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< title > base64 and sha1 on iPhone< / title >
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base64 and sha1 on iPhone
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< p > Lets be straight:
here are two functions to add to your code to have < code > base64< / code > and < code > hexadecimal< / code > version of the < code > sha1< / code > hash of an NSString.< / p >
< p > To use it, simply copy the code in your class and use as this:< / p >
< pre class = "twilight" >
< 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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< 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 >
< p > The < code > base64< / code > algorithm must be programmed by hand on iPhone!< / p >
< div class = "code" > < div class = "file" > < a href = "/Scratch/en/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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- (< 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 {
< span class = "Storage" > char< / span > *c_baseString=(< span class = "Storage" > char< / span > *)[baseString UTF8String];
CC_SHA1(c_baseString, < span class = "SupportFunction" > strlen< / span > (c_baseString), result);
< span class = "Keyword" > return< / span > result;
}
- (NSString *)base64:(< span class = "Storage" > unsigned< / span > < span class = "Storage" > char< / span > *)result {
NSString *password=[[NSString alloc] init];
< 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 > ;
< 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 > ) {
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 > ,
cb64[(result[i] & < span class = "Constant" > 0xFC< / span > )> > < span class = "Constant" > 2< / span > ],
cb64[((result[i] & < span class = "Constant" > 0x03< / span > ) < < < span class = "Constant" > 4< / span > )
| ((result[i + < span class = "Constant" > 1< / span > ] & < span class = "Constant" > 0xF0< / span > ) > > < span class = "Constant" > 4< / span > )],
cb64[((result[i + < span class = "Constant" > 1< / span > ] & < span class = "Constant" > 0x0F< / span > ) < < < span class = "Constant" > 2< / span > )
| ((result[i + < span class = "Constant" > 2< / span > ] & < span class = "Constant" > 0xC0< / span > ) > > < span class = "Constant" > 6< / span > )],
cb64[result[i+< span class = "Constant" > 2< / span > ]& < span class = "Constant" > 0x3F< / span > ]
];
}
< span class = "Keyword" > return< / span > password;
}
- (NSString *)hexadecimalRepresentation:(< span class = "Storage" > unsigned< / span > < span class = "Storage" > char< / span > *)result {
NSString *password=[[NSString alloc] init];
< span class = "Keyword" > for< / span > (< span class = "Storage" > int< / span > i=< span class = "Constant" > 0< / span > ; i< CC_SHA1_DIGEST_LENGTH; i++) {
password=[password stringByAppendingFormat:@< span class = "String" > < span class = "String" > " < / span > < span class = "StringConstant" > %02x< / span > < span class = "String" > " < / span > < / span > , result[i]];
}
< span class = "Keyword" > return< / span > password;
}
- (NSString *)b64_sha1:(NSString *)inputString {
< span class = "Storage" > unsigned< / span > < span class = "Storage" > char< / span > result[CC_SHA1_DIGEST_LENGTH+< span class = "Constant" > 1< / span > ];
[self sha1:inputString result:result];
< span class = "Keyword" > return< / span > [self base64:result];
}
- (NSString *)hex_sha1:(NSString *)inputString {
< span class = "Storage" > unsigned< / span > < span class = "Storage" > char< / span > result[CC_SHA1_DIGEST_LENGTH+< span class = "Constant" > 1< / span > ];
[self sha1:inputString result:result];
< span class = "Keyword" > return< / span > [self hexadecimalRepresentation:result];
}
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