* sparc/arcfour-crypt.asm: New file.

Rev: src/nettle/sparc/arcfour-crypt.asm:1.1

sparc/arcfour-crypt.asm

+C -*- mode: asm; asm-comment-char: ?C; -*-  
+C nettle, low-level cryptographics library
+C 
+C Copyright (C) 2002, 2005 Niels Mller
+C  
+C The nettle library is free software; you can redistribute it and/or modify
+C it under the terms of the GNU Lesser General Public License as published by
+C the Free Software Foundation; either version 2.1 of the License, or (at your
+C option) any later version.
+C 
+C The nettle library is distributed in the hope that it will be useful, but
+C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+C or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+C License for more details.
+C 
+C You should have received a copy of the GNU Lesser General Public License
+C along with the nettle library; see the file COPYING.LIB.  If not, write to
+C the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+C MA 02111-1307, USA.
+
+C Registers
+
+define(<CTX>,	<%i0>)
+define(<LENGTH>,<%i1>)
+define(<DST>,	<%i2>)
+define(<SRC>,	<%i3>)
+
+define(<I>,	<%i4>)
+define(<J>,	<%i5>)
+define(<SI>,	<%g1>)
+define(<SJ>,	<%g2>)
+define(<TMP>,	<%g3>)
+
+C	FIXME: Consider using the callers window
+
+define(<FRAME_SIZE>, 104)
+
+	.file "arcfour-crypt.asm"
+
+	C arcfour_crypt(struct arcfour_ctx *ctx,
+	C               unsigned 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
+	
+	C	Load both I and J
+	lduw	[CTX + ARCFOUR_I], I
+	and	I, 0xff, J
+	srl	I, 8, I
+
+.Loop:	
+	add	I, 1, I
+	and	I, 0xff, I
+	ldub	[CTX + I], SI
+	add	J, SI, J
+	and	J, 0xff, J
+	ldub	[CTX + J], SJ
+	stb	SJ, [CTX + I]
+	stb	SI, [CTX + J]
+	add	SI, SJ, SI
+	and	SI, 0xff, SI
+	ldub	[CTX + SI], SI
+	ldub	[SRC], TMP
+	xor	TMP, SI, TMP
+	stb	TMP, [DST]
+	subcc	LENGTH,1,LENGTH
+	add	SRC, 1, SRC
+	bne	.Loop
+	add	DST, 1, DST
+
+	C	Save back I and J	
+	sll	I, 8, I
+	or	I, J, I
+	stuw	I, [CTX + ARCFOUR_I]
+
+.Lend:
+	ret
+	restore
+
+EPILOGUE(nettle_arcfour_crypt)
+
+C Some stats from adriana.lysator.liu.se (SS1000$, 85 MHz), for AES 128
+
+C 1:	nettle-1.13 C-code
+
+C	MB/s	cycles/byte	Code size (bytes)
+C 1:	6.6	12.4			132