-bool rsa_private_decrypt(rsa_t *rsa, const void *in, size_t len, void *out) {
- gcry_mpi_t inmpi;
- check(gcry_mpi_scan(&inmpi, GCRYMPI_FMT_USG, in, len, NULL));
-
- gcry_mpi_t outmpi = gcry_mpi_new(len * 8);
- gcry_mpi_powm(outmpi, inmpi, rsa->d, rsa->n);
-
- size_t pad = len - (gcry_mpi_get_nbits(outmpi) + 7) / 8;
- unsigned char *pout = out;