// license that can be found in the LICENSE file.

// Package sha256 implements the SHA224 and SHA256 hash algorithms as defined
// in FIPS 180-4.
package sha256

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

func init() {
	crypto.RegisterHash(crypto.SHA224, New224)
	crypto.RegisterHash(crypto.SHA256, New)
}

// The size of a SHA256 checksum in bytes.

func (h Hash) HashFunc() Hash {
	return h
}

func (h Hash) String() string {
	switch h {
	case MD4:
		return "MD4"
	case MD5:
		return "MD5"
	case SHA1:
		return "SHA-1"
	case SHA224:
		return "SHA-224"
	case SHA256:
		return "SHA-256"
	case SHA384:
		return "SHA-384"
	case SHA512:
		return "SHA-512"
	case MD5SHA1:
		return "MD5+SHA1"
	case RIPEMD160:
		return "RIPEMD-160"

	{"sha1", sha1.New, fromHex("736861016dad5acb4dc003952f7a0b352ee5537ec381a228c0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f80000000000000000000000000000f9")},

func NewSHA384() hash.Hash { panic("boringcrypto: not available") }
func NewSHA512() hash.Hash { panic("boringcrypto: not available") }

func SHA1([]byte) [20]byte   { panic("boringcrypto: not available") }
func SHA224([]byte) [28]byte { panic("boringcrypto: not available") }
func SHA256([]byte) [32]byte { panic("boringcrypto: not available") }
func SHA384([]byte) [48]byte { panic("boringcrypto: not available") }

	switch ch {
	case crypto.MD5:
		return C._goboringcrypto_EVP_md5()
	case crypto.MD5SHA1:
		return C._goboringcrypto_EVP_md5_sha1()
	case crypto.SHA1:
		return C._goboringcrypto_EVP_sha1()
	case crypto.SHA224:
		return C._goboringcrypto_EVP_sha224()
	case crypto.SHA256:
		return C._goboringcrypto_EVP_sha256()
	case crypto.SHA384:
		return C._goboringcrypto_EVP_sha384()
	case crypto.SHA512: