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POCCKeyDerivationPBKDF on iOS5
 

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    <p>I'm trying to write a password encryption function into my app, following <a href="http://blog.securemacprogramming.com/2012/07/password-checking-with-commoncrypto/" rel="nofollow">this article</a>.</p> <p>I wrote a function that runs the <code>CCCalibratePBKDF</code> function and outputs the number of rounds. </p> <pre><code>const uint32_t oneSecond = 1000; uint rounds = CCCalibratePBKDF(kCCPBKDF2, predictedPasswordLength, predictedSaltLength, kCCPRFHmacAlgSHA256, kCCKeySizeAES128, oneSecond); </code></pre> <p>This works perfectly, but when I try to implement the next part it all goes wrong.</p> <p>I can start writing the <code>CCKeyDerivationPBKDF</code> function call and it auto-completes the function and all the parameters. As I go through filling it in all the parameters are also auto-completed.</p> <pre><code>- (NSData *)authenticationDataForPassword: (NSString *)password salt: (NSData *)salt rounds: (uint) rounds { const NSString *plainData = @"Fuzzy Aliens"; uint8_t key[kCCKeySizeAES128] = {0}; int keyDerivationResult = CCKeyDerivationPBKDF(kCCPBKDF2, [password UTF8String], [password lengthOfBytesUsingEncoding: NSUTF8StringEncoding], [salt bytes], [salt length], kCCPRFHmacAlgSHA256, rounds, key, kCCKeySizeAES128); if (keyDerivationResult == kCCParamError) { //you shouldn't get here with the parameters as above return nil; } uint8_t hmac[CC_SHA256_DIGEST_LENGTH] = {0}; CCHmac(kCCHmacAlgSHA256, key, kCCKeySizeAES128, [plainData UTF8String], [plainData lengthOfBytesUsingEncoding: NSUTF8StringEncoding], hmac); NSData *hmacData = [NSData dataWithBytes: hmac length: CC_SHA256_DIGEST_LENGTH]; return hmacData; } </code></pre> <p>But as soon as I hit ; it marks an error saying "No matching function for call to 'CCKeyDerivationPBKDF'" and it won't build or anything.</p> <p>I've imported CommonCrypto/CommonKeyDerivation.h and CommonCrypto/CommonCryptor.h as both of these were necessary for the enum names.</p>
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    1. COPost some code!
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    2. COAll the code is in the article I linked. Will post some anyway if you would prefer?
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    3. CONot really an answer, but the premise of the article you cite is completely bogus. You are protecting against an off-line attack. The speed of the device on which the key is legitimately derived really shouldn't be a factor. What matters is how fast the attackers' machines are.
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