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-rw-r--r--arch/x86/crypto/aegis128-aesni-asm.S749
1 files changed, 749 insertions, 0 deletions
diff --git a/arch/x86/crypto/aegis128-aesni-asm.S b/arch/x86/crypto/aegis128-aesni-asm.S
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index 000000000000..9254e0b6cc06
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+++ b/arch/x86/crypto/aegis128-aesni-asm.S
@@ -0,0 +1,749 @@
+/*
+ * AES-NI + SSE2 implementation of AEGIS-128
+ *
+ * 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 STATE0 %xmm0
+#define STATE1 %xmm1
+#define STATE2 %xmm2
+#define STATE3 %xmm3
+#define STATE4 %xmm4
+#define KEY %xmm5
+#define MSG %xmm5
+#define T0 %xmm6
+#define T1 %xmm7
+
+#define STATEP %rdi
+#define LEN %rsi
+#define SRC %rdx
+#define DST %rcx
+
+.section .rodata.cst16.aegis128_const, "aM", @progbits, 32
+.align 16
+.Laegis128_const_0:
+ .byte 0x00, 0x01, 0x01, 0x02, 0x03, 0x05, 0x08, 0x0d
+ .byte 0x15, 0x22, 0x37, 0x59, 0x90, 0xe9, 0x79, 0x62
+.Laegis128_const_1:
+ .byte 0xdb, 0x3d, 0x18, 0x55, 0x6d, 0xc2, 0x2f, 0xf1
+ .byte 0x20, 0x11, 0x31, 0x42, 0x73, 0xb5, 0x28, 0xdd
+
+.section .rodata.cst16.aegis128_counter, "aM", @progbits, 16
+.align 16
+.Laegis128_counter:
+ .byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07
+ .byte 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
+
+.text
+
+/*
+ * aegis128_update
+ * input:
+ * STATE[0-4] - input state
+ * output:
+ * STATE[0-4] - output state (shifted positions)
+ * changed:
+ * T0
+ */
+.macro aegis128_update
+ movdqa STATE4, T0
+ aesenc STATE0, STATE4
+ aesenc STATE1, STATE0
+ aesenc STATE2, STATE1
+ aesenc STATE3, STATE2
+ aesenc T0, STATE3
+.endm
+
+/*
+ * __load_partial: internal ABI
+ * input:
+ * LEN - bytes
+ * SRC - src
+ * output:
+ * MSG - message block
+ * changed:
+ * T0
+ * %r8
+ * %r9
+ */
+__load_partial:
+ xor %r9, %r9
+ pxor MSG, MSG
+
+ mov LEN, %r8
+ and $0x1, %r8
+ jz .Lld_partial_1
+
+ mov LEN, %r8
+ and $0x1E, %r8
+ add SRC, %r8
+ mov (%r8), %r9b
+
+.Lld_partial_1:
+ mov LEN, %r8
+ and $0x2, %r8
+ jz .Lld_partial_2
+
+ mov LEN, %r8
+ and $0x1C, %r8
+ add SRC, %r8
+ shl $0x10, %r9
+ mov (%r8), %r9w
+
+.Lld_partial_2:
+ mov LEN, %r8
+ and $0x4, %r8
+ jz .Lld_partial_4
+
+ mov LEN, %r8
+ and $0x18, %r8
+ add SRC, %r8
+ shl $32, %r9
+ mov (%r8), %r8d
+ xor %r8, %r9
+
+.Lld_partial_4:
+ movq %r9, MSG
+
+ mov LEN, %r8
+ and $0x8, %r8
+ jz .Lld_partial_8
+
+ mov LEN, %r8
+ and $0x10, %r8
+ add SRC, %r8
+ pslldq $8, MSG
+ movq (%r8), T0
+ pxor T0, MSG
+
+.Lld_partial_8:
+ ret
+ENDPROC(__load_partial)
+
+/*
+ * __store_partial: internal ABI
+ * input:
+ * LEN - bytes
+ * DST - dst
+ * output:
+ * T0 - message block
+ * changed:
+ * %r8
+ * %r9
+ * %r10
+ */
+__store_partial:
+ mov LEN, %r8
+ mov DST, %r9
+
+ movq T0, %r10
+
+ cmp $8, %r8
+ jl .Lst_partial_8
+
+ mov %r10, (%r9)
+ psrldq $8, T0
+ movq T0, %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 $0x10, %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_aegis128_aesni_init(void *state, const void *key, const void *iv);
