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add function for one-off calculation

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This commit is contained in:
Henry Case 2020-10-03 05:40:47 +01:00
parent 24408329a5
commit cccb9890e1
1 changed files with 34 additions and 12 deletions
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32
hash/sha3/sha3.go
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@ -132,14 +132,10 @@ func (c *state) Write(in []byte) (nwrite int, err error) {
return nwrite, nil
}
// Read changes state of the hash if called first time. It will
// return len(out) bytes of data. Never fails.
func (c *state) Read(out []byte) (nread int, err error) {
func (c *state) finalize_sha3() {
buf := c.data.asBytes()[:]
rate := c.BlockSize()
nread = len(out)
if !c.isSquezing {
// there is at least one byte free, otherise
// buf would be squezed already
for i := c.idx + 1; i < rate; i++ {
@ -154,6 +150,17 @@ func (c *state) Read(out []byte) (nread int, err error) {
c.isSquezing = true
}
// Read changes state of the hash if called first time. It will
// return len(out) bytes of data. Never fails.
func (c *state) Read(out []byte) (nread int, err error) {
buf := c.data.asBytes()[:]
rate := c.BlockSize()
nread = len(out)
if !c.isSquezing {
c.finalize_sha3()
}
// Copy-out bytes that are still kept in the buffer
if c.idx != 0 {
l := min(c.idx, len(out))
@ -211,6 +218,21 @@ func (c *state) Sum(in []byte) []byte {
return in
}
func (c *state) digest(out, in []byte) {
nread := len(out)
rate := c.BlockSize()
nblocks := nread / rate
c.Write(in)
c.finalize_sha3()
for i := 0; i < nblocks-1; i++ {
keccakF1600(&c.a)
copyOut(c, out[:])
out = out[rate:]
}
keccakF1600(&c.a)
copyOut(c, out[:len(out)])
}
// New224 creates a new SHA3-224 hash.
// Its generic security strength is 224 bits against preimage attacks,
// and 112 bits against collision attacks.