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# LXI.Mhash Functions

# 介紹

These functions are intended to work with mhash. Mhash can be used to create checksums, message digests, message authentication codes, and more.

This is an interface to the mhash library. mhash supports a wide variety of hash algorithms such as MD5, SHA1, GOST, and many others. For a complete list of supported hashes, refer to the documentation of mhash. The general rule is that you can access the hash algorithm from PHP with MHASH_HASHNAME. For example, to access TIGER you use the PHP constant MHASH_TIGER.

# 需求

To use it, download the mhash distribution from its web site and follow the included installation instructions.

# 安裝

You need to compile PHP with the --with-mhash[=DIR] parameter to enable this extension. DIR is the mhash install directory.

# 執行時期組態

`php.ini`中沒有定義此延伸的組態指令。

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

Here is a list of hashes which are currently supported by mhash. If a hash is not listed here, but is listed by mhash as supported, you can safely assume that this documentation is outdated.

- `MHASH_MD5`

- `MHASH_SHA1`

- `MHASH_HAVAL256`

- `MHASH_HAVAL192`

- `MHASH_HAVAL160`

- `MHASH_HAVAL128`

- `MHASH_RIPEMD160`

- `MHASH_GOST`

- `MHASH_TIGER`

- `MHASH_CRC32`

- `MHASH_CRC32B`

# 範例

示範 1.Compute the MD5 digest and hmac and print it out as hex
`<?php $input = "what do ya want for nothing?"; $hash = mhash(MHASH_MD5, $input); echo "The hash is " . bin2hex($hash) . "<br />\n"; $hash = mhash(MHASH_MD5, $input, "Jefe"); echo "The hmac is " . bin2hex($hash) . "<br />\n"; ?>`
This will produce:
    The hash is d03cb659cbf9192dcd066272249f8412
    The hmac is 750c783e6ab0b503eaa86e310a5db738

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