hash_hkdf Generate a HKDF key derivation of a supplied key input
发表日期:2021-07-01 08:55:15 | 来源: | | 浏览(601) 分类:Hash 函数
hash_hkdf
(PHP 7 >= 7.1.2, PHP 8)
hash_hkdf — Generate a HKDF key derivation of a supplied key input
说明
string
$algo
,string
$key
,int
$length
= 0,string
$info
= "",string
$salt
= ""): string
参数
-
algo
-
Name of selected hashing algorithm (i.e. "sha256", "sha512", "haval160,4", etc..) See hash_algos() for a list of supported algorithms.
注意:
Non-cryptographic hash functions are not allowed.
-
key
-
Input keying material (raw binary). Cannot be empty.
-
length
-
Desired output length in bytes. Cannot be greater than 255 times the chosen hash function size.
If
length
is0
, the output length will default to the chosen hash function size. -
info
-
Application/context-specific info string.
-
salt
-
Salt to use during derivation.
While optional, adding random salt significantly improves the strength of HKDF.
返回值
Returns a string containing a raw binary representation of the derived key
(also known as output keying material - OKM); or false
on failure.
错误/异常
An E_WARNING
will be raised if key
is empty, algo
is unknown/non-cryptographic,
length
is less than 0
or too large
(greater than 255 times the size of the hash function).
范例
示例 #1 hash_hkdf() example
<?php // Generate a random key, and salt to strengthen it during derivation.$inputKey = random_bytes(32); $salt = random_bytes(16); // Derive a pair of separate keys, using the same input created above.$encryptionKey = hash_hkdf('sha256', $inputKey, 32, 'aes-256-encryption', $salt); $authenticationKey = hash_hkdf('sha256', $inputKey, 32, 'sha-256-authentication', $salt); var_dump($encryptionKey !== $authenticationKey); // bool(true)?>
The above example produces a pair of separate keys, suitable for creation of an encrypt-then-HMAC construct, using AES-256 and SHA-256 for encryption and authentication respectively.
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