@@ -1,13 +1,13 @@
/*
* ChaCha/XChaCha NEON helper functions
*
- * Copyright (C) 2016 Linaro, Ltd. <ard.biesheuvel@linaro.org>
+ * Copyright (C) 2016-2018 Linaro, Ltd. <ard.biesheuvel@linaro.org>
*
* 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.
*
- * Based on:
+ * Originally based on:
* ChaCha20 256-bit cipher algorithm, RFC7539, x64 SSSE3 functions
*
* Copyright (C) 2015 Martin Willi
@@ -160,8 +160,27 @@ ENTRY(hchacha_block_neon)
ret x9
ENDPROC(hchacha_block_neon)
+ a0 .req w12
+ a1 .req w13
+ a2 .req w14
+ a3 .req w15
+ a4 .req w16
+ a5 .req w17
+ a6 .req w19
+ a7 .req w20
+ a8 .req w21
+ a9 .req w22
+ a10 .req w23
+ a11 .req w24
+ a12 .req w25
+ a13 .req w26
+ a14 .req w27
+ a15 .req w28
+
.align 6
ENTRY(chacha_4block_xor_neon)
+ frame_push 10
+
// x0: Input state matrix, s
// x1: 4 data blocks output, o
// x2: 4 data blocks input, i
@@ -181,6 +200,9 @@ ENTRY(chacha_4block_xor_neon)
// matrix by interleaving 32- and then 64-bit words, which allows us to
// do XOR in NEON registers.
//
+ // At the same time, a fifth block is encrypted in parallel using
+ // scalar registers
+ //
adr_l x9, CTRINC // ... and ROT8
ld1 {v30.4s-v31.4s}, [x9]
@@ -191,7 +213,24 @@ ENTRY(chacha_4block_xor_neon)
ld4r { v8.4s-v11.4s}, [x8], #16
ld4r {v12.4s-v15.4s}, [x8]
- // x12 += counter values 0-3
+ mov a0, v0.s[0]
+ mov a1, v1.s[0]
+ mov a2, v2.s[0]
+ mov a3, v3.s[0]
+ mov a4, v4.s[0]
+ mov a5, v5.s[0]
+ mov a6, v6.s[0]
+ mov a7, v7.s[0]
+ mov a8, v8.s[0]
+ mov a9, v9.s[0]
+ mov a10, v10.s[0]
+ mov a11, v11.s[0]
+ mov a12, v12.s[0]
+ mov a13, v13.s[0]
+ mov a14, v14.s[0]
+ mov a15, v15.s[0]
+
+ // x12 += counter values 1-4
add v12.4s, v12.4s, v30.4s
.Ldoubleround4:
@@ -200,33 +239,53 @@ ENTRY(chacha_4block_xor_neon)
// x2 += x6, x14 = rotl32(x14 ^ x2, 16)
// x3 += x7, x15 = rotl32(x15 ^ x3, 16)
add v0.4s, v0.4s, v4.4s
+ add a0, a0, a4
add v1.4s, v1.4s, v5.4s
+ add a1, a1, a5
add v2.4s, v2.4s, v6.4s
+ add a2, a2, a6
add v3.4s, v3.4s, v7.4s
+ add a3, a3, a7
eor v12.16b, v12.16b, v0.16b
+ eor a12, a12, a0
eor v13.16b, v13.16b, v1.16b
+ eor a13, a13, a1
eor v14.16b, v14.16b, v2.16b
+ eor a14, a14, a2
eor v15.16b, v15.16b, v3.16b
+ eor a15, a15, a3
rev32 v12.8h, v12.8h
+ ror a12, a12, #16
rev32 v13.8h, v13.8h
+ ror a13, a13, #16
rev32 v14.8h, v14.8h
+ ror a14, a14, #16
rev32 v15.8h, v15.8h
+ ror a15, a15, #16
