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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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< pre > < code class = "objective-c" > #import < CommonCrypto/CommonDigest.h>
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...
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NSString *b64_hash = [self b64_sha1:@"some NSString to be sha1'ed"];
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...
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NSString *hex_hash = [self hex_sha1:@"some NSString to be sha1'ed"];
< / code > < / 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 = "codefile" > < a href = "/Scratch/fr/blog/2010-09-02-base64-and-sha1-on-iPhone/code/iphone_base64_sha1.c" > ➥ iphone_base64_sha1.c< / a > < / div >
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< pre > < code class = "c" >
- (unsigned char *)sha1:(NSString *)baseString result:(unsigned char *)result {
char *c_baseString=(char *)[baseString UTF8String];
CC_SHA1(c_baseString, strlen(c_baseString), result);
return result;
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}
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- (NSString *)base64:(unsigned char *)result {
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NSString *password=[[NSString alloc] init];
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static const unsigned char cb64[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
for (int i=0; i< CC_SHA1_DIGEST_LENGTH; i+=3) {
password=[password stringByAppendingFormat:@"%c%c%c%c",
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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- (NSString *)hexadecimalRepresentation:(unsigned char *)result {
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NSString *password=[[NSString alloc] init];
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for (int i=0; i< CC_SHA1_DIGEST_LENGTH; i++) {
password=[password stringByAppendingFormat:@"%02x", result[i]];
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}
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return password;
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}
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- (NSString *)b64_sha1:(NSString *)inputString {
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unsigned char result[CC_SHA1_DIGEST_LENGTH+1];
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[self sha1:inputString result:result];
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return [self base64:result];
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}
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- (NSString *)hex_sha1:(NSString *)inputString {
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unsigned char result[CC_SHA1_DIGEST_LENGTH+1];
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[self sha1:inputString result:result];
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return [self hexadecimalRepresentation:result];
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}
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Écrit le : 02/09/2010
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modifié le : 16/11/2011
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