This is what I use. Short and sweet.

@implementation NSData (Base64)

- (NSData *)dataWithBase64Encoding
{
        CFDataRef retval = NULL;
        SecTransformRef encodeTrans = 
SecEncodeTransformCreate(kSecBase64Encoding, NULL);
        if (encodeTrans != NULL) {
                if (SecTransformSetAttribute(encodeTrans, 
kSecTransformInputAttributeName, (__bridge CFDataRef)self, NULL))
                        retval = SecTransformExecute(encodeTrans, NULL);
                CFRelease(encodeTrans);
        }
        return CFBridgingRelease(retval);
}

- (NSData *)dataFromBase64Decoding
{
        CFDataRef retval = NULL;
        SecTransformRef decodeTrans = 
SecDecodeTransformCreate(kSecBase64Encoding, NULL);
        if (decodeTrans != NULL) {
                if (SecTransformSetAttribute(decodeTrans, 
kSecTransformInputAttributeName, (__bridge CFDataRef)self, NULL))
                        retval = SecTransformExecute(decodeTrans, NULL);
                CFRelease(decodeTrans);
        }
        return CFBridgingRelease(retval);
}

@end

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