// x8 += x12, x4 = rotl32(x4 ^ x8, 12)
// x9 += x13, x5 = rotl32(x5 ^ x9, 12)
// x10 += x14, x6 = rotl32(x6 ^ x10, 12)
// x11 += x15, x7 = rotl32(x7 ^ x11, 12)
add v8.4s, v8.4s, v12.4s
+ add a8, a8, a12
add v9.4s, v9.4s, v13.4s
+ add a9, a9, a13
add v10.4s, v10.4s, v14.4s
+ add a10, a10, a14
add v11.4s, v11.4s, v15.4s
+ add a11, a11, a15
eor v16.16b, v4.16b, v8.16b
+ eor a4, a4, a8
eor v17.16b, v5.16b, v9.16b
+ eor a5, a5, a9
eor v18.16b, v6.16b, v10.16b
+ eor a6, a6, a10
eor v19.16b, v7.16b, v11.16b
+ eor a7, a7, a11
shl v4.4s, v16.4s, #12
shl v5.4s, v17.4s, #12
@@ -234,42 +293,66 @@ ENTRY(chacha_4block_xor_neon)
shl v7.4s, v19.4s, #12
sri v4.4s, v16.4s, #20
+ ror a4, a4, #20
sri v5.4s, v17.4s, #20
+ ror a5, a5, #20
sri v6.4s, v18.4s, #20
+ ror a6, a6, #20
sri v7.4s, v19.4s, #20
+ ror a7, a7, #20
// x0 += x4, x12 = rotl32(x12 ^ x0, 8)
// x1 += x5, x13 = rotl32(x13 ^ x1, 8)
// x2 += x6, x14 = rotl32(x14 ^ x2, 8)
// x3 += x7, x15 = rotl32(x15 ^ x3, 8)
add v0.4s, v0.4s, v4.4s
+ add a0, a0, a4
add v1.4s, v1.4s, v5.4s
+ add a1, a1, a5
add v2.4s, v2.4s, v6.4s
+ add a2, a2, a6
add v3.4s, v3.4s, v7.4s
+ add a3, a3, a7
eor v12.16b, v12.16b, v0.16b
+ eor a12, a12, a0
eor v13.16b, v13.16b, v1.16b
+ eor a13, a13, a1
eor v14.16b, v14.16b, v2.16b
+ eor a14, a14, a2
eor v15.16b, v15.16b, v3.16b
+ eor a15, a15, a3
tbl v12.16b, {v12.16b}, v31.16b
+ ror a12, a12, #24
tbl v13.16b, {v13.16b}, v31.16b
+ ror a13, a13, #24
tbl v14.16b, {v14.16b}, v31.16b
+ ror a14, a14, #24
tbl v15.16b, {v15.16b}, v31.16b
+ ror a15, a15, #24
// x8 += x12, x4 = rotl32(x4 ^ x8, 7)
// x9 += x13, x5 = rotl32(x5 ^ x9, 7)
// x10 += x14, x6 = rotl32(x6 ^ x10, 7)
// x11 += x15, x7 = rotl32(x7 ^ x11, 7)
add v8.4s, v8.4s, v12.4s
+ add a8, a8, a12
add v9.4s, v9.4s, v13.4s
+ add a9, a9, a13
add v10.4s, v10.4s, v14.4s
+ add a10, a10, a14
add v11.4s, v11.4s, v15.4s
+ add a11, a11, a15
eor v16.16b, v4.16b, v8.16b
+ eor a4, a4, a8
eor v17.16b, v5.16b, v9.16b
+ eor a5, a5, a9
eor v18.16b, v6.16b, v10.16b
+ eor a6, a6, a10
eor v19.16b, v7.16b, v11.16b
+ eor a7, a7, a11
shl v4.4s, v16.4s, #7
shl v5.4s, v17.4s, #7
@@ -277,42 +360,66 @@ ENTRY(chacha_4block_xor_neon)
shl v7.4s, v19.4s, #7
sri v4.4s, v16.4s, #25
+ ror a4, a4, #25
sri v5.4s, v17.4s, #25
+ ror a5, a5, #25
sri v6.4s, v18.4s, #25
+ ror a6, a6, #25
sri v7.4s, v19.4s, #25
+ ror a7, a7, #25
