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https://github.com/edk2-porting/linux-next.git
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b7171ce9eb
This is a straight port to arm64/NEON of the x86 SSE3 implementation of the ChaCha20 stream cipher. It uses the new skcipher walksize attribute to process the input in strides of 4x the block size. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
451 lines
11 KiB
ArmAsm
451 lines
11 KiB
ArmAsm
/*
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* ChaCha20 256-bit cipher algorithm, RFC7539, arm64 NEON functions
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*
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* Copyright (C) 2016 Linaro, Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Based on:
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* ChaCha20 256-bit cipher algorithm, RFC7539, x64 SSSE3 functions
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*
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* Copyright (C) 2015 Martin Willi
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/linkage.h>
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.text
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.align 6
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ENTRY(chacha20_block_xor_neon)
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// x0: Input state matrix, s
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// x1: 1 data block output, o
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// x2: 1 data block input, i
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//
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// This function encrypts one ChaCha20 block by loading the state matrix
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// in four NEON registers. It performs matrix operation on four words in
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// parallel, but requires shuffling to rearrange the words after each
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// round.
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//
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// x0..3 = s0..3
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adr x3, ROT8
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ld1 {v0.4s-v3.4s}, [x0]
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ld1 {v8.4s-v11.4s}, [x0]
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ld1 {v12.4s}, [x3]
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mov x3, #10
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.Ldoubleround:
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// x0 += x1, x3 = rotl32(x3 ^ x0, 16)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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rev32 v3.8h, v3.8h
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// x2 += x3, x1 = rotl32(x1 ^ x2, 12)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #12
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sri v1.4s, v4.4s, #20
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// x0 += x1, x3 = rotl32(x3 ^ x0, 8)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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tbl v3.16b, {v3.16b}, v12.16b
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// x2 += x3, x1 = rotl32(x1 ^ x2, 7)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #7
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sri v1.4s, v4.4s, #25
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// x1 = shuffle32(x1, MASK(0, 3, 2, 1))
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ext v1.16b, v1.16b, v1.16b, #4
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// x2 = shuffle32(x2, MASK(1, 0, 3, 2))
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ext v2.16b, v2.16b, v2.16b, #8
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// x3 = shuffle32(x3, MASK(2, 1, 0, 3))
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ext v3.16b, v3.16b, v3.16b, #12
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// x0 += x1, x3 = rotl32(x3 ^ x0, 16)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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rev32 v3.8h, v3.8h
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// x2 += x3, x1 = rotl32(x1 ^ x2, 12)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #12
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sri v1.4s, v4.4s, #20
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// x0 += x1, x3 = rotl32(x3 ^ x0, 8)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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tbl v3.16b, {v3.16b}, v12.16b
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// x2 += x3, x1 = rotl32(x1 ^ x2, 7)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #7
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sri v1.4s, v4.4s, #25
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// x1 = shuffle32(x1, MASK(2, 1, 0, 3))
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ext v1.16b, v1.16b, v1.16b, #12
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// x2 = shuffle32(x2, MASK(1, 0, 3, 2))
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ext v2.16b, v2.16b, v2.16b, #8
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// x3 = shuffle32(x3, MASK(0, 3, 2, 1))
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ext v3.16b, v3.16b, v3.16b, #4
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subs x3, x3, #1
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b.ne .Ldoubleround
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ld1 {v4.16b-v7.16b}, [x2]
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// o0 = i0 ^ (x0 + s0)
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add v0.4s, v0.4s, v8.4s
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eor v0.16b, v0.16b, v4.16b
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// o1 = i1 ^ (x1 + s1)
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add v1.4s, v1.4s, v9.4s
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eor v1.16b, v1.16b, v5.16b
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// o2 = i2 ^ (x2 + s2)
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add v2.4s, v2.4s, v10.4s
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eor v2.16b, v2.16b, v6.16b
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// o3 = i3 ^ (x3 + s3)
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add v3.4s, v3.4s, v11.4s
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eor v3.16b, v3.16b, v7.16b
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st1 {v0.16b-v3.16b}, [x1]
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ret
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ENDPROC(chacha20_block_xor_neon)
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.align 6
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ENTRY(chacha20_4block_xor_neon)
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// x0: Input state matrix, s
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// x1: 4 data blocks output, o
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// x2: 4 data blocks input, i
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//
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// This function encrypts four consecutive ChaCha20 blocks by loading
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// the state matrix in NEON registers four times. The algorithm performs
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// each operation on the corresponding word of each state matrix, hence
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// requires no word shuffling. For final XORing step we transpose the
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// matrix by interleaving 32- and then 64-bit words, which allows us to
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// do XOR in NEON registers.
