crypto: x86 - Add optimized MORUS implementations

This patch adds optimized implementations of MORUS-640 and MORUS-1280,
utilizing the SSE2 and AVX2 x86 extensions.

For MORUS-1280 (which operates on 256-bit blocks) we provide both AVX2
and SSE2 implementation. Although SSE2 MORUS-1280 is slower than AVX2
MORUS-1280, it is comparable in speed to the SSE2 MORUS-640.

Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 895 insertions, 0 deletions

diff --git a/arch/x86/crypto/morus1280-sse2-asm.S b/arch/x86/crypto/morus1280-sse2-asm.S
new file mode 100644
index 000000000000..1fe637c7be9d
--- /dev/null
+++ b/arch/x86/crypto/morus1280-sse2-asm.S
@@ -0,0 +1,895 @@
+/*
+ * SSE2 implementation of MORUS-1280
+ *
+ * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
+ * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/frame.h>
+
+#define SHUFFLE_MASK(i0, i1, i2, i3) \
+	(i0 | (i1 << 2) | (i2 << 4) | (i3 << 6))
+
+#define MASK2 SHUFFLE_MASK(2, 3, 0, 1)
+
+#define STATE0_LO	%xmm0
+#define STATE0_HI	%xmm1
+#define STATE1_LO	%xmm2
+#define STATE1_HI	%xmm3
+#define STATE2_LO	%xmm4
+#define STATE2_HI	%xmm5
+#define STATE3_LO	%xmm6
+#define STATE3_HI	%xmm7
+#define STATE4_LO	%xmm8
+#define STATE4_HI	%xmm9
+#define KEY_LO		%xmm10
+#define KEY_HI		%xmm11
+#define MSG_LO		%xmm10
+#define MSG_HI		%xmm11
+#define T0_LO		%xmm12
+#define T0_HI		%xmm13
+#define T1_LO		%xmm14
+#define T1_HI		%xmm15
+
+.section .rodata.cst16.morus640_const, "aM", @progbits, 16
+.align 16
+.Lmorus640_const_0:
+	.byte 0x00, 0x01, 0x01, 0x02, 0x03, 0x05, 0x08, 0x0d
+	.byte 0x15, 0x22, 0x37, 0x59, 0x90, 0xe9, 0x79, 0x62
+.Lmorus640_const_1:
+	.byte 0xdb, 0x3d, 0x18, 0x55, 0x6d, 0xc2, 0x2f, 0xf1
+	.byte 0x20, 0x11, 0x31, 0x42, 0x73, 0xb5, 0x28, 0xdd
+
+.section .rodata.cst16.morus640_counter, "aM", @progbits, 16
+.align 16
+.Lmorus640_counter_0:
+	.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07
+	.byte 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
+.Lmorus640_counter_1:
+	.byte 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17
+	.byte 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
+
+.text
+
+.macro rol1 hi, lo
+	/*
+	 * HI_1 | HI_0 || LO_1 | LO_0
+	 *  ==>
+	 * HI_0 | HI_1 || LO_1 | LO_0
+	 *  ==>
+	 * HI_0 | LO_1 || LO_0 | HI_1
+	 */
+	pshufd $MASK2, \hi, \hi
+	movdqa \hi, T0_LO
+	punpcklqdq \lo, T0_LO
+	punpckhqdq \hi, \lo
