public static function ParagonIE_Sodium_Compat::crypto_kdf_derive_from_key in Automatic Updates 8

Same name and namespace in other branches

1. 7 vendor/paragonie/sodium_compat/src/Compat.php \ParagonIE_Sodium_Compat::crypto_kdf_derive_from_key()

Parameters

int $subkey_len:

int $subkey_id:

string $context:

string $key:

Return value

string

Throws

SodiumException

1 call to ParagonIE_Sodium_Compat::crypto_kdf_derive_from_key()

php72compat.php in vendor/paragonie/sodium_compat/lib/php72compat.php

File

vendor/paragonie/sodium_compat/src/Compat.php, line 1616

Class

ParagonIE_Sodium_Compat

Code

public static function crypto_kdf_derive_from_key($subkey_len, $subkey_id, $context, $key) {
  ParagonIE_Sodium_Core_Util::declareScalarType($subkey_len, 'int', 1);
  ParagonIE_Sodium_Core_Util::declareScalarType($subkey_id, 'int', 2);
  ParagonIE_Sodium_Core_Util::declareScalarType($context, 'string', 3);
  ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
  $subkey_id = (int) $subkey_id;
  $subkey_len = (int) $subkey_len;
  $context = (string) $context;
  $key = (string) $key;
  if ($subkey_len < self::CRYPTO_KDF_BYTES_MIN) {
    throw new SodiumException('subkey cannot be smaller than SODIUM_CRYPTO_KDF_BYTES_MIN');
  }
  if ($subkey_len > self::CRYPTO_KDF_BYTES_MAX) {
    throw new SodiumException('subkey cannot be larger than SODIUM_CRYPTO_KDF_BYTES_MAX');
  }
  if ($subkey_id < 0) {
    throw new SodiumException('subkey_id cannot be negative');
  }
  if (ParagonIE_Sodium_Core_Util::strlen($context) !== self::CRYPTO_KDF_CONTEXTBYTES) {
    throw new SodiumException('context should be SODIUM_CRYPTO_KDF_CONTEXTBYTES bytes');
  }
  if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_KDF_KEYBYTES) {
    throw new SodiumException('key should be SODIUM_CRYPTO_KDF_KEYBYTES bytes');
  }
  $salt = ParagonIE_Sodium_Core_Util::store64_le($subkey_id);
  $state = self::crypto_generichash_init_salt_personal($key, $subkey_len, $salt, $context);
  return self::crypto_generichash_final($state, $subkey_len);
}