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//
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adr x3, CTRINC // ... and ROT8
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ld1 {v30.4s-v31.4s}, [x3]
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// x0..15[0-3] = s0..3[0..3]
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mov x4, x0
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ld4r { v0.4s- v3.4s}, [x4], #16
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ld4r { v4.4s- v7.4s}, [x4], #16
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ld4r { v8.4s-v11.4s}, [x4], #16
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ld4r {v12.4s-v15.4s}, [x4]
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// x12 += counter values 0-3
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add v12.4s, v12.4s, v30.4s
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mov x3, #10
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.Ldoubleround4:
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// x0 += x4, x12 = rotl32(x12 ^ x0, 16)
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// x1 += x5, x13 = rotl32(x13 ^ x1, 16)
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// x2 += x6, x14 = rotl32(x14 ^ x2, 16)
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// x3 += x7, x15 = rotl32(x15 ^ x3, 16)
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add v0.4s, v0.4s, v4.4s
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add v1.4s, v1.4s, v5.4s
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add v2.4s, v2.4s, v6.4s
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add v3.4s, v3.4s, v7.4s
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eor v12.16b, v12.16b, v0.16b
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eor v13.16b, v13.16b, v1.16b
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eor v14.16b, v14.16b, v2.16b
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eor v15.16b, v15.16b, v3.16b
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rev32 v12.8h, v12.8h
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rev32 v13.8h, v13.8h
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rev32 v14.8h, v14.8h
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rev32 v15.8h, v15.8h
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// x8 += x12, x4 = rotl32(x4 ^ x8, 12)
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// x9 += x13, x5 = rotl32(x5 ^ x9, 12)
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// x10 += x14, x6 = rotl32(x6 ^ x10, 12)
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// x11 += x15, x7 = rotl32(x7 ^ x11, 12)
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add v8.4s, v8.4s, v12.4s
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add v9.4s, v9.4s, v13.4s
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add v10.4s, v10.4s, v14.4s
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add v11.4s, v11.4s, v15.4s
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eor v16.16b, v4.16b, v8.16b
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eor v17.16b, v5.16b, v9.16b
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eor v18.16b, v6.16b, v10.16b
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eor v19.16b, v7.16b, v11.16b
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shl v4.4s, v16.4s, #12
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shl v5.4s, v17.4s, #12
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shl v6.4s, v18.4s, #12
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shl v7.4s, v19.4s, #12
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sri v4.4s, v16.4s, #20
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sri v5.4s, v17.4s, #20
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sri v6.4s, v18.4s, #20
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sri v7.4s, v19.4s, #20
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// x0 += x4, x12 = rotl32(x12 ^ x0, 8)
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// x1 += x5, x13 = rotl32(x13 ^ x1, 8)
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// x2 += x6, x14 = rotl32(x14 ^ x2, 8)
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// x3 += x7, x15 = rotl32(x15 ^ x3, 8)
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add v0.4s, v0.4s, v4.4s
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add v1.4s, v1.4s, v5.4s
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add v2.4s, v2.4s, v6.4s
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add v3.4s, v3.4s, v7.4s
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eor v12.16b, v12.16b, v0.16b
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eor v13.16b, v13.16b, v1.16b
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eor v14.16b, v14.16b, v2.16b
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eor v15.16b, v15.16b, v3.16b
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tbl v12.16b, {v12.16b}, v31.16b
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tbl v13.16b, {v13.16b}, v31.16b
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tbl v14.16b, {v14.16b}, v31.16b
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tbl v15.16b, {v15.16b}, v31.16b
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// x8 += x12, x4 = rotl32(x4 ^ x8, 7)
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// x9 += x13, x5 = rotl32(x5 ^ x9, 7)
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// x10 += x14, x6 = rotl32(x6 ^ x10, 7)
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// x11 += x15, x7 = rotl32(x7 ^ x11, 7)
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add v8.4s, v8.4s, v12.4s
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add v9.4s, v9.4s, v13.4s
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add v10.4s, v10.4s, v14.4s
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add v11.4s, v11.4s, v15.4s
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eor v16.16b, v4.16b, v8.16b
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eor v17.16b, v5.16b, v9.16b
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eor v18.16b, v6.16b, v10.16b
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eor v19.16b, v7.16b, v11.16b
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shl v4.4s, v16.4s, #7
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shl v5.4s, v17.4s, #7
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shl v6.4s, v18.4s, #7
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shl v7.4s, v19.4s, #7