+	movdqa \lo, \hi
+	movdqa T0_LO, \lo
+.endm
+
+.macro rol2 hi, lo
+	movdqa \lo, T0_LO
+	movdqa \hi, \lo
+	movdqa T0_LO, \hi
+.endm
+
+.macro rol3 hi, lo
+	/*
+	 * HI_1 | HI_0 || LO_1 | LO_0
+	 *  ==>
+	 * HI_0 | HI_1 || LO_1 | LO_0
+	 *  ==>
+	 * LO_0 | HI_1 || HI_0 | LO_1
+	 */
+	pshufd $MASK2, \hi, \hi
+	movdqa \lo, T0_LO
+	punpckhqdq \hi, T0_LO
+	punpcklqdq \lo, \hi
+	movdqa T0_LO, \lo
+.endm
+
+.macro morus1280_round s0_l, s0_h, s1_l, s1_h, s2_l, s2_h, s3_l, s3_h, s4_l, s4_h, b, w
+	movdqa \s1_l, T0_LO
+	pand \s2_l, T0_LO
+	pxor T0_LO, \s0_l
+
+	movdqa \s1_h, T0_LO
+	pand \s2_h, T0_LO
+	pxor T0_LO, \s0_h
+
+	pxor \s3_l, \s0_l
+	pxor \s3_h, \s0_h
+
+	movdqa \s0_l, T0_LO
+	psllq $\b, T0_LO
+	psrlq $(64 - \b), \s0_l
+	pxor T0_LO, \s0_l
+
+	movdqa \s0_h, T0_LO
+	psllq $\b, T0_LO
+	psrlq $(64 - \b), \s0_h
+	pxor T0_LO, \s0_h
+
+	\w \s3_h, \s3_l
+.endm
+
+/*
+ * __morus1280_update: internal ABI
+ * input:
+ *   STATE[0-4] - input state
+ *   MSG        - message block
+ * output:
+ *   STATE[0-4] - output state
+ * changed:
+ *   T0
+ */
+__morus1280_update:
+	morus1280_round \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		13, rol1
+	pxor MSG_LO, STATE1_LO
+	pxor MSG_HI, STATE1_HI
+	morus1280_round \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		46, rol2
+	pxor MSG_LO, STATE2_LO
+	pxor MSG_HI, STATE2_HI
+	morus1280_round \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		38, rol3
+	pxor MSG_LO, STATE3_LO
+	pxor MSG_HI, STATE3_HI
+	morus1280_round \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		7, rol2
+	pxor MSG_LO, STATE4_LO
+	pxor MSG_HI, STATE4_HI
+	morus1280_round \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		4, rol1
+	ret
+ENDPROC(__morus1280_update)
+
+/*
+ * __morus1280_update_zero: internal ABI
+ * input:
+ *   STATE[0-4] - input state
+ * output:
+ *   STATE[0-4] - output state
+ * changed:
+ *   T0
+ */
+__morus1280_update_zero:
+	morus1280_round \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		13, rol1
+	morus1280_round \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		46, rol2
+	morus1280_round \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		38, rol3
+	morus1280_round \
+		STATE3_LO, STATE3_HI, \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		7, rol2
+	morus1280_round \
+		STATE4_LO, STATE4_HI, \
+		STATE0_LO, STATE0_HI, \
