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   1  <?php
   2  namespace Lcobucci\JWT\Signer\Ecdsa;
   3  
   4  /**
   5   * Manipulates the result of a ECDSA signature (points R and S) according to the
   6   * JWA specs.
   7   *
   8   * OpenSSL creates a signature using the ASN.1 format and, according the JWA specs,
   9   * the signature for JWTs must be the concatenated values of points R and S (in
  10   * big-endian octet order).
  11   *
  12   * @internal
  13   *
  14   * @see https://tools.ietf.org/html/rfc7518#page-9
  15   * @see https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One
  16   */
  17  interface SignatureConverter
  18  {
  19      /**
  20       * Converts the signature generated by OpenSSL into what JWA defines
  21       *
  22       * @param string $signature
  23       * @param int $length
  24       *
  25       * @return string
  26       */
  27      public function fromAsn1($signature, $length);
  28  
  29      /**
  30       * Converts the JWA signature into something OpenSSL understands
  31       *
  32       * @param string $points
  33       * @param int $length
  34       *
  35       * @return string
  36       */
  37      public function toAsn1($points, $length);
  38  }