forked from gitea/gitea
54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package argon2
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"hash"
|
|
|
|
"golang.org/x/crypto/blake2b"
|
|
)
|
|
|
|
// blake2bHash computes an arbitrary long hash value of in
|
|
// and writes the hash to out.
|
|
func blake2bHash(out []byte, in []byte) {
|
|
var b2 hash.Hash
|
|
if n := len(out); n < blake2b.Size {
|
|
b2, _ = blake2b.New(n, nil)
|
|
} else {
|
|
b2, _ = blake2b.New512(nil)
|
|
}
|
|
|
|
var buffer [blake2b.Size]byte
|
|
binary.LittleEndian.PutUint32(buffer[:4], uint32(len(out)))
|
|
b2.Write(buffer[:4])
|
|
b2.Write(in)
|
|
|
|
if len(out) <= blake2b.Size {
|
|
b2.Sum(out[:0])
|
|
return
|
|
}
|
|
|
|
outLen := len(out)
|
|
b2.Sum(buffer[:0])
|
|
b2.Reset()
|
|
copy(out, buffer[:32])
|
|
out = out[32:]
|
|
for len(out) > blake2b.Size {
|
|
b2.Write(buffer[:])
|
|
b2.Sum(buffer[:0])
|
|
copy(out, buffer[:32])
|
|
out = out[32:]
|
|
b2.Reset()
|
|
}
|
|
|
|
if outLen%blake2b.Size > 0 { // outLen > 64
|
|
r := ((outLen + 31) / 32) - 2 // ⌈τ /32⌉-2
|
|
b2, _ = blake2b.New(outLen-32*r, nil)
|
|
}
|
|
b2.Write(buffer[:])
|
|
b2.Sum(out[:0])
|
|
}
|