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-rw-r--r--arch/x86/crypto/chacha-ssse3-x86_64.S795
1 files changed, 795 insertions, 0 deletions
diff --git a/arch/x86/crypto/chacha-ssse3-x86_64.S b/arch/x86/crypto/chacha-ssse3-x86_64.S
new file mode 100644
index 000000000000..c05a7a963dc3
--- /dev/null
+++ b/arch/x86/crypto/chacha-ssse3-x86_64.S
@@ -0,0 +1,795 @@
+/*
+ * ChaCha 256-bit cipher algorithm, x64 SSSE3 functions
+ *
+ * Copyright (C) 2015 Martin Willi
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of 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.
+ */
+
+#include <linux/linkage.h>
+#include <asm/frame.h>
+
+.section .rodata.cst16.ROT8, "aM", @progbits, 16
+.align 16
+ROT8: .octa 0x0e0d0c0f0a09080b0605040702010003
+.section .rodata.cst16.ROT16, "aM", @progbits, 16
+.align 16
+ROT16: .octa 0x0d0c0f0e09080b0a0504070601000302
+.section .rodata.cst16.CTRINC, "aM", @progbits, 16
+.align 16
+CTRINC: .octa 0x00000003000000020000000100000000
+
+.text
+
+/*
+ * chacha_permute - permute one block
+ *
+ * Permute one 64-byte block where the state matrix is in %xmm0-%xmm3. This
+ * function performs matrix operations on four words in parallel, but requires
+ * shuffling to rearrange the words after each round. 8/16-bit word rotation is
+ * done with the slightly better performing SSSE3 byte shuffling, 7/12-bit word
+ * rotation uses traditional shift+OR.
+ *
+ * The round count is given in %r8d.
+ *
+ * Clobbers: %r8d, %xmm4-%xmm7
+ */
+chacha_permute:
+
+ movdqa ROT8(%rip),%xmm4
+ movdqa ROT16(%rip),%xmm5
+
+.Ldoubleround:
+ # x0 += x1, x3 = rotl32(x3 ^ x0, 16)
+ paddd %xmm1,%xmm0
+ pxor %xmm0,%xmm3
+ pshufb %xmm5,%xmm3
+
+ # x2 += x3, x1 = rotl32(x1 ^ x2, 12)
+ paddd %xmm3,%xmm2
+ pxor %xmm2,%xmm1
+ movdqa %xmm1,%xmm6
+ pslld $12,%xmm6
+ psrld $20,%xmm1
+ por %xmm6,%xmm1
+
+ # x0 += x1, x3 = rotl32(x3 ^ x0, 8)
+ paddd %xmm1,%xmm0
+ pxor %xmm0,%xmm3
+ pshufb %xmm4,%xmm3
+
+ # x2 += x3, x1 = rotl32(x1 ^ x2, 7)
+ paddd %xmm3,%xmm2
+ pxor %xmm2,%xmm1
+ movdqa %xmm1,%xmm7
+ pslld $7,%xmm7
+ psrld $25,%xmm1
+ por %xmm7,%xmm1
+
+ # x1 = shuffle32(x1, MASK(0, 3, 2, 1))
+ pshufd $0x39,%xmm1,%xmm1
+ # x2 = shuffle32(x2, MASK(1, 0, 3, 2))
+ pshufd $0x4e,%xmm2,%xmm2
+ # x3 = shuffle32(x3, MASK(2, 1, 0, 3))
+ pshufd $0x93,%xmm3,%xmm3
+
+ # x0 += x1, x3 = rotl32(x3 ^ x0, 16)
+ paddd %xmm1,%xmm0
+ pxor %xmm0,%xmm3
+ pshufb %xmm5,%xmm3
+
+ # x2 += x3, x1 = rotl32(x1 ^ x2, 12)
+ paddd %xmm3,%xmm2
+ pxor %xmm2,%xmm1
+ movdqa %xmm1,%xmm6
+ pslld $12,%xmm6
+ psrld $20,%xmm1
+ por %xmm6,%xmm1
+
+ # x0 += x1, x3 = rotl32(x3 ^ x0, 8)
+ paddd %xmm1,%xmm0
+ pxor %xmm0,%xmm3
+ pshufb %xmm4,%xmm3
+
+ # x2 += x3, x1 = rotl32(x1 ^ x2, 7)
+ paddd %xmm3,%xmm2
+ pxor %xmm2,%xmm1
+ movdqa %xmm1,%xmm7
+ pslld $7,%xmm7
+ psrld $25,%xmm1
+ por %xmm7,%xmm1
+
+ # x1 = shuffle32(x1, MASK(2, 1, 0, 3))
+ pshufd $0x93,%xmm1,%xmm1
+ # x2 = shuffle32(x2, MASK(1, 0, 3, 2))
+ pshufd $0x4e,%xmm2,%xmm2
+ # x3 = shuffle32(x3, MASK(0, 3, 2, 1))
