Function sha256_uchars

src/simplicity/sha256.h:223–240

Add an array of bytes to be consumed by an ongoing SHA-256 evaluation. * Returns false if the counter overflows. * * Precondition: NULL != ctx; * if 0 < len then unsigned char arr[len]; */

 *               if 0 < len then unsigned char arr[len];
 */
static inline bool sha256_uchars(sha256_context* ctx, const unsigned char* arr, size_t len) {
  size_t delta = 64 - ctx->counter % 64;
  unsigned char *block = ctx->block + ctx->counter % 64;
  ctx->overflow = ctx->overflow || sha256_max_counter - ctx->counter <= len;
  ctx->counter += len;

  while (delta <= len) {
    memcpy(block, arr, delta);
    arr += delta;
    len -= delta;
    sha256_compression_uchar(ctx->output, ctx->block);
    block = ctx->block;
    delta = 64;
  }

  if (len) memcpy(block, arr, len);
  return !ctx->overflow;
}

/* Add one byte to be consumed by an ongoing SHA-256 evaluation.
 *