor $Zhh,$Zhh,$Tll,lsl#16 @ ^= rem_4bit[rem] |
| 324 | bpl .Loop |
| 325 | ___ |
| 326 | &Zsmash(); |
| 327 | $code.=<<___; |
| 328 | #if __ARM_ARCH__>=5 |
| 329 | ldmia sp!,{r4-r11,pc} |
| 330 | #else |
| 331 | ldmia sp!,{r4-r11,lr} |
| 332 | tst lr,#1 |
| 333 | moveq pc,lr @ be binary compatible with V4, yet |
| 334 | bx lr @ interoperable with Thumb ISA:-) |
| 335 | #endif |
| 336 | .size gcm_gmult_4bit,.-gcm_gmult_4bit |
| 337 | ___ |
| 338 | { |
| 339 | my ($Xl,$Xm,$Xh,$IN)=map("q$_",(0..3)); |
| 340 | my ($t0,$t1,$t2,$t3)=map("q$_",(8..12)); |
| 341 | my ($Hlo,$Hhi,$Hhl,$k48,$k32,$k16)=map("d$_",(26..31)); |
| 342 | |
| 343 | sub clmul64x64 { |
| 344 | my ($r,$a,$b)=@_; |
| 345 | $code.=<<___; |
| 346 | vext.8 $t0#lo, $a, $a, #1 @ A1 |
| 347 | vmull.p8 $t0, $t0#lo, $b @ F = A1*B |
| 348 | vext.8 $r#lo, $b, $b, #1 @ B1 |
| 349 | vmull.p8 $r, $a, $r#lo @ E = A*B1 |
| 350 | vext.8 $t1#lo, $a, $a, #2 @ A2 |
| 351 | vmull.p8 $t1, $t1#lo, $b @ H = A2*B |
| 352 | vext.8 $t3#lo, $b, $b, #2 @ B2 |
| 353 | vmull.p8 $t3, $a, $t3#lo @ G = A*B2 |
| 354 | vext.8 $t2#lo, $a, $a, #3 @ A3 |
| 355 | veor $t0, $t0, $r @ L = E + F |
| 356 | vmull.p8 $t2, $t2#lo, $b @ J = A3*B |
| 357 | vext.8 $r#lo, $b, $b, #3 @ B3 |
| 358 | veor $t1, $t1, $t3 @ M = G + H |
| 359 | vmull.p8 $r, $a, $r#lo @ I = A*B3 |
| 360 | veor $t0#lo, $t0#lo, $t0#hi @ t0 = (L) (P0 + P1) << 8 |
| 361 | vand $t0#hi, $t0#hi, $k48 |
| 362 | vext.8 $t3#lo, $b, $b, #4 @ B4 |
| 363 | veor $t1#lo, $t1#lo, $t1#hi @ t1 = (M) (P2 + P3) << 16 |
| 364 | vand $t1#hi, $t1#hi, $k32 |
| 365 | vmull.p8 $t3, $a, $t3#lo @ K = A*B4 |
| 366 | veor $t2, $t2, $r @ N = I + J |
| 367 | veor $t0#lo, $t0#lo, $t0#hi |
| 368 | veor $t1#lo, $t1#lo, $t1#hi |
| 369 | veor $t2#lo, $t2#lo, $t2#hi @ t2 = (N) (P4 + P5) << 24 |
| 370 | vand $t2#hi, $t2#hi, $k16 |
| 371 | vext.8 $t0, $t0, $t0, #15 |
| 372 | veor $t3#lo, $t3#lo, $t3#hi @ t3 = (K) (P6 + P7) << 32 |
| 373 | vmov.i64 $t3#hi, #0 |
| 374 | vext.8 $t1, $t1, $t1, #14 |
| 375 | veor $t2#lo, $t2#lo, $t2#hi |
| 376 | vmull.p8 $r, $a, $b @ D = A*B |
| 377 | vext.8 $t3, $t3, $t3, #12 |
| 378 | vext.8 $t2, $t2, $t2, #13 |
| 379 | veor $t0, $t0, $t1 |
| 380 | veor $t2, $t2, $t3 |
| 381 | veor $r, $r, $t0 |
| 382 | veor $r, $r, $t2 |
| 383 | ___ |
| 384 | } |
| 385 | |
| 386 | $code.=<<___; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 387 | #if __ARM_MAX_ARCH__>=7 |
| 388 | .arch armv7-a |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 389 | .fpu neon |
| 390 | |
| 391 | .global gcm_init_neon |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 392 | .type gcm_init_neon,%function |
| 393 | .align 4 |
| 394 | gcm_init_neon: |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 395 | vld1.64 $IN#hi,[r1]! @ load H |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 396 | vmov.i8 $t0,#0xe1 |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 397 | vld1.64 $IN#lo,[r1] |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 398 | vshl.i64 $t0#hi,#57 |
| 399 | vshr.u64 $t0#lo,#63 @ t0=0xc2....01 |
| 400 | vdup.8 $t1,$IN#hi[7] |
| 401 | vshr.u64 $Hlo,$IN#lo,#63 |
| 402 | vshr.s8 $t1,#7 @ broadcast carry bit |
| 403 | vshl.i64 $IN,$IN,#1 |
| 404 | vand $t0,$t0,$t1 |
| 405 | vorr $IN#hi,$Hlo @ H<<<=1 |
| 406 | veor $IN,$IN,$t0 @ twisted H |
| 407 | vstmia r0,{$IN} |
| 408 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 409 | ret @ bx lr |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 410 | .size gcm_init_neon,.-gcm_init_neon |
| 411 | |
| 412 | .global gcm_gmult_neon |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 413 | .type gcm_gmult_neon,%function |
| 414 | .align 4 |
| 415 | gcm_gmult_neon: |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 416 | vld1.64 $IN#hi,[$Xi]! @ load Xi |
| 417 | vld1.64 $IN#lo,[$Xi]! |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 418 | vmov.i64 $k48,#0x0000ffffffffffff |
