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Diffstat (limited to 'x86/arcfour-crypt.asm')
| -rw-r--r-- | x86/arcfour-crypt.asm | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/x86/arcfour-crypt.asm b/x86/arcfour-crypt.asm deleted file mode 100644 index e03df8e9..00000000 --- a/x86/arcfour-crypt.asm +++ /dev/null @@ -1,125 +0,0 @@ -C x86/arcfour-crypt.asm - -ifelse(` - Copyright (C) 2004, Niels Möller - - This file is part of GNU Nettle. - - GNU Nettle is free software: you can redistribute it and/or - modify it under the terms of either: - - * the GNU Lesser General Public License as published by the Free - Software Foundation; either version 3 of the License, or (at your - option) any later version. - - or - - * the GNU General Public License as published by the Free - Software Foundation; either version 2 of the License, or (at your - option) any later version. - - or both in parallel, as here. - - GNU Nettle is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received copies of the GNU General Public License and - the GNU Lesser General Public License along with this program. If - not, see http://www.gnu.org/licenses/. -') - - .file "arcfour-crypt.asm" - - C arcfour_crypt(struct arcfour_ctx *ctx, - C size_t length, uint8_t *dst, - C const uint8_t *src) - .text - ALIGN(16) -PROLOGUE(nettle_arcfour_crypt) - C save all registers that need to be saved - pushl %ebx C 12(%esp) - pushl %ebp C 8(%esp) - pushl %esi C 4(%esp) - pushl %edi C 0(%esp) - -C Input arguments: - C ctx = 20(%esp) - C length = 24(%esp) - C dst = 28(%esp) - C src = 32(%esp) -C Register usage: - C %ebp = ctx - C %esi = src - C %edi = dst - C %edx = loop counter - C %eax = i - C %ebx = j - C %cl = si - C %ch = sj - - movl 24(%esp), %edx C length - movl 20(%esp), %ebp C ctx - movl 28(%esp), %edi C dst - movl 32(%esp), %esi C src - - lea (%edx, %edi), %edi - lea (%edx, %esi), %esi - negl %edx - jnc .Lend - - movzbl ARCFOUR_I (%ebp), %eax C i - movzbl ARCFOUR_J (%ebp), %ebx C j - - incb %al - sarl $1, %edx - jc .Lloop_odd - - ALIGN(16) -.Lloop: - movb (%ebp, %eax), %cl C si. - addb %cl, %bl - movb (%ebp, %ebx), %ch C sj - movb %ch, (%ebp, %eax) C S[i] = sj - incl %eax - movzbl %al, %eax - movb %cl, (%ebp, %ebx) C S[j] = si - addb %ch, %cl - movzbl %cl, %ecx C Clear, so it can be used - C for indexing. - movb (%ebp, %ecx), %cl - xorb (%esi, %edx, 2), %cl - movb %cl, (%edi, %edx, 2) - - C FIXME: Could exchange cl and ch in the second half - C and try to interleave instructions better. -.Lloop_odd: - movb (%ebp, %eax), %cl C si. - addb %cl, %bl - movb (%ebp, %ebx), %ch C sj - movb %ch, (%ebp, %eax) C S[i] = sj - incl %eax - movzbl %al, %eax - movb %cl, (%ebp, %ebx) C S[j] = si - addb %ch, %cl - movzbl %cl, %ecx C Clear, so it can be used - C for indexing. - movb (%ebp, %ecx), %cl - xorb 1(%esi, %edx, 2), %cl - incl %edx - movb %cl, -1(%edi, %edx, 2) - - jnz .Lloop - -C .Lloop_done: - decb %al - movb %al, ARCFOUR_I (%ebp) C Store the new i and j. - movb %bl, ARCFOUR_J (%ebp) -.Lend: - popl %edi - popl %esi - popl %ebp - popl %ebx - ret -EPILOGUE(nettle_arcfour_crypt) |