+ */
+ENTRY(crypto_aegis128_aesni_init)
+ FRAME_BEGIN
+
+ /* load IV: */
+ movdqu (%rdx), T1
+
+ /* load key: */
+ movdqa (%rsi), KEY
+ pxor KEY, T1
+ movdqa T1, STATE0
+ movdqa KEY, STATE3
+ movdqa KEY, STATE4
+
+ /* load the constants: */
+ movdqa .Laegis128_const_0, STATE2
+ movdqa .Laegis128_const_1, STATE1
+ pxor STATE2, STATE3
+ pxor STATE1, STATE4
+
+ /* update 10 times with KEY / KEY xor IV: */
+ aegis128_update; pxor KEY, STATE4
+ aegis128_update; pxor T1, STATE3
+ aegis128_update; pxor KEY, STATE2
+ aegis128_update; pxor T1, STATE1
+ aegis128_update; pxor KEY, STATE0
+ aegis128_update; pxor T1, STATE4
+ aegis128_update; pxor KEY, STATE3
+ aegis128_update; pxor T1, STATE2
+ aegis128_update; pxor KEY, STATE1
+ aegis128_update; pxor T1, STATE0
+
+ /* store the state: */
+ movdqu STATE0, 0x00(STATEP)
+ movdqu STATE1, 0x10(STATEP)
+ movdqu STATE2, 0x20(STATEP)
+ movdqu STATE3, 0x30(STATEP)
+ movdqu STATE4, 0x40(STATEP)
+
+ FRAME_END
+ ret
+ENDPROC(crypto_aegis128_aesni_init)
+
+/*
+ * void crypto_aegis128_aesni_ad(void *state, unsigned int length,
+ * const void *data);
+ */
+ENTRY(crypto_aegis128_aesni_ad)
+ FRAME_BEGIN
+
+ cmp $0x10, LEN
+ jb .Lad_out
+
+ /* load the state: */
+ movdqu 0x00(STATEP), STATE0
+ movdqu 0x10(STATEP), STATE1
+ movdqu 0x20(STATEP), STATE2
+ movdqu 0x30(STATEP), STATE3
+ movdqu 0x40(STATEP), STATE4
+
+ mov SRC, %r8
+ and $0xF, %r8
+ jnz .Lad_u_loop
+
+.align 8
+.Lad_a_loop:
+ movdqa 0x00(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE4
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_1
+
+ movdqa 0x10(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE3
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_2
+
+ movdqa 0x20(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE2
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_3
+
+ movdqa 0x30(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE1
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_4
+
+ movdqa 0x40(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE0
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_0
+
+ add $0x50, SRC
+ jmp .Lad_a_loop
+
+.align 8
+.Lad_u_loop:
+ movdqu 0x00(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE4
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_1
+
+ movdqu 0x10(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE3
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_2
+
+ movdqu 0x20(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE2
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_3
+
+ movdqu 0x30(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE1
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_4
+
+ movdqu 0x40(SRC), MSG
+ aegis128_update
+ pxor MSG, STATE0
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lad_out_0
+
+ add $0x50, SRC
+ jmp .Lad_u_loop
+
+ /* store the state: */
+.Lad_out_0:
+ movdqu STATE0, 0x00(STATEP)
+ movdqu STATE1, 0x10(STATEP)
