scratch/multi/blog/2010-09-02-base64-and-sha1-on-iPhone.md

isHidden: false menupriority: 1 kind: article created_at: 2010-09-02T00:02:17+02:00 fr: title: base64 et sha1 sur iPhone en: title: base64 and sha1 on iPhone author_name: Yann Esposito author_uri: yannesposito.com tags: - iPhone - Objective-C en: - programming fr: - programmation

fr: Allons directement à l'essentiel : fr: 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. en: Lets be straight: en: here are two functions to add to your code to have base64 and hexadecimal version of the sha1 hash of an NSString.

fr: Pour l'usage c'est très simple, copiez le code dans la classe de votre choix. fr: Puis : en: To use it, simply copy the code in your class and use as this:

#import <CommonCrypto/CommonDigest.h> ... NSString *b64_hash = [self b64_sha1:@"some NSString to be sha1'ed"]; ... NSString *hex_hash = [self hex_sha1:@"some NSString to be sha1'ed"];

en: The base64 algorithm must be programmed by hand on iPhone! fr: L'algorithme pour l'encodage en base64 doit être programmé sur iPhone. fr: Il n'y a pas de librairie officielle qui s'occupe de ça.

• (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; }

• (NSString *)base64:(unsigned char *)result { NSString *password=[[NSString alloc] init]; 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] ];
  } return password; }

• (NSString *)hexadecimalRepresentation:(unsigned char *)result { NSString *password=[[NSString alloc] init]; for (int i=0; i<CC_SHA1_DIGEST_LENGTH; i++) { password=[password stringByAppendingFormat:@"%02x", result[i]]; } return password; }

• (NSString *)b64_sha1:(NSString *)inputString { unsigned char result[CC_SHA1_DIGEST_LENGTH+1]; [self sha1:inputString result:result]; return [self base64:result]; }

• (NSString *)hex_sha1:(NSString *)inputString { unsigned char result[CC_SHA1_DIGEST_LENGTH+1]; [self sha1:inputString result:result]; return [self hexadecimalRepresentation:result]; }