+		STATE1_LO, STATE1_HI, \
+		STATE2_LO, STATE2_HI, \
+		STATE3_LO, STATE3_HI, \
+		4, rol1
+	ret
+ENDPROC(__morus1280_update_zero)
+
+/*
+ * __load_partial: internal ABI
+ * input:
+ *   %rsi - src
+ *   %rcx - bytes
+ * output:
+ *   MSG  - message block
+ * changed:
+ *   %r8
+ *   %r9
+ */
+__load_partial:
+	xor %r9, %r9
+	pxor MSG_LO, MSG_LO
+	pxor MSG_HI, MSG_HI
+
+	mov %rcx, %r8
+	and $0x1, %r8
+	jz .Lld_partial_1
+
+	mov %rcx, %r8
+	and $0x1E, %r8
+	add %rsi, %r8
+	mov (%r8), %r9b
+
+.Lld_partial_1:
+	mov %rcx, %r8
+	and $0x2, %r8
+	jz .Lld_partial_2
+
+	mov %rcx, %r8
+	and $0x1C, %r8
+	add %rsi, %r8
+	shl $16, %r9
+	mov (%r8), %r9w
+
+.Lld_partial_2:
+	mov %rcx, %r8
+	and $0x4, %r8
+	jz .Lld_partial_4
+
+	mov %rcx, %r8
+	and $0x18, %r8
+	add %rsi, %r8
+	shl $32, %r9
+	mov (%r8), %r8d
+	xor %r8, %r9
+
+.Lld_partial_4:
+	movq %r9, MSG_LO
+
+	mov %rcx, %r8
+	and $0x8, %r8
+	jz .Lld_partial_8
+
+	mov %rcx, %r8
+	and $0x10, %r8
+	add %rsi, %r8
+	pslldq $8, MSG_LO
+	movq (%r8), T0_LO
+	pxor T0_LO, MSG_LO
+
+.Lld_partial_8:
+	mov %rcx, %r8
+	and $0x10, %r8
+	jz .Lld_partial_16
+
+	movdqa MSG_LO, MSG_HI
+	movdqu (%rsi), MSG_LO
+
+.Lld_partial_16:
+	ret
+ENDPROC(__load_partial)
+
+/*
+ * __store_partial: internal ABI
+ * input:
+ *   %rdx - dst
+ *   %rcx - bytes
+ * output:
+ *   T0   - message block
+ * changed:
+ *   %r8
+ *   %r9
+ *   %r10
+ */
+__store_partial:
+	mov %rcx, %r8
+	mov %rdx, %r9
+
+	cmp $16, %r8
+	jl .Lst_partial_16
+
+	movdqu T0_LO, (%r9)
+	movdqa T0_HI, T0_LO
+
+	sub $16, %r8
+	add $16, %r9
+
+.Lst_partial_16:
+	movq T0_LO, %r10
+
+	cmp $8, %r8
+	jl .Lst_partial_8
+
+	mov %r10, (%r9)
+	psrldq $8, T0_LO
+	movq T0_LO, %r10
+
+	sub $8, %r8
+	add $8, %r9
+
+.Lst_partial_8:
+	cmp $4, %r8
+	jl .Lst_partial_4
+
+	mov %r10d, (%r9)
+	shr $32, %r10
+
+	sub $4, %r8
+	add $4, %r9
+
+.Lst_partial_4:
+	cmp $2, %r8
+	jl .Lst_partial_2
+
+	mov %r10w, (%r9)
+	shr $16, %r10
+
+	sub $2, %r8
+	add $2, %r9
+
+.Lst_partial_2:
+	cmp $1, %r8
+	jl .Lst_partial_1
+
+	mov %r10b, (%r9)
+
+.Lst_partial_1:
+	ret
+ENDPROC(__store_partial)
+
+/*
+ * void crypto_morus1280_sse2_init(void *state, const void *key,
+ *                                 const void *iv);
+ */
+ENTRY(crypto_morus1280_sse2_init)
+	FRAME_BEGIN
+
+	/* load IV: */
+	pxor STATE0_HI, STATE0_HI
+	movdqu (%rdx), STATE0_LO
+	/* load key: */