+ movdqu STATE2, 0x20(STATEP)
+ movdqu STATE3, 0x30(STATEP)
+ movdqu STATE4, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lad_out_1:
+ movdqu STATE4, 0x00(STATEP)
+ movdqu STATE0, 0x10(STATEP)
+ movdqu STATE1, 0x20(STATEP)
+ movdqu STATE2, 0x30(STATEP)
+ movdqu STATE3, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lad_out_2:
+ movdqu STATE3, 0x00(STATEP)
+ movdqu STATE4, 0x10(STATEP)
+ movdqu STATE0, 0x20(STATEP)
+ movdqu STATE1, 0x30(STATEP)
+ movdqu STATE2, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lad_out_3:
+ movdqu STATE2, 0x00(STATEP)
+ movdqu STATE3, 0x10(STATEP)
+ movdqu STATE4, 0x20(STATEP)
+ movdqu STATE0, 0x30(STATEP)
+ movdqu STATE1, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lad_out_4:
+ movdqu STATE1, 0x00(STATEP)
+ movdqu STATE2, 0x10(STATEP)
+ movdqu STATE3, 0x20(STATEP)
+ movdqu STATE4, 0x30(STATEP)
+ movdqu STATE0, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lad_out:
+ FRAME_END
+ ret
+ENDPROC(crypto_aegis128_aesni_ad)
+
+.macro encrypt_block a s0 s1 s2 s3 s4 i
+ movdq\a (\i * 0x10)(SRC), MSG
+ movdqa MSG, T0
+ pxor \s1, T0
+ pxor \s4, T0
+ movdqa \s2, T1
+ pand \s3, T1
+ pxor T1, T0
+ movdq\a T0, (\i * 0x10)(DST)
+
+ aegis128_update
+ pxor MSG, \s4
+
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Lenc_out_\i
+.endm
+
+/*
+ * void crypto_aegis128_aesni_enc(void *state, unsigned int length,
+ * const void *src, void *dst);
+ */
+ENTRY(crypto_aegis128_aesni_enc)
+ FRAME_BEGIN
+
+ cmp $0x10, LEN
+ jb .Lenc_out
+
+ /* load the state: */
+ movdqu 0x00(STATEP), STATE0
+ movdqu 0x10(STATEP), STATE1
+ movdqu 0x20(STATEP), STATE2
+ movdqu 0x30(STATEP), STATE3
+ movdqu 0x40(STATEP), STATE4
+
+ mov SRC, %r8
+ or DST, %r8
+ and $0xF, %r8
+ jnz .Lenc_u_loop
+
+.align 8
+.Lenc_a_loop:
+ encrypt_block a STATE0 STATE1 STATE2 STATE3 STATE4 0
+ encrypt_block a STATE4 STATE0 STATE1 STATE2 STATE3 1
+ encrypt_block a STATE3 STATE4 STATE0 STATE1 STATE2 2
+ encrypt_block a STATE2 STATE3 STATE4 STATE0 STATE1 3
+ encrypt_block a STATE1 STATE2 STATE3 STATE4 STATE0 4
+
+ add $0x50, SRC
+ add $0x50, DST
+ jmp .Lenc_a_loop
+
+.align 8
+.Lenc_u_loop:
+ encrypt_block u STATE0 STATE1 STATE2 STATE3 STATE4 0
+ encrypt_block u STATE4 STATE0 STATE1 STATE2 STATE3 1
+ encrypt_block u STATE3 STATE4 STATE0 STATE1 STATE2 2
+ encrypt_block u STATE2 STATE3 STATE4 STATE0 STATE1 3
+ encrypt_block u STATE1 STATE2 STATE3 STATE4 STATE0 4
+
+ add $0x50, SRC
+ add $0x50, DST
+ jmp .Lenc_u_loop
+
+ /* store the state: */
+.Lenc_out_0:
+ movdqu STATE4, 0x00(STATEP)
+ movdqu STATE0, 0x10(STATEP)
+ movdqu STATE1, 0x20(STATEP)
+ movdqu STATE2, 0x30(STATEP)
+ movdqu STATE3, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lenc_out_1:
+ movdqu STATE3, 0x00(STATEP)
+ movdqu STATE4, 0x10(STATEP)
+ movdqu STATE0, 0x20(STATEP)
+ movdqu STATE1, 0x30(STATEP)
+ movdqu STATE2, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lenc_out_2:
+ movdqu STATE2, 0x00(STATEP)
+ movdqu STATE3, 0x10(STATEP)
+ movdqu STATE4, 0x20(STATEP)
