...
    PKCS5_PBKDF2_HMAC(pass, strlen(pass), "2!@$(5#@532@%#$253l5#@$", 2, ITERATION, EVP_sha512(), outputBytes, digest);
    ...

...
const salt = "some constant value";
crypto.pbkdf2(
    password,
    salt,
    iterations,
    keyLength,
    "sha256",
    function (err, derivedKey) { ... }
);

...
CCKeyDerivationPBKDF(kCCPBKDF2,
                     password,
                     passwordLen,
                     "2!@$(5#@532@%#$253l5#@$",
                     2,
                     kCCPRFHmacAlgSHA256,
                     100000,
                     derivedKey,
                     derivedKeyLen);
...

...
$hash = hash_pbkdf2('sha256', $password, '2!@$(5#@532@%#$253l5#@$', 100000)
...

...
from hashlib import pbkdf2_hmac
dk = pbkdf2_hmac('sha256', password, '2!@$(5#@532@%#$253l5#@$', 100000)
...

...
dk = OpenSSL::PKCS5.pbkdf2_hmac(password, '2!@$(5#@532@%#$253l5#@$', 100000, 256, digest)
...

...
let ITERATION = UInt32(100000)
let salt = "2!@$(5#@532@%#$253l5#@$"
...
CCKeyDerivationPBKDF(CCPBKDFAlgorithm(kCCPBKDF2),
password,
passwordLength,
salt,
salt.lengthOfBytesUsingEncoding(NSUTF8StringEncoding),
CCPseudoRandomAlgorithm(kCCPRFHmacAlgSHA256),
ITERATION,
derivedKey,
derivedKeyLength)
...

    ...
    crypt(password, "2!@$(5#@532@%#$253l5#@$");
    ...

    ...
    salt := "2!@$(5#@532@%#$253l5#@$"
    password := get_password()
    sha256.Sum256([]byte(salt + password)
    ...

    ...
    crypt($password, '2!@$(5#@532@%#$253l5#@$');
    ...

    ...
    from django.contrib.auth.hashers import make_password
    make_password(password, salt="2!@$(5#@532@%#$253l5#@$")
    ...

require 'openssl'
...
password = get_password()
salt = '2!@$(5#@532@%#$253l5#@$'
hash = OpenSSL::Digest::SHA256.digest(salt + password)
...

...
let password = getPassword();
let salt = password;
crypto.pbkdf2(
    password,
    salt,
    iterations,
    keyLength,
    "sha256",
    function (err, derivedKey) { ... }
);

function register(){
  $password = $_GET['password'];
  $username = $_GET['username'];

  $hash = hash_pbkdf2('sha256', $password, $password, 100000);
...

import hashlib, binascii

def register(request):
  password = request.GET['password']
  username = request.GET['username']

  dk = hashlib.pbkdf2_hmac('sha256', password, password, 100000)
  hash = binascii.hexlify(dk)
  store(username, hash)
...

require 'openssl'
...
req = Rack::Response.new
password = req.params['password']
...
key = OpenSSL::PKCS5::pbkdf2_hmac(password, password, 100000, 256, 'SHA256')
...

  string salt = ConfigurationManager.AppSettings["salt"];
  ...
  Rfc2898DeriveBytes rfc = new Rfc2898DeriveBytes("password", Encoding.ASCII.GetBytes(salt));
  ...
  

    ...
    salt = getenv("SALT");
    PKCS5_PBKDF2_HMAC(pass, sizeof(pass), salt, sizeof(salt), ITERATION, EVP_sha512(), outputBytes, digest);
    ...

app.get('/pbkdf2', function(req, res) {
    ...
    let salt = req.params['salt'];
    crypto.pbkdf2(
        password,
        salt,
        iterations,
        keyLength,
        "sha256",
        function (err, derivedKey) { ... }
    );
}

...
@property (strong, nonatomic) IBOutlet UITextField *inputTextField;
...
NSString *salt = _inputTextField.text;
const char *salt_cstr = [salt cStringUsingEncoding:NSUTF8StringEncoding];
...
CCKeyDerivationPBKDF(kCCPBKDF2,
                     password,
                     passwordLen,
                     salt_cstr,
                     salt.length,
                     kCCPRFHmacAlgSHA256,
                     100000,
                     derivedKey,
                     derivedKeyLen);
...

function register(){
  $password = $_GET['password'];
  $username = $_GET['username'];
  $salt = getenv('SALT');

  $hash = hash_pbkdf2('sha256', $password, $salt, 100000);
...

import hashlib, binascii

def register(request):
  password = request.GET['password']
  username = request.GET['username']
  salt = os.environ['SALT']

  dk = hashlib.pbkdf2_hmac('sha256', password, salt, 100000)
  hash = binascii.hexlify(dk)
  store(username, hash)
...

...
salt=io.read
key = OpenSSL::PKCS5::pbkdf2_hmac(pass, salt, iter_count, 256, 'SHA256')
...

...
@IBOutlet weak var inputTextField : UITextField!
...
let salt = (inputTextField.text as NSString).dataUsingEncoding(NSUTF8StringEncoding)
let saltPointer = UnsafePointer<UInt8>(salt.bytes)
let saltLength = size_t(salt.length)
...
let algorithm : CCPBKDFAlgorithm = CCPBKDFAlgorithm(kCCPBKDF2)
let prf : CCPseudoRandomAlgorithm = CCPseudoRandomAlgorithm(kCCPRFHmacAlgSHA256)
CCKeyDerivationPBKDF(algorithm,
                     passwordPointer,
                     passwordLength,
                     saltPointer,
                     saltLength,
                     prf,
                     100000,
                     derivedKeyPointer,
                     derivedKeyLength)
...

    ...
    salt = getenv("SALT");
    password = crypt(getpass("Password:"), salt);
    ...

func someHandler(w http.ResponseWriter, r *http.Request){
  r.parseForm()
  salt := r.FormValue("salt")
  password := r.FormValue("password")
  ...
  sha256.Sum256([]byte(salt + password))
}

import hashlib, binascii

def register(request):
  password = request.GET['password']
  username = request.GET['username']
  salt = os.environ['SALT']

  hash = hashlib.md5("%s:%s" % (salt, password,)).hexdigest()
  store(username, hash)
...

    ...
    salt = req.params['salt']
    hash = @userPassword.crypt(salt)
    ...

let saltData = userInput.data(using: .utf8)

sharedSecret.hkdfDerivedSymmetricKey(
    using: SHA256.self,
    salt: saltData,
    sharedInfo: info,
    outputByteCount: 1000
)