+	movdqu  0(%rsi), KEY_LO
+	movdqu 16(%rsi), KEY_HI
+	movdqa KEY_LO, STATE1_LO
+	movdqa KEY_HI, STATE1_HI
+	/* load all ones: */
+	pcmpeqd STATE2_LO, STATE2_LO
+	pcmpeqd STATE2_HI, STATE2_HI
+	/* load all zeros: */
+	pxor STATE3_LO, STATE3_LO
+	pxor STATE3_HI, STATE3_HI
+	/* load the constant: */
+	movdqa .Lmorus640_const_0, STATE4_LO
+	movdqa .Lmorus640_const_1, STATE4_HI
+
+	/* update 16 times with zero: */
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+	call __morus1280_update_zero
+
+	/* xor-in the key again after updates: */
+	pxor KEY_LO, STATE1_LO
+	pxor KEY_HI, STATE1_HI
+
+	/* store the state: */
+	movdqu STATE0_LO, (0 * 16)(%rdi)
+	movdqu STATE0_HI, (1 * 16)(%rdi)
+	movdqu STATE1_LO, (2 * 16)(%rdi)
+	movdqu STATE1_HI, (3 * 16)(%rdi)
+	movdqu STATE2_LO, (4 * 16)(%rdi)
+	movdqu STATE2_HI, (5 * 16)(%rdi)
+	movdqu STATE3_LO, (6 * 16)(%rdi)
+	movdqu STATE3_HI, (7 * 16)(%rdi)
+	movdqu STATE4_LO, (8 * 16)(%rdi)
+	movdqu STATE4_HI, (9 * 16)(%rdi)
+
+	FRAME_END
+	ret
+ENDPROC(crypto_morus1280_sse2_init)
+
+/*
+ * void crypto_morus1280_sse2_ad(void *state, const void *data,
+ *                               unsigned int length);
+ */
+ENTRY(crypto_morus1280_sse2_ad)
+	FRAME_BEGIN
+
+	cmp $32, %rdx
+	jb .Lad_out
+
+	/* load the state: */
+	movdqu (0 * 16)(%rdi), STATE0_LO
+	movdqu (1 * 16)(%rdi), STATE0_HI
+	movdqu (2 * 16)(%rdi), STATE1_LO
+	movdqu (3 * 16)(%rdi), STATE1_HI
+	movdqu (4 * 16)(%rdi), STATE2_LO
+	movdqu (5 * 16)(%rdi), STATE2_HI
+	movdqu (6 * 16)(%rdi), STATE3_LO
+	movdqu (7 * 16)(%rdi), STATE3_HI
+	movdqu (8 * 16)(%rdi), STATE4_LO
+	movdqu (9 * 16)(%rdi), STATE4_HI
+
+	mov %rsi, %r8
+	and $0xF, %r8
+	jnz .Lad_u_loop
+
+.align 4
+.Lad_a_loop:
+	movdqa  0(%rsi), MSG_LO
+	movdqa 16(%rsi), MSG_HI
+	call __morus1280_update
+	sub $32, %rdx
+	add $32, %rsi
+	cmp $32, %rdx
+	jge .Lad_a_loop
+
+	jmp .Lad_cont
+.align 4
+.Lad_u_loop:
+	movdqu  0(%rsi), MSG_LO
+	movdqu 16(%rsi), MSG_HI
+	call __morus1280_update
+	sub $32, %rdx
+	add $32, %rsi
+	cmp $32, %rdx
+	jge .Lad_u_loop
+
+.Lad_cont:
+	/* store the state: */
+	movdqu STATE0_LO, (0 * 16)(%rdi)
+	movdqu STATE0_HI, (1 * 16)(%rdi)
+	movdqu STATE1_LO, (2 * 16)(%rdi)
+	movdqu STATE1_HI, (3 * 16)(%rdi)
+	movdqu STATE2_LO, (4 * 16)(%rdi)
+	movdqu STATE2_HI, (5 * 16)(%rdi)
+	movdqu STATE3_LO, (6 * 16)(%rdi)
+	movdqu STATE3_HI, (7 * 16)(%rdi)
+	movdqu STATE4_LO, (8 * 16)(%rdi)
