implementation of Go.  This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation.  If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this

implementation of Go.  This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation.  If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this

implementation of Go.  This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation.  If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this

// calls that would have gone to updateGeneric to updateVX if the vector
// facility is installed.
//
// A larger buffer is required for good performance because the vector
// implementation has a higher fixed cost per call than the generic
// implementation.
type mac struct {
	macState

	buffer [16 * TagSize]byte // size must be a multiple of block size (16)
	offset int
}

func (h *mac) Write(p []byte) (int, error) {

}

// new224 returns an assembly implementation of SHA3-224 if available,
// otherwise it returns a generic implementation.
func new224() hash.Hash {
	if cpu.S390X.HasSHA3 {
		return newAsmState(sha3_224)
	}
	return new224Generic()
}

// new256 returns an assembly implementation of SHA3-256 if available,
// otherwise it returns a generic implementation.
func new256() hash.Hash {
	if cpu.S390X.HasSHA3 {

	HasEVTSTRM  bool // Event stream support
	HasAES      bool // AES hardware implementation
	HasPMULL    bool // Polynomial multiplication instruction set
	HasSHA1     bool // SHA1 hardware implementation
	HasSHA2     bool // SHA2 hardware implementation
	HasCRC32    bool // CRC32 hardware implementation
	HasATOMICS  bool // Atomic memory operation instruction set

//go:build gc && !purego

package chacha20

import "golang.org/x/sys/cpu"

var haveAsm = cpu.S390X.HasVX

const bufSize = 256

// xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
// be called when the vector facility is available. Implementation in asm_s390x.s.
//
//go:noescape
func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)

func init() {
	userImplemented = false
	groupImplemented = false
	groupListImplemented = false
}

var (
	// unused variables (in this implementation)
	// modified during test to exercise code paths in the cgo implementation.
	userBuffer  = 0
	groupBuffer = 0
)

func current() (*User, error) {
	ubytes, err := os.ReadFile("/dev/user")
	if err != nil {
		return nil, fmt.Errorf("user: %s", err)

type aesCipherAsm struct {
	aesCipher
}

// aesCipherGCM implements crypto/cipher.gcmAble so that crypto/cipher.NewGCM
// will use the optimised implementation in aes_gcm.go when possible.
// Instances of this type only exist when hasGCMAsm returns true. Likewise,
// the gcmAble implementation is in aes_gcm.go.
type aesCipherGCM struct {
	aesCipherAsm
}

package user

import (
	"fmt"
	"os"
	"runtime"
	"strconv"
)

var (
	// unused variables (in this implementation)
	// modified during test to exercise code paths in the cgo implementation.
	userBuffer  = 0
	groupBuffer = 0
)

func current() (*User, error) {
	uid := currentUID()
	// $USER and /etc/passwd may disagree; prefer the latter if we can get it.