Comments on: Objective-C SHA1 Function for the iPhone http://spitzkoff.com/craig/?p=122 Craig's blog about Life and Software Development Fri, 27 Aug 2010 16:21:27 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Calculer le hash digest SHA1 en objective-C « My iPhone development scrapbook http://spitzkoff.com/craig/?p=122&cpage=1#comment-439 Calculer le hash digest SHA1 en objective-C « My iPhone development scrapbook Fri, 27 Aug 2010 12:44:28 +0000 http://spitzkoff.com/craig/?p=122#comment-439 [...] le hash digest SHA1 en objective-C Je suis tombé sur cette fonction donné sur The Reluctant Blogger, cette fonction retourne le hash sha1 équivalent à la fonction php [...] [...] le hash digest SHA1 en objective-C Je suis tombé sur cette fonction donné sur The Reluctant Blogger, cette fonction retourne le hash sha1 équivalent à la fonction php [...]

]]> By: Mark Lorenz http://spitzkoff.com/craig/?p=122&cpage=1#comment-389 Mark Lorenz Sat, 24 Apr 2010 18:13:23 +0000 http://spitzkoff.com/craig/?p=122#comment-389 The PHP SHA1() function uses ASCII encoding. You can verify this by digesting a string containing something like "Ň" with your code, and with PHPs SHA1(). As long as your input string is guaranteed to contain only ASCII characters it will work fine. I suggest updating the code to: -(NSString*) digest:(NSString*)input{ NSData *data = [input dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; uint8_t digest[CC_SHA1_DIGEST_LENGTH]; CC_SHA1(data.bytes, data.length, digest); NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2]; for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) [output appendFormat:@"%02x", digest[i]]; return output; } The PHP SHA1() function uses ASCII encoding. You can verify this by digesting a string containing something like “Ň” with your code, and with PHPs SHA1(). As long as your input string is guaranteed to contain only ASCII characters it will work fine.

I suggest updating the code to:
-(NSString*) digest:(NSString*)input{
NSData *data = [input dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
uint8_t digest[CC_SHA1_DIGEST_LENGTH];
CC_SHA1(data.bytes, data.length, digest);
NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];

for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)
[output appendFormat:@"%02x", digest[i]];

return output;
}

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