+ pshufd $0x39,%xmm3,%xmm3
+
+ sub $2,%r8d
+ jnz .Ldoubleround
+
+ ret
+ENDPROC(chacha_permute)
+
+ENTRY(chacha_block_xor_ssse3)
+ # %rdi: Input state matrix, s
+ # %rsi: up to 1 data block output, o
+ # %rdx: up to 1 data block input, i
+ # %rcx: input/output length in bytes
+ # %r8d: nrounds
+ FRAME_BEGIN
+
+ # x0..3 = s0..3
+ movdqa 0x00(%rdi),%xmm0
+ movdqa 0x10(%rdi),%xmm1
+ movdqa 0x20(%rdi),%xmm2
+ movdqa 0x30(%rdi),%xmm3
+ movdqa %xmm0,%xmm8
+ movdqa %xmm1,%xmm9
+ movdqa %xmm2,%xmm10
+ movdqa %xmm3,%xmm11
+
+ mov %rcx,%rax
+ call chacha_permute
+
+ # o0 = i0 ^ (x0 + s0)
+ paddd %xmm8,%xmm0
+ cmp $0x10,%rax
+ jl .Lxorpart
+ movdqu 0x00(%rdx),%xmm4
+ pxor %xmm4,%xmm0
+ movdqu %xmm0,0x00(%rsi)
+ # o1 = i1 ^ (x1 + s1)
+ paddd %xmm9,%xmm1
+ movdqa %xmm1,%xmm0
+ cmp $0x20,%rax
+ jl .Lxorpart
+ movdqu 0x10(%rdx),%xmm0
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x10(%rsi)
+ # o2 = i2 ^ (x2 + s2)
+ paddd %xmm10,%xmm2
+ movdqa %xmm2,%xmm0
+ cmp $0x30,%rax
+ jl .Lxorpart
+ movdqu 0x20(%rdx),%xmm0
+ pxor %xmm2,%xmm0
+ movdqu %xmm0,0x20(%rsi)
+ # o3 = i3 ^ (x3 + s3)
+ paddd %xmm11,%xmm3
+ movdqa %xmm3,%xmm0
+ cmp $0x40,%rax
+ jl .Lxorpart
+ movdqu 0x30(%rdx),%xmm0
+ pxor %xmm3,%xmm0
+ movdqu %xmm0,0x30(%rsi)
+
+.Ldone:
+ FRAME_END
+ ret
+
+.Lxorpart:
+ # xor remaining bytes from partial register into output
+ mov %rax,%r9
+ and $0x0f,%r9
+ jz .Ldone
+ and $~0x0f,%rax
+
+ mov %rsi,%r11
+
+ lea 8(%rsp),%r10
+ sub $0x10,%rsp
+ and $~31,%rsp
+
+ lea (%rdx,%rax),%rsi
+ mov %rsp,%rdi
+ mov %r9,%rcx
+ rep movsb
+
+ pxor 0x00(%rsp),%xmm0
+ movdqa %xmm0,0x00(%rsp)
+
+ mov %rsp,%rsi
+ lea (%r11,%rax),%rdi
+ mov %r9,%rcx
+ rep movsb
+
+ lea -8(%r10),%rsp
+ jmp .Ldone
+
+ENDPROC(chacha_block_xor_ssse3)
+
+ENTRY(hchacha_block_ssse3)
+ # %rdi: Input state matrix, s
+ # %rsi: output (8 32-bit words)
+ # %edx: nrounds
+ FRAME_BEGIN
+
+ movdqa 0x00(%rdi),%xmm0
+ movdqa 0x10(%rdi),%xmm1
+ movdqa 0x20(%rdi),%xmm2
+ movdqa 0x30(%rdi),%xmm3
+
+ mov %edx,%r8d
+ call chacha_permute
+
+ movdqu %xmm0,0x00(%rsi)
+ movdqu %xmm3,0x10(%rsi)
+
+ FRAME_END
+ ret
+ENDPROC(hchacha_block_ssse3)
+
+ENTRY(chacha_4block_xor_ssse3)
+ # %rdi: Input state matrix, s
+ # %rsi: up to 4 data blocks output, o
+ # %rdx: up to 4 data blocks input, i
+ # %rcx: input/output length in bytes
+ # %r8d: nrounds
+
+ # This function encrypts four consecutive ChaCha blocks by loading the
+ # the state matrix in SSE registers four times. As we need some scratch
+ # registers, we save the first four registers on the stack. The
+ # algorithm performs each operation on the corresponding word of each
+ # state matrix, hence requires no word shuffling. For final XORing step
+ # we transpose the matrix by interleaving 32- and then 64-bit words,
+ # which allows us to do XOR in SSE registers. 8/16-bit word rotation is
+ # done with the slightly better performing SSSE3 byte shuffling,
+ # 7/12-bit word rotation uses traditional shift+OR.
