type randReader int

func (randReader) Read(b []byte) (int, error) { panic("boringcrypto: not available") }

const RandReader = randReader(0)

func NewSHA1() hash.Hash   { panic("boringcrypto: not available") }
func NewSHA224() hash.Hash { panic("boringcrypto: not available") }
func NewSHA256() hash.Hash { panic("boringcrypto: not available") }
func NewSHA384() hash.Hash { panic("boringcrypto: not available") }

	}
	d := new(digest)
	d.Reset()
	return d
}

// New224 returns a new hash.Hash computing the SHA224 checksum.
func New224() hash.Hash {
	if boring.Enabled {
		return boring.NewSHA224()
	}
	d := new(digest)
	d.is224 = true
	d.Reset()
	return d
}

func (d *digest) Size() int {
	if !d.is224 {
		return Size
	}
	return Size224
}

	b, d.h[4] = consumeUint32(b)
	b = b[copy(d.x[:], b):]
	b, n := consumeUint64(b)
	d.nl = uint32(n << 3)
	d.nh = uint32(n >> 29)
	d.nx = uint32(n) % 64
	return nil
}

// NewSHA224 returns a new SHA224 hash.
func NewSHA224() hash.Hash {
	h := new(sha224Hash)
	h.Reset()
	return h
}

type sha224Hash struct {
	ctx C.GO_SHA256_CTX
	out [224 / 8]byte
}