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crypto/sha512: speed-up for very small blocks

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Similar to https://golang.org/cl/54391, but for sha512
name          old time/op    new time/op    delta
Hash8Bytes-8     289ns ± 1%     253ns ± 2%  -12.59%  (p=0.000 n=10+10)
Hash1K-8        1.85µs ± 1%    1.82µs ± 1%   -1.77%  (p=0.000 n=9+10)
Hash8K-8        12.7µs ± 2%    12.5µs ± 1%     ~     (p=0.075 n=10+10)

name          old speed      new speed      delta
Hash8Bytes-8  27.6MB/s ± 1%  31.6MB/s ± 2%  +14.43%  (p=0.000 n=10+10)
Hash1K-8       554MB/s ± 1%   564MB/s ± 1%   +1.81%  (p=0.000 n=9+10)
Hash8K-8       647MB/s ± 2%   653MB/s ± 1%     ~     (p=0.075 n=10+10)

Change-Id: I437668c96ad55f8dbb62c89c8fc3f433453b5330
Reviewed-on: https://go-review.googlesource.com/82996
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <hi@filippo.io>
This commit is contained in:
Ilya Tocar 2017-12-08 14:59:55 -06:00 committed by Filippo Valsorda
parent e476e110ab
commit b43ebce59b
1 changed files with 25 additions and 27 deletions
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52
src/crypto/sha512/sha512.go
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@ -195,17 +195,21 @@ func (d *digest) UnmarshalBinary(b []byte) error {
return nil
}
func putUint64(x []byte, s uint64) {
_ = x[7]
x[0] = byte(s >> 56)
x[1] = byte(s >> 48)
x[2] = byte(s >> 40)
x[3] = byte(s >> 32)
x[4] = byte(s >> 24)
x[5] = byte(s >> 16)
x[6] = byte(s >> 8)
x[7] = byte(s)
}
func appendUint64(b []byte, x uint64) []byte {
a := [8]byte{
byte(x >> 56),
byte(x >> 48),
byte(x >> 40),
byte(x >> 32),
byte(x >> 24),
byte(x >> 16),
byte(x >> 8),
byte(x),
}
var a [8]byte
putUint64(a[:], x)
return append(b, a[:]...)
}
@ -312,30 +316,24 @@ func (d *digest) checkSum() [Size]byte {
// Length in bits.
len <<= 3
for i := uint(0); i < 16; i++ {
tmp[i] = byte(len >> (120 - 8*i))
}
putUint64(tmp[0:], 0) // upper 64 bits are always zero, because len variable has type uint64
putUint64(tmp[8:], len)
d.Write(tmp[0:16])
if d.nx != 0 {
panic("d.nx != 0")
}
h := d.h[:]
if d.function == crypto.SHA384 {
h = d.h[:6]
}
var digest [Size]byte
for i, s := range h {
digest[i*8] = byte(s >> 56)
digest[i*8+1] = byte(s >> 48)
digest[i*8+2] = byte(s >> 40)
digest[i*8+3] = byte(s >> 32)
digest[i*8+4] = byte(s >> 24)
digest[i*8+5] = byte(s >> 16)
digest[i*8+6] = byte(s >> 8)
digest[i*8+7] = byte(s)
putUint64(digest[0:], d.h[0])
putUint64(digest[8:], d.h[1])
putUint64(digest[16:], d.h[2])
putUint64(digest[24:], d.h[3])
putUint64(digest[32:], d.h[4])
putUint64(digest[40:], d.h[5])
if d.function != crypto.SHA384 {
putUint64(digest[48:], d.h[6])
putUint64(digest[56:], d.h[7])
}
return digest