FreeBSD 12 support (NOTE: xc not yet functional)

Signed-off-by: Russ Magee <rmagee@gmail.com>

vendor/gopkg.in/hlandau/passlib.v1/hash/pbkdf2/raw/parse.go

@@ -1,62 +0,0 @@
-package raw
-
-import (
-	"crypto/sha1"
-	"crypto/sha256"
-	"crypto/sha512"
-	"fmt"
-	"hash"
-	"strconv"
-	"strings"
-)
-
-// Indicates that a password hash or stub is invalid.
-var ErrInvalidStub = fmt.Errorf("invalid stub")
-
-// Indicates that the number of rounds specified is not in the valid range.
-var ErrInvalidRounds = fmt.Errorf("invalid number of rounds")
-
-var hashMap = map[string]func() hash.Hash{
-	"pbkdf2":        sha1.New,
-	"pbkdf2-sha256": sha256.New,
-	"pbkdf2-sha512": sha512.New,
-}
-
-func Parse(stub string) (hashFunc func() hash.Hash, rounds int, salt []byte, hash string, err error) {
-	// does not start with $pbkdf2
-	if !strings.HasPrefix(stub, "$pbkdf2") {
-		err = ErrInvalidStub
-		return
-	}
-
-	parts := strings.Split(stub, "$")
-	if f, ok := hashMap[parts[1]]; ok {
-		hashFunc = f
-	} else {
-		err = ErrInvalidStub
-		return
-	}
-
-	roundsStr := parts[2]
-	var n uint64
-	n, err = strconv.ParseUint(roundsStr, 10, 31)
-	if err != nil {
-		err = ErrInvalidStub
-		return
-	}
-	rounds = int(n)
-
-	if rounds < MinRounds || rounds > MaxRounds {
-		err = ErrInvalidRounds
-		return
-	}
-
-	salt, err = Base64Decode(parts[3])
-	if err != nil {
-		err = fmt.Errorf("could not decode base64 salt")
-		return
-	}
-	hash = parts[4]
-
-	return
-}