Question

I’m using the following function for SHA1 hash from NSString in my application:

-(NSString *)stringToSha1:(NSString *)str{
    const char *cstr = [str cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:str.length];

    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;

}

This works like a charm on my iphone devices with ios 5.0 and up, but on my iPad running version 4.3.5 it crashes on the line

CC_SHA1(data.bytes, data.length, digest);

It says the following:

dyld: lazy symbol binding failed: can’t resolve symbol _CC_SHA1 in
because dependent dylib #3 could not be loaded

dyld: can’t resolve symbol _CC_SHA1 in because dependent dylib #3 could not be loaded

Any ideas on how to make it work on my iPad 4.3.5 device?

Answer 1

Found the solution myself, though i have no idea why it worked.

Removed the Framework “libcommonCrypto.dylib” from my project, clean, build and it worked.

Tested on IOS 4.1 and 4.3, works like a charm.