+	movdqu STATE4_HI, (9 * 16)(%rdi)
+
+.Lad_out:
+	FRAME_END
+	ret
+ENDPROC(crypto_morus1280_sse2_ad)
+
+/*
+ * void crypto_morus1280_sse2_enc(void *state, const void *src, void *dst,
+ *                                unsigned int length);
+ */
+ENTRY(crypto_morus1280_sse2_enc)
+	FRAME_BEGIN
+
+	cmp $32, %rcx
+	jb .Lenc_out
+
+	/* load the state: */
+	movdqu (0 * 16)(%rdi), STATE0_LO
+	movdqu (1 * 16)(%rdi), STATE0_HI
+	movdqu (2 * 16)(%rdi), STATE1_LO
+	movdqu (3 * 16)(%rdi), STATE1_HI
+	movdqu (4 * 16)(%rdi), STATE2_LO
+	movdqu (5 * 16)(%rdi), STATE2_HI
+	movdqu (6 * 16)(%rdi), STATE3_LO
+	movdqu (7 * 16)(%rdi), STATE3_HI
+	movdqu (8 * 16)(%rdi), STATE4_LO
+	movdqu (9 * 16)(%rdi), STATE4_HI
+
+	mov %rsi, %r8
+	or  %rdx, %r8
+	and $0xF, %r8
+	jnz .Lenc_u_loop
+
+.align 4
+.Lenc_a_loop:
+	movdqa  0(%rsi), MSG_LO
+	movdqa 16(%rsi), MSG_HI
+	movdqa STATE1_LO, T1_LO
+	movdqa STATE1_HI, T1_HI
+	rol3 T1_HI, T1_LO
+	movdqa MSG_LO, T0_LO
+	movdqa MSG_HI, T0_HI
+	pxor T1_LO, T0_LO
+	pxor T1_HI, T0_HI
+	pxor STATE0_LO, T0_LO
+	pxor STATE0_HI, T0_HI
+	movdqa STATE2_LO, T1_LO
+	movdqa STATE2_HI, T1_HI
+	pand STATE3_LO, T1_LO
+	pand STATE3_HI, T1_HI
+	pxor T1_LO, T0_LO
+	pxor T1_HI, T0_HI
+	movdqa T0_LO,  0(%rdx)
+	movdqa T0_HI, 16(%rdx)
+
+	call __morus1280_update
+	sub $32, %rcx
+	add $32, %rsi
+	add $32, %rdx
+	cmp $32, %rcx
+	jge .Lenc_a_loop
+
+	jmp .Lenc_cont
+.align 4
+.Lenc_u_loop:
+	movdqu  0(%rsi), MSG_LO
+	movdqu 16(%rsi), MSG_HI
+	movdqa STATE1_LO, T1_LO
+	movdqa STATE1_HI, T1_HI
+	rol3 T1_HI, T1_LO
+	movdqa MSG_LO, T0_LO
+	movdqa MSG_HI, T0_HI
+	pxor T1_LO, T0_LO
+	pxor T1_HI, T0_HI
+	pxor STATE0_LO, T0_LO
+	pxor STATE0_HI, T0_HI
+	movdqa STATE2_LO, T1_LO
+	movdqa STATE2_HI, T1_HI
+	pand STATE3_LO, T1_LO
+	pand STATE3_HI, T1_HI
+	pxor T1_LO, T0_LO
+	pxor T1_HI, T0_HI
+	movdqu T0_LO,  0(%rdx)
+	movdqu T0_HI, 16(%rdx)
+
+	call __morus1280_update
+	sub $32, %rcx
+	add $32, %rsi
+	add $32, %rdx
+	cmp $32, %rcx
+	jge .Lenc_u_loop
+
+.Lenc_cont:
+	/* store the state: */
+	movdqu STATE0_LO, (0 * 16)(%rdi)
+	movdqu STATE0_HI, (1 * 16)(%rdi)
+	movdqu STATE1_LO, (2 * 16)(%rdi)
+	movdqu STATE1_HI, (3 * 16)(%rdi)
+	movdqu STATE2_LO, (4 * 16)(%rdi)
+	movdqu STATE2_HI, (5 * 16)(%rdi)
+	movdqu STATE3_LO, (6 * 16)(%rdi)
+	movdqu STATE3_HI, (7 * 16)(%rdi)
+	movdqu STATE4_LO, (8 * 16)(%rdi)
+	movdqu STATE4_HI, (9 * 16)(%rdi)
