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sm3: reduce Write calls in Sum

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Sun Yimin 2022-11-22 08:42:17 +08:00 committed by GitHub
parent f1993bc41a
commit 57882bbdbc
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1 changed files with 7 additions and 5 deletions
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12
sm3/sm3.go
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@ -129,17 +129,19 @@ func (d *digest) Sum(in []byte) []byte {
func (d *digest) checkSum() [Size]byte {
len := d.len
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
var tmp [64]byte
var tmp [64 + 8]byte // padding + length buffer
tmp[0] = 0x80
var t uint64
if len%64 < 56 {
d.Write(tmp[0 : 56-len%64])
t = 56 - len%64
} else {
d.Write(tmp[0 : 64+56-len%64])
t = 64 + 56 - len%64
}
// Length in bits.
len <<= 3
binary.BigEndian.PutUint64(tmp[:], len)
d.Write(tmp[0:8])
padlen := tmp[:t+8]
binary.BigEndian.PutUint64(padlen[t:], len)
d.Write(padlen)
if d.nx != 0 {
panic("d.nx != 0")