From 73bdcbe9d3b55c97f54820c1174ef8666c83be45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Sun, 7 Aug 2022 20:34:12 +0200
Subject: [PATCH] Delete all arcfour assembly code
---
ChangeLog | 10 ++
Makefile.in | 2 +-
arcfour-crypt.c | 61 ----------
arcfour.c | 21 ++++
asm.m4 | 6 -
configure.ac | 2 +-
sparc32/arcfour-crypt.asm | 242 --------------------------------------
sparc64/arcfour-crypt.asm | 229 ------------------------------------
x86/arcfour-crypt.asm | 125 --------------------
9 files changed, 33 insertions(+), 665 deletions(-)
delete mode 100644 arcfour-crypt.c
delete mode 100644 sparc32/arcfour-crypt.asm
delete mode 100644 sparc64/arcfour-crypt.asm
delete mode 100644 x86/arcfour-crypt.asm
diff --git a/ChangeLog b/ChangeLog
index e7dbb612..7ce9d354 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2022-08-07 Niels Möller <nisse@lysator.liu.se>
+
+ Delete all arcfour assembly code.
+ * arcfour.c (arcfour_crypt): Moved function here, from...
+ * arcfour-crypt.c: ... deleted file.
+ * sparc32/arcfour-crypt.asm: Deleted.
+ * sparc64/arcfour-crypt.asm: Deleted.
+ * x86/arcfour-crypt.asm: Deleted.
+ * asm.m4: Delete arcfour structure offsets.
+
2022-08-05 Niels Möller <nisse@lysator.liu.se>
* nettle-internal.h: Include stdlib.h, fix alloca warnings on BSD.
diff --git a/Makefile.in b/Makefile.in
index 11c88114..4b4672fa 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -81,7 +81,7 @@ nettle_SOURCES = aes-decrypt-internal.c aes-decrypt.c aes-decrypt-table.c \
aes256-set-encrypt-key.c aes256-set-decrypt-key.c \
aes256-meta.c \
nist-keywrap.c \
- arcfour.c arcfour-crypt.c \
+ arcfour.c \
arctwo.c arctwo-meta.c blowfish.c blowfish-bcrypt.c \
base16-encode.c base16-decode.c base16-meta.c \
base64-encode.c base64-decode.c base64-meta.c \
diff --git a/arcfour-crypt.c b/arcfour-crypt.c
deleted file mode 100644
index 215c556a..00000000
--- a/arcfour-crypt.c
+++ /dev/null
@@ -1,61 +0,0 @@
-/* arcfour-crypt.c
-
- The arcfour/rc4 stream cipher.
-
- Copyright (C) 2001, 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/.
-*/
-
-#if HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <assert.h>
-
-#include "arcfour.h"
-
-void
-arcfour_crypt(struct arcfour_ctx *ctx,
- size_t length, uint8_t *dst,
- const uint8_t *src)
-{
- register uint8_t i, j;
- register int si, sj;
-
- i = ctx->i; j = ctx->j;
- while(length--)
- {
- i++; i &= 0xff;
- si = ctx->S[i];
- j += si; j &= 0xff;
- sj = ctx->S[i] = ctx->S[j];
- ctx->S[j] = si;
- *dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ];
- }
- ctx->i = i; ctx->j = j;
-}
diff --git a/arcfour.c b/arcfour.c
index 87f4959f..795a2d77 100644
--- a/arcfour.c
+++ b/arcfour.c
@@ -69,3 +69,24 @@ arcfour128_set_key(struct arcfour_ctx *ctx, const uint8_t *key)
{
arcfour_set_key (ctx, ARCFOUR128_KEY_SIZE, key);
}
+
+void
+arcfour_crypt(struct arcfour_ctx *ctx,
+ size_t length, uint8_t *dst,
+ const uint8_t *src)
+{
+ register uint8_t i, j;
+ register int si, sj;
+
+ i = ctx->i; j = ctx->j;
+ while(length--)
+ {
+ i++; i &= 0xff;
+ si = ctx->S[i];
+ j += si; j &= 0xff;
+ sj = ctx->S[i] = ctx->S[j];
+ ctx->S[j] = si;
+ *dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ];
+ }
+ ctx->i = i; ctx->j = j;
+}
diff --git a/asm.m4 b/asm.m4
index 60c66c25..2bb1068c 100644
--- a/asm.m4
+++ b/asm.m4
@@ -73,12 +73,6 @@ define(`UCHAR', `STRUCT(`$1', 1)')dnl
