Delete vendored code and update CI to Go 1.13 (#158)

As the Go community transitions to using the modules ecosystem,
we want to only support one way of managing dependencies.
So this change moves to only using Go modules for dependency management.

This means that our effective minimum Go version increases to Go 1.11.
To account for this, we also update:
  - the documentation
  - Makefile
  - CI scripts

1 files changed, 0 insertions, 289 deletions

diff --git a/vendor/golang.org/x/crypto/blake2b/blake2b.go b/vendor/golang.org/x/crypto/blake2b/blake2b.go
deleted file mode 100644
index 58ea875..0000000
--- a/vendor/golang.org/x/crypto/blake2b/blake2b.go
+++ /dev/null
@@ -1,289 +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.
-
-// Package blake2b implements the BLAKE2b hash algorithm defined by RFC 7693
-// and the extendable output function (XOF) BLAKE2Xb.
-//
-// For a detailed specification of BLAKE2b see https://blake2.net/blake2.pdf
-// and for BLAKE2Xb see https://blake2.net/blake2x.pdf
-//
-// If you aren't sure which function you need, use BLAKE2b (Sum512 or New512).
-// If you need a secret-key MAC (message authentication code), use the New512
-// function with a non-nil key.
-//
-// BLAKE2X is a construction to compute hash values larger than 64 bytes. It
-// can produce hash values between 0 and 4 GiB.
-package blake2b
-
-import (
-	"encoding/binary"
-	"errors"
-	"hash"
-)
-
-const (
-	// The blocksize of BLAKE2b in bytes.
-	BlockSize = 128
-	// The hash size of BLAKE2b-512 in bytes.
-	Size = 64
-	// The hash size of BLAKE2b-384 in bytes.
-	Size384 = 48
-	// The hash size of BLAKE2b-256 in bytes.
-	Size256 = 32
-)
-
-var (
-	useAVX2 bool
-	useAVX  bool
-	useSSE4 bool
-)
-
-var (
-	errKeySize  = errors.New("blake2b: invalid key size")
-	errHashSize = errors.New("blake2b: invalid hash size")
-)
-
-var iv = [8]uint64{
-	0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
-	0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179,
-}
-
-// Sum512 returns the BLAKE2b-512 checksum of the data.
-func Sum512(data []byte) [Size]byte {
-	var sum [Size]byte
-	checkSum(&sum, Size, data)
-	return sum
-}
-
-// Sum384 returns the BLAKE2b-384 checksum of the data.
-func Sum384(data []byte) [Size384]byte {
-	var sum [Size]byte
-	var sum384 [Size384]byte
-	checkSum(&sum, Size384, data)
-	copy(sum384[:], sum[:Size384])
-	return sum384
-}
-
-// Sum256 returns the BLAKE2b-256 checksum of the data.
-func Sum256(data []byte) [Size256]byte {
-	var sum [Size]byte
-	var sum256 [Size256]byte
-	checkSum(&sum, Size256, data)
-	copy(sum256[:], sum[:Size256])
-	return sum256
-}
-
-// New512 returns a new hash.Hash computing the BLAKE2b-512 checksum. A non-nil
-// key turns the hash into a MAC. The key must between zero and 64 bytes long.
-func New512(key []byte) (hash.Hash, error) { return newDigest(Size, key) }
-
-// New384 returns a new hash.Hash computing the BLAKE2b-384 checksum. A non-nil
-// key turns the hash into a MAC. The key must between zero and 64 bytes long.
-func New384(key []byte) (hash.Hash, error) { return newDigest(Size384, key) }
-
-// New256 returns a new hash.Hash computing the BLAKE2b-256 checksum. A non-nil
-// key turns the hash into a MAC. The key must between zero and 64 bytes long.
-func New256(key []byte) (hash.Hash, error) { return newDigest(Size256, key) }
-
-// New returns a new hash.Hash computing the BLAKE2b checksum with a custom length.
-// A non-nil key turns the hash into a MAC. The key must between zero and 64 bytes long.
-// The hash size can be a value between 1 and 64 but it is highly recommended to use
-// values equal or greater than:
-// - 32 if BLAKE2b is used as a hash function (The key is zero bytes long).
-// - 16 if BLAKE2b is used as a MAC function (The key is at least 16 bytes long).
-// When the key is nil, the returned hash.Hash implements BinaryMarshaler
-// and BinaryUnmarshaler for state (de)serialization as documented by hash.Hash.
-func New(size int, key []byte) (hash.Hash, error) { return newDigest(size, key) }
-
-func newDigest(hashSize int, key []byte) (*digest, error) {