| 419 | vldmia $Htbl,{$Hlo-$Hhi} @ load twisted H |
| 420 | vmov.i64 $k32,#0x00000000ffffffff |
| 421 | #ifdef __ARMEL__ |
| 422 | vrev64.8 $IN,$IN |
| 423 | #endif |
| 424 | vmov.i64 $k16,#0x000000000000ffff |
| 425 | veor $Hhl,$Hlo,$Hhi @ Karatsuba pre-processing |
| 426 | mov $len,#16 |
| 427 | b .Lgmult_neon |
| 428 | .size gcm_gmult_neon,.-gcm_gmult_neon |
| 429 | |
| 430 | .global gcm_ghash_neon |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 431 | .type gcm_ghash_neon,%function |
| 432 | .align 4 |
| 433 | gcm_ghash_neon: |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 434 | vld1.64 $Xl#hi,[$Xi]! @ load Xi |
| 435 | vld1.64 $Xl#lo,[$Xi]! |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 436 | vmov.i64 $k48,#0x0000ffffffffffff |
| 437 | vldmia $Htbl,{$Hlo-$Hhi} @ load twisted H |
| 438 | vmov.i64 $k32,#0x00000000ffffffff |
| 439 | #ifdef __ARMEL__ |
| 440 | vrev64.8 $Xl,$Xl |
| 441 | #endif |
| 442 | vmov.i64 $k16,#0x000000000000ffff |
| 443 | veor $Hhl,$Hlo,$Hhi @ Karatsuba pre-processing |
| 444 | |
| 445 | .Loop_neon: |
| 446 | vld1.64 $IN#hi,[$inp]! @ load inp |
| 447 | vld1.64 $IN#lo,[$inp]! |
| 448 | #ifdef __ARMEL__ |
| 449 | vrev64.8 $IN,$IN |
| 450 | #endif |
| 451 | veor $IN,$Xl @ inp^=Xi |
| 452 | .Lgmult_neon: |
| 453 | ___ |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 454 | &clmul64x64 ($Xl,$Hlo,"$IN#lo"); # H.lo·Xi.lo |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 455 | $code.=<<___; |
| 456 | veor $IN#lo,$IN#lo,$IN#hi @ Karatsuba pre-processing |
| 457 | ___ |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 458 | &clmul64x64 ($Xm,$Hhl,"$IN#lo"); # (H.lo+H.hi)·(Xi.lo+Xi.hi) |
| 459 | &clmul64x64 ($Xh,$Hhi,"$IN#hi"); # H.hi·Xi.hi |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 460 | $code.=<<___; |
| 461 | veor $Xm,$Xm,$Xl @ Karatsuba post-processing |
| 462 | veor $Xm,$Xm,$Xh |
| 463 | veor $Xl#hi,$Xl#hi,$Xm#lo |
| 464 | veor $Xh#lo,$Xh#lo,$Xm#hi @ Xh|Xl - 256-bit result |
| 465 | |
| 466 | @ equivalent of reduction_avx from ghash-x86_64.pl |
| 467 | vshl.i64 $t1,$Xl,#57 @ 1st phase |
| 468 | vshl.i64 $t2,$Xl,#62 |
| 469 | veor $t2,$t2,$t1 @ |
| 470 | vshl.i64 $t1,$Xl,#63 |
| 471 | veor $t2, $t2, $t1 @ |
| 472 | veor $Xl#hi,$Xl#hi,$t2#lo @ |
| 473 | veor $Xh#lo,$Xh#lo,$t2#hi |
| 474 | |
| 475 | vshr.u64 $t2,$Xl,#1 @ 2nd phase |
| 476 | veor $Xh,$Xh,$Xl |
| 477 | veor $Xl,$Xl,$t2 @ |
| 478 | vshr.u64 $t2,$t2,#6 |
| 479 | vshr.u64 $Xl,$Xl,#1 @ |
| 480 | veor $Xl,$Xl,$Xh @ |
| 481 | veor $Xl,$Xl,$t2 @ |
| 482 | |
| 483 | subs $len,#16 |
| 484 | bne .Loop_neon |
| 485 | |
| 486 | #ifdef __ARMEL__ |
| 487 | vrev64.8 $Xl,$Xl |
| 488 | #endif |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 489 | sub $Xi,#16 |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 490 | vst1.64 $Xl#hi,[$Xi]! @ write out Xi |
| 491 | vst1.64 $Xl#lo,[$Xi] |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 492 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 493 | ret @ bx lr |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 494 | .size gcm_ghash_neon,.-gcm_ghash_neon |
| 495 | #endif |
| 496 | ___ |
| 497 | } |
| 498 | $code.=<<___; |
| 499 | .asciz "GHASH for ARMv4/NEON, CRYPTOGAMS by <appro\@openssl.org>" |
| 500 | .align 2 |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 501 | ___ |
| 502 | |
| 503 | foreach (split("\n",$code)) { |
| 504 | s/\`([^\`]*)\`/eval $1/geo; |
| 505 | |
| 506 | s/\bq([0-9]+)#(lo|hi)/sprintf "d%d",2*$1+($2 eq "hi")/geo or |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 507 | s/\bret\b/bx lr/go or |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 508 | s/\bbx\s+lr\b/.word\t0xe12fff1e/go; # make it possible to compile with -march=armv4 |
| 509 | |
| 510 | print $_,"\n"; |
| 511 | } |
| 512 | close STDOUT; # enforce flush |