From afe18e86a7aa2248c69997ed941bcbe3e6b2a655 Mon Sep 17 00:00:00 2001
From: Stefan Majewsky <majewsky@gmx.net>
Date: Tue, 29 Oct 2019 16:51:07 +0100
Subject: switch to go.mod

---
 .../chacha20poly1305/chacha20poly1305_amd64.go     | 127 ---------------------
 1 file changed, 127 deletions(-)
 delete mode 100644 vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.go

(limited to 'vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.go')

diff --git a/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.go b/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.go
deleted file mode 100644
index 1e523b9..0000000
--- a/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.go
+++ /dev/null
@@ -1,127 +0,0 @@
-// Copyright 2016 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 go1.7,amd64,!gccgo,!appengine
-
-package chacha20poly1305
-
-import "encoding/binary"
-
-//go:noescape
-func chacha20Poly1305Open(dst []byte, key []uint32, src, ad []byte) bool
-
-//go:noescape
-func chacha20Poly1305Seal(dst []byte, key []uint32, src, ad []byte)
-
-// cpuid is implemented in chacha20poly1305_amd64.s.
-func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
-
-// xgetbv with ecx = 0 is implemented in chacha20poly1305_amd64.s.
-func xgetbv() (eax, edx uint32)
-
-var (
-	useASM  bool
-	useAVX2 bool
-)
-
-func init() {
-	detectCpuFeatures()
-}
-
-// detectCpuFeatures is used to detect if cpu instructions
-// used by the functions implemented in assembler in
-// chacha20poly1305_amd64.s are supported.
-func detectCpuFeatures() {
-	maxId, _, _, _ := cpuid(0, 0)
-	if maxId < 1 {
-		return
-	}
-
-	_, _, ecx1, _ := cpuid(1, 0)
-
-	haveSSSE3 := isSet(9, ecx1)
-	useASM = haveSSSE3
-
-	haveOSXSAVE := isSet(27, ecx1)
-
-	osSupportsAVX := false
-	// For XGETBV, OSXSAVE bit is required and sufficient.
-	if haveOSXSAVE {
-		eax, _ := xgetbv()
-		// Check if XMM and YMM registers have OS support.
-		osSupportsAVX = isSet(1, eax) && isSet(2, eax)
-	}
-	haveAVX := isSet(28, ecx1) && osSupportsAVX
-
-	if maxId < 7 {
-		return
-	}
-
-	_, ebx7, _, _ := cpuid(7, 0)
-	haveAVX2 := isSet(5, ebx7) && haveAVX
-	haveBMI2 := isSet(8, ebx7)
-
-	useAVX2 = haveAVX2 && haveBMI2
-}
-
-// isSet checks if bit at bitpos is set in value.
-func isSet(bitpos uint, value uint32) bool {
-	return value&(1<<bitpos) != 0
-}
-
-// setupState writes a ChaCha20 input matrix to state. See
-// https://tools.ietf.org/html/rfc7539#section-2.3.
-func setupState(state *[16]uint32, key *[32]byte, nonce []byte) {
-	state[0] = 0x61707865
-	state[1] = 0x3320646e
-	state[2] = 0x79622d32
-	state[3] = 0x6b206574
-
-	state[4] = binary.LittleEndian.Uint32(key[:4])
-	state[5] = binary.LittleEndian.Uint32(key[4:8])
-	state[6] = binary.LittleEndian.Uint32(key[8:12])
-	state[7] = binary.LittleEndian.Uint32(key[12:16])
-	state[8] = binary.LittleEndian.Uint32(key[16:20])
-	state[9] = binary.LittleEndian.Uint32(key[20:24])
-	state[10] = binary.LittleEndian.Uint32(key[24:28])
-	state[11] = binary.LittleEndian.Uint32(key[28:32])
-
-	state[12] = 0
-	state[13] = binary.LittleEndian.Uint32(nonce[:4])
-	state[14] = binary.LittleEndian.Uint32(nonce[4:8])
-	state[15] = binary.LittleEndian.Uint32(nonce[8:12])
-}
-
-func (c *chacha20poly1305) seal(dst, nonce, plaintext, additionalData []byte) []byte {
-	if !useASM {
-		return c.sealGeneric(dst, nonce, plaintext, additionalData)
-	}
-
-	var state [16]uint32
-	setupState(&state, &c.key, nonce)
-
-	ret, out := sliceForAppend(dst, len(plaintext)+16)
-	chacha20Poly1305Seal(out[:], state[:], plaintext, additionalData)
-	return ret
-}
-
-func (c *chacha20poly1305) open(dst, nonce, ciphertext, additionalData []byte) ([]byte, error) {
-	if !useASM {
-		return c.openGeneric(dst, nonce, ciphertext, additionalData)
-	}
-
-	var state [16]uint32
-	setupState(&state, &c.key, nonce)
-
-	ciphertext = ciphertext[:len(ciphertext)-16]
-	ret, out := sliceForAppend(dst, len(ciphertext))
-	if !chacha20Poly1305Open(out, state[:], ciphertext, additionalData) {
-		for i := range out {
-			out[i] = 0
-		}
-		return nil, errOpen
-	}
-
-	return ret, nil
-}
-- 
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