+
+.Lenc_out:
+	FRAME_END
+	ret
+ENDPROC(crypto_morus1280_sse2_enc)
+
+/*
+ * void crypto_morus1280_sse2_enc_tail(void *state, const void *src, void *dst,
+ *                                     unsigned int length);
+ */
+ENTRY(crypto_morus1280_sse2_enc_tail)
+	FRAME_BEGIN
+
+	/* load the state: */
+	movdqu (0 * 16)(%rdi), STATE0_LO
+	movdqu (1 * 16)(%rdi), STATE0_HI
+	movdqu (2 * 16)(%rdi), STATE1_LO
+	movdqu (3 * 16)(%rdi), STATE1_HI
+	movdqu (4 * 16)(%rdi), STATE2_LO
+	movdqu (5 * 16)(%rdi), STATE2_HI
+	movdqu (6 * 16)(%rdi), STATE3_LO
+	movdqu (7 * 16)(%rdi), STATE3_HI
+	movdqu (8 * 16)(%rdi), STATE4_LO
+	movdqu (9 * 16)(%rdi), STATE4_HI
+
+	/* encrypt message: */
+	call __load_partial
+
+	movdqa STATE1_LO, T1_LO
+	movdqa STATE1_HI, T1_HI
+	rol3 T1_HI, T1_LO
+	movdqa MSG_LO, T0_LO
+	movdqa MSG_HI, T0_HI
+	pxor T1_LO, T0_LO
+	pxor T1_HI, T0_HI
+	pxor STATE0_LO, T0_LO
+	pxor STATE0_HI, T0_HI
+	movdqa STATE2_LO, T1_LO
+	movdqa STATE2_HI, T1_HI
+	pand STATE3_LO, T1_LO
+	pand STATE3_HI, T1_HI
+	pxor T1_LO, T0_LO
+	pxor T1_HI, T0_HI
+
+	call __store_partial
+
+	call __morus1280_update
+
+	/* store the state: */
+	movdqu STATE0_LO, (0 * 16)(%rdi)
+	movdqu STATE0_HI, (1 * 16)(%rdi)
+	movdqu STATE1_LO, (2 * 16)(%rdi)
+	movdqu STATE1_HI, (3 * 16)(%rdi)
+	movdqu STATE2_LO, (4 * 16)(%rdi)
+	movdqu STATE2_HI, (5 * 16)(%rdi)
+	movdqu STATE3_LO, (6 * 16)(%rdi)
+	movdqu STATE3_HI, (7 * 16)(%rdi)
+	movdqu STATE4_LO, (8 * 16)(%rdi)
+	movdqu STATE4_HI, (9 * 16)(%rdi)
+
+	FRAME_END
+ENDPROC(crypto_morus1280_sse2_enc_tail)
+
+/*
+ * void crypto_morus1280_sse2_dec(void *state, const void *src, void *dst,
+ *                                unsigned int length);
+ */
+ENTRY(crypto_morus1280_sse2_dec)
+	FRAME_BEGIN
+
+	cmp $32, %rcx
+	jb .Ldec_out
+
+	/* load the state: */
+	movdqu (0 * 16)(%rdi), STATE0_LO
+	movdqu (1 * 16)(%rdi), STATE0_HI
+	movdqu (2 * 16)(%rdi), STATE1_LO
+	movdqu (3 * 16)(%rdi), STATE1_HI
+	movdqu (4 * 16)(%rdi), STATE2_LO
+	movdqu (5 * 16)(%rdi), STATE2_HI
+	movdqu (6 * 16)(%rdi), STATE3_LO
+	movdqu (7 * 16)(%rdi), STATE3_HI
+	movdqu (8 * 16)(%rdi), STATE4_LO
+	movdqu (9 * 16)(%rdi), STATE4_HI
+
+	mov %rsi, %r8
+	or  %rdx, %r8
+	and $0xF, %r8
+	jnz .Ldec_u_loop
+
+.align 4
+.Ldec_a_loop:
+	movdqa  0(%rsi), MSG_LO
+	movdqa 16(%rsi), MSG_HI
+	pxor STATE0_LO, MSG_LO
+	pxor STATE0_HI, MSG_HI
