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perf(tea): use runtime.fastrand

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name          old time/op    new time/op    delta
TEAen/16-8       242ns ± 1%     225ns ± 2%  -6.98%  (p=0.008 n=5+5)
TEAen/256-8     1.71µs ± 0%    1.68µs ± 0%  -1.58%  (p=0.008 n=5+5)
TEAen/4K-8      25.0µs ± 1%    25.0µs ± 0%    ~     (p=1.000 n=5+5)
TEAen/32K-8      202µs ± 1%     202µs ± 0%    ~     (p=0.548 n=5+5)
TEAde/16-8       208ns ± 0%     207ns ± 0%    ~     (p=0.198 n=5+5)
TEAde/256-8     1.65µs ± 0%    1.64µs ± 0%  -0.39%  (p=0.048 n=5+5)
TEAde/4K-8      24.6µs ± 0%    24.6µs ± 1%    ~     (p=1.000 n=5+5)
TEAde/32K-8      199µs ± 0%     199µs ± 0%    ~     (p=0.905 n=4+5)

name          old speed      new speed      delta
TEAen/16-8    66.2MB/s ± 1%  71.2MB/s ± 2%  +7.51%  (p=0.008 n=5+5)
TEAen/256-8    150MB/s ± 0%   152MB/s ± 0%  +1.61%  (p=0.008 n=5+5)
TEAen/4K-8     164MB/s ± 1%   164MB/s ± 0%    ~     (p=1.000 n=5+5)
TEAen/32K-8    162MB/s ± 1%   162MB/s ± 0%    ~     (p=0.548 n=5+5)
TEAde/16-8     154MB/s ± 0%   154MB/s ± 0%    ~     (p=0.222 n=5+5)
TEAde/256-8    165MB/s ± 0%   165MB/s ± 0%    ~     (p=0.056 n=5+5)
TEAde/4K-8     167MB/s ± 0%   167MB/s ± 1%    ~     (p=1.000 n=5+5)
TEAde/32K-8    165MB/s ± 0%   165MB/s ± 0%    ~     (p=0.825 n=4+5)
This commit is contained in:
fumiama 2021-11-23 13:18:58 +08:00
parent ec4cd4a6f3
commit ec053573f1
1 changed files with 14 additions and 9 deletions
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23
binary/tea.go
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@ -2,11 +2,15 @@ package binary
import (
"encoding/binary"
"math/rand"
_ "unsafe" // required by go:linkname
)
type TEA [4]uint32
// Uint32 returns a lock free uint32 value.
//go:linkname Uint32 runtime.fastrand
func Uint32() uint32
// Encrypt tea 加密
// http://bbs.chinaunix.net/thread-583468-1-1.html
// 感谢xichen大佬对TEA的解释
@ -14,7 +18,9 @@ func (t TEA) Encrypt(src []byte) (dst []byte) {
lens := len(src)
fill := 10 - (lens+1)%8
dst = make([]byte, fill+lens+7)
_, _ = rand.Read(dst[0:fill])
binary.LittleEndian.PutUint32(dst, Uint32())
binary.LittleEndian.PutUint32(dst[4:], Uint32())
binary.LittleEndian.PutUint32(dst[8:], Uint32())
dst[0] = byte(fill-3) | 0xF8 // 存储pad长度
copy(dst[fill:], src)
@ -36,14 +42,13 @@ func (t TEA) Decrypt(data []byte) []byte {
return nil
}
dst := make([]byte, len(data))
var iv1, iv2, holder, tmp uint64
var iv1, iv2, holder uint64
for i := 0; i < len(dst); i += 8 {
block := binary.BigEndian.Uint64(data[i:])
tmp = t.decode(block ^ iv2)
iv2 = tmp
holder = tmp ^ iv1
iv1 = block
binary.BigEndian.PutUint64(dst[i:], holder)
iv1 = binary.BigEndian.Uint64(data[i:])
iv2 ^= iv1
iv2 = t.decode(iv2)
binary.BigEndian.PutUint64(dst[i:], iv2^holder)
holder = iv1
}
return dst[dst[0]&7+3 : len(data)-7]
}