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"
	case SHA3_224:
		return "SHA3-224"
	case SHA3_256:
		return "SHA3-256"
	case SHA3_384:
		return "SHA3-384"
	case SHA3_512:

// concatenation of an MD5 and SHA1 hash.
func md5SHA1Hash(slices [][]byte) []byte {
	md5sha1 := make([]byte, md5.Size+sha1.Size)
	hmd5 := md5.New()
	for _, slice := range slices {
		hmd5.Write(slice)
	}
	copy(md5sha1, hmd5.Sum(nil))
	copy(md5sha1[md5.Size:], sha1Hash(slices))
	return md5sha1
}

// hashForServerKeyExchange hashes the given slices and returns their digest

}

// cryptoHashToMD converts a crypto.Hash
// to a BoringCrypto *C.GO_EVP_MD.
func cryptoHashToMD(ch crypto.Hash) *C.GO_EVP_MD {
	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:

// signature algorithm negotiation.
func legacyTypeAndHashFromPublicKey(pub crypto.PublicKey) (sigType uint8, hash crypto.Hash, err error) {
	switch pub.(type) {
	case *rsa.PublicKey:
		return signaturePKCS1v15, crypto.MD5SHA1, nil
	case *ecdsa.PublicKey:
		return signatureECDSA, crypto.SHA1, nil
	case ed25519.PublicKey:
		// RFC 8422 specifies support for Ed25519 in TLS 1.0 and 1.1,

	crypto.SHA512:    {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40},
	crypto.MD5SHA1:   {}, // A special TLS case which doesn't use an ASN1 prefix.
	crypto.RIPEMD160: {0x30, 0x20, 0x30, 0x08, 0x06, 0x06, 0x28, 0xcf, 0x06, 0x03, 0x00, 0x31, 0x04, 0x14},
}

		{"BLAKE2b_512", Const, 9},
		{"BLAKE2s_256", Const, 9},
		{"Decrypter", Type, 5},
		{"DecrypterOpts", Type, 5},
		{"Hash", Type, 0},
		{"MD4", Const, 0},
		{"MD5", Const, 0},
		{"MD5SHA1", Const, 0},
		{"PrivateKey", Type, 0},
		{"PublicKey", Type, 2},
		{"RIPEMD160", Const, 0},
		{"RegisterHash", Func, 0},
		{"SHA1", Const, 0},
		{"SHA224", Const, 0},
		{"SHA256", Const, 0},

pkg compress/zlib, const BestSpeed = 1
pkg compress/zlib, const DefaultCompression = -1
pkg compress/zlib, const NoCompression = 0
pkg crypto, const MD4 = 1
pkg crypto, const MD5 = 2
pkg crypto, const MD5SHA1 = 8
pkg crypto, const RIPEMD160 = 9
pkg crypto, const SHA1 = 3
pkg crypto, const SHA224 = 4
pkg crypto, const SHA256 = 5
pkg crypto, const SHA384 = 6
pkg crypto, const SHA512 = 7
pkg crypto/aes, const BlockSize = 16