dnl UNSIGNED(name)
define(`UNSIGNED', `STRUCT(`$1', 4)')dnl
-dnl Offsets in arcfour_ctx
-STRUCTURE(ARCFOUR)
- STRUCT(S, 256)
- UCHAR(I)
- UCHAR(J)
-
dnl Offsets in aes_table
define(AES_SBOX_SIZE, 256)dnl
define(AES_TABLE_SIZE, 1024)dnl
diff --git a/configure.ac b/configure.ac
index 7a046f11..73ce5764 100644
--- a/configure.ac
+++ b/configure.ac
@@ -591,7 +591,7 @@ asm_replace_list="aes-encrypt-internal.asm aes-decrypt-internal.asm \
aes256-encrypt.asm aes256-decrypt.asm \
cbc-aes128-encrypt.asm cbc-aes192-encrypt.asm \
cbc-aes256-encrypt.asm \
- arcfour-crypt.asm camellia-crypt-internal.asm \
+ camellia-crypt-internal.asm \
md5-compress.asm memxor.asm memxor3.asm \
ghash-set-key.asm ghash-update.asm \
poly1305-internal.asm \
diff --git a/sparc32/arcfour-crypt.asm b/sparc32/arcfour-crypt.asm
deleted file mode 100644
index 0093e550..00000000
--- a/sparc32/arcfour-crypt.asm
+++ /dev/null
@@ -1,242 +0,0 @@
-C sparc32/arcfour-crypt.asm
-
-ifelse(`
- Copyright (C) 2002, 2005 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/.
-')
-
-C Define to YES, to enable the complex code to special case SRC
-C and DST with compatible alignment.
-
-define(`WITH_ALIGN', `YES')
-
-C Registers
-
-define(`CTX', `%i0')
-define(`LENGTH',`%i1')
-define(`DST', `%i2')
-define(`SRC', `%i3')
-
-define(`I1', `%i4')
-define(`I2', `%i5')
-define(`J', `%g1')
-define(`SI', `%g2')
-define(`SJ', `%g3')
-define(`TMP', `%o0')
-define(`TMP2', `%o1')
-define(`N', `%o2')
-define(`DATA', `%o3')
-
-C Computes the next byte of the key stream. As input, i must
-C already point to the index for the current access, the index
-C for the next access is stored in ni. The resulting key byte is
-C stored in res.
-C ARCFOUR_BYTE(i, ni, res)
-define(`ARCFOUR_BYTE', `
- ldub [CTX + $1], SI
- add $1, 1, $2
- add J, SI, J
- and J, 0xff, J
- ldub [CTX + J], SJ
- and $2, 0xff, $2
- stb SI, [CTX + J]
- add SI, SJ, SI
- and SI, 0xff, SI
- stb SJ, [CTX + $1]
- ldub [CTX + SI], $3
-')dnl
-
-C FIXME: Consider using the callers window
-define(`FRAME_SIZE', 104)
-
- .file "arcfour-crypt.asm"
-
- C arcfour_crypt(struct arcfour_ctx *ctx,
- C size_t length, uint8_t *dst,
- C const uint8_t *src)
-
- .section ".text"
- .align 16
- .proc 020
-
-PROLOGUE(nettle_arcfour_crypt)
-
- save %sp, -FRAME_SIZE, %sp
- cmp LENGTH, 0
- be .Lend
- nop
-
- C Load both I and J
- lduh [CTX + ARCFOUR_I], I1
- and I1, 0xff, J
- srl I1, 8, I1
-
- C We want an even address for DST
- andcc DST, 1, %g0
- add I1, 1 ,I1
- beq .Laligned2
- and I1, 0xff, I1
-
- mov I1, I2
- ldub [SRC], DATA
- ARCFOUR_BYTE(I2, I1, TMP)
- subcc LENGTH, 1, LENGTH
- add SRC, 1, SRC
- xor DATA, TMP, DATA
- stb DATA, [DST]
- beq .Ldone
- add DST, 1, DST
-
-.Laligned2:
-
- cmp LENGTH, 2
- blu .Lfinal1
- C Harmless delay slot instruction
- andcc DST, 2, %g0
- beq .Laligned4
- nop
-
- ldub [SRC], DATA
- ARCFOUR_BYTE(I1, I2, TMP)
- ldub [SRC + 1], TMP2
- add SRC, 2, SRC
- xor DATA, TMP, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- subcc LENGTH, 2, LENGTH
- or DATA, TMP, DATA
-
- sth DATA, [DST]
- beq .Ldone
- add DST, 2, DST
-
-.Laligned4:
- cmp LENGTH, 4
- blu .Lfinal2
- C Harmless delay slot instruction
- srl LENGTH, 2, N
-
-.Loop:
- C Main loop, with aligned writes
-
- C FIXME: Could check if SRC is aligned, and
- C use 32-bit reads in that case.
-
- ldub [SRC], DATA
- ARCFOUR_BYTE(I1, I2, TMP)
- ldub [SRC + 1], TMP2
- xor TMP, DATA, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- ldub [SRC + 2], TMP2
- or TMP, DATA, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I1, I2, TMP)
- xor TMP2, TMP, TMP
- ldub [SRC + 3], TMP2
- or TMP, DATA, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- or TMP, DATA, DATA
- subcc N, 1, N
- add SRC, 4, SRC
- st DATA, [DST]
- bne .Loop
- add DST, 4, DST
-
- andcc LENGTH, 3, LENGTH
- beq .Ldone
- nop
-
-.Lfinal2:
- C DST address must be 2-aligned
- cmp LENGTH, 2
- blu .Lfinal1
- nop
-
- ldub [SRC], DATA
- ARCFOUR_BYTE(I1, I2, TMP)
- ldub [SRC + 1], TMP2
- add SRC, 2, SRC
- xor DATA, TMP, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- or DATA, TMP, DATA
-
- sth DATA, [DST]
- beq .Ldone
- add DST, 2, DST
-
-.Lfinal1:
- mov I1, I2
- ldub [SRC], DATA
- ARCFOUR_BYTE(I2, I1, TMP)
- xor DATA, TMP, DATA
- stb DATA, [DST]
-
-.Ldone:
- C Save back I and J
- sll I2, 8, I2
- or I2, J, I2
- stuh I2, [CTX + ARCFOUR_I]
-
-.Lend:
- ret
- restore
-
-EPILOGUE(nettle_arcfour_crypt)
-
-C Some stats from adriana.lysator.liu.se (SS1000E, 85 MHz), for AES 128
-
-C 1: nettle-1.13 C-code
-C 2: First working version of the assembler code
-C 3: Moved load of source byte
-C 4: Better instruction scheduling
-C 5: Special case SRC and DST with compatible alignment
-C 6: After bugfix (reorder of ld [CTX+SI+SJ] and st [CTX + SI])
-C 7: Unrolled only twice, with byte-accesses
-C 8: Unrolled, using 8-bit reads and aligned 32-bit writes.
-
-C MB/s cycles/byte Code size (bytes)
-C 1: 6.6 12.4 132
-C 2: 5.6 14.5 116
-C 3: 6.0 13.5 116
-C 4: 6.5 12.4 116
-C 5: 7.9 10.4 496
-C 6: 8.3 9.7 496
-C 7: 6.7 12.1 268
-C 8: 8.3 9.8 768
diff --git a/sparc64/arcfour-crypt.asm b/sparc64/arcfour-crypt.asm
deleted file mode 100644
index ffb5edf4..00000000
--- a/sparc64/arcfour-crypt.asm
+++ /dev/null
@@ -1,229 +0,0 @@
-C sparc64/arcfour-crypt.asm
-
-ifelse(`
- Copyright (C) 2002, 2005 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/.
-')
-
-C Define to YES, to enable the complex code to special case SRC
-C and DST with compatible alignment.
-
-define(`WITH_ALIGN', `YES')
-
-C Registers
-
-define(`CTX', `%i0')
-define(`LENGTH',`%i1')
-define(`DST', `%i2')
-define(`SRC', `%i3')
-
-define(`I1', `%i4')
-define(`I2', `%i5')
-define(`J', `%g1')
-define(`SI', `%g2')
-define(`SJ', `%g3')
-define(`TMP', `%o0')
-define(`TMP2', `%o1')
-define(`N', `%o2')
-define(`DATA', `%o3')
-
-C Computes the next byte of the key stream. As input, i must
-C already point to the index for the current access, the index
-C for the next access is stored in ni. The resulting key byte is
-C stored in res.
-C ARCFOUR_BYTE(i, ni, res)
-define(`ARCFOUR_BYTE', `
- ldub [CTX + $1], SI
- add $1, 1, $2
- add J, SI, J
- and J, 0xff, J
- ldub [CTX + J], SJ
- and $2, 0xff, $2
- stb SI, [CTX + J]
- add SI, SJ, SI
- and SI, 0xff, SI
- stb SJ, [CTX + $1]
- ldub [CTX + SI], $3
-')dnl
-
-define(`FRAME_SIZE', 192)
-
- .file "arcfour-crypt.asm"
-
- C arcfour_crypt(struct arcfour_ctx *ctx,
- C size_t length, uint8_t *dst,
- C const uint8_t *src)
-
- .section ".text"
- .align 16
- .proc 020
-
-PROLOGUE(nettle_arcfour_crypt)
-
- save %sp, -FRAME_SIZE, %sp
- cmp LENGTH, 0
- be .Lend
- nop
-
- C Load both I and J
- lduh [CTX + ARCFOUR_I], I1
- and I1, 0xff, J
- srl I1, 8, I1
-
- C We want an even address for DST
- andcc DST, 1, %g0
- add I1, 1 ,I1
- beq .Laligned2
- and I1, 0xff, I1
-
- mov I1, I2
- ldub [SRC], DATA
- ARCFOUR_BYTE(I2, I1, TMP)
- subcc LENGTH, 1, LENGTH
- add SRC, 1, SRC
- xor DATA, TMP, DATA
- stb DATA, [DST]
- beq .Ldone
- add DST, 1, DST
-
-.Laligned2:
-
- cmp LENGTH, 2
- blu .Lfinal1
- C Harmless delay slot instruction
- andcc DST, 2, %g0
- beq .Laligned4
- nop
-
- ldub [SRC], DATA
- ARCFOUR_BYTE(I1, I2, TMP)
- ldub [SRC + 1], TMP2
- add SRC, 2, SRC
- xor DATA, TMP, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- subcc LENGTH, 2, LENGTH
- or DATA, TMP, DATA
-
- sth DATA, [DST]
- beq .Ldone
- add DST, 2, DST
-
-.Laligned4:
- cmp LENGTH, 4
- blu .Lfinal2
- C Harmless delay slot instruction
- srl LENGTH, 2, N
-
-.Loop:
- C Main loop, with aligned writes
-
- C FIXME: Could check if SRC is aligned, and
- C use 32-bit reads in that case.
-
- ldub [SRC], DATA
- ARCFOUR_BYTE(I1, I2, TMP)
- ldub [SRC + 1], TMP2
- xor TMP, DATA, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- ldub [SRC + 2], TMP2
- or TMP, DATA, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I1, I2, TMP)
- xor TMP2, TMP, TMP
- ldub [SRC + 3], TMP2
- or TMP, DATA, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- or TMP, DATA, DATA
- subcc N, 1, N
- add SRC, 4, SRC
- st DATA, [DST]
- bne .Loop
- add DST, 4, DST
-
- andcc LENGTH, 3, LENGTH
- beq .Ldone
- nop
-
-.Lfinal2:
- C DST address must be 2-aligned
- cmp LENGTH, 2
- blu .Lfinal1
- nop
-
- ldub [SRC], DATA
- ARCFOUR_BYTE(I1, I2, TMP)
- ldub [SRC + 1], TMP2
- add SRC, 2, SRC
- xor DATA, TMP, DATA
- sll DATA, 8, DATA
-
- ARCFOUR_BYTE(I2, I1, TMP)
- xor TMP2, TMP, TMP
- or DATA, TMP, DATA
-
- sth DATA, [DST]
- beq .Ldone
- add DST, 2, DST
-
-.Lfinal1:
- mov I1, I2
- ldub [SRC], DATA
- ARCFOUR_BYTE(I2, I1, TMP)
- xor DATA, TMP, DATA
- stb DATA, [DST]
-
-.Ldone:
- C Save back I and J
- sll I2, 8, I2
- or I2, J, I2
- stuh I2, [CTX + ARCFOUR_I]
-
-.Lend:
- ret
- restore
-
-EPILOGUE(nettle_arcfour_crypt)
-
-C Stats for AES 128 on sellafield.lysator.liu.se (UE450, 296 MHz)
-
-C 1: nettle-1.13 C-code
-C 2: New assembler code (basically the same as for sparc32)
-
-C MB/s cycles/byte
-C 1: 3.6 77.7
-C 2: 21.8 13.0
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)
--
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