1 files changed, 53 insertions, 0 deletions

diff --git a/vendor/golang.org/x/crypto/argon2/blake2b.go b/vendor/golang.org/x/crypto/argon2/blake2b.go
new file mode 100644
index 0000000..10f4694
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/blake2b.go
@@ -0,0 +1,53 @@
+// 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])
+}