+
+ lea 8(%rsp),%r10
+ sub $0x80,%rsp
+ and $~63,%rsp
+ mov %rcx,%rax
+
+ # x0..15[0-3] = s0..3[0..3]
+ movq 0x00(%rdi),%xmm1
+ pshufd $0x00,%xmm1,%xmm0
+ pshufd $0x55,%xmm1,%xmm1
+ movq 0x08(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ movq 0x10(%rdi),%xmm5
+ pshufd $0x00,%xmm5,%xmm4
+ pshufd $0x55,%xmm5,%xmm5
+ movq 0x18(%rdi),%xmm7
+ pshufd $0x00,%xmm7,%xmm6
+ pshufd $0x55,%xmm7,%xmm7
+ movq 0x20(%rdi),%xmm9
+ pshufd $0x00,%xmm9,%xmm8
+ pshufd $0x55,%xmm9,%xmm9
+ movq 0x28(%rdi),%xmm11
+ pshufd $0x00,%xmm11,%xmm10
+ pshufd $0x55,%xmm11,%xmm11
+ movq 0x30(%rdi),%xmm13
+ pshufd $0x00,%xmm13,%xmm12
+ pshufd $0x55,%xmm13,%xmm13
+ movq 0x38(%rdi),%xmm15
+ pshufd $0x00,%xmm15,%xmm14
+ pshufd $0x55,%xmm15,%xmm15
+ # x0..3 on stack
+ movdqa %xmm0,0x00(%rsp)
+ movdqa %xmm1,0x10(%rsp)
+ movdqa %xmm2,0x20(%rsp)
+ movdqa %xmm3,0x30(%rsp)
+
+ movdqa CTRINC(%rip),%xmm1
+ movdqa ROT8(%rip),%xmm2
+ movdqa ROT16(%rip),%xmm3
+
+ # x12 += counter values 0-3
+ paddd %xmm1,%xmm12
+
+.Ldoubleround4:
+ # x0 += x4, x12 = rotl32(x12 ^ x0, 16)
+ movdqa 0x00(%rsp),%xmm0
+ paddd %xmm4,%xmm0
+ movdqa %xmm0,0x00(%rsp)
+ pxor %xmm0,%xmm12
+ pshufb %xmm3,%xmm12
+ # x1 += x5, x13 = rotl32(x13 ^ x1, 16)
+ movdqa 0x10(%rsp),%xmm0
+ paddd %xmm5,%xmm0
+ movdqa %xmm0,0x10(%rsp)
+ pxor %xmm0,%xmm13
+ pshufb %xmm3,%xmm13
+ # x2 += x6, x14 = rotl32(x14 ^ x2, 16)
+ movdqa 0x20(%rsp),%xmm0
+ paddd %xmm6,%xmm0
+ movdqa %xmm0,0x20(%rsp)
+ pxor %xmm0,%xmm14
+ pshufb %xmm3,%xmm14
+ # x3 += x7, x15 = rotl32(x15 ^ x3, 16)
+ movdqa 0x30(%rsp),%xmm0
+ paddd %xmm7,%xmm0
+ movdqa %xmm0,0x30(%rsp)
+ pxor %xmm0,%xmm15
+ pshufb %xmm3,%xmm15
+
+ # x8 += x12, x4 = rotl32(x4 ^ x8, 12)
+ paddd %xmm12,%xmm8
+ pxor %xmm8,%xmm4
+ movdqa %xmm4,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm4
+ por %xmm0,%xmm4
+ # x9 += x13, x5 = rotl32(x5 ^ x9, 12)
+ paddd %xmm13,%xmm9
+ pxor %xmm9,%xmm5
+ movdqa %xmm5,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm5
+ por %xmm0,%xmm5
+ # x10 += x14, x6 = rotl32(x6 ^ x10, 12)
+ paddd %xmm14,%xmm10
+ pxor %xmm10,%xmm6
+ movdqa %xmm6,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm6
+ por %xmm0,%xmm6
+ # x11 += x15, x7 = rotl32(x7 ^ x11, 12)
+ paddd %xmm15,%xmm11
+ pxor %xmm11,%xmm7
+ movdqa %xmm7,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm7
+ por %xmm0,%xmm7
+
+ # x0 += x4, x12 = rotl32(x12 ^ x0, 8)
+ movdqa 0x00(%rsp),%xmm0
+ paddd %xmm4,%xmm0
+ movdqa %xmm0,0x00(%rsp)
