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<h1>base64 and sha1 on iPhone</h1>
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<p>Lets be straight: here are two functions to add to your code to have <code>base64</code> and <code>hexadecimal</code> version of the <code>sha1</code> hash of an NSString.</p>
<p>To use it, simply copy the code in your class and use as this:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode objective-c"><code class="sourceCode objectivec"><a class="sourceLine" id="cb1-1" title="1"><span class="pp">#import </span><span class="im">&lt;CommonCrypto/CommonDigest.h&gt;</span></a>
<a class="sourceLine" id="cb1-2" title="2">...</a>
<a class="sourceLine" id="cb1-3" title="3">NSString *b64_hash = [<span class="kw">self</span> b64_sha1:<span class="st">@&quot;some NSString to be sha1'ed&quot;</span>];</a>
<a class="sourceLine" id="cb1-4" title="4">...</a>
<a class="sourceLine" id="cb1-5" title="5">NSString *hex_hash = [<span class="kw">self</span> hex_sha1:<span class="st">@&quot;some NSString to be sha1'ed&quot;</span>];</a></code></pre></div>
<p>The <code>base64</code> algorithm must be programmed by hand on iPhone!</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode c"><code class="sourceCode c"><a class="sourceLine" id="cb2-1" title="1"></a>
<a class="sourceLine" id="cb2-2" title="2">- (<span class="dt">unsigned</span> <span class="dt">char</span> *)sha1:(NSString *)baseString result:(<span class="dt">unsigned</span> <span class="dt">char</span> *)result {</a>
<a class="sourceLine" id="cb2-3" title="3"> <span class="dt">char</span> *c_baseString=(<span class="dt">char</span> *)[baseString UTF8String];</a>
<a class="sourceLine" id="cb2-4" title="4"> CC_SHA1(c_baseString, strlen(c_baseString), result);</a>
<a class="sourceLine" id="cb2-5" title="5"> <span class="cf">return</span> result;</a>
<a class="sourceLine" id="cb2-6" title="6">}</a>
<a class="sourceLine" id="cb2-7" title="7"></a>
<a class="sourceLine" id="cb2-8" title="8">- (NSString *)base64:(<span class="dt">unsigned</span> <span class="dt">char</span> *)result {</a>
<a class="sourceLine" id="cb2-9" title="9"> NSString *password=[[NSString alloc] init];</a>
<a class="sourceLine" id="cb2-10" title="10"> <span class="dt">static</span> <span class="dt">const</span> <span class="dt">unsigned</span> <span class="dt">char</span> cb64[<span class="dv">65</span>]=<span class="st">&quot;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/&quot;</span>;</a>
<a class="sourceLine" id="cb2-11" title="11"> <span class="cf">for</span> (<span class="dt">int</span> i=<span class="dv">0</span>; i&lt;CC_SHA1_DIGEST_LENGTH; i+=<span class="dv">3</span>) {</a>
<a class="sourceLine" id="cb2-12" title="12"> password=[password stringByAppendingFormat:@<span class="st">&quot;%c%c%c%c&quot;</span>,</a>
<a class="sourceLine" id="cb2-13" title="13"> cb64[(result[i] &amp;<span class="bn">0xFC</span>)&gt;&gt;<span class="dv">2</span>],</a>
<a class="sourceLine" id="cb2-14" title="14"> cb64[((result[i] &amp; <span class="bn">0x03</span>) &lt;&lt; <span class="dv">4</span>)</a>
<a class="sourceLine" id="cb2-15" title="15"> | ((result[i + <span class="dv">1</span>] &amp; <span class="bn">0xF0</span>) &gt;&gt; <span class="dv">4</span>)],</a>
<a class="sourceLine" id="cb2-16" title="16"> cb64[((result[i + <span class="dv">1</span>] &amp; <span class="bn">0x0F</span>) &lt;&lt; <span class="dv">2</span>)</a>
<a class="sourceLine" id="cb2-17" title="17"> | ((result[i + <span class="dv">2</span>] &amp; <span class="bn">0xC0</span>) &gt;&gt; <span class="dv">6</span>)],</a>
<a class="sourceLine" id="cb2-18" title="18"> cb64[result[i+<span class="dv">2</span>]&amp;<span class="bn">0x3F</span>]</a>
<a class="sourceLine" id="cb2-19" title="19"> ]; </a>
<a class="sourceLine" id="cb2-20" title="20"> }</a>
<a class="sourceLine" id="cb2-21" title="21"> <span class="cf">return</span> password;</a>
<a class="sourceLine" id="cb2-22" title="22">}</a>
<a class="sourceLine" id="cb2-23" title="23"></a>
<a class="sourceLine" id="cb2-24" title="24">- (NSString *)hexadecimalRepresentation:(<span class="dt">unsigned</span> <span class="dt">char</span> *)result {</a>
<a class="sourceLine" id="cb2-25" title="25"> NSString *password=[[NSString alloc] init];</a>
<a class="sourceLine" id="cb2-26" title="26"> <span class="cf">for</span> (<span class="dt">int</span> i=<span class="dv">0</span>; i&lt;CC_SHA1_DIGEST_LENGTH; i++) {</a>
<a class="sourceLine" id="cb2-27" title="27"> password=[password stringByAppendingFormat:@<span class="st">&quot;%02x&quot;</span>, result[i]];</a>
<a class="sourceLine" id="cb2-28" title="28"> }</a>
<a class="sourceLine" id="cb2-29" title="29"> <span class="cf">return</span> password;</a>
<a class="sourceLine" id="cb2-30" title="30">}</a>
<a class="sourceLine" id="cb2-31" title="31"></a>
<a class="sourceLine" id="cb2-32" title="32">- (NSString *)b64_sha1:(NSString *)inputString {</a>
<a class="sourceLine" id="cb2-33" title="33"> <span class="dt">unsigned</span> <span class="dt">char</span> result[CC_SHA1_DIGEST_LENGTH+<span class="dv">1</span>];</a>
<a class="sourceLine" id="cb2-34" title="34"> [self sha1:inputString result:result];</a>
<a class="sourceLine" id="cb2-35" title="35"> <span class="cf">return</span> [self base64:result];</a>
<a class="sourceLine" id="cb2-36" title="36">}</a>
<a class="sourceLine" id="cb2-37" title="37"></a>
<a class="sourceLine" id="cb2-38" title="38">- (NSString *)hex_sha1:(NSString *)inputString {</a>
<a class="sourceLine" id="cb2-39" title="39"> <span class="dt">unsigned</span> <span class="dt">char</span> result[CC_SHA1_DIGEST_LENGTH+<span class="dv">1</span>];</a>
<a class="sourceLine" id="cb2-40" title="40"> [self sha1:inputString result:result];</a>
<a class="sourceLine" id="cb2-41" title="41"> <span class="cf">return</span> [self hexadecimalRepresentation:result];</a>
<a class="sourceLine" id="cb2-42" title="42">}</a></code></pre></div>
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Published on 2010-09-02
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