Swift Language PBKDF2 Key Derivation Password Based Key Derivation 2 (Swift 2.3)
Example
See Swift 3 example for usage information and notes
func pbkdf2SHA1(password: String, salt: [UInt8], keyCount: Int, rounds: Int) -> [UInt8]? {
return pbkdf2(CCPBKDFAlgorithm(kCCPRFHmacAlgSHA1), password:password, salt:salt, keyCount:keyCount, rounds:UInt32(rounds))
}
func pbkdf2SHA256(password: String, salt: [UInt8], keyCount: Int, rounds: Int) -> [UInt8]? {
return pbkdf2(CCPBKDFAlgorithm(kCCPRFHmacAlgSHA256), password:password, salt:salt, keyCount:keyCount, rounds:UInt32(rounds))
}
func pbkdf2SHA512(password: String, salt: [UInt8], keyCount: Int, rounds: Int) -> [UInt8]? {
return pbkdf2(CCPBKDFAlgorithm(kCCPRFHmacAlgSHA512), password:password, salt:salt, keyCount:keyCount, rounds:UInt32(rounds))
}
func pbkdf2(hash :CCPBKDFAlgorithm, password: String, salt: [UInt8], keyCount: Int, rounds: UInt32!) -> [UInt8]! {
let derivedKey = [UInt8](count:keyCount, repeatedValue:0)
let passwordData = password.dataUsingEncoding(NSUTF8StringEncoding)!
let derivationStatus = CCKeyDerivationPBKDF(
CCPBKDFAlgorithm(kCCPBKDF2),
UnsafePointer<Int8>(passwordData.bytes), passwordData.length,
UnsafePointer<UInt8>(salt), salt.count,
CCPseudoRandomAlgorithm(hash),
rounds,
UnsafeMutablePointer<UInt8>(derivedKey),
derivedKey.count)
if (derivationStatus != 0) {
print("Error: \(derivationStatus)")
return nil;
}
return derivedKey
}
Example usage:
let password = "password"
// let salt = [UInt8]("saltData".utf8)
let salt = [UInt8]([0x73, 0x61, 0x6c, 0x74, 0x44, 0x61, 0x74, 0x61])
let rounds = 100_000
let keyCount = 16
let derivedKey = pbkdf2SHA1(password, salt:salt, keyCount:keyCount, rounds:rounds)
print("derivedKey (SHA1): \(NSData(bytes:derivedKey!, length:derivedKey!.count))")
Example Output:
derivedKey (SHA1): <6b9d4fa3 0385d128 f6d196ee 3f1d6dbf>
