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[bytom/vapor.git] / vendor / golang.org / x / crypto / salsa20 / salsa20.go

diff --git a/vendor/golang.org/x/crypto/salsa20/salsa20.go b/vendor/golang.org/x/crypto/salsa20/salsa20.go
deleted file mode 100644 (file)
index a8ddd76..0000000
--- a/vendor/golang.org/x/crypto/salsa20/salsa20.go
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright 2012 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 salsa20 implements the Salsa20 stream cipher as specified in https://cr.yp.to/snuffle/spec.pdf.
-
-Salsa20 differs from many other stream ciphers in that it is message orientated
-rather than byte orientated. Keystream blocks are not preserved between calls,
-therefore each side must encrypt/decrypt data with the same segmentation.
-
-Another aspect of this difference is that part of the counter is exposed as
-a nonce in each call. Encrypting two different messages with the same (key,
-nonce) pair leads to trivial plaintext recovery. This is analogous to
-encrypting two different messages with the same key with a traditional stream
-cipher.
-
-This package also implements XSalsa20: a version of Salsa20 with a 24-byte
-nonce as specified in https://cr.yp.to/snuffle/xsalsa-20081128.pdf. Simply
-passing a 24-byte slice as the nonce triggers XSalsa20.
-*/
-package salsa20 // import "golang.org/x/crypto/salsa20"
-
-// TODO(agl): implement XORKeyStream12 and XORKeyStream8 - the reduced round variants of Salsa20.
-
-import (
-       "golang.org/x/crypto/salsa20/salsa"
-)
-
-// XORKeyStream crypts bytes from in to out using the given key and nonce. In
-// and out may be the same slice but otherwise should not overlap. Nonce must
-// be either 8 or 24 bytes long.
-func XORKeyStream(out, in []byte, nonce []byte, key *[32]byte) {
-       if len(out) < len(in) {
-               in = in[:len(out)]
-       }
-
-       var subNonce [16]byte
-
-       if len(nonce) == 24 {
-               var subKey [32]byte
-               var hNonce [16]byte
-               copy(hNonce[:], nonce[:16])
-               salsa.HSalsa20(&subKey, &hNonce, key, &salsa.Sigma)
-               copy(subNonce[:], nonce[16:])
-               key = &subKey
-       } else if len(nonce) == 8 {
-               copy(subNonce[:], nonce[:])
-       } else {
-               panic("salsa20: nonce must be 8 or 24 bytes")
-       }
-
-       salsa.XORKeyStream(out, in, &subNonce, key)
-}