+ pxor %xmm0,%xmm12
+ pshufb %xmm2,%xmm12
+ # x1 += x5, x13 = rotl32(x13 ^ x1, 8)
+ movdqa 0x10(%rsp),%xmm0
+ paddd %xmm5,%xmm0
+ movdqa %xmm0,0x10(%rsp)
+ pxor %xmm0,%xmm13
+ pshufb %xmm2,%xmm13
+ # x2 += x6, x14 = rotl32(x14 ^ x2, 8)
+ movdqa 0x20(%rsp),%xmm0
+ paddd %xmm6,%xmm0
+ movdqa %xmm0,0x20(%rsp)
+ pxor %xmm0,%xmm14
+ pshufb %xmm2,%xmm14
+ # x3 += x7, x15 = rotl32(x15 ^ x3, 8)
+ movdqa 0x30(%rsp),%xmm0
+ paddd %xmm7,%xmm0
+ movdqa %xmm0,0x30(%rsp)
+ pxor %xmm0,%xmm15
+ pshufb %xmm2,%xmm15
+
+ # x8 += x12, x4 = rotl32(x4 ^ x8, 7)
+ paddd %xmm12,%xmm8
+ pxor %xmm8,%xmm4
+ movdqa %xmm4,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm4
+ por %xmm0,%xmm4
+ # x9 += x13, x5 = rotl32(x5 ^ x9, 7)
+ paddd %xmm13,%xmm9
+ pxor %xmm9,%xmm5
+ movdqa %xmm5,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm5
+ por %xmm0,%xmm5
+ # x10 += x14, x6 = rotl32(x6 ^ x10, 7)
+ paddd %xmm14,%xmm10
+ pxor %xmm10,%xmm6
+ movdqa %xmm6,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm6
+ por %xmm0,%xmm6
+ # x11 += x15, x7 = rotl32(x7 ^ x11, 7)
+ paddd %xmm15,%xmm11
+ pxor %xmm11,%xmm7
+ movdqa %xmm7,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm7
+ por %xmm0,%xmm7
+
+ # x0 += x5, x15 = rotl32(x15 ^ x0, 16)
+ movdqa 0x00(%rsp),%xmm0
+ paddd %xmm5,%xmm0
+ movdqa %xmm0,0x00(%rsp)
+ pxor %xmm0,%xmm15
+ pshufb %xmm3,%xmm15
+ # x1 += x6, x12 = rotl32(x12 ^ x1, 16)
+ movdqa 0x10(%rsp),%xmm0
+ paddd %xmm6,%xmm0
+ movdqa %xmm0,0x10(%rsp)
+ pxor %xmm0,%xmm12
+ pshufb %xmm3,%xmm12
+ # x2 += x7, x13 = rotl32(x13 ^ x2, 16)
+ movdqa 0x20(%rsp),%xmm0
+ paddd %xmm7,%xmm0
+ movdqa %xmm0,0x20(%rsp)
+ pxor %xmm0,%xmm13
+ pshufb %xmm3,%xmm13
+ # x3 += x4, x14 = rotl32(x14 ^ x3, 16)
+ movdqa 0x30(%rsp),%xmm0
+ paddd %xmm4,%xmm0
+ movdqa %xmm0,0x30(%rsp)
+ pxor %xmm0,%xmm14
+ pshufb %xmm3,%xmm14
+
+ # x10 += x15, x5 = rotl32(x5 ^ x10, 12)
+ paddd %xmm15,%xmm10
+ pxor %xmm10,%xmm5
+ movdqa %xmm5,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm5
+ por %xmm0,%xmm5
+ # x11 += x12, x6 = rotl32(x6 ^ x11, 12)
+ paddd %xmm12,%xmm11
+ pxor %xmm11,%xmm6
+ movdqa %xmm6,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm6
+ por %xmm0,%xmm6
+ # x8 += x13, x7 = rotl32(x7 ^ x8, 12)
+ paddd %xmm13,%xmm8
+ pxor %xmm8,%xmm7
+ movdqa %xmm7,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm7
+ por %xmm0,%xmm7
+ # x9 += x14, x4 = rotl32(x4 ^ x9, 12)
+ paddd %xmm14,%xmm9
+ pxor %xmm9,%xmm4
+ movdqa %xmm4,%xmm0