// x0 += x5, x15 = rotl32(x15 ^ x0, 16)
// x1 += x6, x12 = rotl32(x12 ^ x1, 16)
// x2 += x7, x13 = rotl32(x13 ^ x2, 16)
// x3 += x4, x14 = rotl32(x14 ^ x3, 16)
add v0.4s, v0.4s, v5.4s
+ add a0, a0, a5
add v1.4s, v1.4s, v6.4s
+ add a1, a1, a6
add v2.4s, v2.4s, v7.4s
+ add a2, a2, a7
add v3.4s, v3.4s, v4.4s
+ add a3, a3, a4
eor v15.16b, v15.16b, v0.16b
+ eor a15, a15, a0
eor v12.16b, v12.16b, v1.16b
+ eor a12, a12, a1
eor v13.16b, v13.16b, v2.16b
+ eor a13, a13, a2
eor v14.16b, v14.16b, v3.16b
+ eor a14, a14, a3
rev32 v15.8h, v15.8h
+ ror a15, a15, #16
rev32 v12.8h, v12.8h
+ ror a12, a12, #16
rev32 v13.8h, v13.8h
+ ror a13, a13, #16
rev32 v14.8h, v14.8h
+ ror a14, a14, #16
// x10 += x15, x5 = rotl32(x5 ^ x10, 12)
// x11 += x12, x6 = rotl32(x6 ^ x11, 12)
// x8 += x13, x7 = rotl32(x7 ^ x8, 12)
// x9 += x14, x4 = rotl32(x4 ^ x9, 12)
add v10.4s, v10.4s, v15.4s
+ add a10, a10, a15
add v11.4s, v11.4s, v12.4s
+ add a11, a11, a12
add v8.4s, v8.4s, v13.4s
+ add a8, a8, a13
add v9.4s, v9.4s, v14.4s
+ add a9, a9, a14
eor v16.16b, v5.16b, v10.16b
+ eor a5, a5, a10
eor v17.16b, v6.16b, v11.16b
+ eor a6, a6, a11
eor v18.16b, v7.16b, v8.16b
+ eor a7, a7, a8
eor v19.16b, v4.16b, v9.16b
+ eor a4, a4, a9
shl v5.4s, v16.4s, #12
shl v6.4s, v17.4s, #12
@@ -320,42 +427,66 @@ ENTRY(chacha_4block_xor_neon)
shl v4.4s, v19.4s, #12
sri v5.4s, v16.4s, #20
+ ror a5, a5, #20
sri v6.4s, v17.4s, #20
+ ror a6, a6, #20
sri v7.4s, v18.4s, #20
+ ror a7, a7, #20
sri v4.4s, v19.4s, #20
+ ror a4, a4, #20
// x0 += x5, x15 = rotl32(x15 ^ x0, 8)
// x1 += x6, x12 = rotl32(x12 ^ x1, 8)
// x2 += x7, x13 = rotl32(x13 ^ x2, 8)
// x3 += x4, x14 = rotl32(x14 ^ x3, 8)
add v0.4s, v0.4s, v5.4s
+ add a0, a0, a5
add v1.4s, v1.4s, v6.4s
+ add a1, a1, a6
add v2.4s, v2.4s, v7.4s
+ add a2, a2, a7
add v3.4s, v3.4s, v4.4s
+ add a3, a3, a4
eor v15.16b, v15.16b, v0.16b
+ eor a15, a15, a0
eor v12.16b, v12.16b, v1.16b
+ eor a12, a12, a1
eor v13.16b, v13.16b, v2.16b
+ eor a13, a13, a2
eor v14.16b, v14.16b, v3.16b
+ eor a14, a14, a3
tbl v15.16b, {v15.16b}, v31.16b
+ ror a15, a15, #24
tbl v12.16b, {v12.16b}, v31.16b
+ ror a12, a12, #24
tbl v13.16b, {v13.16b}, v31.16b
+ ror a13, a13, #24
tbl v14.16b, {v14.16b}, v31.16b
+ ror a14, a14, #24
// x10 += x15, x5 = rotl32(x5 ^ x10, 7)
// x11 += x12, x6 = rotl32(x6 ^ x11, 7)
// x8 += x13, x7 = rotl32(x7 ^ x8, 7)