+ movdqu STATE0, 0x30(STATEP)
+ movdqu STATE1, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lenc_out_3:
+ movdqu STATE1, 0x00(STATEP)
+ movdqu STATE2, 0x10(STATEP)
+ movdqu STATE3, 0x20(STATEP)
+ movdqu STATE4, 0x30(STATEP)
+ movdqu STATE0, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lenc_out_4:
+ movdqu STATE0, 0x00(STATEP)
+ movdqu STATE1, 0x10(STATEP)
+ movdqu STATE2, 0x20(STATEP)
+ movdqu STATE3, 0x30(STATEP)
+ movdqu STATE4, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Lenc_out:
+ FRAME_END
+ ret
+ENDPROC(crypto_aegis128_aesni_enc)
+
+/*
+ * void crypto_aegis128_aesni_enc_tail(void *state, unsigned int length,
+ * const void *src, void *dst);
+ */
+ENTRY(crypto_aegis128_aesni_enc_tail)
+ FRAME_BEGIN
+
+ /* load the state: */
+ movdqu 0x00(STATEP), STATE0
+ movdqu 0x10(STATEP), STATE1
+ movdqu 0x20(STATEP), STATE2
+ movdqu 0x30(STATEP), STATE3
+ movdqu 0x40(STATEP), STATE4
+
+ /* encrypt message: */
+ call __load_partial
+
+ movdqa MSG, T0
+ pxor STATE1, T0
+ pxor STATE4, T0
+ movdqa STATE2, T1
+ pand STATE3, T1
+ pxor T1, T0
+
+ call __store_partial
+
+ aegis128_update
+ pxor MSG, STATE4
+
+ /* store the state: */
+ movdqu STATE4, 0x00(STATEP)
+ movdqu STATE0, 0x10(STATEP)
+ movdqu STATE1, 0x20(STATEP)
+ movdqu STATE2, 0x30(STATEP)
+ movdqu STATE3, 0x40(STATEP)
+
+ FRAME_END
+ENDPROC(crypto_aegis128_aesni_enc_tail)
+
+.macro decrypt_block a s0 s1 s2 s3 s4 i
+ movdq\a (\i * 0x10)(SRC), MSG
+ pxor \s1, MSG
+ pxor \s4, MSG
+ movdqa \s2, T1
+ pand \s3, T1
+ pxor T1, MSG
+ movdq\a MSG, (\i * 0x10)(DST)
+
+ aegis128_update
+ pxor MSG, \s4
+
+ sub $0x10, LEN
+ cmp $0x10, LEN
+ jl .Ldec_out_\i
+.endm
+
+/*
+ * void crypto_aegis128_aesni_dec(void *state, unsigned int length,
+ * const void *src, void *dst);
+ */
+ENTRY(crypto_aegis128_aesni_dec)
+ FRAME_BEGIN
+
+ cmp $0x10, LEN
+ jb .Ldec_out
+
+ /* load the state: */
+ movdqu 0x00(STATEP), STATE0
+ movdqu 0x10(STATEP), STATE1
+ movdqu 0x20(STATEP), STATE2
+ movdqu 0x30(STATEP), STATE3
+ movdqu 0x40(STATEP), STATE4
+
+ mov SRC, %r8
+ or DST, %r8
+ and $0xF, %r8
+ jnz .Ldec_u_loop
+
+.align 8
+.Ldec_a_loop:
+ decrypt_block a STATE0 STATE1 STATE2 STATE3 STATE4 0
+ decrypt_block a STATE4 STATE0 STATE1 STATE2 STATE3 1
+ decrypt_block a STATE3 STATE4 STATE0 STATE1 STATE2 2
+ decrypt_block a STATE2 STATE3 STATE4 STATE0 STATE1 3
+ decrypt_block a STATE1 STATE2 STATE3 STATE4 STATE0 4
+
+ add $0x50, SRC
+ add $0x50, DST
+ jmp .Ldec_a_loop
+
+.align 8
+.Ldec_u_loop:
+ decrypt_block u STATE0 STATE1 STATE2 STATE3 STATE4 0
+ decrypt_block u STATE4 STATE0 STATE1 STATE2 STATE3 1
+ decrypt_block u STATE3 STATE4 STATE0 STATE1 STATE2 2
+ decrypt_block u STATE2 STATE3 STATE4 STATE0 STATE1 3
+ decrypt_block u STATE1 STATE2 STATE3 STATE4 STATE0 4
+
+ add $0x50, SRC
+ add $0x50, DST
+ jmp .Ldec_u_loop
+
+ /* store the state: */
+.Ldec_out_0:
+ movdqu STATE4, 0x00(STATEP)
+ movdqu STATE0, 0x10(STATEP)
+ movdqu STATE1, 0x20(STATEP)
+ movdqu STATE2, 0x30(STATEP)