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sri v4.4s, v16.4s, #25
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sri v5.4s, v17.4s, #25
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sri v6.4s, v18.4s, #25
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sri v7.4s, v19.4s, #25
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// x0 += x5, x15 = rotl32(x15 ^ x0, 16)
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// x1 += x6, x12 = rotl32(x12 ^ x1, 16)
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// x2 += x7, x13 = rotl32(x13 ^ x2, 16)
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// x3 += x4, x14 = rotl32(x14 ^ x3, 16)
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add v0.4s, v0.4s, v5.4s
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add v1.4s, v1.4s, v6.4s
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add v2.4s, v2.4s, v7.4s
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add v3.4s, v3.4s, v4.4s
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eor v15.16b, v15.16b, v0.16b
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eor v12.16b, v12.16b, v1.16b
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eor v13.16b, v13.16b, v2.16b
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eor v14.16b, v14.16b, v3.16b
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rev32 v15.8h, v15.8h
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rev32 v12.8h, v12.8h
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rev32 v13.8h, v13.8h
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rev32 v14.8h, v14.8h
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// x10 += x15, x5 = rotl32(x5 ^ x10, 12)
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// x11 += x12, x6 = rotl32(x6 ^ x11, 12)
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// x8 += x13, x7 = rotl32(x7 ^ x8, 12)
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// x9 += x14, x4 = rotl32(x4 ^ x9, 12)
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add v10.4s, v10.4s, v15.4s
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add v11.4s, v11.4s, v12.4s
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add v8.4s, v8.4s, v13.4s
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add v9.4s, v9.4s, v14.4s
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eor v16.16b, v5.16b, v10.16b
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eor v17.16b, v6.16b, v11.16b
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eor v18.16b, v7.16b, v8.16b
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eor v19.16b, v4.16b, v9.16b
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shl v5.4s, v16.4s, #12
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shl v6.4s, v17.4s, #12
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shl v7.4s, v18.4s, #12
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shl v4.4s, v19.4s, #12
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sri v5.4s, v16.4s, #20
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sri v6.4s, v17.4s, #20
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sri v7.4s, v18.4s, #20
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sri v4.4s, v19.4s, #20
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// x0 += x5, x15 = rotl32(x15 ^ x0, 8)
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// x1 += x6, x12 = rotl32(x12 ^ x1, 8)
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// x2 += x7, x13 = rotl32(x13 ^ x2, 8)
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// x3 += x4, x14 = rotl32(x14 ^ x3, 8)
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add v0.4s, v0.4s, v5.4s
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add v1.4s, v1.4s, v6.4s
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add v2.4s, v2.4s, v7.4s
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add v3.4s, v3.4s, v4.4s
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eor v15.16b, v15.16b, v0.16b
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eor v12.16b, v12.16b, v1.16b
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eor v13.16b, v13.16b, v2.16b
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eor v14.16b, v14.16b, v3.16b
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tbl v15.16b, {v15.16b}, v31.16b
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tbl v12.16b, {v12.16b}, v31.16b
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tbl v13.16b, {v13.16b}, v31.16b
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tbl v14.16b, {v14.16b}, v31.16b
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// x10 += x15, x5 = rotl32(x5 ^ x10, 7)
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// x11 += x12, x6 = rotl32(x6 ^ x11, 7)
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// x8 += x13, x7 = rotl32(x7 ^ x8, 7)
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// x9 += x14, x4 = rotl32(x4 ^ x9, 7)
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add v10.4s, v10.4s, v15.4s
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add v11.4s, v11.4s, v12.4s
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add v8.4s, v8.4s, v13.4s
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add v9.4s, v9.4s, v14.4s
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eor v16.16b, v5.16b, v10.16b
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eor v17.16b, v6.16b, v11.16b
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eor v18.16b, v7.16b, v8.16b
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eor v19.16b, v4.16b, v9.16b
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shl v5.4s, v16.4s, #7
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shl v6.4s, v17.4s, #7
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shl v7.4s, v18.4s, #7
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shl v4.4s, v19.4s, #7
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sri v5.4s, v16.4s, #25
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sri v6.4s, v17.4s, #25
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sri v7.4s, v18.4s, #25
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sri v4.4s, v19.4s, #25
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subs x3, x3, #1
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b.ne .Ldoubleround4
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ld4r {v16.4s-v19.4s}, [x0], #16
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ld4r {v20.4s-v23.4s}, [x0], #16
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// x12 += counter values 0-3