// x9 += x14, x4 = rotl32(x4 ^ x9, 7)
add v10.4s, v10.4s, v15.4s
+ add a10, a10, a15
add v11.4s, v11.4s, v12.4s
+ add a11, a11, a12
add v8.4s, v8.4s, v13.4s
+ add a8, a8, a13
add v9.4s, v9.4s, v14.4s
+ add a9, a9, a14
eor v16.16b, v5.16b, v10.16b
+ eor a5, a5, a10
eor v17.16b, v6.16b, v11.16b
+ eor a6, a6, a11
eor v18.16b, v7.16b, v8.16b
+ eor a7, a7, a8
eor v19.16b, v4.16b, v9.16b
+ eor a4, a4, a9
shl v5.4s, v16.4s, #7
shl v6.4s, v17.4s, #7
@@ -363,9 +494,13 @@ ENTRY(chacha_4block_xor_neon)
shl v4.4s, v19.4s, #7
sri v5.4s, v16.4s, #25
+ ror a5, a5, #25
sri v6.4s, v17.4s, #25
+ ror a6, a6, #25
sri v7.4s, v18.4s, #25
+ ror a7, a7, #25
sri v4.4s, v19.4s, #25
+ ror a4, a4, #25
subs w3, w3, #2
b.ne .Ldoubleround4
@@ -381,9 +516,17 @@ ENTRY(chacha_4block_xor_neon)
// x2[0-3] += s0[2]
// x3[0-3] += s0[3]
add v0.4s, v0.4s, v16.4s
+ mov w6, v16.s[0]
+ mov w7, v17.s[0]
add v1.4s, v1.4s, v17.4s
+ mov w8, v18.s[0]
+ mov w9, v19.s[0]
add v2.4s, v2.4s, v18.4s
+ add a0, a0, w6
+ add a1, a1, w7
add v3.4s, v3.4s, v19.4s
+ add a2, a2, w8
+ add a3, a3, w9
ld4r {v24.4s-v27.4s}, [x0], #16
ld4r {v28.4s-v31.4s}, [x0]
@@ -393,48 +536,96 @@ ENTRY(chacha_4block_xor_neon)
// x6[0-3] += s1[2]
// x7[0-3] += s1[3]
add v4.4s, v4.4s, v20.4s
+ mov w6, v20.s[0]
+ mov w7, v21.s[0]
add v5.4s, v5.4s, v21.4s
+ mov w8, v22.s[0]
+ mov w9, v23.s[0]
add v6.4s, v6.4s, v22.4s
+ add a4, a4, w6
+ add a5, a5, w7
add v7.4s, v7.4s, v23.4s
+ add a6, a6, w8
+ add a7, a7, w9
// x8[0-3] += s2[0]
// x9[0-3] += s2[1]
// x10[0-3] += s2[2]
// x11[0-3] += s2[3]
add v8.4s, v8.4s, v24.4s
+ mov w6, v24.s[0]
+ mov w7, v25.s[0]
add v9.4s, v9.4s, v25.4s
+ mov w8, v26.s[0]
+ mov w9, v27.s[0]
add v10.4s, v10.4s, v26.4s
+ add a8, a8, w6
+ add a9, a9, w7
add v11.4s, v11.4s, v27.4s
+ add a10, a10, w8
+ add a11, a11, w9
// x12[0-3] += s3[0]
// x13[0-3] += s3[1]
// x14[0-3] += s3[2]
// x15[0-3] += s3[3]
add v12.4s, v12.4s, v28.4s
+ mov w6, v28.s[0]
+ mov w7, v29.s[0]
add v13.4s, v13.4s, v29.4s
+ mov w8, v30.s[0]
+ mov w9, v31.s[0]
add v14.4s, v14.4s, v30.4s
+ add a12, a12, w6
+ add a13, a13, w7
add v15.4s, v15.4s, v31.4s
+ add a14, a14, w8
+ add a15, a15, w9
// interleave 32-bit words in state n, n+1
+ ldp w6, w7, [x2], #64
zip1 v16.4s, v0.4s, v1.4s
+ ldp w8, w9, [x2, #-56]
+ eor a0, a0, w6
zip2 v17.4s, v0.4s, v1.4s
+ eor a1, a1, w7
zip1 v18.4s, v2.4s, v3.4s
+ eor a2, a2, w8
