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SHA-3: speedups (#47)

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* add function for one-off calculation

* sha3: simplifies Read function

* sha3: remove if from Read
This commit is contained in:
Henry Case 2020-10-03 23:27:08 +01:00 committed by GitHub
parent 45bc1a75f6
commit 8474981cfc
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 19 deletions
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24
hash/sha3/sha3.go
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@ -157,44 +157,36 @@ func (c *state) Read(out []byte) (nread int, err error) {
rate := c.BlockSize() rate := c.BlockSize()
nread = len(out) nread = len(out)
// finalize if not done yet
if !c.isSquezing { if !c.isSquezing {
c.finalize_sha3() c.finalize_sha3()
} }
// Copy-out bytes that are still kept in the buffer // Copy-out bytes that are still kept in the buffer
if c.idx != 0 {
l := min(c.idx, len(out)) l := min(c.idx, len(out))
idx := rate - c.idx copy(out, buf[rate-c.idx:rate-c.idx+l])
copy(out, buf[idx:idx+l])
out = out[l:] out = out[l:]
c.idx -= l c.idx -= l
}
l := len(out) if len(out) == 0 {
if l == 0 {
// nothing else todo // nothing else todo
return nread, nil return nread, nil
} }
// copy out full blocks and squeeze. at this point // copy out full blocks and squeeze. at this point
// there is no more data in the buffer. // there is no more data in the buffer.
nblocks := l / rate nblocks := len(out) / rate
for i := 0; i < nblocks; i++ { for nblocks > 0 {
keccakF1600(&c.a) keccakF1600(&c.a)
copyOut(c, out[:rate]) copyOut(c, out[:rate])
out = out[rate:] out = out[rate:]
} nblocks--
// produce more if needed
l = len(out)
if l == 0 {
return nread, nil
} }
keccakF1600(&c.a) keccakF1600(&c.a)
copyOut(c, buf) copyOut(c, buf)
copy(out, buf[:l]) copy(out, buf[:len(out)])
c.idx = rate - l c.idx = rate - len(out)
return nread, nil return nread, nil
} }