MAGIC - add license

cipher/ccm.go

@@ -127,8 +127,8 @@ func (c *ccm) auth(nonce, plaintext, additionalData []byte, tagMask *[ccmBlockSi
 	if len(additionalData) > 0 {
 		out[0] = 1 << 6 // 64*Adata
 	}
-	out[0] |= byte(c.tagSize-2) << 2
-	out[0] |= byte(14 - c.nonceSize)
+	out[0] |= byte(c.tagSize-2) << 2 // M' = ((tagSize - 2) / 2)*8
+	out[0] |= byte(14 - c.nonceSize) // L'
 	binary.BigEndian.PutUint64(out[ccmBlockSize-8:], uint64(len(plaintext)))
 	copy(out[1:], nonce)
 	c.cipher.Encrypt(out[:], out[:])

cipher/ccm_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 )
 
+// https://tools.ietf.org/html/rfc3610, 8. Test Vectors
 var aesCCMTests = []struct {
 	key, nonce, plaintext, ad, result string
 	tagSize                           int

cipher/xor_amd64.go

@@ -1,3 +1,7 @@
+// Copyright 2018 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 cipher
 
 // XorBytes xors the bytes in a and b. The destination should have enough

cipher/xor_amd64.s

@@ -1,3 +1,7 @@
+// Copyright 2018 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.
+
 #include "textflag.h"
 
 // func xorBytesSSE2(dst, a, b *byte, n int)

cipher/xor_generic.go

@@ -1,3 +1,7 @@
+// Copyright 2013 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.
+
 // +build !amd64
 
 package cipher