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feature/fixRandomGeneration #27

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6 changes: 5 additions & 1 deletion CleverSDK/CleverSDK.m
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Original file line number Diff line number Diff line change
Expand Up @@ -42,14 +42,18 @@ + (void)startWithClientId:(NSString *)clientId RedirectURI:(NSString *)redirectU

+ (NSString *)generateRandomString:(int)length {
NSAssert(length % 2 == 0, @"Must generate random string with even length");

NSMutableData *data = [NSMutableData dataWithLength:length / 2];
NSAssert(SecRandomCopyBytes(kSecRandomDefault, length, [data mutableBytes]) == 0, @"Failure in SecRandomCopyBytes: %d", errno);
int errorCode __unused = SecRandomCopyBytes(kSecRandomDefault, length, [data mutableBytes]);
NSAssert(errorCode == 0, @"Failure in SecRandomCopyBytes: %d", errorCode);

NSMutableString *hexString = [NSMutableString stringWithCapacity:(length)];
const unsigned char *dataBytes = [data bytes];
for (int i = 0; i < length / 2; ++i)
{
[hexString appendFormat:@"%02x", (unsigned int)dataBytes[i]];
}

return [NSString stringWithString:hexString];
}

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