zip2 v19.4s, v2.4s, v3.4s
+ eor a3, a3, w9
+ ldp w6, w7, [x2, #-48]
zip1 v20.4s, v4.4s, v5.4s
+ ldp w8, w9, [x2, #-40]
+ eor a4, a4, w6
zip2 v21.4s, v4.4s, v5.4s
+ eor a5, a5, w7
zip1 v22.4s, v6.4s, v7.4s
+ eor a6, a6, w8
zip2 v23.4s, v6.4s, v7.4s
+ eor a7, a7, w9
+ ldp w6, w7, [x2, #-32]
zip1 v24.4s, v8.4s, v9.4s
+ ldp w8, w9, [x2, #-24]
+ eor a8, a8, w6
zip2 v25.4s, v8.4s, v9.4s
+ eor a9, a9, w7
zip1 v26.4s, v10.4s, v11.4s
+ eor a10, a10, w8
zip2 v27.4s, v10.4s, v11.4s
+ eor a11, a11, w9
+ ldp w6, w7, [x2, #-16]
zip1 v28.4s, v12.4s, v13.4s
+ ldp w8, w9, [x2, #-8]
+ eor a12, a12, w6
zip2 v29.4s, v12.4s, v13.4s
+ eor a13, a13, w7
zip1 v30.4s, v14.4s, v15.4s
+ eor a14, a14, w8
zip2 v31.4s, v14.4s, v15.4s
+ eor a15, a15, w9
mov x3, #64
- subs x5, x4, #64
+ subs x5, x4, #128
add x6, x5, x2
csel x3, x3, xzr, ge
csel x2, x2, x6, ge
@@ -442,11 +633,13 @@ ENTRY(chacha_4block_xor_neon)
// interleave 64-bit words in state n, n+2
zip1 v0.2d, v16.2d, v18.2d
zip2 v4.2d, v16.2d, v18.2d
+ stp a0, a1, [x1], #64
zip1 v8.2d, v17.2d, v19.2d
zip2 v12.2d, v17.2d, v19.2d
+ stp a2, a3, [x1, #-56]
ld1 {v16.16b-v19.16b}, [x2], x3
- subs x6, x4, #128
+ subs x6, x4, #192
ccmp x3, xzr, #4, lt
add x7, x6, x2
csel x3, x3, xzr, eq
@@ -454,11 +647,13 @@ ENTRY(chacha_4block_xor_neon)
zip1 v1.2d, v20.2d, v22.2d
zip2 v5.2d, v20.2d, v22.2d
+ stp a4, a5, [x1, #-48]
zip1 v9.2d, v21.2d, v23.2d
zip2 v13.2d, v21.2d, v23.2d
+ stp a6, a7, [x1, #-40]
ld1 {v20.16b-v23.16b}, [x2], x3
- subs x7, x4, #192
+ subs x7, x4, #256
ccmp x3, xzr, #4, lt
add x8, x7, x2
csel x3, x3, xzr, eq
@@ -466,19 +661,23 @@ ENTRY(chacha_4block_xor_neon)
zip1 v2.2d, v24.2d, v26.2d
zip2 v6.2d, v24.2d, v26.2d
+ stp a8, a9, [x1, #-32]
zip1 v10.2d, v25.2d, v27.2d
zip2 v14.2d, v25.2d, v27.2d
+ stp a10, a11, [x1, #-24]
ld1 {v24.16b-v27.16b}, [x2], x3
- subs x8, x4, #256
+ subs x8, x4, #320
ccmp x3, xzr, #4, lt
add x9, x8, x2
csel x2, x2, x9, eq
zip1 v3.2d, v28.2d, v30.2d
zip2 v7.2d, v28.2d, v30.2d
+ stp a12, a13, [x1, #-16]
zip1 v11.2d, v29.2d, v31.2d
zip2 v15.2d, v29.2d, v31.2d
+ stp a14, a15, [x1, #-8]
ld1 {v28.16b-v31.16b}, [x2]
// xor with corresponding input, write to output
@@ -488,6 +687,7 @@ ENTRY(chacha_4block_xor_neon)
eor v18.16b, v18.16b, v2.16b
eor v19.16b, v19.16b, v3.16b
st1 {v16.16b-v19.16b}, [x1], #64
+ cbz x5, .Lout
tbnz x6, #63, 1f
eor v20.16b, v20.16b, v4.16b
