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167 lines
7.9 KiB
HTML
167 lines
7.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Generate a HKDF key derivation of a supplied key input</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.hash-hkdf" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">hash_hkdf</h1>
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<p class="verinfo">(PHP 7 >= 7.1.2)</p><p class="refpurpose"><span class="refname">hash_hkdf</span> — <span class="dc-title">Generate a HKDF key derivation of a supplied key input</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.hash-hkdf-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>hash_hkdf</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$algo</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$ikm</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$info</code><span class="initializer"> = ''</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$salt</code><span class="initializer"> = ''</span></span>
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]]] ) : <span class="type">string</span></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.hash-hkdf-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">algo</code></dt>
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<dd>
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<p class="para">
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Name of selected hashing algorithm (i.e. "sha256", "sha512", "haval160,4", etc..)
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See <span class="function"><a href="hash_algos.html" class="function">hash_algos()</a></span> for a list of supported algorithms.
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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Non-cryptographic hash functions are not allowed.
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</p>
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</p></blockquote>
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</p>
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</dd>
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<dt>
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<code class="parameter">ikm</code></dt>
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<dd>
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<p class="para">
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Input keying material (raw binary). Cannot be empty.
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</p>
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</dd>
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<dt>
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<code class="parameter">length</code></dt>
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<dd>
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<p class="para">
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Desired output length in bytes.
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Cannot be greater than 255 times the chosen hash function size.
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</p>
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<p class="para">
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If <code class="parameter">length</code> is <em>0</em>, the output length
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will default to the chosen hash function size.
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</p>
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</dd>
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<dt>
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<code class="parameter">info</code></dt>
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<dd>
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<p class="para">
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Application/context-specific info string.
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</p>
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</dd>
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<dt>
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<code class="parameter">salt</code></dt>
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<dd>
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<p class="para">
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Salt to use during derivation.
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</p>
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<p class="para">
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While optional, adding random salt significantly improves the strength of HKDF.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.hash-hkdf-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns a string containing a raw binary representation of the derived key
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(also known as output keying material - OKM); or <strong><code>FALSE</code></strong> on failure.
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.hash-hkdf-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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An <strong><code>E_WARNING</code></strong> will be raised if <code class="parameter">ikm</code>
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is empty, <code class="parameter">algo</code> is unknown/non-cryptographic,
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<code class="parameter">length</code> is less than <em>0</em> or too large
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(greater than 255 times the size of the hash function).
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.hash-hkdf-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-893">
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<p><strong>Example #1 <span class="function"><strong>hash_hkdf()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Generate a random key, and salt to strengthen it during derivation.<br /></span><span style="color: #0000BB">$inputKey </span><span style="color: #007700">= </span><span style="color: #0000BB">random_bytes</span><span style="color: #007700">(</span><span style="color: #0000BB">32</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$salt </span><span style="color: #007700">= </span><span style="color: #0000BB">random_bytes</span><span style="color: #007700">(</span><span style="color: #0000BB">16</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Derive a pair of separate keys, using the same input created above.<br /></span><span style="color: #0000BB">$encryptionKey </span><span style="color: #007700">= </span><span style="color: #0000BB">hash_hkdf</span><span style="color: #007700">(</span><span style="color: #DD0000">'sha256'</span><span style="color: #007700">, </span><span style="color: #0000BB">$inputKey</span><span style="color: #007700">, </span><span style="color: #0000BB">32</span><span style="color: #007700">, </span><span style="color: #DD0000">'aes-256-encryption'</span><span style="color: #007700">, </span><span style="color: #0000BB">$salt</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$authenticationKey </span><span style="color: #007700">= </span><span style="color: #0000BB">hash_hkdf</span><span style="color: #007700">(</span><span style="color: #DD0000">'sha256'</span><span style="color: #007700">, </span><span style="color: #0000BB">$inputKey</span><span style="color: #007700">, </span><span style="color: #0000BB">32</span><span style="color: #007700">, </span><span style="color: #DD0000">'sha-256-authentication'</span><span style="color: #007700">, </span><span style="color: #0000BB">$salt</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$encryptionKey </span><span style="color: #007700">!== </span><span style="color: #0000BB">$authenticationKey</span><span style="color: #007700">); </span><span style="color: #FF8000">// bool(true)<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>
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The above example produces a pair of separate keys, suitable for creation of an
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encrypt-then-HMAC construct, using AES-256 and SHA-256 for encryption and
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authentication respectively.
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</p></div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.hash-hkdf-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="hash_pbkdf2.html" class="function" rel="rdfs-seeAlso">hash_pbkdf2()</a> - 生成所提供密码的 PBKDF2 密钥导出</span></li>
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<li class="member"><a href="http://www.faqs.org/rfcs/rfc5869" class="link external">» RFC 5869</a></li>
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<li class="member"><a href="https://github.com/narfbg/hash_hkdf_compat" class="link external">» userland implementation</a></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |