d.h[1] = init1
	d.h[2] = init2
	d.h[3] = init3
	d.h[4] = init4
	d.nx = 0
	d.len = 0
}

// New returns a new hash.Hash computing the SHA1 checksum. The Hash also
// implements [encoding.BinaryMarshaler] and [encoding.BinaryUnmarshaler] to
// marshal and unmarshal the internal state of the hash.
func New() hash.Hash {
	if boring.Enabled {
		return boring.NewSHA1()
	}
	d := new(digest)
	d.Reset()

	{"crypto.Decrypter", "type Decrypter interface{Decrypt(rand io.Reader, msg []byte, opts DecrypterOpts) (plaintext []byte, err error); Public() PublicKey}"},
	{"encoding.BinaryMarshaler", "type BinaryMarshaler interface{MarshalBinary() (data []byte, err error)}"},
	{"io.Reader", "type Reader interface{Read(p []byte) (n int, err error)}"},
	{"io.ReadWriter", "type ReadWriter interface{Reader; Writer}"},

		d.h[5] = init5_224
		d.h[6] = init6_224
		d.h[7] = init7_224
	}
	d.nx = 0
	d.len = 0
}

// New returns a new hash.Hash computing the SHA256 checksum. The Hash
// also implements [encoding.BinaryMarshaler] and
// [encoding.BinaryUnmarshaler] to marshal and unmarshal the internal
// state of the hash.
func New() hash.Hash {
	if boring.Enabled {
		return boring.NewSHA256()
	}
	d := new(digest)
	d.Reset()

		if !ok {
			return errInvalidOID
		}
		der = appendBase128BigInt(der, b)
	}

	o.der = der
	return nil
}

// MarshalBinary implements [encoding.BinaryMarshaler]
func (o OID) MarshalBinary() ([]byte, error) {
	return bytes.Clone(o.der), nil
}

// UnmarshalBinary implements [encoding.BinaryUnmarshaler]
func (o *OID) UnmarshalBinary(b []byte) error {

	}

	for _, tt := range cases {
		if eq := tt.oid.Equal(tt.oid2); eq != tt.eq {
			t.Errorf("(%v).Equal(%v) = %v, want %v", tt.oid, tt.oid2, eq, tt.eq)
		}
	}
}

var (
	_ encoding.BinaryMarshaler   = OID{}
	_ encoding.BinaryUnmarshaler = new(OID)
	_ encoding.TextMarshaler     = OID{}
	_ encoding.TextUnmarshaler   = new(OID)
)

func TestOIDMarshal(t *testing.T) {
	cases := []struct {

// Package sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256
// hash algorithms as defined in FIPS 180-4.
//
// All the hash.Hash implementations returned by this package also
// implement encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to
// marshal and unmarshal the internal state of the hash.
package sha512

import (
	"crypto"
	"crypto/internal/boring"
	"errors"
	"hash"
	"internal/byteorder"
)

	decIndir    int8         // number of indirections to reach the receiver type; may be negative
}

// externalEncoding bits
const (
	xGob    = 1 + iota // GobEncoder or GobDecoder
	xBinary            // encoding.BinaryMarshaler or encoding.BinaryUnmarshaler
	xText              // encoding.TextMarshaler or encoding.TextUnmarshaler
)

var userTypeCache sync.Map // map[reflect.Type]*userTypeInfo

		byteorder.BePutUint64(b[:8], ip.addr.hi)
		byteorder.BePutUint64(b[8:], ip.addr.lo)
		copy(b[16:], z)
	}
	return b
}

// MarshalBinary implements the [encoding.BinaryMarshaler] interface.
// It returns a zero-length slice for the zero [Addr],
// the 4-byte form for an IPv4 address,
// and the 16-byte form with zone appended for an IPv6 address.

	var data []byte
	var err error
	// We know it's one of these.
	switch ut.externalEnc {
	case xGob:
		data, err = v.Interface().(GobEncoder).GobEncode()
	case xBinary:
		data, err = v.Interface().(encoding.BinaryMarshaler).MarshalBinary()
	case xText:
		data, err = v.Interface().(encoding.TextMarshaler).MarshalText()
	}
	if err != nil {
		error_(err)
	}
	state := enc.newEncoderState(b)
	state.fieldnum = -1

at the top level will fail. A struct field of chan or func type is treated exactly
like an unexported field and is ignored.

Gob can encode a value of any type implementing the [GobEncoder] or
[encoding.BinaryMarshaler] interfaces by calling the corresponding method,
in that order of preference.

Gob can decode a value of any type implementing the [GobDecoder] or
[encoding.BinaryUnmarshaler] interfaces by calling the corresponding method,