+	movdqa STATE1_LO, T1_LO
+	movdqa STATE1_HI, T1_HI
+	rol3 T1_HI, T1_LO
+	pxor T1_LO, MSG_LO
+	pxor T1_HI, MSG_HI
+	movdqa STATE2_LO, T1_LO
+	movdqa STATE2_HI, T1_HI
+	pand STATE3_LO, T1_LO
+	pand STATE3_HI, T1_HI
+	pxor T1_LO, MSG_LO
+	pxor T1_HI, MSG_HI
+	movdqa MSG_LO,  0(%rdx)
+	movdqa MSG_HI, 16(%rdx)
+
+	call __morus1280_update
+	sub $32, %rcx
+	add $32, %rsi
+	add $32, %rdx
+	cmp $32, %rcx
+	jge .Ldec_a_loop
+
+	jmp .Ldec_cont
+.align 4
+.Ldec_u_loop:
+	movdqu  0(%rsi), MSG_LO
+	movdqu 16(%rsi), MSG_HI
+	pxor STATE0_LO, MSG_LO
+	pxor STATE0_HI, MSG_HI
+	movdqa STATE1_LO, T1_LO
+	movdqa STATE1_HI, T1_HI
+	rol3 T1_HI, T1_LO
+	pxor T1_LO, MSG_LO
+	pxor T1_HI, MSG_HI
+	movdqa STATE2_LO, T1_LO
+	movdqa STATE2_HI, T1_HI
+	pand STATE3_LO, T1_LO
+	pand STATE3_HI, T1_HI
+	pxor T1_LO, MSG_LO
+	pxor T1_HI, MSG_HI
+	movdqu MSG_LO,  0(%rdx)
+	movdqu MSG_HI, 16(%rdx)
+
+	call __morus1280_update
+	sub $32, %rcx
+	add $32, %rsi
+	add $32, %rdx
+	cmp $32, %rcx
+	jge .Ldec_u_loop
+
+.Ldec_cont:
+	/* store the state: */
+	movdqu STATE0_LO, (0 * 16)(%rdi)
+	movdqu STATE0_HI, (1 * 16)(%rdi)
+	movdqu STATE1_LO, (2 * 16)(%rdi)
+	movdqu STATE1_HI, (3 * 16)(%rdi)
+	movdqu STATE2_LO, (4 * 16)(%rdi)
+	movdqu STATE2_HI, (5 * 16)(%rdi)
+	movdqu STATE3_LO, (6 * 16)(%rdi)
+	movdqu STATE3_HI, (7 * 16)(%rdi)
+	movdqu STATE4_LO, (8 * 16)(%rdi)
+	movdqu STATE4_HI, (9 * 16)(%rdi)
+
+.Ldec_out:
+	FRAME_END
+	ret
+ENDPROC(crypto_morus1280_sse2_dec)
+
+/*
+ * void crypto_morus1280_sse2_dec_tail(void *state, const void *src, void *dst,
+ *                                     unsigned int length);
+ */
+ENTRY(crypto_morus1280_sse2_dec_tail)
+	FRAME_BEGIN
+
+	/* load the state: */
+	movdqu (0 * 16)(%rdi), STATE0_LO
+	movdqu (1 * 16)(%rdi), STATE0_HI
+	movdqu (2 * 16)(%rdi), STATE1_LO
+	movdqu (3 * 16)(%rdi), STATE1_HI
+	movdqu (4 * 16)(%rdi), STATE2_LO
+	movdqu (5 * 16)(%rdi), STATE2_HI
+	movdqu (6 * 16)(%rdi), STATE3_LO
+	movdqu (7 * 16)(%rdi), STATE3_HI
+	movdqu (8 * 16)(%rdi), STATE4_LO
+	movdqu (9 * 16)(%rdi), STATE4_HI
+
+	/* decrypt message: */
+	call __load_partial
+
+	pxor STATE0_LO, MSG_LO
+	pxor STATE0_HI, MSG_HI
+	movdqa STATE1_LO, T1_LO
+	movdqa STATE1_HI, T1_HI
+	rol3 T1_HI, T1_LO
+	pxor T1_LO, MSG_LO
+	pxor T1_HI, MSG_HI
+	movdqa STATE2_LO, T1_LO
+	movdqa STATE2_HI, T1_HI
+	pand STATE3_LO, T1_LO
+	pand STATE3_HI, T1_HI
