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base64 et sha1 sur iPhone
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< p > Allons directement à l’ essentiel :
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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#import < CommonCrypto/CommonDigest.h>
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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 > ];
...
< 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 > ];
< / pre >
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< p > L’ algorithme pour l’ encodage en < code > base64< / code > doit être programmé sur iPhone.
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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- (unsigned char *)sha1:(< span class = "Support" > NSString< / span > *)baseString result:(unsigned char *)result {
char *c_baseString=(char *)[baseString < span class = "SupportFunction" > UTF8String< / span > ];
CC_SHA1(c_baseString, strlen(c_baseString), result);
return result;
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}
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- (< span class = "Support" > NSString< / span > *)base64:(unsigned char *)result {
< span class = "Support" > NSString< / span > *password=[[< span class = "Support" > NSString< / span > < span class = "SupportFunction" > alloc< / span > ] < span class = "SupportFunction" > init< / span > ];
static const unsigned char cb64[65]=" ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" ;
for (int i=0; i< CC_SHA1_DIGEST_LENGTH; i+=3) {
password=[password < span class = "SupportFunction" > stringByAppendingFormat< span class = "SupportFunction" > :< / span > < / span > < span class = "String" > < span class = "String" > @" < / span > %c%c%c%c< span class = "String" > " < / span > < / span > ,
cb64[(result[i] & 0xFC)> > 2],
cb64[((result[i] & 0x03) < < 4)
| ((result[i + 1] & 0xF0) > > 4)],
cb64[((result[i + 1] & 0x0F) < < 2)
| ((result[i + 2] & 0xC0) > > 6)],
cb64[result[i+2]& 0x3F]
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];
}
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return password;
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}
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- (< span class = "Support" > NSString< / span > *)hexadecimalRepresentation:(unsigned char *)result {
< span class = "Support" > NSString< / span > *password=[[< span class = "Support" > NSString< / span > < span class = "SupportFunction" > alloc< / span > ] < span class = "SupportFunction" > init< / span > ];
for (int i=0; i< CC_SHA1_DIGEST_LENGTH; i++) {
password=[password < span class = "SupportFunction" > stringByAppendingFormat< span class = "SupportFunction" > :< / span > < / span > < span class = "String" > < span class = "String" > @" < / span > %02x< span class = "String" > " < / span > < / span > , result[i]];
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}
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return password;
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}
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- (< span class = "Support" > NSString< / span > *)b64_sha1:(< span class = "Support" > NSString< / span > *)inputString {
unsigned char result[CC_SHA1_DIGEST_LENGTH+1];
[< span class = "Variable" > self< / span > < span class = "SupportFunction" > sha1< span class = "SupportFunction" > :< / span > < / span > inputString < span class = "SupportFunction" > result< span class = "SupportFunction" > :< / span > < / span > result];
return [< span class = "Variable" > self< / span > < span class = "SupportFunction" > base64< span class = "SupportFunction" > :< / span > < / span > result];
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}
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- (< span class = "Support" > NSString< / span > *)hex_sha1:(< span class = "Support" > NSString< / span > *)inputString {
unsigned char result[CC_SHA1_DIGEST_LENGTH+1];
[< span class = "Variable" > self< / span > < span class = "SupportFunction" > sha1< span class = "SupportFunction" > :< / span > < / span > inputString < span class = "SupportFunction" > result< span class = "SupportFunction" > :< / span > < / span > result];
return [< span class = "Variable" > self< / span > < span class = "SupportFunction" > hexadecimalRepresentation< span class = "SupportFunction" > :< / span > < / span > result];
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}
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Écrit le : 02/09/2010
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