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sm3: kdf, reduce memory allocation times #220

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Sun Yimin 2024-05-15 09:36:38 +08:00 committed by GitHub
parent 4fe8d28d31
commit 105331f164
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1 changed files with 3 additions and 3 deletions
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sm3/sm3.go
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@ -220,7 +220,7 @@ func Kdf(z []byte, keyLen int) []byte {
}
var countBytes [4]byte
var ct uint32 = 1
var k []byte
k := make([]byte, keyLen)
baseMD := new(digest)
baseMD.Reset()
baseMD.Write(z)
@ -229,8 +229,8 @@ func Kdf(z []byte, keyLen int) []byte {
md := *baseMD
md.Write(countBytes[:])
h := md.checkSum()
k = append(k, h[:]...)
copy(k[i*Size:], h[:])
ct++
}
return k[:keyLen]
return k
}