+	pxor T1_LO, MSG_LO
+	pxor T1_HI, MSG_HI
+	movdqa MSG_LO, T0_LO
+	movdqa MSG_HI, T0_HI
+
+	call __store_partial
+
+	/* mask with byte count: */
+	movq %rcx, T0_LO
+	punpcklbw T0_LO, T0_LO
+	punpcklbw T0_LO, T0_LO
+	punpcklbw T0_LO, T0_LO
+	punpcklbw T0_LO, T0_LO
+	movdqa T0_LO, T0_HI
+	movdqa .Lmorus640_counter_0, T1_LO
+	movdqa .Lmorus640_counter_1, T1_HI
+	pcmpgtb T1_LO, T0_LO
+	pcmpgtb T1_HI, T0_HI
+	pand T0_LO, MSG_LO
+	pand T0_HI, MSG_HI
+
+	call __morus1280_update
+
+	/* store the state: */
+	movdqu STATE0_LO, (0 * 16)(%rdi)
+	movdqu STATE0_HI, (1 * 16)(%rdi)
+	movdqu STATE1_LO, (2 * 16)(%rdi)
+	movdqu STATE1_HI, (3 * 16)(%rdi)
+	movdqu STATE2_LO, (4 * 16)(%rdi)
+	movdqu STATE2_HI, (5 * 16)(%rdi)
+	movdqu STATE3_LO, (6 * 16)(%rdi)
+	movdqu STATE3_HI, (7 * 16)(%rdi)
+	movdqu STATE4_LO, (8 * 16)(%rdi)
+	movdqu STATE4_HI, (9 * 16)(%rdi)
+
+	FRAME_END
+	ret
+ENDPROC(crypto_morus1280_sse2_dec_tail)
+
+/*
+ * void crypto_morus1280_sse2_final(void *state, void *tag_xor,
+ *                                  u64 assoclen, u64 cryptlen);
+ */
+ENTRY(crypto_morus1280_sse2_final)
+	FRAME_BEGIN
+
+	/* load the state: */
+	movdqu (0 * 16)(%rdi), STATE0_LO
+	movdqu (1 * 16)(%rdi), STATE0_HI
+	movdqu (2 * 16)(%rdi), STATE1_LO
+	movdqu (3 * 16)(%rdi), STATE1_HI
+	movdqu (4 * 16)(%rdi), STATE2_LO
+	movdqu (5 * 16)(%rdi), STATE2_HI
+	movdqu (6 * 16)(%rdi), STATE3_LO
+	movdqu (7 * 16)(%rdi), STATE3_HI
+	movdqu (8 * 16)(%rdi), STATE4_LO
+	movdqu (9 * 16)(%rdi), STATE4_HI
+
+	/* xor state[0] into state[4]: */
+	pxor STATE0_LO, STATE4_LO
+	pxor STATE0_HI, STATE4_HI
+
+	/* prepare length block: */
+	movq %rdx, MSG_LO
+	movq %rcx, T0_LO
+	pslldq $8, T0_LO
+	pxor T0_LO, MSG_LO
+	psllq $3, MSG_LO /* multiply by 8 (to get bit count) */
+	pxor MSG_HI, MSG_HI
+
+	/* update state: */
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+	call __morus1280_update
+
+	/* xor tag: */
+	movdqu  0(%rsi), MSG_LO
+	movdqu 16(%rsi), MSG_HI
+
+	pxor STATE0_LO, MSG_LO
+	pxor STATE0_HI, MSG_HI
+	movdqa STATE1_LO, T0_LO
+	movdqa STATE1_HI, T0_HI
+	rol3 T0_HI, T0_LO
+	pxor T0_LO, MSG_LO
+	pxor T0_HI, MSG_HI
+	movdqa STATE2_LO, T0_LO
+	movdqa STATE2_HI, T0_HI
+	pand STATE3_LO, T0_LO
+	pand STATE3_HI, T0_HI
+	pxor T0_LO, MSG_LO
+	pxor T0_HI, MSG_HI
+
+	movdqu MSG_LO,  0(%rsi)
+	movdqu MSG_HI, 16(%rsi)
+
+	FRAME_END
+	ret
+ENDPROC(crypto_morus1280_sse2_final)