+ movdqu STATE3, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Ldec_out_1:
+ movdqu STATE3, 0x00(STATEP)
+ movdqu STATE4, 0x10(STATEP)
+ movdqu STATE0, 0x20(STATEP)
+ movdqu STATE1, 0x30(STATEP)
+ movdqu STATE2, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Ldec_out_2:
+ movdqu STATE2, 0x00(STATEP)
+ movdqu STATE3, 0x10(STATEP)
+ movdqu STATE4, 0x20(STATEP)
+ movdqu STATE0, 0x30(STATEP)
+ movdqu STATE1, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Ldec_out_3:
+ movdqu STATE1, 0x00(STATEP)
+ movdqu STATE2, 0x10(STATEP)
+ movdqu STATE3, 0x20(STATEP)
+ movdqu STATE4, 0x30(STATEP)
+ movdqu STATE0, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Ldec_out_4:
+ movdqu STATE0, 0x00(STATEP)
+ movdqu STATE1, 0x10(STATEP)
+ movdqu STATE2, 0x20(STATEP)
+ movdqu STATE3, 0x30(STATEP)
+ movdqu STATE4, 0x40(STATEP)
+ FRAME_END
+ ret
+
+.Ldec_out:
+ FRAME_END
+ ret
+ENDPROC(crypto_aegis128_aesni_dec)
+
+/*
+ * void crypto_aegis128_aesni_dec_tail(void *state, unsigned int length,
+ * const void *src, void *dst);
+ */
+ENTRY(crypto_aegis128_aesni_dec_tail)
+ FRAME_BEGIN
+
+ /* load the state: */
+ movdqu 0x00(STATEP), STATE0
+ movdqu 0x10(STATEP), STATE1
+ movdqu 0x20(STATEP), STATE2
+ movdqu 0x30(STATEP), STATE3
+ movdqu 0x40(STATEP), STATE4
+
+ /* decrypt message: */
+ call __load_partial
+
+ pxor STATE1, MSG
+ pxor STATE4, MSG
+ movdqa STATE2, T1
+ pand STATE3, T1
+ pxor T1, MSG
+
+ movdqa MSG, T0
+ call __store_partial
+
+ /* mask with byte count: */
+ movq LEN, T0
+ punpcklbw T0, T0
+ punpcklbw T0, T0
+ punpcklbw T0, T0
+ punpcklbw T0, T0
+ movdqa .Laegis128_counter, T1
+ pcmpgtb T1, T0
+ pand T0, MSG
+
+ aegis128_update
+ pxor MSG, STATE4
+
+ /* store the state: */
+ movdqu STATE4, 0x00(STATEP)
+ movdqu STATE0, 0x10(STATEP)
+ movdqu STATE1, 0x20(STATEP)
+ movdqu STATE2, 0x30(STATEP)
+ movdqu STATE3, 0x40(STATEP)
+
+ FRAME_END
+ ret
+ENDPROC(crypto_aegis128_aesni_dec_tail)
+
+/*
+ * void crypto_aegis128_aesni_final(void *state, void *tag_xor,
+ * u64 assoclen, u64 cryptlen);
+ */
+ENTRY(crypto_aegis128_aesni_final)
+ FRAME_BEGIN
+
+ /* load the state: */
+ movdqu 0x00(STATEP), STATE0
+ movdqu 0x10(STATEP), STATE1
+ movdqu 0x20(STATEP), STATE2
+ movdqu 0x30(STATEP), STATE3
+ movdqu 0x40(STATEP), STATE4
+
+ /* prepare length block: */
+ movq %rdx, MSG
+ movq %rcx, T0
+ pslldq $8, T0
+ pxor T0, MSG
+ psllq $3, MSG /* multiply by 8 (to get bit count) */
+
+ pxor STATE3, MSG
+
+ /* update state: */
+ aegis128_update; pxor MSG, STATE4
+ aegis128_update; pxor MSG, STATE3
+ aegis128_update; pxor MSG, STATE2
+ aegis128_update; pxor MSG, STATE1
+ aegis128_update; pxor MSG, STATE0
+ aegis128_update; pxor MSG, STATE4
+ aegis128_update; pxor MSG, STATE3
+
+ /* xor tag: */
+ movdqu (%rsi), MSG
+
+ pxor STATE0, MSG
+ pxor STATE1, MSG
+ pxor STATE2, MSG
+ pxor STATE3, MSG
+ pxor STATE4, MSG
+
+ movdqu MSG, (%rsi)
+
+ FRAME_END
+ ret
+ENDPROC(crypto_aegis128_aesni_final)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 06:08:10 +0000