-	if hashSize < 1 || hashSize > Size {
-		return nil, errHashSize
-	}
-	if len(key) > Size {
-		return nil, errKeySize
-	}
-	d := &digest{
-		size:   hashSize,
-		keyLen: len(key),
-	}
-	copy(d.key[:], key)
-	d.Reset()
-	return d, nil
-}
-
-func checkSum(sum *[Size]byte, hashSize int, data []byte) {
-	h := iv
-	h[0] ^= uint64(hashSize) | (1 << 16) | (1 << 24)
-	var c [2]uint64
-
-	if length := len(data); length > BlockSize {
-		n := length &^ (BlockSize - 1)
-		if length == n {
-			n -= BlockSize
-		}
-		hashBlocks(&h, &c, 0, data[:n])
-		data = data[n:]
-	}
-
-	var block [BlockSize]byte
-	offset := copy(block[:], data)
-	remaining := uint64(BlockSize - offset)
-	if c[0] < remaining {
-		c[1]--
-	}
-	c[0] -= remaining
-
-	hashBlocks(&h, &c, 0xFFFFFFFFFFFFFFFF, block[:])
-
-	for i, v := range h[:(hashSize+7)/8] {
-		binary.LittleEndian.PutUint64(sum[8*i:], v)
-	}
-}
-
-type digest struct {
-	h      [8]uint64
-	c      [2]uint64
-	size   int
-	block  [BlockSize]byte
-	offset int
-
-	key    [BlockSize]byte
-	keyLen int
-}
-
-const (
-	magic         = "b2b"
-	marshaledSize = len(magic) + 8*8 + 2*8 + 1 + BlockSize + 1
-)
-
-func (d *digest) MarshalBinary() ([]byte, error) {
-	if d.keyLen != 0 {
-		return nil, errors.New("crypto/blake2b: cannot marshal MACs")
-	}
-	b := make([]byte, 0, marshaledSize)
-	b = append(b, magic...)
-	for i := 0; i < 8; i++ {
-		b = appendUint64(b, d.h[i])
-	}
-	b = appendUint64(b, d.c[0])
-	b = appendUint64(b, d.c[1])
-	// Maximum value for size is 64
-	b = append(b, byte(d.size))
-	b = append(b, d.block[:]...)
-	b = append(b, byte(d.offset))
-	return b, nil
-}
-
-func (d *digest) UnmarshalBinary(b []byte) error {
-	if len(b) < len(magic) || string(b[:len(magic)]) != magic {
-		return errors.New("crypto/blake2b: invalid hash state identifier")
-	}
-	if len(b) != marshaledSize {
-		return errors.New("crypto/blake2b: invalid hash state size")
-	}
-	b = b[len(magic):]
-	for i := 0; i < 8; i++ {
-		b, d.h[i] = consumeUint64(b)
-	}
-	b, d.c[0] = consumeUint64(b)
-	b, d.c[1] = consumeUint64(b)
-	d.size = int(b[0])
-	b = b[1:]
-	copy(d.block[:], b[:BlockSize])
-	b = b[BlockSize:]
-	d.offset = int(b[0])
-	return nil
-}
-
-func (d *digest) BlockSize() int { return BlockSize }
-
-func (d *digest) Size() int { return d.size }
-
-func (d *digest) Reset() {
-	d.h = iv
-	d.h[0] ^= uint64(d.size) | (uint64(d.keyLen) << 8) | (1 << 16) | (1 << 24)
-	d.offset, d.c[0], d.c[1] = 0, 0, 0
-	if d.keyLen > 0 {
-		d.block = d.key
-		d.offset = BlockSize
-	}
-}
-
-func (d *digest) Write(p []byte) (n int, err error) {
-	n = len(p)
-
-	if d.offset > 0 {
-		remaining := BlockSize - d.offset
-		if n <= remaining {
-			d.offset += copy(d.block[d.offset:], p)
-			return
-		}
-		copy(d.block[d.offset:], p[:remaining])
-		hashBlocks(&d.h, &d.c, 0, d.block[:])
-		d.offset = 0
-		p = p[remaining:]
-	}
-
-	if length := len(p); length > BlockSize {
-		nn := length &^ (BlockSize - 1)
-		if length == nn {
-			nn -= BlockSize
-		}
-		hashBlocks(&d.h, &d.c, 0, p[:nn])
-		p = p[nn:]
-	}
-
-	if len(p) > 0 {
-		d.offset += copy(d.block[:], p)
-	}
-
-	return
-}
-
-func (d *digest) Sum(sum []byte) []byte {
-	var hash [Size]byte
-	d.finalize(&hash)
-	return append(sum, hash[:d.size]...)
-}
-
-func (d *digest) finalize(hash *[Size]byte) {
-	var block [BlockSize]byte
-	copy(block[:], d.block[:d.offset])
-	remaining := uint64(BlockSize - d.offset)
-
-	c := d.c
-	if c[0] < remaining {
-		c[1]--
-	}
-	c[0] -= remaining
-
-	h := d.h
-	hashBlocks(&h, &c, 0xFFFFFFFFFFFFFFFF, block[:])
-
-	for i, v := range h {
-		binary.LittleEndian.PutUint64(hash[8*i:], v)
-	}
-}
-
-func appendUint64(b []byte, x uint64) []byte {
-	var a [8]byte
-	binary.BigEndian.PutUint64(a[:], x)
-	return append(b, a[:]...)
-}
-
-func appendUint32(b []byte, x uint32) []byte {
-	var a [4]byte
-	binary.BigEndian.PutUint32(a[:], x)
-	return append(b, a[:]...)
-}
-
-func consumeUint64(b []byte) ([]byte, uint64) {
-	x := binary.BigEndian.Uint64(b)
-	return b[8:], x
-}
-
-func consumeUint32(b []byte) ([]byte, uint32) {
-	x := binary.BigEndian.Uint32(b)
-	return b[4:], x
-}