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crypto/rc4: naïve ARM assembly implementation
On 800MHz Cortex-A8: benchmark old ns/op new ns/op delta BenchmarkRC4_128 9395 2838 -69.79% BenchmarkRC4_1K 74497 22120 -70.31% BenchmarkRC4_8K 587243 171435 -70.81% benchmark old MB/s new MB/s speedup BenchmarkRC4_128 13.62 45.09 3.31x BenchmarkRC4_1K 13.75 46.29 3.37x BenchmarkRC4_8K 13.79 47.22 3.42x Result for "OpenSSL 1.0.1c 10 May 2012" from Debian/armhf sid: type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes rc4 39553.81k 46522.39k 49336.11k 50085.63k 50258.06k R=golang-dev, agl, dave CC=golang-dev https://golang.org/cl/7310051
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src/pkg/crypto/rc4/rc4_arm.s
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58
src/pkg/crypto/rc4/rc4_arm.s
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@ -0,0 +1,58 @@
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Registers
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dst = 0
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src = 1
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n = 2
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state = 3
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pi = 4
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pj = 5
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i = 6
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j = 7
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k = 8
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t = 11
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t2 = 12
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// func xorKeyStream(dst, src *byte, n int, state *[256]byte, i, j *uint8)
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TEXT ·xorKeyStream(SB),7,$0
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MOVW 0(FP), R(dst)
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MOVW 4(FP), R(src)
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MOVW 8(FP), R(n)
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MOVW 12(FP), R(state)
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MOVW 16(FP), R(pi)
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MOVW 20(FP), R(pj)
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MOVBU (R(pi)), R(i)
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MOVBU (R(pj)), R(j)
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MOVW $0, R(k)
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loop:
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// i += 1; j += state[i]
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ADD $1, R(i)
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AND $0xff, R(i)
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MOVBU R(i)<<0(R(state)), R(t)
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ADD R(t), R(j)
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AND $0xff, R(j)
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// swap state[i] <-> state[j]
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MOVBU R(j)<<0(R(state)), R(t2)
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MOVB R(t2), R(i)<<0(R(state))
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MOVB R(t), R(j)<<0(R(state))
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// dst[k] = src[k] ^ state[state[i] + state[j]]
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ADD R(t2), R(t)
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AND $0xff, R(t)
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MOVBU R(t)<<0(R(state)), R(t)
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MOVBU R(k)<<0(R(src)), R(t2)
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EOR R(t), R(t2)
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MOVB R(t2), R(k)<<0(R(dst))
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ADD $1, R(k)
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CMP R(k), R(n)
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BNE loop
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done:
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MOVB R(i), (R(pi))
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MOVB R(j), (R(pj))
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RET
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@ -2,7 +2,7 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build amd64
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// +build amd64 arm
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package rc4
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@ -2,7 +2,7 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !amd64
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// +build !amd64,!arm
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package rc4
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