Function simplicity_make_tapleaf

src/simplicity/elements/ops.c:133–151

Compute an Element's tapleaf hash from a tapleaf version and a 256-bit script value. * A reimplementation of ComputeTapleafHash from Element's 'interpreter.cpp'. * Only 256-bit script values are supported as that is the size used for Simplicity CMRs. * * Precondition: NULL != cmr; */

 * Precondition: NULL != cmr;
 */
sha256_midstate simplicity_make_tapleaf(unsigned char version, const sha256_midstate* cmr) {
  sha256_midstate result;
  sha256_midstate tapleafTag;
  {
    static unsigned char tagName[] = "TapLeaf/elements";
    sha256_context ctx = sha256_init(tapleafTag.s);
    sha256_uchars(&ctx, tagName, sizeof(tagName) - 1);
    sha256_finalize(&ctx);
  }
  sha256_context ctx = sha256_init(result.s);
  sha256_hash(&ctx, &tapleafTag);
  sha256_hash(&ctx, &tapleafTag);
  sha256_uchar(&ctx, version);
  sha256_uchar(&ctx, 32);
  sha256_hash(&ctx, cmr);
  sha256_finalize(&ctx);

  return result;
}

/* Compute an Element's tapbrach hash from two branches.
 *