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<link rel="alternate" lang="fr" xml:lang="fr" title="base64 et sha1 sur iPhone" type="text/html" hreflang="fr" href="/Scratch/fr/blog/2010-09-02-base64-and-sha1-on-iPhone/" />
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<title>base64 et sha1 sur iPhone</title>
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<h1>
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base64 et sha1 sur iPhone
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</h1>
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<p>Allons directement à l’essentiel :
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voici deux fonctions à intégrer à votre application iPhone pour afficher l’encodage en base64 ou en hexadecimal du hash sha1 d’un string en Objective-C pour iPhone.</p>
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<p>Pour l’usage c’est très simple, copiez le code dans la classe de votre choix.
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Puis :</p>
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<pre class="twilight">
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<span class="CCCPreprocessorLine">#<span class="CCCPreprocessorDirective">import</span> <span class="String"><span class="String"><</span>CommonCrypto/CommonDigest.h<span class="String">></span></span></span>
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...
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<span class="Support">NSString</span> *b64_hash = [<span class="Variable">self</span> <span class="SupportFunction">b64_sha1<span class="SupportFunction">:</span></span><span class="String"><span class="String">@"</span>some NSString to be sha1'ed<span class="String">"</span></span>];
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...
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<span class="Support">NSString</span> *hex_hash = [<span class="Variable">self</span> <span class="SupportFunction">hex_sha1<span class="SupportFunction">:</span></span><span class="String"><span class="String">@"</span>some NSString to be sha1'ed<span class="String">"</span></span>];
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</pre>
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<p>L’algorithme pour l’encodage en <code>base64</code> doit être programmé sur iPhone.
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Il n’y a pas de librairie officielle qui s’occupe de ça.</p>
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<div class="code"><div class="file"><a href="/Scratch/fr/blog/2010-09-02-base64-and-sha1-on-iPhone/code/iphone_base64_sha1.c"> ➥ iphone_base64_sha1.c </a></div><div class="withfile">
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<pre class="twilight">
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- (<span class="Storage">unsigned</span> <span class="Storage">char</span> *)sha1:(NSString *)baseString result:(<span class="Storage">unsigned</span> <span class="Storage">char</span> *)result {
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<span class="Storage">char</span> *c_baseString=(<span class="Storage">char</span> *)[baseString UTF8String];
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CC_SHA1(c_baseString, <span class="SupportFunction">strlen</span>(c_baseString), result);
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<span class="Keyword">return</span> result;
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}
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- (NSString *)base64:(<span class="Storage">unsigned</span> <span class="Storage">char</span> *)result {
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NSString *password=[[NSString alloc] init];
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<span class="Storage">static</span> <span class="Storage">const</span> <span class="Storage">unsigned</span> <span class="Storage">char</span> cb64[<span class="Constant">65</span>]=<span class="String"><span class="String">"</span>ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/<span class="String">"</span></span>;
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<span class="Keyword">for</span> (<span class="Storage">int</span> i=<span class="Constant">0</span>; i<CC_SHA1_DIGEST_LENGTH; i+=<span class="Constant">3</span>) {
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password=[password stringByAppendingFormat:@<span class="String"><span class="String">"</span><span class="StringConstant">%c</span><span class="StringConstant">%c</span><span class="StringConstant">%c</span><span class="StringConstant">%c</span><span class="String">"</span></span>,
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cb64[(result[i] &<span class="Constant">0xFC</span>)>><span class="Constant">2</span>],
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cb64[((result[i] & <span class="Constant">0x03</span>) << <span class="Constant">4</span>)
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| ((result[i + <span class="Constant">1</span>] & <span class="Constant">0xF0</span>) >> <span class="Constant">4</span>)],
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cb64[((result[i + <span class="Constant">1</span>] & <span class="Constant">0x0F</span>) << <span class="Constant">2</span>)
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| ((result[i + <span class="Constant">2</span>] & <span class="Constant">0xC0</span>) >> <span class="Constant">6</span>)],
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cb64[result[i+<span class="Constant">2</span>]&<span class="Constant">0x3F</span>]
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];
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}
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<span class="Keyword">return</span> password;
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}
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- (NSString *)hexadecimalRepresentation:(<span class="Storage">unsigned</span> <span class="Storage">char</span> *)result {
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NSString *password=[[NSString alloc] init];
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<span class="Keyword">for</span> (<span class="Storage">int</span> i=<span class="Constant">0</span>; i<CC_SHA1_DIGEST_LENGTH; i++) {
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password=[password stringByAppendingFormat:@<span class="String"><span class="String">"</span><span class="StringConstant">%02x</span><span class="String">"</span></span>, result[i]];
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}
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<span class="Keyword">return</span> password;
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}
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- (NSString *)b64_sha1:(NSString *)inputString {
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<span class="Storage">unsigned</span> <span class="Storage">char</span> result[CC_SHA1_DIGEST_LENGTH+<span class="Constant">1</span>];
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[self sha1:inputString result:result];
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<span class="Keyword">return</span> [self base64:result];
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}
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- (NSString *)hex_sha1:(NSString *)inputString {
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<span class="Storage">unsigned</span> <span class="Storage">char</span> result[CC_SHA1_DIGEST_LENGTH+<span class="Constant">1</span>];
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[self sha1:inputString result:result];
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<span class="Keyword">return</span> [self hexadecimalRepresentation:result];
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}
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</pre>
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<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.fr">Droits de reproduction ©, Yann Esposito</a>
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Écrit le : 02/09/2010
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modifié le : 04/09/2010
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