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Optimize decryptObjectInfo (#10726)

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`decryptObjectInfo` is a significant bottleneck when listing objects.

Reduce the allocations for a significant speedup.

https://github.com/minio/sio/pull/40

```
λ benchcmp before.txt after.txt
benchmark                          old ns/op     new ns/op     delta
Benchmark_decryptObjectInfo-32     24260928      808656        -96.67%

benchmark                          old MB/s     new MB/s     speedup
Benchmark_decryptObjectInfo-32     0.04         1.24         31.00x

benchmark                          old allocs     new allocs     delta
Benchmark_decryptObjectInfo-32     75112          48996          -34.77%

benchmark                          old bytes     new bytes     delta
Benchmark_decryptObjectInfo-32     287694772     4228076       -98.53%
```
This commit is contained in:
Klaus Post
2020-10-29 09:34:20 -07:00
committed by GitHub
parent 4bf90ca67f
commit 6b14c4ab1e
10 changed files with 195 additions and 35 deletions
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10
cmd/crypto/kes.go
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@@ -177,11 +177,10 @@ func (kes *kesService) CreateKey(keyID string) error { return kes.client.CreateK
// named key referenced by keyID. It also binds the generated key
// cryptographically to the provided context.
func (kes *kesService) GenerateKey(keyID string, ctx Context) (key [32]byte, sealedKey []byte, err error) {
var context bytes.Buffer
ctx.WriteTo(&context)
context := ctx.AppendTo(make([]byte, 0, 128))
var plainKey []byte
plainKey, sealedKey, err = kes.client.GenerateDataKey(keyID, context.Bytes())
plainKey, sealedKey, err = kes.client.GenerateDataKey(keyID, context)
if err != nil {
return key, nil, err
}
@@ -200,11 +199,10 @@ func (kes *kesService) GenerateKey(keyID string, ctx Context) (key [32]byte, sea
// The context must be same context as the one provided while
// generating the plaintext key / sealedKey.
func (kes *kesService) UnsealKey(keyID string, sealedKey []byte, ctx Context) (key [32]byte, err error) {
var context bytes.Buffer
ctx.WriteTo(&context)
context := ctx.AppendTo(make([]byte, 0, 128))
var plainKey []byte
plainKey, err = kes.client.DecryptDataKey(keyID, sealedKey, context.Bytes())
plainKey, err = kes.client.DecryptDataKey(keyID, sealedKey, context)
if err != nil {
return key, err
}