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Rev: nettle/x86/camellia-crypt-internal.asm:1.1

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+C -*- mode: asm; asm-comment-char: ?C; -*-  
+C nettle, low-level cryptographics library
+C 
+C Copyright (C) 2010, Niels Möller
+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 Register usage:
+
+C Camellia state, 128-bit value in little endian order.
+C L0, H0 corresponds to D1 in the spec and i0 in the C implementation.
+C while L1, H1 corresponds to D2/i1.
+define(<L0>,<%eax>)
+define(<H0>,<%ebx>)
+define(<L1>,<%ecx>)
+define(<H1>,<%edx>)
+
+define(<TMP>,<%ebp>)
+define(<KEY>,<%esi>)
+define(<T>,<%edi>)
+
+C Locals on the stack
+
+define(<FRAME_L0>,	<(%esp)>)
+define(<FRAME_H0>,	<4(%esp)>)
+define(<FRAME_L1>,	<8(%esp)>)
+define(<FRAME_H1>,	<12(%esp)>)
+define(<FRAME_CNT>,	<16(%esp)>)
+	
+C Arguments on stack.
+define(<FRAME_CTX>,	<40(%esp)>)
+define(<FRAME_TABLE>,	<44(%esp)>)
+define(<FRAME_LENGTH>,	<48(%esp)>)
+define(<FRAME_DST>,	<52(%esp)>)
+define(<FRAME_SRC>,	<56(%esp)>)
+
+define(<SP1110>, <(T,$1,4)>)
+define(<SP0222>, <1024(T,$1,4)>)
+define(<SP3033>, <2048(T,$1,4)>)
+define(<SP4404>, <3072(T,$1,4)>)
+
+C ROUND(xl, xh, yl, yh, key-offset)
+C xl and xh are rotated 16 bits at the end
+C yl and yh are read from stack, and left in registers
+define(<ROUND>, <
+	movzbl	LREG($1), TMP
+	movl	SP1110(TMP), $4
+	movzbl	HREG($1), TMP
+	xorl	SP4404(TMP), $4
+	roll	<$>16, $1
+
+	movzbl	LREG($2), TMP
+	movl	SP4404(TMP), $3
+	movzbl	HREG($2), TMP
+	xorl	SP3033(TMP), $3
+	roll	<$>16, $2
+
+	movzbl	LREG($1), TMP
+	xorl	SP3033(TMP), $4
+	movzbl	HREG($1), TMP
+	xorl	SP0222(TMP), $4
+
+	movzbl	LREG($2), TMP
+	xorl	SP0222(TMP), $3
+	movzbl	HREG($2), TMP
+	xorl	SP1110(TMP), $3
+
+	xorl	$5(KEY), $4
+	xorl	$5 + 4(KEY), $3
+
+	xorl	$3, $4
+	rorl	<$>8, $3
+	xorl	$4, $3
+
+	xorl	FRAME_$3, $3
+	xorl	FRAME_$4, $4
+>)
+
+C Six rounds, with inputs and outputs in registers.
+define(<ROUND6>, <
+	movl	L0, FRAME_L0
+	movl	H0, FRAME_H0
+	movl	L1, FRAME_L1
+	movl	H1, FRAME_H1
+
+	ROUND(L0,H0,<L1>,<H1>,0)
+	movl	L1, FRAME_L1
+	movl	H1, FRAME_H1
+	ROUND(L1,H1,<L0>,<H0>,8)
+	movl	L0, FRAME_L0
+	movl	H0, FRAME_H0
+	ROUND(L0,H0,<L1>,<H1>,16)
+	movl	L1, FRAME_L1
+	movl	H1, FRAME_H1
+	ROUND(L1,H1,<L0>,<H0>,24)
+	movl	L0, FRAME_L0
+	movl	H0, FRAME_H0
+	ROUND(L0,H0,<L1>,<H1>,32)
+	ROUND(L1,H1,<L0>,<H0>,40)
+	roll	<$>16, L1
+	roll	<$>16, H1
+>)
+
+C FL(x0, x1, key-offset)
+define(<FL>, <
+	movl	$3 + 4(KEY), TMP
+	andl	$2, TMP
+	roll	<$>1, TMP
+	xorl	TMP, $1
+	movl	$3(KEY), TMP
+	orl	$1, TMP
+	xorl	TMP, $2
+>)
+C FLINV(x0, x1, key-offset)
+define(<FLINV>, <
+	movl	$3(KEY), TMP
+	orl	$1, TMP
+	xorl	TMP, $2
+	movl	$3 + 4(KEY), TMP
+	andl	$2, TMP
+	roll	<$>1, TMP
+	xorl	TMP, $1
+>)
+
+.file "camellia-encrypt-internal.asm"
+	
+	C _camellia_crypt(struct camellia_context *ctx, 
+	C	          const struct camellia_table *T,
+	C	          unsigned length, uint8_t *dst,
+	C	          uint8_t *src)
+	.text
+	ALIGN(4)
+PROLOGUE(_nettle_camellia_crypt)
+	C save all registers that need to be saved
+	pushl	%ebx		C  32(%esp)
+	pushl	%ebp		C  28(%esp)
+	pushl	%esi		C  24(%esp)
+	pushl	%edi		C  20(%esp)
+
+	subl	$20, %esp 
+
+	movl	FRAME_LENGTH, %ebp
+	testl	%ebp,%ebp
+	jz	.Lend
+
+.Lblock_loop:
+	C Load data, note that we'll happily do unaligned loads
+	movl	FRAME_SRC, TMP
+	movl	(TMP), H0
+	bswap	H0
+	movl	4(TMP), L0
+	bswap	L0
+	movl	8(TMP), H1
+	bswap	H1
+	movl	12(TMP), L1
+	bswap	L1
+	addl	$16, FRAME_SRC
+	movl	FRAME_CTX, KEY
+	movl	(KEY), TMP
+	subl	$8, TMP
+	mov	TMP, FRAME_CNT
+	C 	Whitening using first subkey 
+	xor	4(KEY), L0
+	xor	8(KEY), H0
+	add	$12, KEY
+
+	movl	FRAME_TABLE, T
+
+	ROUND6
+.Lround_loop:
+	add	$64, KEY
+	FL(L0, H0, -16)
+	FLINV(L1, H1, -8)
+	ROUND6
+	sub 	$8, FRAME_CNT	
+	ja	.Lround_loop
+
+	movl	FRAME_DST, TMP
+	bswap	H0
+	movl	H0,8(TMP)
+	bswap	L0
+	movl	L0,12(TMP)
+	xorl	52(KEY), H1
+	bswap	H1
+	movl	H1, 0(TMP)
+	xorl	48(KEY), L1
+	bswap	L1
+	movl	L1, 4(TMP)
+	addl	$16, FRAME_DST
+	subl	$16, FRAME_LENGTH
+	ja	.Lblock_loop
+
+.Lend:
+	addl	$20, %esp
+	popl	%edi
+	popl	%esi
+	popl	%ebp
+	popl	%ebx
+	ret
+EPILOGUE(_nettle_camellia_crypt)