github.com/icodeface/tls@v0.0.0-20230910023335-34df9250cd12/internal/x/crypto/poly1305/sum_amd64.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build amd64,!gccgo,!appengine
     6  
     7  package poly1305
     8  
     9  // This function is implemented in sum_amd64.s
    10  //go:noescape
    11  func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
    12  
    13  // Sum generates an authenticator for m using a one-time key and puts the
    14  // 16-byte result into out. Authenticating two different messages with the same
    15  // key allows an attacker to forge messages at will.
    16  func Sum(out *[16]byte, m []byte, key *[32]byte) {
    17  	var mPtr *byte
    18  	if len(m) > 0 {
    19  		mPtr = &m[0]
    20  	}
    21  	poly1305(out, mPtr, uint64(len(m)), key)
    22  }