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add v12.4s, v12.4s, v30.4s
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// x0[0-3] += s0[0]
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// x1[0-3] += s0[1]
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// x2[0-3] += s0[2]
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// x3[0-3] += s0[3]
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add v0.4s, v0.4s, v16.4s
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add v1.4s, v1.4s, v17.4s
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add v2.4s, v2.4s, v18.4s
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add v3.4s, v3.4s, v19.4s
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ld4r {v24.4s-v27.4s}, [x0], #16
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ld4r {v28.4s-v31.4s}, [x0]
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// x4[0-3] += s1[0]
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// x5[0-3] += s1[1]
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// x6[0-3] += s1[2]
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// x7[0-3] += s1[3]
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add v4.4s, v4.4s, v20.4s
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add v5.4s, v5.4s, v21.4s
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add v6.4s, v6.4s, v22.4s
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add v7.4s, v7.4s, v23.4s
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// x8[0-3] += s2[0]
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// x9[0-3] += s2[1]
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// x10[0-3] += s2[2]
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// x11[0-3] += s2[3]
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add v8.4s, v8.4s, v24.4s
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add v9.4s, v9.4s, v25.4s
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add v10.4s, v10.4s, v26.4s
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add v11.4s, v11.4s, v27.4s
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// x12[0-3] += s3[0]
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// x13[0-3] += s3[1]
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// x14[0-3] += s3[2]
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// x15[0-3] += s3[3]
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add v12.4s, v12.4s, v28.4s
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add v13.4s, v13.4s, v29.4s
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add v14.4s, v14.4s, v30.4s
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add v15.4s, v15.4s, v31.4s
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// interleave 32-bit words in state n, n+1
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zip1 v16.4s, v0.4s, v1.4s
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zip2 v17.4s, v0.4s, v1.4s
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zip1 v18.4s, v2.4s, v3.4s
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zip2 v19.4s, v2.4s, v3.4s
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zip1 v20.4s, v4.4s, v5.4s
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zip2 v21.4s, v4.4s, v5.4s
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zip1 v22.4s, v6.4s, v7.4s
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zip2 v23.4s, v6.4s, v7.4s
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zip1 v24.4s, v8.4s, v9.4s
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zip2 v25.4s, v8.4s, v9.4s
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zip1 v26.4s, v10.4s, v11.4s
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zip2 v27.4s, v10.4s, v11.4s
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zip1 v28.4s, v12.4s, v13.4s
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zip2 v29.4s, v12.4s, v13.4s
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zip1 v30.4s, v14.4s, v15.4s
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zip2 v31.4s, v14.4s, v15.4s
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|
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// interleave 64-bit words in state n, n+2
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|
zip1 v0.2d, v16.2d, v18.2d
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zip2 v4.2d, v16.2d, v18.2d
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zip1 v8.2d, v17.2d, v19.2d
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zip2 v12.2d, v17.2d, v19.2d
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ld1 {v16.16b-v19.16b}, [x2], #64
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zip1 v1.2d, v20.2d, v22.2d
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zip2 v5.2d, v20.2d, v22.2d
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zip1 v9.2d, v21.2d, v23.2d
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zip2 v13.2d, v21.2d, v23.2d
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ld1 {v20.16b-v23.16b}, [x2], #64
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|
|
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zip1 v2.2d, v24.2d, v26.2d
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zip2 v6.2d, v24.2d, v26.2d
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|
zip1 v10.2d, v25.2d, v27.2d
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zip2 v14.2d, v25.2d, v27.2d
|
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ld1 {v24.16b-v27.16b}, [x2], #64
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|
|
|
zip1 v3.2d, v28.2d, v30.2d
|
|
zip2 v7.2d, v28.2d, v30.2d
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|
zip1 v11.2d, v29.2d, v31.2d
|
|
zip2 v15.2d, v29.2d, v31.2d
|
|
ld1 {v28.16b-v31.16b}, [x2]
|
|
|
|
// xor with corresponding input, write to output
|
|
eor v16.16b, v16.16b, v0.16b
|
|
eor v17.16b, v17.16b, v1.16b
|
|
eor v18.16b, v18.16b, v2.16b
|
|
eor v19.16b, v19.16b, v3.16b
|
|
eor v20.16b, v20.16b, v4.16b
|
|
eor v21.16b, v21.16b, v5.16b
|
|
st1 {v16.16b-v19.16b}, [x1], #64
|
|
eor v22.16b, v22.16b, v6.16b
|
|
eor v23.16b, v23.16b, v7.16b
|
|
eor v24.16b, v24.16b, v8.16b
|
|
eor v25.16b, v25.16b, v9.16b
|
|
st1 {v20.16b-v23.16b}, [x1], #64
|
|
eor v26.16b, v26.16b, v10.16b
|
|
eor v27.16b, v27.16b, v11.16b
|
|
eor v28.16b, v28.16b, v12.16b
|
|
st1 {v24.16b-v27.16b}, [x1], #64
|
|
eor v29.16b, v29.16b, v13.16b
|
|
eor v30.16b, v30.16b, v14.16b
|
|
eor v31.16b, v31.16b, v15.16b
|
|
st1 {v28.16b-v31.16b}, [x1]
|
|
|
|
ret
|
|
ENDPROC(chacha20_4block_xor_neon)
|
|
|
|
CTRINC: .word 0, 1, 2, 3
|
|
ROT8: .word 0x02010003, 0x06050407, 0x0a09080b, 0x0e0d0c0f
|