diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/salsa20/salsa20.go')
-rw-r--r-- | vendor/golang.org/x/crypto/salsa20/salsa20.go | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa20.go b/vendor/golang.org/x/crypto/salsa20/salsa20.go deleted file mode 100644 index 0ee62485a..000000000 --- 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 must overlap entirely or not at all. 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) -} |