+ pslld $12,%xmm0
+ psrld $20,%xmm4
+ por %xmm0,%xmm4
+
+ # x0 += x5, x15 = rotl32(x15 ^ x0, 8)
+ movdqa 0x00(%rsp),%xmm0
+ paddd %xmm5,%xmm0
+ movdqa %xmm0,0x00(%rsp)
+ pxor %xmm0,%xmm15
+ pshufb %xmm2,%xmm15
+ # x1 += x6, x12 = rotl32(x12 ^ x1, 8)
+ movdqa 0x10(%rsp),%xmm0
+ paddd %xmm6,%xmm0
+ movdqa %xmm0,0x10(%rsp)
+ pxor %xmm0,%xmm12
+ pshufb %xmm2,%xmm12
+ # x2 += x7, x13 = rotl32(x13 ^ x2, 8)
+ movdqa 0x20(%rsp),%xmm0
+ paddd %xmm7,%xmm0
+ movdqa %xmm0,0x20(%rsp)
+ pxor %xmm0,%xmm13
+ pshufb %xmm2,%xmm13
+ # x3 += x4, x14 = rotl32(x14 ^ x3, 8)
+ movdqa 0x30(%rsp),%xmm0
+ paddd %xmm4,%xmm0
+ movdqa %xmm0,0x30(%rsp)
+ pxor %xmm0,%xmm14
+ pshufb %xmm2,%xmm14
+
+ # x10 += x15, x5 = rotl32(x5 ^ x10, 7)
+ paddd %xmm15,%xmm10
+ pxor %xmm10,%xmm5
+ movdqa %xmm5,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm5
+ por %xmm0,%xmm5
+ # x11 += x12, x6 = rotl32(x6 ^ x11, 7)
+ paddd %xmm12,%xmm11
+ pxor %xmm11,%xmm6
+ movdqa %xmm6,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm6
+ por %xmm0,%xmm6
+ # x8 += x13, x7 = rotl32(x7 ^ x8, 7)
+ paddd %xmm13,%xmm8
+ pxor %xmm8,%xmm7
+ movdqa %xmm7,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm7
+ por %xmm0,%xmm7
+ # x9 += x14, x4 = rotl32(x4 ^ x9, 7)
+ paddd %xmm14,%xmm9
+ pxor %xmm9,%xmm4
+ movdqa %xmm4,%xmm0
+ pslld $7,%xmm0
+ psrld $25,%xmm4
+ por %xmm0,%xmm4
+
+ sub $2,%r8d
+ jnz .Ldoubleround4
+
+ # x0[0-3] += s0[0]
+ # x1[0-3] += s0[1]
+ movq 0x00(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd 0x00(%rsp),%xmm2
+ movdqa %xmm2,0x00(%rsp)
+ paddd 0x10(%rsp),%xmm3
+ movdqa %xmm3,0x10(%rsp)
+ # x2[0-3] += s0[2]
+ # x3[0-3] += s0[3]
+ movq 0x08(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd 0x20(%rsp),%xmm2
+ movdqa %xmm2,0x20(%rsp)
+ paddd 0x30(%rsp),%xmm3
+ movdqa %xmm3,0x30(%rsp)
+
+ # x4[0-3] += s1[0]
+ # x5[0-3] += s1[1]
+ movq 0x10(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd %xmm2,%xmm4
+ paddd %xmm3,%xmm5
+ # x6[0-3] += s1[2]
+ # x7[0-3] += s1[3]
+ movq 0x18(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd %xmm2,%xmm6
+ paddd %xmm3,%xmm7
+
+ # x8[0-3] += s2[0]
+ # x9[0-3] += s2[1]
+ movq 0x20(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd %xmm2,%xmm8
+ paddd %xmm3,%xmm9
+ # x10[0-3] += s2[2]
+ # x11[0-3] += s2[3]
+ movq 0x28(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd %xmm2,%xmm10
+ paddd %xmm3,%xmm11
+
+ # x12[0-3] += s3[0]
+ # x13[0-3] += s3[1]
