HASH_FLAG_UPDATE
if (req_ctx->hash_flags & HASH_FLAG_UPDATE) {
req_ctx->hash_flags &= ~(HASH_FLAG_UPDATE);
req_ctx->hash_flags &= ~(HASH_FLAG_INIT_CTX | HASH_FLAG_UPDATE |
req_ctx->hash_flags |= HASH_FLAG_UPDATE;
req_ctx->hash_flags |= HASH_FLAG_UPDATE | HASH_FLAG_FINALIZE;
req_ctx->hash_flags |= HASH_FLAG_UPDATE | HASH_FLAG_FINALIZE;
req_ctx->hash_flags |= HASH_FLAG_UPDATE | HASH_FLAG_FINALIZE;