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author | Harrison Healey <harrisonmhealey@gmail.com> | 2018-01-16 12:03:31 -0500 |
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committer | GitHub <noreply@github.com> | 2018-01-16 12:03:31 -0500 |
commit | 2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7 (patch) | |
tree | e08ff912e1924c06939f314168c3362d6f1ec0de /vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/poly1305/poly1305.go | |
parent | f5c8a71698d0a7a16c68be220e49fe64bfee7f5c (diff) | |
download | chat-2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7.tar.gz chat-2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7.tar.bz2 chat-2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7.zip |
Updated dependencies and added avct/uasurfer (#8089)
* Updated dependencies and added avct/uasurfer
* Added uasurfer to NOTICE.txt
Diffstat (limited to 'vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/poly1305/poly1305.go')
-rw-r--r-- | vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/poly1305/poly1305.go | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/poly1305/poly1305.go b/vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/poly1305/poly1305.go new file mode 100644 index 000000000..f562fa571 --- /dev/null +++ b/vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/poly1305/poly1305.go @@ -0,0 +1,33 @@ +// 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 poly1305 implements Poly1305 one-time message authentication code as +specified in https://cr.yp.to/mac/poly1305-20050329.pdf. + +Poly1305 is a fast, one-time authentication function. It is infeasible for an +attacker to generate an authenticator for a message without the key. However, a +key must only be used for a single message. Authenticating two different +messages with the same key allows an attacker to forge authenticators for other +messages with the same key. + +Poly1305 was originally coupled with AES in order to make Poly1305-AES. AES was +used with a fixed key in order to generate one-time keys from an nonce. +However, in this package AES isn't used and the one-time key is specified +directly. +*/ +package poly1305 // import "golang.org/x/crypto/poly1305" + +import "crypto/subtle" + +// TagSize is the size, in bytes, of a poly1305 authenticator. +const TagSize = 16 + +// Verify returns true if mac is a valid authenticator for m with the given +// key. +func Verify(mac *[16]byte, m []byte, key *[32]byte) bool { + var tmp [16]byte + Sum(&tmp, m, key) + return subtle.ConstantTimeCompare(tmp[:], mac[:]) == 1 +} |