+ movq 0x30(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd %xmm2,%xmm12
+ paddd %xmm3,%xmm13
+ # x14[0-3] += s3[2]
+ # x15[0-3] += s3[3]
+ movq 0x38(%rdi),%xmm3
+ pshufd $0x00,%xmm3,%xmm2
+ pshufd $0x55,%xmm3,%xmm3
+ paddd %xmm2,%xmm14
+ paddd %xmm3,%xmm15
+
+ # x12 += counter values 0-3
+ paddd %xmm1,%xmm12
+
+ # interleave 32-bit words in state n, n+1
+ movdqa 0x00(%rsp),%xmm0
+ movdqa 0x10(%rsp),%xmm1
+ movdqa %xmm0,%xmm2
+ punpckldq %xmm1,%xmm2
+ punpckhdq %xmm1,%xmm0
+ movdqa %xmm2,0x00(%rsp)
+ movdqa %xmm0,0x10(%rsp)
+ movdqa 0x20(%rsp),%xmm0
+ movdqa 0x30(%rsp),%xmm1
+ movdqa %xmm0,%xmm2
+ punpckldq %xmm1,%xmm2
+ punpckhdq %xmm1,%xmm0
+ movdqa %xmm2,0x20(%rsp)
+ movdqa %xmm0,0x30(%rsp)
+ movdqa %xmm4,%xmm0
+ punpckldq %xmm5,%xmm4
+ punpckhdq %xmm5,%xmm0
+ movdqa %xmm0,%xmm5
+ movdqa %xmm6,%xmm0
+ punpckldq %xmm7,%xmm6
+ punpckhdq %xmm7,%xmm0
+ movdqa %xmm0,%xmm7
+ movdqa %xmm8,%xmm0
+ punpckldq %xmm9,%xmm8
+ punpckhdq %xmm9,%xmm0
+ movdqa %xmm0,%xmm9
+ movdqa %xmm10,%xmm0
+ punpckldq %xmm11,%xmm10
+ punpckhdq %xmm11,%xmm0
+ movdqa %xmm0,%xmm11
+ movdqa %xmm12,%xmm0
+ punpckldq %xmm13,%xmm12
+ punpckhdq %xmm13,%xmm0
+ movdqa %xmm0,%xmm13
+ movdqa %xmm14,%xmm0
+ punpckldq %xmm15,%xmm14
+ punpckhdq %xmm15,%xmm0
+ movdqa %xmm0,%xmm15
+
+ # interleave 64-bit words in state n, n+2
+ movdqa 0x00(%rsp),%xmm0
+ movdqa 0x20(%rsp),%xmm1
+ movdqa %xmm0,%xmm2
+ punpcklqdq %xmm1,%xmm2
+ punpckhqdq %xmm1,%xmm0
+ movdqa %xmm2,0x00(%rsp)
+ movdqa %xmm0,0x20(%rsp)
+ movdqa 0x10(%rsp),%xmm0
+ movdqa 0x30(%rsp),%xmm1
+ movdqa %xmm0,%xmm2
+ punpcklqdq %xmm1,%xmm2
+ punpckhqdq %xmm1,%xmm0
+ movdqa %xmm2,0x10(%rsp)
+ movdqa %xmm0,0x30(%rsp)
+ movdqa %xmm4,%xmm0
+ punpcklqdq %xmm6,%xmm4
+ punpckhqdq %xmm6,%xmm0
+ movdqa %xmm0,%xmm6
+ movdqa %xmm5,%xmm0
+ punpcklqdq %xmm7,%xmm5
+ punpckhqdq %xmm7,%xmm0
+ movdqa %xmm0,%xmm7
+ movdqa %xmm8,%xmm0
+ punpcklqdq %xmm10,%xmm8
+ punpckhqdq %xmm10,%xmm0
+ movdqa %xmm0,%xmm10
+ movdqa %xmm9,%xmm0
+ punpcklqdq %xmm11,%xmm9
+ punpckhqdq %xmm11,%xmm0
+ movdqa %xmm0,%xmm11
+ movdqa %xmm12,%xmm0
+ punpcklqdq %xmm14,%xmm12
+ punpckhqdq %xmm14,%xmm0
+ movdqa %xmm0,%xmm14
+ movdqa %xmm13,%xmm0
+ punpcklqdq %xmm15,%xmm13
+ punpckhqdq %xmm15,%xmm0
+ movdqa %xmm0,%xmm15
+
+ # xor with corresponding input, write to output
+ movdqa 0x00(%rsp),%xmm0
+ cmp $0x10,%rax
+ jl .Lxorpart4
+ movdqu 0x00(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x00(%rsi)
+
+ movdqu %xmm4,%xmm0
