hash_hkdf()

(PHP 7 >= 7.1.2)

Generate a HKDF key derivation of a supplied key input

说明

参数

Name of selected hashing algorithm (i.e."sha256","sha512","haval160,4", etc..)Seehash_algos()for a list of supported algorithms.Note:

Non-cryptographic hash functions are not allowed.

Input keying material (raw binary). Cannot be empty.

Desired output length in bytes. Cannot be greater than 255 times the chosen hash function size.

If$lengthis0, the output length will default to the chosen hash function size.

Application/context-specific info string.

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);orFALSEon failure.

错误／异常

AnE_WARNINGwill be raised if$ikmis empty,$algois unknown/non-cryptographic,$lengthis less than0or too large (greater than 255 times the size of the hash function).

范例

Example #1hash_hkdf()example

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.

参见

• hash_pbkdf2() 生成所提供密码的 PBKDF2 密钥导出
• » RFC 5869
• » userland implementation

鹏仔微信 15129739599 鹏仔QQ344225443 鹏仔前端 pjxi.com 共享博客 sharedbk.com