Convert Device ID as NSData to NString in IOS
// function to get device id as string from NSData
-(NSString *)convertTokenToDeviceID:(NSData *)token
{
NSMutableString *deviceID = [NSMutableString string];
// iterate through the bytes and convert to
hexunsigned char *ptr = (unsigned char *)[token bytes];
for (NSInteger i=0; i < 32; ++i) {
[deviceID appendString:[NSString stringWithFormat:@"%02x", ptr[i]]];
}
return deviceID;
}
How to compute SHA1 digest for NSString? 
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