LumeWeb
/
blake3
Archived
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

only pad block when necessary

This commit is contained in:
lukechampine 2020-01-11 20:58:07 -05:00
parent 6ff1174970
commit 633f7e15c1
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
blake3.go
View File

@ -244,9 +244,6 @@ func (cs *chunkState) update(input []byte) {
cs.n.cv = cs.n.chainingValue() cs.n.cv = cs.n.chainingValue()
// clear the start flag for all but the first block // clear the start flag for all but the first block
cs.n.flags &^= flagChunkStart cs.n.flags &^= flagChunkStart
// reset the chunk block. It must contain zeros, because BLAKE3
// blocks are zero-padded.
cs.block = [blockSize]byte{}
cs.blockLen = 0 cs.blockLen = 0
} }
@ -258,10 +255,19 @@ func (cs *chunkState) update(input []byte) {
} }
} }
// compiles to memclr
func clear(b []byte) {
for i := range b {
b[i] = 0
}
}
// node returns a node containing the chunkState's current state, with the // node returns a node containing the chunkState's current state, with the
// ChunkEnd flag set. // ChunkEnd flag set.
func (cs *chunkState) node() node { func (cs *chunkState) node() node {
n := cs.n n := cs.n
// pad the remaining space in the block with zeros
clear(cs.block[cs.blockLen:])
bytesToWords(cs.block[:], n.block[:]) bytesToWords(cs.block[:], n.block[:])
n.blockLen = uint32(cs.blockLen) n.blockLen = uint32(cs.blockLen)
n.flags |= flagChunkEnd n.flags |= flagChunkEnd