我需要使用Keccak-256算法（NOT SHA3）创建哈希。
我正在运行PHP 7.1，当我调用hash_algos()时，我返回了注册的算法，但 Keccak-256 不存在。
支持的算法有：
[0] => md2
[1] => md4
[2] => md5
[3] => sha1
[4] => sha224
[5] => sha256
[6] => sha384
[7] => sha512/224
[8] => sha512/256
[9] => sha512
[10] => sha3-224
[11] => sha3-256
[12] => sha3-384
[13] => sha3-512
[14] => ripemd128
[15] => ripemd160
[16] => ripemd256
[17] => ripemd320
[18] => whirlpool
[19] => tiger128,3
[20] => tiger160,3
[21] => tiger192,3
[22] => tiger128,4
[23] => tiger160,4
[24] => tiger192,4
[25] => snefru
[26] => snefru256
[27] => gost
[28] => gost-crypto
[29] => adler32
[30] => crc32
[31] => crc32b
[32] => fnv132
[33] => fnv1a32
[34] => fnv164
[35] => fnv1a64
[36] => joaat
[37] => haval128,3
[38] => haval160,3
[39] => haval192,3
[40] => haval224,3
[41] => haval256,3
[42] => haval128,4
[43] => haval160,4
[44] => haval192,4
[45] => haval224,4
[46] => haval256,4
[47] => haval128,5
[48] => haval160,5
[49] => haval192,5
[50] => haval224,5
[51] => haval256,5
我在谷歌、GITHUB 中搜索过，但没有找到任何东西，感谢您的帮助。