@@ -495,6 +695,7 @@ ENTRY(chacha_4block_xor_neon)
eor v22.16b, v22.16b, v6.16b
eor v23.16b, v23.16b, v7.16b
st1 {v20.16b-v23.16b}, [x1], #64
+ cbz x6, .Lout
tbnz x7, #63, 2f
eor v24.16b, v24.16b, v8.16b
@@ -502,6 +703,7 @@ ENTRY(chacha_4block_xor_neon)
eor v26.16b, v26.16b, v10.16b
eor v27.16b, v27.16b, v11.16b
st1 {v24.16b-v27.16b}, [x1], #64
+ cbz x7, .Lout
tbnz x8, #63, 3f
eor v28.16b, v28.16b, v12.16b
@@ -510,9 +712,10 @@ ENTRY(chacha_4block_xor_neon)
eor v31.16b, v31.16b, v15.16b
st1 {v28.16b-v31.16b}, [x1]
+.Lout: frame_pop
ret
- // fewer than 64 bytes of in/output
+ // fewer than 128 bytes of in/output
0: ld1 {v8.16b}, [x10]
ld1 {v9.16b}, [x11]
movi v10.16b, #16
@@ -539,9 +742,9 @@ ENTRY(chacha_4block_xor_neon)
eor v22.16b, v22.16b, v6.16b
eor v23.16b, v23.16b, v7.16b
st1 {v20.16b-v23.16b}, [x1]
- ret
+ b .Lout
- // fewer than 128 bytes of in/output
+ // fewer than 192 bytes of in/output
1: ld1 {v8.16b}, [x10]
ld1 {v9.16b}, [x11]
movi v10.16b, #16
@@ -566,9 +769,9 @@ ENTRY(chacha_4block_xor_neon)
eor v22.16b, v22.16b, v2.16b
eor v23.16b, v23.16b, v3.16b
st1 {v20.16b-v23.16b}, [x1]
- ret
+ b .Lout
- // fewer than 192 bytes of in/output
+ // fewer than 256 bytes of in/output
2: ld1 {v4.16b}, [x10]
ld1 {v5.16b}, [x11]
movi v6.16b, #16
@@ -593,9 +796,9 @@ ENTRY(chacha_4block_xor_neon)
eor v26.16b, v26.16b, v2.16b
eor v27.16b, v27.16b, v3.16b
st1 {v24.16b-v27.16b}, [x1]
- ret
+ b .Lout
- // fewer than 256 bytes of in/output
+ // fewer than 320 bytes of in/output
3: ld1 {v4.16b}, [x10]
ld1 {v5.16b}, [x11]
movi v6.16b, #16
@@ -620,7 +823,7 @@ ENTRY(chacha_4block_xor_neon)
eor v30.16b, v30.16b, v2.16b
eor v31.16b, v31.16b, v3.16b
st1 {v28.16b-v31.16b}, [x1]
- ret
+ b .Lout
ENDPROC(chacha_4block_xor_neon)
.section ".rodata", "a", %progbits
@@ -632,5 +835,5 @@ ENDPROC(chacha_4block_xor_neon)
.set .Li, .Li + 1
.endr
-CTRINC: .word 0, 1, 2, 3
+CTRINC: .word 1, 2, 3, 4
ROT8: .word 0x02010003, 0x06050407, 0x0a09080b, 0x0e0d0c0f
@@ -38,22 +38,23 @@ asmlinkage void hchacha_block_neon(const u32 *state, u32 *out, int nrounds);
static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
int bytes, int nrounds)
{
- u8 buf[CHACHA_BLOCK_SIZE];
-
- if (bytes < CHACHA_BLOCK_SIZE) {
- memcpy(buf, src, bytes);
- chacha_block_xor_neon(state, buf, buf, nrounds);
- memcpy(dst, buf, bytes);
- return;
- }
-
while (bytes > 0) {
- chacha_4block_xor_neon(state, dst, src, nrounds,
- min(bytes, CHACHA_BLOCK_SIZE * 4));
- bytes -= CHACHA_BLOCK_SIZE * 4;
- src += CHACHA_BLOCK_SIZE * 4;
- dst += CHACHA_BLOCK_SIZE * 4;
- state[12] += 4;
+ int l = min(bytes, CHACHA_BLOCK_SIZE * 5);
+
+ if (l <= CHACHA_BLOCK_SIZE) {
+ u8 buf[CHACHA_BLOCK_SIZE];
+
+ memcpy(buf, src, l);
+ chacha_block_xor_neon(state, buf, buf, nrounds);
+ memcpy(dst, buf, l);
+ state[12] += 1;
+ break;
+ }
+ chacha_4block_xor_neon(state, dst, src, nrounds, l);
+ bytes -= CHACHA_BLOCK_SIZE * 5;
+ src += CHACHA_BLOCK_SIZE * 5;
+ dst += CHACHA_BLOCK_SIZE * 5;
+ state[12] += 5;
}
}
@@ -72,7 +73,7 @@ static int chacha_neon_stream_xor(struct skcipher_request *req,
unsigned int nbytes = walk.nbytes;
if (nbytes < walk.total)
- nbytes = round_down(nbytes, walk.stride);
+ nbytes = rounddown(nbytes, walk.stride);
kernel_neon_begin();
chacha_doneon(state, walk.dst.virt.addr, walk.src.virt.addr,
@@ -131,7 +132,7 @@ static struct skcipher_alg algs[] = {
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = CHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
- .walksize = 4 * CHACHA_BLOCK_SIZE,
+ .walksize = 5 * CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
.encrypt = chacha_neon,
.decrypt = chacha_neon,
@@ -147,7 +148,7 @@ static struct skcipher_alg algs[] = {
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
- .walksize = 4 * CHACHA_BLOCK_SIZE,
+ .walksize = 5 * CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
.encrypt = xchacha_neon,
.decrypt = xchacha_neon,
@@ -163,7 +164,7 @@ static struct skcipher_alg algs[] = {
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
- .walksize = 4 * CHACHA_BLOCK_SIZE,
+ .walksize = 5 * CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha12_setkey,
.encrypt = xchacha_neon,
.decrypt = xchacha_neon,
To some degree, most known AArch64 micro-architectures appear to be able to issue ALU instructions in parellel to SIMD instructions without affecting the SIMD throughput. This means we can use the ALU to process a fifth ChaCha block while the SIMD is processing four blocks in parallel. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/arm64/crypto/chacha-neon-core.S | 235 ++++++++++++++++++-- arch/arm64/crypto/chacha-neon-glue.c | 39 ++-- 2 files changed, 239 insertions(+), 35 deletions(-) -- 2.19.2