+ cmp $0x20,%rax
+ jl .Lxorpart4
+ movdqu 0x10(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x10(%rsi)
+
+ movdqu %xmm8,%xmm0
+ cmp $0x30,%rax
+ jl .Lxorpart4
+ movdqu 0x20(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x20(%rsi)
+
+ movdqu %xmm12,%xmm0
+ cmp $0x40,%rax
+ jl .Lxorpart4
+ movdqu 0x30(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x30(%rsi)
+
+ movdqa 0x20(%rsp),%xmm0
+ cmp $0x50,%rax
+ jl .Lxorpart4
+ movdqu 0x40(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x40(%rsi)
+
+ movdqu %xmm6,%xmm0
+ cmp $0x60,%rax
+ jl .Lxorpart4
+ movdqu 0x50(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x50(%rsi)
+
+ movdqu %xmm10,%xmm0
+ cmp $0x70,%rax
+ jl .Lxorpart4
+ movdqu 0x60(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x60(%rsi)
+
+ movdqu %xmm14,%xmm0
+ cmp $0x80,%rax
+ jl .Lxorpart4
+ movdqu 0x70(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x70(%rsi)
+
+ movdqa 0x10(%rsp),%xmm0
+ cmp $0x90,%rax
+ jl .Lxorpart4
+ movdqu 0x80(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x80(%rsi)
+
+ movdqu %xmm5,%xmm0
+ cmp $0xa0,%rax
+ jl .Lxorpart4
+ movdqu 0x90(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0x90(%rsi)
+
+ movdqu %xmm9,%xmm0
+ cmp $0xb0,%rax
+ jl .Lxorpart4
+ movdqu 0xa0(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0xa0(%rsi)
+
+ movdqu %xmm13,%xmm0
+ cmp $0xc0,%rax
+ jl .Lxorpart4
+ movdqu 0xb0(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0xb0(%rsi)
+
+ movdqa 0x30(%rsp),%xmm0
+ cmp $0xd0,%rax
+ jl .Lxorpart4
+ movdqu 0xc0(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0xc0(%rsi)
+
+ movdqu %xmm7,%xmm0
+ cmp $0xe0,%rax
+ jl .Lxorpart4
+ movdqu 0xd0(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0xd0(%rsi)
+
+ movdqu %xmm11,%xmm0
+ cmp $0xf0,%rax
+ jl .Lxorpart4
+ movdqu 0xe0(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0xe0(%rsi)
+
+ movdqu %xmm15,%xmm0
+ cmp $0x100,%rax
+ jl .Lxorpart4
+ movdqu 0xf0(%rdx),%xmm1
+ pxor %xmm1,%xmm0
+ movdqu %xmm0,0xf0(%rsi)
+
+.Ldone4:
+ lea -8(%r10),%rsp
+ ret
+
+.Lxorpart4:
+ # xor remaining bytes from partial register into output
+ mov %rax,%r9
+ and $0x0f,%r9
+ jz .Ldone4
+ and $~0x0f,%rax
+
+ mov %rsi,%r11
+
+ lea (%rdx,%rax),%rsi
+ mov %rsp,%rdi
+ mov %r9,%rcx
+ rep movsb
+
+ pxor 0x00(%rsp),%xmm0
+ movdqa %xmm0,0x00(%rsp)
+
+ mov %rsp,%rsi
+ lea (%r11,%rax),%rdi
+ mov %r9,%rcx
+ rep movsb
+
+ jmp .Ldone4
+
+ENDPROC(chacha_4block_xor_ssse3)