Swift Language PBKDF2 Key Derivation Password Based Key Derivation Calibration (Swift 2.3)
Example
See Swift 3 example for usage information and notes
func pbkdf2SHA1Calibrate(password:String, salt:[UInt8], msec:Int) -> UInt32 {
let actualRoundCount: UInt32 = CCCalibratePBKDF(
CCPBKDFAlgorithm(kCCPBKDF2),
password.utf8.count,
salt.count,
CCPseudoRandomAlgorithm(kCCPRFHmacAlgSHA1),
kCCKeySizeAES256,
UInt32(msec));
return actualRoundCount
}
Example usage:
let saltData = [UInt8]([0x73, 0x61, 0x6c, 0x74, 0x44, 0x61, 0x74, 0x61])
let passwordString = "password"
let delayMsec = 100
let rounds = pbkdf2SHA1Calibrate(passwordString, salt:saltData, msec:delayMsec)
print("For \(delayMsec) msec delay, rounds: \(rounds)")
Example Output:
For 100 msec delay, rounds: 94339
